Moved general purpose stuff into util, renamed utils->util

src/mightypork/util/math/Calc.java

@@ -0,0 +1,934 @@
+package mightypork.util.math;
+
+
+import java.nio.FloatBuffer;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+import mightypork.util.math.constraints.vect.Vect;
+
+import org.lwjgl.BufferUtils;
+
+
+/**
+ * Math helper
+ * 
+ * @author MightyPork
+ */
+public class Calc {
+	
+	/** Square root of two */
+	public static final double SQ2 = 1.41421356237;
+	
+	
+	/**
+	 * Get distance from 2D line to 2D point [X,Y]
+	 * 
+	 * @param lineDirVec line directional vector
+	 * @param linePoint point of line
+	 * @param point point coordinate
+	 * @return distance
+	 */
+	public static double linePointDist(Vect lineDirVec, Vect linePoint, Vect point)
+	{
+		// line point L[lx,ly]
+		final double lx = linePoint.x();
+		final double ly = linePoint.y();
+		
+		// line equation ax+by+c=0
+		final double a = -lineDirVec.y();
+		final double b = lineDirVec.x();
+		final double c = -a * lx - b * ly;
+		
+		// checked point P[x,y]
+		final double x = point.x();
+		final double y = point.y();
+		
+		// distance
+		return Math.abs(a * x + b * y + c) / Math.sqrt(a * a + b * b);
+	}
+	
+	
+	/**
+	 * Get longest side of a right-angled triangle
+	 * 
+	 * @param a side a (opposite)
+	 * @param b side b (adjacent)
+	 * @return longest side (hypotenuse)
+	 */
+	public static double pythC(double a, double b)
+	{
+		return Math.sqrt(square(a) + square(b));
+	}
+	
+	
+	/**
+	 * Get adjacent side of a right-angled triangle
+	 * 
+	 * @param a side a (opposite)
+	 * @param c side c (hypotenuse)
+	 * @return side b (adjacent)
+	 */
+	public static double pythB(double a, double c)
+	{
+		return Math.sqrt(square(c) - square(a));
+	}
+	
+	
+	/**
+	 * Get opposite side of a right-angled triangle
+	 * 
+	 * @param b side b (adjacent)
+	 * @param c side c (hypotenuse)
+	 * @return side a (opposite)
+	 */
+	public static double pythA(double b, double c)
+	{
+		return Math.sqrt(square(c) - square(b));
+	}
+	
+	private static class Angles {
+		
+		public static double delta(double alpha, double beta, double a360)
+		{
+			while (Math.abs(alpha - beta) > a360 / 2D) {
+				alpha = norm(alpha + a360 / 2D, a360);
+				beta = norm(beta + a360 / 2D, a360);
+			}
+			
+			return beta - alpha;
+		}
+		
+		
+		public static double norm(double angle, double a360)
+		{
+			while (angle < 0)
+				angle += a360;
+			while (angle > a360)
+				angle -= a360;
+			return angle;
+		}
+	}
+	
+	/**
+	 * Calc subclass with buffer utils.
+	 * 
+	 * @author MightyPork
+	 */
+	public static class Buffers {
+		
+		/**
+		 * Create java.nio.FloatBuffer of given floats, and flip it.
+		 * 
+		 * @param obj floats or float array
+		 * @return float buffer
+		 */
+		public static FloatBuffer mkFillBuff(float... obj)
+		{
+			return (FloatBuffer) BufferUtils.createFloatBuffer(obj.length).put(obj).flip();
+		}
+		
+		
+		/**
+		 * Fill java.nio.FloatBuffer with floats or float array
+		 * 
+		 * @param buff
+		 * @param obj
+		 */
+		public static void fill(FloatBuffer buff, float... obj)
+		{
+			buff.put(obj);
+			buff.flip();
+		}
+		
+		
+		/**
+		 * Create new java.nio.FloatBuffer of given length
+		 * 
+		 * @param count elements
+		 * @return the new java.nio.FloatBuffer
+		 */
+		public static FloatBuffer alloc(int count)
+		{
+			return BufferUtils.createFloatBuffer(count);
+		}
+		
+	}
+	
+	/**
+	 * Angle calculations for degrees.
+	 * 
+	 * @author MightyPork
+	 */
+	public static class Deg {
+		
+		/** 180° in degrees */
+		public static final double a180 = 180;
+		/** 270° in degrees */
+		public static final double a270 = 270;
+		/** 360° in degrees */
+		public static final double a360 = 360;
+		/** 45° in degrees */
+		public static final double a45 = 45;
+		/** 90° in degrees */
+		public static final double a90 = 90;
+		
+		
+		/**
+		 * Subtract two angles alpha - beta
+		 * 
+		 * @param alpha first angle
+		 * @param beta second angle
+		 * @return (alpha - beta) in degrees
+		 */
+		public static double delta(double alpha, double beta)
+		{
+			return Angles.delta(alpha, beta, a360);
+		}
+		
+		
+		/**
+		 * Difference of two angles (absolute value of delta)
+		 * 
+		 * @param alpha first angle
+		 * @param beta second angle
+		 * @return difference in radians
+		 */
+		public static double diff(double alpha, double beta)
+		{
+			return Math.abs(Angles.delta(alpha, beta, a360));
+		}
+		
+		
+		/**
+		 * Cosinus in degrees
+		 * 
+		 * @param deg angle in degrees
+		 * @return cosinus
+		 */
+		public static double cos(double deg)
+		{
+			return Math.cos(toRad(deg));
+		}
+		
+		
+		/**
+		 * Sinus in degrees
+		 * 
+		 * @param deg angle in degrees
+		 * @return sinus
+		 */
+		public static double sin(double deg)
+		{
+			return Math.sin(toRad(deg));
+		}
+		
+		
+		/**
+		 * Tangents in degrees
+		 * 
+		 * @param deg angle in degrees
+		 * @return tangents
+		 */
+		public static double tan(double deg)
+		{
+			return Math.tan(toRad(deg));
+		}
+		
+		
+		/**
+		 * Angle normalized to 0-360 range
+		 * 
+		 * @param angle angle to normalize
+		 * @return normalized angle
+		 */
+		public static double norm(double angle)
+		{
+			return Angles.norm(angle, a360);
+		}
+		
+		
+		/**
+		 * Convert to radians
+		 * 
+		 * @param deg degrees
+		 * @return radians
+		 */
+		public static double toRad(double deg)
+		{
+			return Math.toRadians(deg);
+		}
+		
+		
+		/**
+		 * Round angle to 0,45,90,135...
+		 * 
+		 * @param deg angle in deg. to round
+		 * @param x rounding increment (45 - round to 0,45,90...)
+		 * @return rounded
+		 */
+		public static int roundX(double deg, double x)
+		{
+			final double half = x / 2d;
+			deg += half;
+			deg = norm(deg);
+			final int times = (int) Math.floor(deg / x);
+			double a = times * x;
+			if (a == 360) a = 0;
+			return (int) Math.round(a);
+		}
+		
+		
+		/**
+		 * Round angle to 0,45,90,135...
+		 * 
+		 * @param deg angle in deg. to round
+		 * @return rounded
+		 */
+		public static int round45(double deg)
+		{
+			return roundX(deg, 45);
+		}
+		
+		
+		/**
+		 * Round angle to 0,90,180,270
+		 * 
+		 * @param deg angle in deg. to round
+		 * @return rounded
+		 */
+		public static int round90(double deg)
+		{
+			return roundX(deg, 90);
+		}
+		
+		
+		/**
+		 * Round angle to 0,15,30,45,60,75,90...
+		 * 
+		 * @param deg angle in deg to round
+		 * @return rounded
+		 */
+		public static int round15(double deg)
+		{
+			return roundX(deg, 15);
+		}
+	}
+	
+	/**
+	 * Angle calculations for radians.
+	 * 
+	 * @author MightyPork
+	 */
+	public static class Rad {
+		
+		/** 180° in radians */
+		public static final double a180 = Math.PI;
+		/** 270° in radians */
+		public static final double a270 = Math.PI * 1.5D;
+		/** 360° in radians */
+		public static final double a360 = Math.PI * 2D;
+		/** 45° in radians */
+		public static final double a45 = Math.PI / 4D;
+		/** 90° in radians */
+		public static final double a90 = Math.PI / 2D;
+		
+		
+		/**
+		 * Subtract two angles alpha - beta
+		 * 
+		 * @param alpha first angle
+		 * @param beta second angle
+		 * @return (alpha - beta) in radians
+		 */
+		public static double delta(double alpha, double beta)
+		{
+			return Angles.delta(alpha, beta, a360);
+		}
+		
+		
+		/**
+		 * Difference of two angles (absolute value of delta)
+		 * 
+		 * @param alpha first angle
+		 * @param beta second angle
+		 * @return difference in radians
+		 */
+		public static double diff(double alpha, double beta)
+		{
+			return Math.abs(Angles.delta(alpha, beta, a360));
+		}
+		
+		
+		/**
+		 * Cos
+		 * 
+		 * @param rad angle in rads
+		 * @return cos
+		 */
+		public static double cos(double rad)
+		{
+			return Math.cos(rad);
+		}
+		
+		
+		/**
+		 * Sin
+		 * 
+		 * @param rad angle in rads
+		 * @return sin
+		 */
+		public static double sin(double rad)
+		{
+			return Math.sin(rad);
+		}
+		
+		
+		/**
+		 * Tan
+		 * 
+		 * @param rad angle in rads
+		 * @return tan
+		 */
+		public static double tan(double rad)
+		{
+			return Math.tan(rad);
+		}
+		
+		
+		/**
+		 * Angle normalized to 0-2*PI range
+		 * 
+		 * @param angle angle to normalize
+		 * @return normalized angle
+		 */
+		public static double norm(double angle)
+		{
+			return Angles.norm(angle, a360);
+		}
+		
+		
+		/**
+		 * Convert to degrees
+		 * 
+		 * @param rad radians
+		 * @return degrees
+		 */
+		public static double toDeg(double rad)
+		{
+			return Math.toDegrees(rad);
+		}
+	}
+	
+	private static Random rand = new Random();
+	
+	
+	/**
+	 * Get volume of a sphere
+	 * 
+	 * @param radius sphere radius
+	 * @return volume in cubic units
+	 */
+	public static double sphereGetVolume(double radius)
+	{
+		return (4D / 3D) * Math.PI * cube(radius);
+	}
+	
+	
+	/**
+	 * Get radius of a sphere
+	 * 
+	 * @param volume sphere volume
+	 * @return radius in units
+	 */
+	public static double sphereGetRadius(double volume)
+	{
+		return Math.cbrt((3D * volume) / (4 * Math.PI));
+	}
+	
+	
+	/**
+	 * Get surface of a circle
+	 * 
+	 * @param radius circle radius
+	 * @return volume in square units
+	 */
+	public static double circleGetSurface(double radius)
+	{
+		return Math.PI * square(radius);
+	}
+	
+	
+	/**
+	 * Get radius of a circle
+	 * 
+	 * @param surface circle volume
+	 * @return radius in units
+	 */
+	public static double circleGetRadius(double surface)
+	{
+		return Math.sqrt(surface / Math.PI);
+	}
+	
+	
+	/**
+	 * Check if objects are equal (for equals function)
+	 * 
+	 * @param a
+	 * @param b
+	 * @return are equal
+	 */
+	public static boolean areObjectsEqual(Object a, Object b)
+	{
+		return a == null ? b == null : a.equals(b);
+	}
+	
+	
+	/**
+	 * Private clamping helper.
+	 * 
+	 * @param number number to be clamped
+	 * @param min min value
+	 * @param max max value
+	 * @return clamped double
+	 */
+	private static double clamp_double(Number number, Number min, Number max)
+	{
+		double n = number.doubleValue();
+		final double mind = min.doubleValue();
+		final double maxd = max.doubleValue();
+		if (n > maxd) n = maxd;
+		if (n < mind) n = mind;
+		if (Double.isNaN(n)) return mind;
+		return n;
+	}
+	
+	
+	/**
+	 * Private clamping helper.
+	 * 
+	 * @param number number to be clamped
+	 * @param min min value
+	 * @return clamped double
+	 */
+	private static double clamp_double(Number number, Number min)
+	{
+		double n = number.doubleValue();
+		final double mind = min.doubleValue();
+		if (n < mind) n = mind;
+		return n;
+	}
+	
+	
+	/**
+	 * Clamp number to min and max bounds, inclusive.<br>
+	 * DOUBLE version
+	 * 
+	 * @param number clamped number
+	 * @param min minimal allowed value
+	 * @param max maximal allowed value
+	 * @return result
+	 */
+	public static double clampd(Number number, Number min, Number max)
+	{
+		return clamp_double(number, min, max);
+	}
+	
+	
+	/**
+	 * Clamp number to min and max bounds, inclusive.<br>
+	 * FLOAT version
+	 * 
+	 * @param number clamped number
+	 * @param min minimal allowed value
+	 * @param max maximal allowed value
+	 * @return result
+	 */
+	public static float clampf(Number number, Number min, Number max)
+	{
+		return (float) clamp_double(number, min, max);
+	}
+	
+	
+	/**
+	 * Clamp number to min and max bounds, inclusive.<br>
+	 * INTEGER version
+	 * 
+	 * @param number clamped number
+	 * @param min minimal allowed value
+	 * @param max maximal allowed value
+	 * @return result
+	 */
+	public static int clampi(Number number, Number min, Number max)
+	{
+		return (int) Math.round(clamp_double(number, min, max));
+	}
+	
+	
+	/**
+	 * Clamp number to min and max bounds, inclusive.<br>
+	 * INTEGER version
+	 * 
+	 * @param number clamped number
+	 * @param range range
+	 * @return result
+	 */
+	public static int clampi(Number number, Range range)
+	{
+		return (int) Math.round(clamp_double(number, range.getMin(), range.getMax()));
+	}
+	
+	
+	/**
+	 * Clamp number to min and max bounds, inclusive.<br>
+	 * DOUBLE version
+	 * 
+	 * @param number clamped number
+	 * @param range range
+	 * @return result
+	 */
+	public static double clampd(Number number, Range range)
+	{
+		return clamp_double(number, range.getMin(), range.getMax());
+	}
+	
+	
+	/**
+	 * Clamp number to min and max bounds, inclusive.<br>
+	 * FLOAT version
+	 * 
+	 * @param number clamped number
+	 * @param range range
+	 * @return result
+	 */
+	public static float clampf(Number number, Range range)
+	{
+		return (float) clamp_double(number, range.getMin(), range.getMax());
+	}
+	
+	
+	/**
+	 * Clamp number to min and infinite bounds, inclusive.<br>
+	 * DOUBLE version
+	 * 
+	 * @param number clamped number
+	 * @param min minimal allowed value
+	 * @return result
+	 */
+	public static double clampd(Number number, Number min)
+	{
+		return clamp_double(number, min);
+	}
+	
+	
+	/**
+	 * Clamp number to min and infinite bounds, inclusive.<br>
+	 * FLOAT version
+	 * 
+	 * @param number clamped number
+	 * @param min minimal allowed value
+	 * @return result
+	 */
+	public static float clampf(Number number, Number min)
+	{
+		return (float) clamp_double(number, min);
+	}
+	
+	
+	/**
+	 * Clamp number to min and infinite bounds, inclusive.<br>
+	 * INTEGER version
+	 * 
+	 * @param number clamped number
+	 * @param min minimal allowed value
+	 * @return result
+	 */
+	public static int clampi(Number number, Number min)
+	{
+		return (int) Math.round(clamp_double(number, min));
+	}
+	
+	
+	/**
+	 * Get class simple name
+	 * 
+	 * @param obj object
+	 * @return simple name
+	 */
+	public static String cname(Object obj)
+	{
+		if (obj == null) return "NULL";
+		return obj.getClass().getSimpleName();
+	}
+	
+	
+	/**
+	 * Cube a double
+	 * 
+	 * @param a squared double
+	 * @return square
+	 */
+	public static double cube(double a)
+	{
+		return a * a * a;
+	}
+	
+	
+	/**
+	 * Convert double to string, remove the mess at the end.
+	 * 
+	 * @param d double
+	 * @return string
+	 */
+	public static String toString(double d)
+	{
+		String s = Double.toString(d);
+		s = s.replace(',', '.');
+		s = s.replaceAll("([0-9]+\\.[0-9]+)00+[0-9]+", "$1");
+		s = s.replaceAll("0+$", "");
+		s = s.replaceAll("\\.$", "");
+		return s;
+	}
+	
+	
+	/**
+	 * Convert float to string, remove the mess at the end.
+	 * 
+	 * @param f float
+	 * @return string
+	 */
+	public static String toString(float f)
+	{
+		String s = Float.toString(f);
+		s = s.replaceAll("([0-9]+\\.[0-9]+)00+[0-9]+", "$1");
+		s = s.replaceAll("0+$", "");
+		s = s.replaceAll("\\.$", "");
+		return s;
+	}
+	
+	
+	/**
+	 * Check if number is in range
+	 * 
+	 * @param number checked
+	 * @param left lower end
+	 * @param right upper end
+	 * @return is in range
+	 */
+	public static boolean inRange(double number, double left, double right)
+	{
+		return number >= left && number <= right;
+	}
+	
+	
+	/**
+	 * Get number from A to B at delta time (tween A to B)
+	 * 
+	 * @param from last number
+	 * @param to new number
+	 * @param time time 0..1
+	 * @param easing easing function
+	 * @return current number to render
+	 */
+	public static double interpolate(double from, double to, double time, Easing easing)
+	{
+		return from + (to - from) * easing.get(time);
+	}
+	
+	
+	/**
+	 * Get angle [degrees] from A to B at delta time (tween A to B)
+	 * 
+	 * @param from last angle
+	 * @param to new angle
+	 * @param time time 0..1
+	 * @param easing easing function
+	 * @return current angle to render
+	 */
+	public static double interpolateDeg(double from, double to, double time, Easing easing)
+	{
+		return Deg.norm(from - Deg.delta(to, from) * easing.get(time));
+	}
+	
+	
+	/**
+	 * Get angle [radians] from A to B at delta time (tween A to B)
+	 * 
+	 * @param from last angle
+	 * @param to new angle
+	 * @param time time 0..1
+	 * @param easing easing function
+	 * @return current angle to render
+	 */
+	public static double interpolateRad(double from, double to, double time, Easing easing)
+	{
+		return Rad.norm(from - Rad.delta(to, from) * easing.get(time));
+	}
+	
+	
+	/**
+	 * Get highest number of a list
+	 * 
+	 * @param numbers numbers
+	 * @return lowest
+	 */
+	public static double max(double... numbers)
+	{
+		double highest = numbers[0];
+		for (final double num : numbers) {
+			if (num > highest) highest = num;
+		}
+		return highest;
+	}
+	
+	
+	/**
+	 * Get highest number of a list
+	 * 
+	 * @param numbers numbers
+	 * @return lowest
+	 */
+	public static float max(float... numbers)
+	{
+		float highest = numbers[0];
+		for (final float num : numbers) {
+			if (num > highest) highest = num;
+		}
+		return highest;
+	}
+	
+	
+	/**
+	 * Get highest number of a list
+	 * 
+	 * @param numbers numbers
+	 * @return lowest
+	 */
+	public static int max(int... numbers)
+	{
+		int highest = numbers[0];
+		for (final int num : numbers) {
+			if (num > highest) highest = num;
+		}
+		return highest;
+	}
+	
+	
+	/**
+	 * Get lowest number of a list
+	 * 
+	 * @param numbers numbers
+	 * @return lowest
+	 */
+	public static double min(double... numbers)
+	{
+		double lowest = numbers[0];
+		for (final double num : numbers) {
+			if (num < lowest) lowest = num;
+		}
+		return lowest;
+	}
+	
+	
+	/**
+	 * Get lowest number of a list
+	 * 
+	 * @param numbers numbers
+	 * @return lowest
+	 */
+	public static float min(float... numbers)
+	{
+		float lowest = numbers[0];
+		for (final float num : numbers) {
+			if (num < lowest) lowest = num;
+		}
+		return lowest;
+	}
+	
+	
+	/**
+	 * Get lowest number of a list
+	 * 
+	 * @param numbers numbers
+	 * @return lowest
+	 */
+	public static int min(int... numbers)
+	{
+		int lowest = numbers[0];
+		for (final int num : numbers) {
+			if (num < lowest) lowest = num;
+		}
+		return lowest;
+	}
+	
+	
+	/**
+	 * Split comma separated list of integers.
+	 * 
+	 * @param list String containing the list.
+	 * @return array of integers or null.
+	 */
+	public static List<Integer> parseIntList(String list)
+	{
+		if (list == null) {
+			return null;
+		}
+		final String[] parts = list.split(",");
+		
+		final ArrayList<Integer> intList = new ArrayList<>();
+		
+		for (final String part : parts) {
+			try {
+				intList.add(Integer.parseInt(part));
+			} catch (final NumberFormatException e) {}
+		}
+		
+		return intList;
+		
+	}
+	
+	
+	/**
+	 * Pick random element from a given list.
+	 * 
+	 * @param list list of choices
+	 * @return picked element
+	 */
+	public static Object pick(List<?> list)
+	{
+		if (list.size() == 0) return null;
+		return list.get(rand.nextInt(list.size()));
+	}
+	
+	
+	/**
+	 * Square a double
+	 * 
+	 * @param a squared double
+	 * @return square
+	 */
+	public static double square(double a)
+	{
+		return a * a;
+	}
+	
+	
+	/**
+	 * Signum.
+	 * 
+	 * @param number
+	 * @return sign, -1,0,1
+	 */
+	public static int sgn(double number)
+	{
+		return number > 0 ? 1 : number < 0 ? -1 : 0;
+	}
+	
+	
+	public static double frag(double d)
+	{
+		return d - Math.floor(d);
+	}
+	
+}

src/mightypork/util/math/Easing.java

@@ -0,0 +1,317 @@
+package mightypork.util.math;
+
+
+import mightypork.util.annotations.FactoryMethod;
+
+
+/**
+ * EasingFunction function.
+ * 
+ * @author MightyPork
+ */
+public abstract class Easing {
+	
+	/**
+	 * Get value at time t.
+	 * 
+	 * @param t time parameter (t = 1..1)
+	 * @return value at given t (0..1, can exceed if needed)
+	 */
+	public abstract double get(double t);
+	
+	
+	/**
+	 * Reverse an easing
+	 * 
+	 * @param original original easing
+	 * @return reversed easing
+	 */
+	@FactoryMethod
+	public static Easing reverse(Easing original)
+	{
+		return new Reverse(original);
+	}
+	
+	
+	/**
+	 * Combine two easings
+	 * 
+	 * @param in initial easing
+	 * @param out terminal easing
+	 * @return product
+	 */
+	@FactoryMethod
+	public static Easing combine(Easing in, Easing out)
+	{
+		return new Composite(in, out);
+	}
+	
+	
+	/**
+	 * Create "bilinear" easing - compose of straight and reverse.
+	 * 
+	 * @param in initial easing
+	 * @return product
+	 */
+	@FactoryMethod
+	public static Easing inOut(Easing in)
+	{
+		return combine(in, reverse(in));
+	}
+	
+	/**
+	 * Reverse EasingFunction
+	 * 
+	 * @author MightyPork
+	 */
+	private static class Reverse extends Easing {
+		
+		private final Easing ea;
+		
+		
+		/**
+		 * @param in Easing to reverse
+		 */
+		public Reverse(Easing in) {
+			this.ea = in;
+		}
+		
+		
+		@Override
+		public double get(double t)
+		{
+			return 1 - ea.get(1 - t);
+		}
+	}
+	
+	/**
+	 * Composite EasingFunction (0-0.5 EasingFunction A, 0.5-1 EasingFunction B)
+	 * 
+	 * @author MightyPork
+	 */
+	private static class Composite extends Easing {
+		
+		private final Easing in;
+		private final Easing out;
+		
+		
+		/**
+		 * Create a composite EasingFunction
+		 * 
+		 * @param in initial EasingFunction
+		 * @param out terminal EasingFunction
+		 */
+		public Composite(Easing in, Easing out) {
+			this.in = in;
+			this.out = out;
+		}
+		
+		
+		@Override
+		public double get(double t)
+		{
+			if (t < 0.5) return in.get(2 * t) * 0.5;
+			return 0.5 + out.get(2 * t - 1) * 0.5;
+		}
+	}
+	
+	/** No easing; At t=0.5 goes high. */
+	public static final Easing NONE = new Easing() {
+		
+		@Override
+		public double get(double t)
+		{
+			return (t < 0.5 ? 0 : 1);
+		}
+	};
+	
+	/** Linear (y=t) easing */
+	public static final Easing LINEAR = new Easing() {
+		
+		@Override
+		public double get(double t)
+		{
+			return t;
+		}
+	};
+	
+	/** Quadratic (y=t^2) easing in */
+	public static final Easing QUADRATIC_IN = new Easing() {
+		
+		@Override
+		public double get(double t)
+		{
+			return t * t;
+		}
+	};
+	
+	/** Quadratic (y=t^2) easing out */
+	public static final Easing QUADRATIC_OUT = reverse(QUADRATIC_IN);
+	
+	/** Quadratic (y=t^2) easing both */
+	public static final Easing QUADRATIC_BOTH = inOut(QUADRATIC_IN);
+	
+	/** Cubic (y=t^3) easing in */
+	public static final Easing CUBIC_IN = new Easing() {
+		
+		@Override
+		public double get(double t)
+		{
+			return t * t * t;
+		}
+	};
+	
+	/** Cubic (y=t^3) easing out */
+	public static final Easing CUBIC_OUT = reverse(CUBIC_IN);
+	
+	/** Cubic (y=t^3) easing both */
+	public static final Easing CUBIC_BOTH = inOut(CUBIC_IN);
+	
+	/** Quartic (y=t^4) easing in */
+	public static final Easing QUARTIC_IN = new Easing() {
+		
+		@Override
+		public double get(double t)
+		{
+			return t * t * t * t;
+		}
+	};
+	
+	/** Quartic (y=t^4) easing out */
+	public static final Easing QUARTIC_OUT = reverse(QUADRATIC_IN);
+	
+	/** Quartic (y=t^4) easing both */
+	public static final Easing QUARTIC_BOTH = inOut(QUADRATIC_IN);
+	
+	/** Quintic (y=t^5) easing in */
+	public static final Easing QUINTIC_IN = new Easing() {
+		
+		@Override
+		public double get(double t)
+		{
+			return t * t * t * t * t;
+		}
+	};
+	
+	/** Quintic (y=t^5) easing out */
+	public static final Easing QUINTIC_OUT = reverse(QUINTIC_IN);
+	
+	/** Quintic (y=t^5) easing both */
+	public static final Easing QUINTIC_BOTH = inOut(QUINTIC_IN);
+	
+	/** Sine easing in */
+	public static final Easing SINE_IN = new Easing() {
+		
+		@Override
+		public double get(double t)
+		{
+			return 1 - Math.cos(t * (Math.PI / 2));
+		}
+	};
+	
+	/** Sine easing out */
+	public static final Easing SINE_OUT = reverse(SINE_IN);
+	
+	/** Sine easing both */
+	public static final Easing SINE_BOTH = inOut(SINE_IN);
+	
+	/** Exponential easing in */
+	public static final Easing EXPO_IN = new Easing() {
+		
+		@Override
+		public double get(double t)
+		{
+			return Math.pow(2, 10 * (t - 1));
+		}
+	};
+	
+	/** Exponential easing out */
+	public static final Easing EXPO_OUT = reverse(EXPO_IN);
+	
+	/** Exponential easing both */
+	public static final Easing EXPO_BOTH = inOut(EXPO_IN);
+	
+	/** Circular easing in */
+	public static final Easing CIRC_IN = new Easing() {
+		
+		@Override
+		public double get(double t)
+		{
+			return 1 - Math.sqrt(1 - t * t);
+		}
+	};
+	
+	/** Circular easing out */
+	public static final Easing CIRC_OUT = reverse(CIRC_IN);
+	
+	/** Circular easing both */
+	public static final Easing CIRC_BOTH = inOut(CIRC_IN);
+	
+	/** Bounce easing in */
+	public static final Easing BOUNCE_OUT = new Easing() {
+		
+		@Override
+		public double get(double t)
+		{
+			if (t < (1 / 2.75f)) {
+				return (7.5625f * t * t);
+				
+			} else if (t < (2 / 2.75f)) {
+				t -= (1.5f / 2.75f);
+				return (7.5625f * t * t + 0.75f);
+				
+			} else if (t < (2.5 / 2.75)) {
+				t -= (2.25f / 2.75f);
+				return (7.5625f * t * t + 0.9375f);
+				
+			} else {
+				t -= (2.625f / 2.75f);
+				return (7.5625f * t * t + 0.984375f);
+			}
+		}
+	};
+	
+	/** Bounce easing out */
+	public static final Easing BOUNCE_IN = reverse(BOUNCE_OUT);
+	
+	/** Bounce easing both */
+	public static final Easing BOUNCE_BOTH = inOut(BOUNCE_IN);
+	
+	/** Back easing in */
+	public static final Easing BACK_IN = new Easing() {
+		
+		@Override
+		public double get(double t)
+		{
+			final float s = 1.70158f;
+			return t * t * ((s + 1) * t - s);
+		}
+	};
+	
+	/** Back easing out */
+	public static final Easing BACK_OUT = reverse(BACK_IN);
+	
+	/** Back easing both */
+	public static final Easing BACK_BOTH = inOut(BACK_IN);
+	
+	/** Elastic easing in */
+	public static final Easing ELASTIC_IN = new Easing() {
+		
+		@Override
+		public double get(double t)
+		{
+			if (t == 0) return 0;
+			if (t == 1) return 1;
+			
+			final double p = .3f;
+			final double s = p / 4;
+			return -(Math.pow(2, 10 * (t -= 1)) * Math.sin((t - s) * (2 * Math.PI) / p));
+		}
+	};
+	
+	/** Elastic easing out */
+	public static final Easing ELASTIC_OUT = reverse(ELASTIC_IN);
+	
+	/** Elastic easing both */
+	public static final Easing ELASTIC_BOTH = inOut(ELASTIC_IN);
+}

src/mightypork/util/math/Polar.java

@@ -0,0 +1,190 @@
+package mightypork.util.math;
+
+
+import mightypork.util.math.constraints.vect.Vect;
+
+
+/**
+ * Polar coordinate
+ * 
+ * @author MightyPork
+ */
+public class Polar {
+	
+	/** angle in radians */
+	private double angle = 0;
+	
+	/** distance in units */
+	private double radius = 0;
+	
+	private Vect coord = null;
+	
+	
+	/**
+	 * Create a polar
+	 * 
+	 * @param angle angle in RAD
+	 * @param distance distance from origin
+	 */
+	public Polar(double angle, double distance) {
+		this(angle, false, distance);
+	}
+	
+	
+	/**
+	 * Create a polar
+	 * 
+	 * @param angle angle
+	 * @param deg angle is in DEG
+	 * @param distance radius
+	 */
+	public Polar(double angle, boolean deg, double distance) {
+		this.radius = distance;
+		this.angle = deg ? Math.toRadians(angle) : angle;
+	}
+	
+	
+	/**
+	 * @return angle in RAD
+	 */
+	public double getAngle()
+	{
+		return angle;
+	}
+	
+	
+	/**
+	 * @return angle in DEG
+	 */
+	public double getAngleDeg()
+	{
+		return Math.toDegrees(angle);
+	}
+	
+	
+	/**
+	 * @param angle angle in RAD
+	 */
+	public void setAngle(double angle)
+	{
+		this.angle = angle;
+	}
+	
+	
+	/**
+	 * @param angle angle in DEG
+	 */
+	public void setAngleDeg(double angle)
+	{
+		this.angle = Math.toRadians(angle);
+	}
+	
+	
+	/**
+	 * @return radius
+	 */
+	public double getRadius()
+	{
+		return radius;
+	}
+	
+	
+	/**
+	 * @param r radius
+	 */
+	public void setRadius(double r)
+	{
+		this.radius = r;
+	}
+	
+	
+	/**
+	 * Make polar from coord
+	 * 
+	 * @param coord coord
+	 * @return polar
+	 */
+	public static Polar fromCoord(Vect coord)
+	{
+		return Polar.fromCoord(coord.x(), coord.y());
+		
+	}
+	
+	
+	/**
+	 * Make polar from coords
+	 * 
+	 * @param x x coord
+	 * @param y y coord
+	 * @return polar
+	 */
+	public static Polar fromCoord(double x, double y)
+	{
+		final double a = Math.atan2(y, x);
+		final double r = Math.sqrt(x * x + y * y);
+		
+		return new Polar(a, r);
+	}
+	
+	
+	/**
+	 * Get coord from polar
+	 * 
+	 * @return coord
+	 */
+	public Vect toCoord()
+	{
+		// lazy init
+		if (coord == null) coord = new Vect() {
+			
+			@Override
+			public double x()
+			{
+				return radius * Math.cos(angle);
+			}
+			
+			
+			@Override
+			public double y()
+			{
+				return radius * Math.sin(angle);
+			}
+		};
+		
+		return coord;
+	}
+	
+	
+	@Override
+	public String toString()
+	{
+		return "Polar(" + angle + "rad, " + radius + ")";
+	}
+	
+	
+	@Override
+	public int hashCode()
+	{
+		final int prime = 31;
+		int result = 1;
+		long temp;
+		temp = Double.doubleToLongBits(angle);
+		result = prime * result + (int) (temp ^ (temp >>> 32));
+		temp = Double.doubleToLongBits(radius);
+		result = prime * result + (int) (temp ^ (temp >>> 32));
+		return result;
+	}
+	
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (this == obj) return true;
+		if (obj == null) return false;
+		if (!(obj instanceof Polar)) return false;
+		final Polar other = (Polar) obj;
+		if (Double.doubleToLongBits(angle) != Double.doubleToLongBits(other.angle)) return false;
+		if (Double.doubleToLongBits(radius) != Double.doubleToLongBits(other.radius)) return false;
+		return true;
+	}
+}

src/mightypork/util/math/Range.java

@@ -0,0 +1,182 @@
+package mightypork.util.math;
+
+
+import java.util.Random;
+
+
+/**
+ * Numeric range, able to generate random numbers and give min/max values.
+ * 
+ * @author MightyPork
+ */
+public class Range {
+	
+	public static Range make(double low, double high)
+	{
+		return new Range(low, high);
+	}
+	
+	private double min = 0;
+	private double max = 1;
+	
+	private static Random rand = new Random();
+	
+	
+	/**
+	 * Implicit range constructor 0-1
+	 */
+	public Range() {
+	}
+	
+	
+	/**
+	 * Create new range
+	 * 
+	 * @param min min number
+	 * @param max max number
+	 */
+	public Range(double min, double max) {
+		this.min = min;
+		this.max = max;
+		norm();
+	}
+	
+	
+	/**
+	 * Create new range
+	 * 
+	 * @param minmax min = max number
+	 */
+	public Range(double minmax) {
+		this.min = minmax;
+		this.max = minmax;
+	}
+	
+	
+	/**
+	 * Make sure min is <= max
+	 */
+	private void norm()
+	{
+		if (min > max) {
+			final double t = min;
+			min = max;
+			max = t;
+		}
+	}
+	
+	
+	/**
+	 * Get random integer from range
+	 * 
+	 * @return random int
+	 */
+	public int randInt()
+	{
+		return (int) (Math.round(min) + rand.nextInt((int) (Math.round(max) - Math.round(min)) + 1));
+	}
+	
+	
+	/**
+	 * Get random double from this range
+	 * 
+	 * @return random double
+	 */
+	public double randDouble()
+	{
+		return min + rand.nextDouble() * (max - min);
+	}
+	
+	
+	/**
+	 * Get min
+	 * 
+	 * @return min number
+	 */
+	public double getMin()
+	{
+		return min;
+	}
+	
+	
+	/**
+	 * Get max
+	 * 
+	 * @return max number
+	 */
+	public double getMax()
+	{
+		return max;
+	}
+	
+	
+	/**
+	 * Set min
+	 * 
+	 * @param min min value
+	 */
+	public void setMin(double min)
+	{
+		this.min = min;
+		norm();
+	}
+	
+	
+	/**
+	 * Set max
+	 * 
+	 * @param max max value
+	 */
+	public void setMax(double max)
+	{
+		this.max = max;
+		norm();
+	}
+	
+	
+	@Override
+	public String toString()
+	{
+		return String.format("{%.1f|%.1f}", min, max);
+	}
+	
+	
+	/**
+	 * Get identical copy
+	 * 
+	 * @return copy
+	 */
+	public Range copy()
+	{
+		return new Range(min, max);
+	}
+	
+	
+	/**
+	 * Set to value of other range
+	 * 
+	 * @param other copied range
+	 */
+	public void setTo(Range other)
+	{
+		if (other == null) return;
+		min = other.min;
+		max = other.max;
+		norm();
+	}
+	
+	
+	/**
+	 * Set to min-max values
+	 * 
+	 * @param min min value
+	 * @param max max value
+	 */
+	public void setTo(double min, double max)
+	{
+		this.min = min;
+		this.max = max;
+		norm();
+	}
+	
+}

src/mightypork/util/math/color/Color.java

@@ -0,0 +1,212 @@
+package mightypork.util.math.color;
+
+
+import java.util.Stack;
+
+import mightypork.util.annotations.FactoryMethod;
+import mightypork.util.math.Calc;
+import mightypork.util.math.constraints.num.Num;
+
+
+/**
+ * Color.<br>
+ * All values are 0-1
+ * 
+ * @author MightyPork
+ */
+public abstract class Color {
+	
+	public static final Color NONE = rgba(0, 0, 0, 0);
+	public static final Color SHADOW = rgba(0, 0, 0, 0.5);
+	
+	public static final Color WHITE = rgb(1, 1, 1);
+	public static final Color BLACK = rgb(0, 0, 0);
+	public static final Color DARK_GRAY = rgb(0.25, 0.25, 0.25);
+	public static final Color GRAY = rgb(0.5, 0.5, 0.5);
+	public static final Color LIGHT_GRAY = rgb(0.75, 0.75, 0.75);
+	
+	public static final Color RED = rgb(1, 0, 0);
+	public static final Color GREEN = rgb(0, 1, 0);
+	public static final Color BLUE = rgb(0, 0, 1);
+	
+	public static final Color YELLOW = rgb(1, 1, 0);
+	public static final Color MAGENTA = rgb(1, 0, 1);
+	public static final Color CYAN = rgb(0, 1, 1);
+	
+	public static final Color ORANGE = rgb(1, 0.78, 0);
+	public static final Color PINK = rgb(1, 0.68, 0.68);
+	
+	private static final Stack<Num> globalAlphaStack = new Stack<>();
+	
+	
+	@FactoryMethod
+	public static final Color rgb(double r, double g, double b)
+	{
+		return rgba(Num.make(r), Num.make(g), Num.make(b), Num.ONE);
+	}
+	
+	
+	@FactoryMethod
+	public static final Color rgba(double r, double g, double b, double a)
+	{
+		return rgba(Num.make(r), Num.make(g), Num.make(b), Num.make(a));
+	}
+	
+	
+	@FactoryMethod
+	public static final Color rgba(Num r, Num g, Num b)
+	{
+		return rgba(r, g, b, Num.ONE);
+	}
+	
+	
+	@FactoryMethod
+	public static final Color rgba(Num r, Num g, Num b, Num a)
+	{
+		return new ColorRgb(r, g, b, a);
+	}
+	
+	
+	@FactoryMethod
+	public static final Color hsb(double h, double s, double b)
+	{
+		return hsba(Num.make(h), Num.make(s), Num.make(b), Num.ONE);
+	}
+	
+	
+	@FactoryMethod
+	public static final Color hsba(double h, double s, double b, double a)
+	{
+		return hsba(Num.make(h), Num.make(s), Num.make(b), Num.make(a));
+	}
+	
+	
+	@FactoryMethod
+	public static final Color hsb(Num h, Num s, Num b)
+	{
+		return hsba(h, s, b, Num.ONE);
+	}
+	
+	
+	@FactoryMethod
+	public static final Color hsba(Num h, Num s, Num b, Num a)
+	{
+		return new ColorHsb(h, s, b, a);
+	}
+	
+	
+	@FactoryMethod
+	public static final Color light(double a)
+	{
+		return light(Num.make(a));
+	}
+	
+	
+	@FactoryMethod
+	public static final Color light(Num a)
+	{
+		return rgba(Num.ONE, Num.ONE, Num.ONE, a);
+	}
+	
+	
+	@FactoryMethod
+	public static final Color dark(double a)
+	{
+		return dark(Num.make(a));
+	}
+	
+	
+	@FactoryMethod
+	public static final Color dark(Num a)
+	{
+		return rgba(Num.ZERO, Num.ZERO, Num.ZERO, a);
+	}
+	
+	
+	protected static final double clamp(Num n)
+	{
+		return Calc.clampd(n.value(), 0, 1);
+	}
+	
+	
+	protected static final double clamp(double n)
+	{
+		return Calc.clampd(n, 0, 1);
+	}
+	
+	
+	/**
+	 * @return red 0-1
+	 */
+	public abstract double red();
+	
+	
+	/**
+	 * @return green 0-1
+	 */
+	public abstract double green();
+	
+	
+	/**
+	 * @return blue 0-1
+	 */
+	public abstract double blue();
+	
+	
+	/**
+	 * @return alpha 0-1
+	 */
+	public final double alpha()
+	{
+		double alpha = rawAlpha();
+		
+		for (Num n : globalAlphaStack) {
+			alpha *= clamp(n.value());
+		}
+		
+		return clamp(alpha);
+	}
+	
+	
+	/**
+	 * @return alpha 0-1, before multiplying with the global alpha value.
+	 */
+	protected abstract double rawAlpha();
+	
+	
+	/**
+	 * <p>
+	 * Push alpha multiplier on the stack (can be animated or whatever you
+	 * like). Once done with rendering, the popAlpha() method should be called,
+	 * otherwise you may experience unexpected glitches (such as all going
+	 * transparent).
+	 * </p>
+	 * <p>
+	 * multiplier value should not exceed the range 0..1, otherwise it will be
+	 * clamped to it.
+	 * </p>
+	 * 
+	 * @param alpha alpha multiplier
+	 */
+	public static void pushAlpha(Num alpha)
+	{
+		globalAlphaStack.push(alpha);
+	}
+	
+	
+	/**
+	 * Remove a pushed alpha multiplier from the stack. If there's no remaining
+	 * multiplier on the stack, an exception is raised.
+	 * 
+	 * @return the popped multiplier
+	 * @throws IllegalStateException if the stack is empty
+	 */
+	public static Num popAlpha()
+	{
+		if (globalAlphaStack.isEmpty()) {
+			throw new IllegalStateException("Global alpha stack underflow.");
+		}
+		
+		return globalAlphaStack.pop();
+	}
+}

src/mightypork/util/math/color/ColorHsb.java

@@ -0,0 +1,61 @@
+package mightypork.util.math.color;
+
+
+import mightypork.util.math.constraints.num.Num;
+
+
+public class ColorHsb extends Color {
+	
+	private final Num h;
+	private final Num s;
+	private final Num b;
+	private final Num a;
+	
+	
+	public ColorHsb(Num h, Num s, Num b, Num a) {
+		this.h = h;
+		this.s = s;
+		this.b = b;
+		this.a = a;
+	}
+	
+	
+	private double[] asRgb()
+	{
+		final int hex = java.awt.Color.HSBtoRGB((float) clamp(h), (float) clamp(s), (float) clamp(b));
+		
+		final int bi = hex & 0xff;
+		final int gi = (hex >> 8) & 0xff;
+		final int ri = (hex >> 16) & 0xff;
+		return new double[] { ri / 255D, gi / 255D, bi / 255D, clamp(a) };
+	}
+	
+	
+	@Override
+	public double red()
+	{
+		return asRgb()[0];
+	}
+	
+	
+	@Override
+	public double green()
+	{
+		return asRgb()[1];
+	}
+	
+	
+	@Override
+	public double blue()
+	{
+		return asRgb()[2];
+	}
+	
+	
+	@Override
+	public double rawAlpha()
+	{
+		return asRgb()[3];
+	}
+	
+}

src/mightypork/util/math/color/ColorRgb.java

@@ -0,0 +1,50 @@
+package mightypork.util.math.color;
+
+
+import mightypork.util.math.constraints.num.Num;
+
+
+public class ColorRgb extends Color {
+	
+	private final Num r;
+	private final Num g;
+	private final Num b;
+	private final Num a;
+	
+	
+	public ColorRgb(Num r, Num g, Num b, Num a) {
+		this.r = r;
+		this.g = g;
+		this.b = b;
+		this.a = a;
+	}
+	
+	
+	@Override
+	public double red()
+	{
+		return clamp(r);
+	}
+	
+	
+	@Override
+	public double green()
+	{
+		return clamp(g);
+	}
+	
+	
+	@Override
+	public double blue()
+	{
+		return clamp(b);
+	}
+	
+	
+	@Override
+	public double rawAlpha()
+	{
+		return clamp(a);
+	}
+	
+}

src/mightypork/util/math/constraints/ConstraintCache.java

@@ -0,0 +1,44 @@
+package mightypork.util.math.constraints;
+
+
+/**
+ * Constraint cache
+ * 
+ * @author MightyPork
+ * @param <C> constraint type
+ */
+public interface ConstraintCache<C> extends Pollable {
+	
+	/**
+	 * Called after the cache has changed value (and digest).
+	 */
+	void onChange();
+	
+	
+	/**
+	 * @return the cached value
+	 */
+	C getCacheSource();
+	
+	
+	/**
+	 * Enable caching & digest caching
+	 * 
+	 * @param yes enable caching
+	 */
+	void enableCaching(boolean yes);
+	
+	
+	/**
+	 * @return true if caching is on
+	 */
+	boolean isCachingEnabled();
+	
+	
+	/**
+	 * Update cached value and cached digest (if digest caching is enabled).<br>
+	 * source constraint is polled beforehand.
+	 */
+	@Override
+	void poll();
+}

src/mightypork/util/math/constraints/DigestCache.java

@@ -0,0 +1,60 @@
+package mightypork.util.math.constraints;
+
+
+/**
+ * Parametrized implementation of a {@link Digestable}
+ * 
+ * @author MightyPork
+ * @param <D> digest class
+ */
+public abstract class DigestCache<D> implements Digestable<D> {
+	
+	private D last_digest;
+	private boolean caching_enabled;
+	private boolean dirty = true;
+	
+	
+	@Override
+	public final D digest()
+	{
+		if (caching_enabled) {
+			if (dirty || last_digest == null) {
+				last_digest = createDigest();
+				dirty = false;
+			}
+			
+			return last_digest;
+		}
+		
+		return createDigest();
+	}
+	
+	
+	/**
+	 * @return fresh new digest
+	 */
+	protected abstract D createDigest();
+	
+	
+	@Override
+	public final void enableDigestCaching(boolean yes)
+	{
+		caching_enabled = yes;
+		markDigestDirty(); // mark dirty
+	}
+	
+	
+	@Override
+	public final boolean isDigestCachingEnabled()
+	{
+		return caching_enabled;
+	}
+	
+	
+	@Override
+	public final void markDigestDirty()
+	{
+		dirty = true;
+	}
+	
+}

src/mightypork/util/math/constraints/Digestable.java

@@ -0,0 +1,60 @@
+package mightypork.util.math.constraints;
+
+
+/**
+ * <p>
+ * Interface for constraints that support digests. Digest is a small data object
+ * with final fields, typically primitive, used for processing (such as
+ * rendering or other very frequent operations).
+ * </p>
+ * <p>
+ * Taking a digest is expensive, so if it needs to be done often and the value
+ * changes are deterministic (such as, triggered by timing event or screen
+ * resize), it's useful to cache the last digest and reuse it until such an
+ * event occurs again.
+ * </p>
+ * <p>
+ * Implementing class typically needs a field to store the last digest, a flag
+ * that digest caching is enabled, and a flag that a digest is dirty.
+ * </p>
+ * 
+ * @author MightyPork
+ * @param <D> digest class
+ */
+public interface Digestable<D> {
+	
+	/**
+	 * Take a digest. If digest caching is enabled and the cached digest is
+	 * marked as dirty, a new one should be made.
+	 * 
+	 * @return digest
+	 */
+	public D digest();
+	
+	
+	/**
+	 * <p>
+	 * Toggle digest caching.
+	 * </p>
+	 * <p>
+	 * To trigger update of the cache, call the <code>poll()</code> method.
+	 * </p>
+	 * 
+	 * @param yes
+	 */
+	void enableDigestCaching(boolean yes);
+	
+	
+	/**
+	 * @return true if digest caching is enabled.
+	 */
+	boolean isDigestCachingEnabled();
+	
+	
+	/**
+	 * If digest caching is enabled, mark current cached value as "dirty". Dirty
+	 * digest should be re-created next time a value is requested.<br>
+	 */
+	void markDigestDirty();
+	
+}

src/mightypork/util/math/constraints/Pollable.java

@@ -0,0 +1,15 @@
+package mightypork.util.math.constraints;
+
+
+/**
+ * Can be asked to update it's state
+ * 
+ * @author MightyPork
+ */
+public interface Pollable {
+	
+	/**
+	 * Update internal state
+	 */
+	void poll();
+}

src/mightypork/util/math/constraints/Poller.java

@@ -0,0 +1,47 @@
+package mightypork.util.math.constraints;
+
+
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+
+/**
+ * Used to poll a number of {@link Pollable}s
+ * 
+ * @author MightyPork
+ */
+public class Poller implements Pollable {
+	
+	private final Set<Pollable> pollables = new LinkedHashSet<>();
+	
+	
+	/**
+	 * Add a pollable
+	 * 
+	 * @param p pollable
+	 */
+	public void add(Pollable p)
+	{
+		pollables.add(p);
+	}
+	
+	
+	/**
+	 * Remove a pollalbe
+	 * 
+	 * @param p pollable
+	 */
+	public void remove(Pollable p)
+	{
+		pollables.remove(p);
+	}
+	
+	
+	@Override
+	public void poll()
+	{
+		for (final Pollable p : pollables) {
+			p.poll();
+		}
+	}
+}

src/mightypork/util/math/constraints/num/Num.java

@@ -0,0 +1,750 @@
+package mightypork.util.math.constraints.num;
+
+
+import mightypork.util.annotations.FactoryMethod;
+import mightypork.util.math.Calc;
+import mightypork.util.math.constraints.DigestCache;
+import mightypork.util.math.constraints.Digestable;
+import mightypork.util.math.constraints.num.caching.NumCache;
+import mightypork.util.math.constraints.num.caching.NumDigest;
+import mightypork.util.math.constraints.num.mutable.NumVar;
+import mightypork.util.math.constraints.num.proxy.NumBound;
+import mightypork.util.math.constraints.num.proxy.NumBoundAdapter;
+
+
+public abstract class Num implements NumBound, Digestable<NumDigest> {
+	
+	public static final NumConst ZERO = Num.make(0);
+	public static final NumConst ONE = Num.make(1);
+	
+	
+	@FactoryMethod
+	public static Num make(NumBound bound)
+	{
+		return new NumBoundAdapter(bound);
+	}
+	
+	
+	@FactoryMethod
+	public static NumConst make(double value)
+	{
+		return new NumConst(value);
+	}
+	
+	
+	@FactoryMethod
+	public static NumVar makeVar()
+	{
+		return makeVar(0);
+	}
+	
+	
+	@FactoryMethod
+	public static NumVar makeVar(double value)
+	{
+		return new NumVar(value);
+	}
+	
+	
+	@FactoryMethod
+	public static NumVar makeVar(Num copied)
+	{
+		return new NumVar(copied.value());
+	}
+	
+	private Num p_ceil;
+	private Num p_floor;
+	private Num p_sgn;
+	private Num p_round;
+	private Num p_atan;
+	private Num p_acos;
+	private Num p_asin;
+	private Num p_tan;
+	private Num p_cos;
+	private Num p_sin;
+	private Num p_cbrt;
+	private Num p_sqrt;
+	private Num p_cube;
+	private Num p_square;
+	private Num p_neg;
+	private Num p_abs;
+	
+	private DigestCache<NumDigest> dc = new DigestCache<NumDigest>() {
+		
+		@Override
+		protected NumDigest createDigest()
+		{
+			return new NumDigest(Num.this);
+		}
+	};
+	
+	
+	public NumConst freeze()
+	{
+		return new NumConst(value());
+	}
+	
+	
+	/**
+	 * Wrap this constraint into a caching adapter. Value will stay fixed (ie.
+	 * no re-calculations) until cache receives a poll() call.
+	 * 
+	 * @return the caching adapter
+	 */
+	public NumCache cached()
+	{
+		return new NumCache(this);
+	}
+	
+	
+	/**
+	 * Get a snapshot of the current state, to be used for processing.
+	 * 
+	 * @return digest
+	 */
+	
+	@Override
+	public NumDigest digest()
+	{
+		return dc.digest();
+	}
+	
+	
+	@Override
+	public void enableDigestCaching(boolean yes)
+	{
+		dc.enableDigestCaching(yes);
+	}
+	
+	
+	@Override
+	public boolean isDigestCachingEnabled()
+	{
+		return dc.isDigestCachingEnabled();
+	}
+	
+	
+	@Override
+	public void markDigestDirty()
+	{
+		dc.markDigestDirty();
+	}
+	
+	
+	@Override
+	public Num getNum()
+	{
+		return this;
+	}
+	
+	
+	/**
+	 * @return the number
+	 */
+	public abstract double value();
+	
+	
+	public Num add(final double addend)
+	{
+		return new Num() {
+			
+			private final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return t.value() + addend;
+			}
+		};
+	}
+	
+	
+	public Num add(final Num addend)
+	{
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return t.value() + addend.value();
+			}
+		};
+	}
+	
+	
+	public Num sub(final double subtrahend)
+	{
+		return add(-subtrahend);
+	}
+	
+	
+	public Num abs()
+	{
+		if (p_abs == null) p_abs = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.abs(t.value());
+			}
+		};
+		
+		return p_abs;
+	}
+	
+	
+	public Num sub(final Num subtrahend)
+	{
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return t.value() - subtrahend.value();
+			}
+		};
+	}
+	
+	
+	public Num div(final double factor)
+	{
+		return mul(1 / factor);
+	}
+	
+	
+	public Num div(final Num factor)
+	{
+		
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return t.value() / factor.value();
+			}
+		};
+	}
+	
+	
+	public Num mul(final double factor)
+	{
+		return new Num() {
+			
+			private final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return t.value() * factor;
+			}
+		};
+	}
+	
+	
+	public Num mul(final Num factor)
+	{
+		
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return t.value() * factor.value();
+			}
+		};
+	}
+	
+	
+	public Num average(final double other)
+	{
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return (t.value() + other) / 2;
+			}
+		};
+	}
+	
+	
+	public Num average(final Num other)
+	{
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return (t.value() + other.value()) / 2;
+			}
+		};
+	}
+	
+	
+	public Num perc(final double percent)
+	{
+		return mul(percent / 100);
+	}
+	
+	
+	public Num perc(final Num percent)
+	{
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return t.value() * (percent.value() / 100);
+			}
+		};
+	}
+	
+	
+	public Num cos()
+	{
+		if (p_cos == null) p_cos = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.cos(t.value());
+			}
+		};
+		
+		return p_cos;
+	}
+	
+	
+	public Num acos()
+	{
+		if (p_acos == null) p_acos = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.acos(t.value());
+			}
+		};
+		
+		return p_acos;
+	}
+	
+	
+	public Num sin()
+	{
+		if (p_sin == null) p_sin = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.sin(t.value());
+			}
+		};
+		
+		return p_sin;
+	}
+	
+	
+	public Num asin()
+	{
+		if (p_asin == null) p_asin = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.asin(t.value());
+			}
+		};
+		
+		return p_asin;
+	}
+	
+	
+	public Num tan()
+	{
+		if (p_tan == null) p_tan = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.tan(t.value());
+			}
+		};
+		
+		return p_tan;
+	}
+	
+	
+	public Num atan()
+	{
+		if (p_atan == null) p_atan = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.atan(t.value());
+			}
+		};
+		
+		return p_atan;
+	}
+	
+	
+	public Num cbrt()
+	{
+		if (p_cbrt == null) p_cbrt = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.cbrt(t.value());
+			}
+		};
+		
+		return p_cbrt;
+	}
+	
+	
+	public Num sqrt()
+	{
+		if (p_sqrt == null) p_sqrt = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.sqrt(t.value());
+			}
+		};
+		
+		return p_sqrt;
+	}
+	
+	
+	public Num neg()
+	{
+		if (p_neg == null) p_neg = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return -1 * t.value();
+			}
+		};
+		
+		return p_neg;
+	}
+	
+	
+	public Num round()
+	{
+		if (p_round == null) p_round = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.round(t.value());
+			}
+		};
+		
+		return p_round;
+	}
+	
+	
+	public Num floor()
+	{
+		if (p_floor == null) p_floor = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.floor(t.value());
+			}
+		};
+		
+		return p_floor;
+	}
+	
+	
+	public Num ceil()
+	{
+		if (p_ceil == null) p_ceil = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.round(t.value());
+			}
+		};
+		
+		return p_ceil;
+	}
+	
+	
+	public Num pow(final double other)
+	{
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.pow(t.value(), other);
+			}
+		};
+	}
+	
+	
+	public Num pow(final Num power)
+	{
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.pow(t.value(), power.value());
+			}
+		};
+	}
+	
+	
+	public Num cube()
+	{
+		if (p_cube == null) p_cube = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				final double v = t.value();
+				return v * v * v;
+			}
+		};
+		
+		return p_cube;
+	}
+	
+	
+	public Num square()
+	{
+		if (p_square == null) p_square = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				final double v = t.value();
+				return v * v;
+			}
+		};
+		
+		return p_square;
+	}
+	
+	
+	public Num half()
+	{
+		return mul(0.5);
+	}
+	
+	
+	public Num max(final double other)
+	{
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.max(t.value(), other);
+			}
+		};
+	}
+	
+	
+	public Num max(final Num other)
+	{
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.max(t.value(), other.value());
+			}
+		};
+	}
+	
+	
+	public Num min(final Num other)
+	{
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.min(t.value(), other.value());
+			}
+		};
+	}
+	
+	
+	public Num min(final double other)
+	{
+		return new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.min(t.value(), other);
+			}
+		};
+	}
+	
+	
+	public Num signum()
+	{
+		if (p_sgn == null) p_sgn = new Num() {
+			
+			final Num t = Num.this;
+			
+			
+			@Override
+			public double value()
+			{
+				return Math.signum(t.value());
+			}
+		};
+		
+		return p_sgn;
+	}
+	
+	
+	public boolean isNegative()
+	{
+		return value() < 0;
+	}
+	
+	
+	public boolean isPositive()
+	{
+		return value() > 0;
+	}
+	
+	
+	public boolean isZero()
+	{
+		return value() == 0;
+	}
+	
+	
+	@Override
+	public int hashCode()
+	{
+		final int prime = 31;
+		int result = 1;
+		long temp;
+		temp = Double.doubleToLongBits(value());
+		result = prime * result + (int) (temp ^ (temp >>> 32));
+		return result;
+	}
+	
+	
+	@Override
+	public boolean equals(Object obj)
+	{
+		if (this == obj) return true;
+		if (obj == null) return false;
+		if (!(obj instanceof Num)) return false;
+		final Num other = (Num) obj;
+		
+		return value() == other.value();
+	}
+	
+	
+	@Override
+	public String toString()
+	{
+		return Calc.toString(value());
+	}
+}

src/mightypork/util/math/constraints/num/NumConst.java

@@ -0,0 +1,268 @@
+package mightypork.util.math.constraints.num;
+
+
+import mightypork.util.math.constraints.num.caching.NumDigest;
+
+
+/**
+ * Constant number.<br>
+ * It's arranged so that operations with constant arguments yield constant
+ * results.
+ * 
+ * @author MightyPork
+ */
+public class NumConst extends Num {
+	
+	private final double value;
+	private NumDigest digest;
+	
+	
+	NumConst(Num copied) {
+		this.value = copied.value();
+	}
+	
+	
+	NumConst(double value) {
+		this.value = value;
+	}
+	
+	
+	@Override
+	public double value()
+	{
+		return value;
+	}
+	
+	
+	/**
+	 * @deprecated No good to copy a constant.
+	 */
+	@Override
+	@Deprecated
+	public NumConst freeze()
+	{
+		return this;
+	}
+	
+	
+	@Override
+	public NumDigest digest()
+	{
+		return (digest != null) ? digest : (digest = super.digest());
+	}
+	
+	
+	@Override
+	public NumConst add(double addend)
+	{
+		return Num.make(value() + addend);
+	}
+	
+	
+	public NumConst add(NumConst addend)
+	{
+		return Num.make(value + addend.value);
+	}
+	
+	
+	@Override
+	public NumConst sub(double subtrahend)
+	{
+		return add(-subtrahend);
+	}
+	
+	
+	public NumConst sub(NumConst addend)
+	{
+		return Num.make(value - addend.value);
+	}
+	
+	
+	@Override
+	public NumConst mul(double factor)
+	{
+		return Num.make(value() * factor);
+	}
+	
+	
+	public NumConst mul(NumConst addend)
+	{
+		return Num.make(value * addend.value);
+	}
+	
+	
+	@Override
+	public NumConst div(double factor)
+	{
+		return mul(1 / factor);
+	}
+	
+	
+	public NumConst div(NumConst addend)
+	{
+		return Num.make(value / addend.value);
+	}
+	
+	
+	@Override
+	public NumConst perc(double percents)
+	{
+		return mul(percents / 100);
+	}
+	
+	
+	@Override
+	public NumConst neg()
+	{
+		return mul(-1);
+	}
+	
+	
+	@Override
+	public NumConst abs()
+	{
+		return Num.make(Math.abs(value()));
+	}
+	
+	
+	@Override
+	public NumConst max(double other)
+	{
+		return Num.make(Math.max(value(), other));
+	}
+	
+	
+	@Override
+	public NumConst min(double other)
+	{
+		return Num.make(Math.min(value(), other));
+	}
+	
+	
+	@Override
+	public NumConst pow(double power)
+	{
+		return Num.make(Math.pow(value(), power));
+	}
+	
+	
+	@Override
+	public NumConst square()
+	{
+		final double v = value();
+		return Num.make(v * v);
+	}
+	
+	
+	@Override
+	public NumConst cube()
+	{
+		final double v = value();
+		return Num.make(v * v * v);
+	}
+	
+	
+	@Override
+	public NumConst sqrt()
+	{
+		return Num.make(Math.sqrt(value()));
+	}
+	
+	
+	@Override
+	public NumConst cbrt()
+	{
+		return Num.make(Math.cbrt(value()));
+	}
+	
+	
+	@Override
+	public NumConst sin()
+	{
+		return Num.make(Math.sin(value()));
+	}
+	
+	
+	@Override
+	public NumConst cos()
+	{
+		return Num.make(Math.cos(value()));
+	}
+	
+	
+	@Override
+	public NumConst tan()
+	{
+		return Num.make(Math.tan(value()));
+	}
+	
+	
+	@Override
+	public NumConst asin()
+	{
+		return Num.make(Math.asin(value()));
+	}
+	
+	
+	@Override
+	public NumConst acos()
+	{
+		return Num.make(Math.acos(value()));
+	}
+	
+	
+	@Override
+	public NumConst atan()
+	{
+		return Num.make(Math.atan(value()));
+	}
+	
+	
+	@Override
+	public NumConst signum()
+	{
+		return Num.make(Math.signum(value()));
+	}
+	
+	
+	@Override
+	public NumConst average(double other)
+	{
+		return Num.make((value() + other) / 2);
+	}
+	
+	
+	public NumConst average(NumConst other)
+	{
+		return super.average(other).freeze();
+	}
+	
+	
+	@Override
+	public NumConst round()
+	{
+		return Num.make(Math.round(value()));
+	}
+	
+	
+	@Override
+	public NumConst ceil()
+	{
+		return Num.make(Math.ceil(value()));
+	}
+	
+	
+	@Override
+	public NumConst floor()
+	{
+		return Num.make(Math.floor(value()));
+	}
+	
+	
+	@Override
+	public NumConst half()
+	{
+		return mul(0.5);
+	}
+	
+}

src/mightypork/util/math/constraints/num/caching/AbstractNumCache.java

@@ -0,0 +1,83 @@
+package mightypork.util.math.constraints.num.caching;
+
+
+import mightypork.util.math.constraints.ConstraintCache;
+import mightypork.util.math.constraints.num.Num;
+import mightypork.util.math.constraints.num.mutable.NumVar;
+import mightypork.util.math.constraints.num.proxy.NumAdapter;
+
+
+/**
+ * <p>
+ * A Num cache.
+ * </p>
+ * <p>
+ * Values are held in a caching VectVar, and digest caching is enabled by
+ * default.
+ * </p>
+ * 
+ * @author MightyPork
+ */
+public abstract class AbstractNumCache extends NumAdapter implements ConstraintCache<Num> {
+	
+	private final NumVar cache = Num.makeVar();
+	private boolean inited = false;
+	private boolean cachingEnabled = true;
+	
+	
+	public AbstractNumCache() {
+		enableDigestCaching(true); // it changes only on poll
+	}
+	
+	
+	@Override
+	protected final Num getSource()
+	{
+		if (!inited) markDigestDirty();
+		
+		return (cachingEnabled ? cache : getCacheSource());
+	}
+	
+	
+	@Override
+	public final void poll()
+	{
+		inited = true;
+		
+		// poll source
+		final Num source = getCacheSource();
+		source.markDigestDirty(); // poll cached
+		
+		// store source value
+		cache.setTo(source);
+		
+		// mark my digest dirty
+		markDigestDirty();
+		
+		onChange();
+	}
+	
+	
+	@Override
+	public abstract void onChange();
+	
+	
+	@Override
+	public abstract Num getCacheSource();
+	
+	
+	@Override
+	public final void enableCaching(boolean yes)
+	{
+		cachingEnabled = yes;
+		enableDigestCaching(yes);
+	}
+	
+	
+	@Override
+	public final boolean isCachingEnabled()
+	{
+		return cachingEnabled;
+	}
+	
+}

src/mightypork/util/math/constraints/num/caching/NumCache.java

@@ -0,0 +1,36 @@
+package mightypork.util.math.constraints.num.caching;
+
+
+import mightypork.util.annotations.DefaultImpl;
+import mightypork.util.math.constraints.num.Num;
+
+
+/**
+ * Num cache implementation
+ * 
+ * @author MightyPork
+ */
+public class NumCache extends AbstractNumCache {
+	
+	private final Num source;
+	
+	
+	public NumCache(Num source) {
+		this.source = source;
+	}
+	
+	
+	@Override
+	public final Num getCacheSource()
+	{
+		return source;
+	}
+	
+	
+	@Override
+	@DefaultImpl
+	public void onChange()
+	{
+	}
+	
+}

src/mightypork/util/math/constraints/num/caching/NumDigest.java

@@ -0,0 +1,22 @@
+package mightypork.util.math.constraints.num.caching;
+
+
+import mightypork.util.math.constraints.num.Num;
+
+
+public class NumDigest {
+	
+	public final double value;
+	
+	
+	public NumDigest(Num num) {
+		this.value = num.value();
+	}
+	
+	
+	@Override
+	public String toString()
+	{
+		return String.format("Num(%.1f)", value);
+	}
+}

src/mightypork/util/math/constraints/num/mutable/NumAnimated.java

@@ -0,0 +1,378 @@
+package mightypork.util.math.constraints.num.mutable;
+
+
+import mightypork.util.control.timing.Pauseable;
+import mightypork.util.control.timing.Updateable;
+import mightypork.util.math.Calc;
+import mightypork.util.math.Easing;
+
+
+/**
+ * Double which supports delta timing
+ * 
+ * @author MightyPork
+ */
+public class NumAnimated extends NumMutable implements Updateable, Pauseable {
+	
+	/** target double */
+	protected double to = 0;
+	
+	/** last tick double */
+	protected double from = 0;
+	
+	/** how long the transition should last */
+	protected double duration = 0;
+	
+	/** current anim time */
+	protected double elapsedTime = 0;
+	
+	/** True if this animator is paused */
+	protected boolean paused = false;
+	
+	/** Easing fn */
+	protected Easing easing = Easing.LINEAR;
+	
+	/** Default duration (seconds) */
+	private double defaultDuration = 0;
+	
+	
+	/**
+	 * Create linear animator
+	 * 
+	 * @param value initial value
+	 */
+	public NumAnimated(double value) {
+		setTo(value);
+	}
+	
+	
+	/**
+	 * Create animator with easing
+	 * 
+	 * @param value initial value
+	 * @param easing easing function
+	 */
+	public NumAnimated(double value, Easing easing) {
+		this(value);
+		setEasing(easing);
+	}
+	
+	
+	/**
+	 * Create as copy of another
+	 * 
+	 * @param other other animator
+	 */
+	public NumAnimated(NumAnimated other) {
+		setTo(other);
+	}
+	
+	
+	/**
+	 * @return easing function
+	 */
+	public Easing getEasing()
+	{
+		return easing;
+	}
+	
+	
+	/**
+	 * @param easing easing function
+	 */
+	public void setEasing(Easing easing)
+	{
+		this.easing = easing;
+	}
+	
+	
+	/**
+	 * Get start value
+	 * 
+	 * @return number
+	 */
+	public double getStart()
+	{
+		return from;
+	}
+	
+	
+	/**
+	 * Get end value
+	 * 
+	 * @return number
+	 */
+	public double getEnd()
+	{
+		return to;
+	}
+	
+	
+	/**
+	 * @return current animation duration (seconds)
+	 */
+	public double getDuration()
+	{
+		return duration;
+	}
+	
+	
+	/**
+	 * @return elapsed time in current animation (seconds)
+	 */
+	public double getElapsed()
+	{
+		return elapsedTime;
+	}
+	
+	
+	/**
+	 * @return default animation duration (seconds)
+	 */
+	public double getDefaultDuration()
+	{
+		return defaultDuration;
+	}
+	
+	
+	/**
+	 * @param defaultDuration default animation duration (seconds)
+	 */
+	public void setDefaultDuration(double defaultDuration)
+	{
+		this.defaultDuration = defaultDuration;
+	}
+	
+	
+	/**
+	 * Get value at delta time
+	 * 
+	 * @return the value
+	 */
+	@Override
+	public double value()
+	{
+		if (duration == 0) return to;
+		return Calc.interpolate(from, to, (elapsedTime / duration), easing);
+	}
+	
+	
+	/**
+	 * Get how much of the animation is already finished
+	 * 
+	 * @return completion ratio (0 to 1)
+	 */
+	public double getProgress()
+	{
+		if (duration == 0) return 1;
+		return elapsedTime / duration;
+	}
+	
+	
+	@Override
+	public void update(double delta)
+	{
+		if (paused || isFinished()) return;
+		
+		elapsedTime = Calc.clampd(elapsedTime + delta, 0, duration);
+		if (isFinished()) {
+			duration = 0;
+			elapsedTime = 0;
+			from = to;
+		}
+	}
+	
+	
+	/**
+	 * Get if animation is finished
+	 * 
+	 * @return is finished
+	 */
+	public boolean isFinished()
+	{
+		return duration == 0 || elapsedTime >= duration;
+	}
+	
+	
+	/**
+	 * Set to a value (without animation)
+	 * 
+	 * @param value
+	 */
+	@Override
+	public void setTo(double value)
+	{
+		from = to = value;
+		elapsedTime = 0;
+		duration = defaultDuration;
+	}
+	
+	
+	/**
+	 * Copy other
+	 * 
+	 * @param other
+	 */
+	public void setTo(NumAnimated other)
+	{
+		this.from = other.from;
+		this.to = other.to;
+		this.duration = other.duration;
+		this.elapsedTime = other.elapsedTime;
+		this.paused = other.paused;
+		this.easing = other.easing;
+		this.defaultDuration = other.defaultDuration;
+	}
+	
+	
+	/**
+	 * Animate between two states, start from current value (if it's in between)
+	 * 
+	 * @param from start value
+	 * @param to target state
+	 * @param time animation time (secs)
+	 */
+	public void animate(double from, double to, double time)
+	{
+		final double current = value();
+		
+		this.from = from;
+		this.to = to;
+		
+		final double progress = getProgressFromValue(current);
+		
+		this.from = (progress > 0 ? current : from);
+		
+		this.duration = time * (1 - progress);
+		this.elapsedTime = 0;
+	}
+	
+	
+	/**
+	 * Get progress already elapsed based on current value.<br>
+	 * Used to resume animation from current point in fading etc.
+	 * 
+	 * @param value current value
+	 * @return progress ratio 0-1
+	 */
+	protected double getProgressFromValue(double value)
+	{
+		double p = 0;
+		
+		if (from == to) return 0;
+		
+		if (value >= from && value <= to) { // up
+			p = ((value - from) / (to - from));
+		} else if (value >= to && value <= from) { // down
+			p = ((from - value) / (from - to));
+		}
+		
+		return p;
+	}
+	
+	
+	/**
+	 * Animate to a value from current value
+	 * 
+	 * @param to target state
+	 * @param duration animation duration (speeds)
+	 */
+	public void animate(double to, double duration)
+	{
+		this.from = value();
+		this.to = to;
+		this.duration = duration;
+		this.elapsedTime = 0;
+	}
+	
+	
+	/**
+	 * Animate 0 to 1
+	 * 
+	 * @param time animation time (secs)
+	 */
+	public void fadeIn(double time)
+	{
+		animate(0, 1, time);
+	}
+	
+	
+	/**
+	 * Animate 1 to 0
+	 * 
+	 * @param time animation time (secs)
+	 */
+	public void fadeOut(double time)
+	{
+		animate(1, 0, time);
+	}
+	
+	
+	/**
+	 * Make a copy
+	 * 
+	 * @return copy
+	 */
+	@Override
+	public NumAnimated clone()
+	{
+		return new NumAnimated(this);
+	}
+	
+	
+	@Override
+	public String toString()
+	{
+		return "Animation(" + from + " -> " + to + ", t=" + duration + "s, elapsed=" + elapsedTime + "s)";
+	}
+	
+	
+	/**
+	 * Set to zero and stop animation
+	 */
+	public void clear()
+	{
+		from = to = 0;
+		elapsedTime = 0;
+		duration = 0;
+		paused = false;
+	}
+	
+	
+	/**
+	 * Stop animation, keep current value
+	 */
+	public void stop()
+	{
+		from = to = value();
+		elapsedTime = 0;
+		duration = 0;
+	}
+	
+	
+	@Override
+	public void pause()
+	{
+		paused = true;
+	}
+	
+	
+	@Override
+	public void resume()
+	{
+		paused = false;
+	}
+	
+	
+	@Override
+	public boolean isPaused()
+	{
+		return paused;
+	}
+	
+	
+	public boolean isInProgress()
+	{
+		return !isFinished() && !isPaused();
+	}
+}

src/mightypork/util/math/constraints/num/mutable/NumAnimatedDeg.java

@@ -0,0 +1,50 @@
+package mightypork.util.math.constraints.num.mutable;
+
+
+import mightypork.util.math.Calc;
+import mightypork.util.math.Calc.Deg;
+import mightypork.util.math.Easing;
+
+
+/**
+ * Degree animator
+ * 
+ * @author MightyPork
+ */
+public class NumAnimatedDeg extends NumAnimated {
+	
+	public NumAnimatedDeg(NumAnimated other) {
+		super(other);
+	}
+	
+	
+	public NumAnimatedDeg(double value) {
+		super(value);
+	}
+	
+	
+	public NumAnimatedDeg(double value, Easing easing) {
+		super(value, easing);
+	}
+	
+	
+	@Override
+	public double value()
+	{
+		if (duration == 0) return Deg.norm(to);
+		return Calc.interpolateDeg(from, to, (elapsedTime / duration), easing);
+	}
+	
+	
+	@Override
+	protected double getProgressFromValue(double value)
+	{
+		final double whole = Deg.diff(from, to);
+		if (Deg.diff(value, from) < whole && Deg.diff(value, to) < whole) {
+			final double partial = Deg.diff(from, value);
+			return partial / whole;
+		}
+		
+		return 0;
+	}
+}

src/mightypork/util/math/constraints/num/mutable/NumAnimatedRad.java

@@ -0,0 +1,50 @@
+package mightypork.util.math.constraints.num.mutable;
+
+
+import mightypork.util.math.Calc;
+import mightypork.util.math.Calc.Rad;
+import mightypork.util.math.Easing;
+
+
+/**
+ * Radians animator
+ * 
+ * @author MightyPork
+ */
+public class NumAnimatedRad extends NumAnimated {
+	
+	public NumAnimatedRad(NumAnimated other) {
+		super(other);
+	}
+	
+	
+	public NumAnimatedRad(double value) {
+		super(value);
+	}
+	
+	
+	public NumAnimatedRad(double value, Easing easing) {
+		super(value, easing);
+	}
+	
+	
+	@Override
+	public double value()
+	{
+		if (duration == 0) return Rad.norm(to);
+		return Calc.interpolateRad(from, to, (elapsedTime / duration), easing);
+	}
+	
+	
+	@Override
+	protected double getProgressFromValue(double value)
+	{
+		final double whole = Rad.diff(from, to);
+		if (Rad.diff(value, from) < whole && Rad.diff(value, to) < whole) {
+			final double partial = Rad.diff(from, value);
+			return partial / whole;
+		}
+		
+		return 0;
+	}
+}

src/mightypork/util/math/constraints/num/mutable/NumMutable.java

@@ -0,0 +1,41 @@
+package mightypork.util.math.constraints.num.mutable;
+
+
+import mightypork.util.math.constraints.num.Num;
+
+
+/**
+ * Mutable numeric variable
+ * 
+ * @author MightyPork
+ */
+public abstract class NumMutable extends Num {
+	
+	/**
+	 * Assign a value
+	 * 
+	 * @param value new value
+	 */
+	public abstract void setTo(double value);
+	
+	
+	/**
+	 * Assign a value
+	 * 
+	 * @param value new value
+	 */
+	public void setTo(Num value)
+	{
+		setTo(value.value());
+	}
+	
+	
+	/**
+	 * Set to zero
+	 */
+	public void reset()
+	{
+		setTo(0);
+	}
+	
+}

src/mightypork/util/math/constraints/num/mutable/NumVar.java

@@ -0,0 +1,40 @@
+package mightypork.util.math.constraints.num.mutable;
+
+
+import mightypork.util.math.constraints.num.Num;
+
+
+/**
+ * Mutable numeric variable.
+ * 
+ * @author MightyPork
+ */
+public class NumVar extends NumMutable {
+	
+	private double value;
+	
+	
+	public NumVar(Num value) {
+		this(value.value());
+	}
+	
+	
+	public NumVar(double value) {
+		this.value = value;
+	}
+	
+	
+	@Override
+	public double value()
+	{
+		return value;
+	}
+	
+	
+	@Override
+	public void setTo(double value)
+	{
+		this.value = value;
+	}
+	
+}

src/mightypork/util/math/constraints/num/proxy/NumAdapter.java

@@ -0,0 +1,18 @@
+package mightypork.util.math.constraints.num.proxy;
+
+
+import mightypork.util.math.constraints.num.Num;
+
+
+public abstract class NumAdapter extends Num {
+	
+	protected abstract Num getSource();
+	
+	
+	@Override
+	public double value()
+	{
+		return getSource().value();
+	}
+	
+}

src/mightypork/util/math/constraints/num/proxy/NumBound.java

@@ -0,0 +1,19 @@
+package mightypork.util.math.constraints.num.proxy;
+
+
+import mightypork.util.math.constraints.num.Num;
+
+
+/**
+ * Numeric constraint
+ * 
+ * @author MightyPork
+ */
+public interface NumBound {
+	
+	/**
+	 * @return current value
+	 */
+	Num getNum();
+	
+}

src/mightypork/util/math/constraints/num/proxy/NumBoundAdapter.java

@@ -0,0 +1,34 @@
+package mightypork.util.math.constraints.num.proxy;
+
+
+import mightypork.util.math.constraints.num.Num;
+
+
+public class NumBoundAdapter extends NumAdapter implements PluggableNumBound {
+	
+	private NumBound backing = null;
+	
+	
+	public NumBoundAdapter() {
+	}
+	
+	
+	public NumBoundAdapter(NumBound bound) {
+		backing = bound;
+	}
+	
+	
+	@Override
+	public void setNum(NumBound rect)
+	{
+		this.backing = rect;
+	}
+	
+	
+	@Override
+	protected Num getSource()
+	{
+		return backing.getNum();
+	}
+	
+}

src/mightypork/util/math/constraints/num/proxy/NumProxy.java

@@ -0,0 +1,23 @@
+package mightypork.util.math.constraints.num.proxy;
+
+
+import mightypork.util.math.constraints.num.Num;
+
+
+public class NumProxy extends NumAdapter {
+	
+	private final Num source;
+	
+	
+	public NumProxy(Num source) {
+		this.source = source;
+	}
+	
+	
+	@Override
+	protected Num getSource()
+	{
+		return source;
+	}
+	
+}

src/mightypork/util/math/constraints/num/proxy/PluggableNumBound.java

@@ -0,0 +1,16 @@
+package mightypork.util.math.constraints.num.proxy;
+
+
+/**
+ * Pluggable numeric constraint
+ * 
+ * @author MightyPork
+ */
+public interface PluggableNumBound extends NumBound {
+	
+	/**
+	 * @param num bound to set
+	 */
+	abstract void setNum(NumBound num);
+	
+}

src/mightypork/util/math/constraints/rect/Rect.java

@@ -0,0 +1,943 @@
+package mightypork.util.math.constraints.rect;
+
+
+import mightypork.util.annotations.FactoryMethod;
+import mightypork.util.math.constraints.DigestCache;
+import mightypork.util.math.constraints.Digestable;
+import mightypork.util.math.constraints.num.Num;
+import mightypork.util.math.constraints.num.NumConst;
+import mightypork.util.math.constraints.rect.builders.TiledRect;
+import mightypork.util.math.constraints.rect.caching.RectCache;
+import mightypork.util.math.constraints.rect.caching.RectDigest;
+import mightypork.util.math.constraints.rect.mutable.RectVar;
+import mightypork.util.math.constraints.rect.proxy.RectBound;
+import mightypork.util.math.constraints.rect.proxy.RectBoundAdapter;
+import mightypork.util.math.constraints.rect.proxy.RectVectAdapter;
+import mightypork.util.math.constraints.vect.Vect;
+import mightypork.util.math.constraints.vect.VectConst;
+
+
+/**
+ * Common methods for all kinds of Rects
+ * 
+ * @author MightyPork
+ */
+public abstract class Rect implements RectBound, Digestable<RectDigest> {
+	
+	public static final RectConst ZERO = new RectConst(0, 0, 0, 0);
+	public static final RectConst ONE = new RectConst(0, 0, 1, 1);
+	
+	
+	@FactoryMethod
+	public static Rect make(Num width, Num height)
+	{
+		final Vect origin = Vect.ZERO;
+		final Vect size = Vect.make(width, height);
+		
+		return Rect.make(origin, size);
+	}
+	
+	
+	public static Rect make(Vect size)
+	{
+		return Rect.make(size.xn(), size.yn());
+	}
+	
+	
+	@FactoryMethod
+	public static Rect make(RectBound bound)
+	{
+		return new RectBoundAdapter(bound);
+	}
+	
+	
+	@FactoryMethod
+	public static Rect make(Num x, Num y, Num width, Num height)
+	{
+		final Vect origin = Vect.make(x, y);
+		final Vect size = Vect.make(width, height);
+		
+		return Rect.make(origin, size);
+	}
+	
+	
+	@FactoryMethod
+	public static Rect make(Vect origin, Num width, Num height)
+	{
+		return make(origin, Vect.make(width, height));
+	}
+	
+	
+	@FactoryMethod
+	public static Rect make(final Vect origin, final Vect size)
+	{
+		return new RectVectAdapter(origin, size);
+	}
+	
+	
+	@FactoryMethod
+	public static RectConst make(NumConst width, NumConst height)
+	{
+		final VectConst origin = Vect.ZERO;
+		final VectConst size = Vect.make(width, height);
+		
+		return Rect.make(origin, size);
+	}
+	
+	
+	public static Rect make(Num side)
+	{
+		return make(side, side);
+	}
+	
+	
+	public static RectConst make(NumConst side)
+	{
+		return make(side, side);
+	}
+	
+	
+	public static RectConst make(double side)
+	{
+		return make(side, side);
+	}
+	
+	
+	@FactoryMethod
+	public static RectConst make(NumConst x, NumConst y, NumConst width, NumConst height)
+	{
+		final VectConst origin = Vect.make(x, y);
+		final VectConst size = Vect.make(width, height);
+		
+		return Rect.make(origin, size);
+	}
+	
+	
+	@FactoryMethod
+	public static RectConst make(final VectConst origin, final VectConst size)
+	{
+		return new RectConst(origin, size);
+	}
+	
+	
+	@FactoryMethod
+	public static RectConst make(double width, double height)
+	{
+		return Rect.make(0, 0, width, height);
+	}
+	
+	
+	@FactoryMethod
+	public static RectConst make(double x, double y, double width, double height)
+	{
+		return new RectConst(x, y, width, height);
+	}
+	
+	
+	@FactoryMethod
+	public static RectVar makeVar(double x, double y)
+	{
+		return Rect.makeVar(0, 0, x, y);
+	}
+	
+	
+	@FactoryMethod
+	public static RectVar makeVar(Rect copied)
+	{
+		return Rect.makeVar(copied.origin(), copied.size());
+	}
+	
+	
+	@FactoryMethod
+	public static RectVar makeVar(Vect origin, Vect size)
+	{
+		return Rect.makeVar(origin.x(), origin.y(), size.x(), size.y());
+	}
+	
+	
+	@FactoryMethod
+	public static RectVar makeVar(double x, double y, double width, double height)
+	{
+		return new RectVar(x, y, width, height);
+	}
+	
+	
+	@FactoryMethod
+	public static RectVar makeVar()
+	{
+		return Rect.makeVar(Rect.ZERO);
+	}
+	
+	private Vect p_bl;
+	private Vect p_bc;
+	private Vect p_br;
+	// p_t == origin
+	private Vect p_tc;
+	private Vect p_tr;
+	
+	private Vect p_cl;
+	private Vect p_cc;
+	private Vect p_cr;
+	
+	private Num p_x;
+	private Num p_y;
+	private Num p_w;
+	private Num p_h;
+	private Num p_l;
+	private Num p_r;
+	private Num p_t;
+	private Num p_b;
+	private Rect p_edge_l;
+	private Rect p_edge_r;
+	private Rect p_edge_t;
+	private Rect p_edge_b;
+	
+	private DigestCache<RectDigest> dc = new DigestCache<RectDigest>() {
+		
+		@Override
+		protected RectDigest createDigest()
+		{
+			return new RectDigest(Rect.this);
+		}
+	};
+	
+	
+	/**
+	 * Get a copy of current value
+	 * 
+	 * @return copy
+	 */
+	public RectConst freeze()
+	{
+		// must NOT call RectVal.make, it'd cause infinite recursion.
+		return new RectConst(this);
+	}
+	
+	
+	/**
+	 * Wrap this constraint into a caching adapter. Value will stay fixed (ie.
+	 * no re-calculations) until cache receives a poll() call.
+	 * 
+	 * @return the caching adapter
+	 */
+	public RectCache cached()
+	{
+		return new RectCache(this);
+	}
+	
+	
+	@Override
+	public RectDigest digest()
+	{
+		return dc.digest();
+	}
+	
+	
+	@Override
+	public void enableDigestCaching(boolean yes)
+	{
+		dc.enableDigestCaching(yes);
+	}
+	
+	
+	@Override
+	public boolean isDigestCachingEnabled()
+	{
+		return dc.isDigestCachingEnabled();
+	}
+	
+	
+	@Override
+	public void markDigestDirty()
+	{
+		dc.markDigestDirty();
+	}
+	
+	
+	@Override
+	public Rect getRect()
+	{
+		return this;
+	}
+	
+	
+	@Override
+	public String toString()
+	{
+		return String.format("Rect { at %s , size %s }", origin(), size());
+	}
+	
+	
+	/**
+	 * Origin (top left).
+	 * 
+	 * @return origin (top left)
+	 */
+	public abstract Vect origin();
+	
+	
+	/**
+	 * Size (spanning right down from Origin).
+	 * 
+	 * @return size vector
+	 */
+	public abstract Vect size();
+	
+	
+	/**
+	 * Add vector to origin
+	 * 
+	 * @param move offset vector
+	 * @return result
+	 */
+	public Rect move(final Vect move)
+	{
+		return new Rect() {
+			
+			private final Rect t = Rect.this;
+			
+			
+			@Override
+			public Vect size()
+			{
+				return t.size();
+			}
+			
+			
+			@Override
+			public Vect origin()
+			{
+				return t.origin().add(move);
+			}
+			
+		};
+	}
+	
+	
+	public Rect moveX(Num x)
+	{
+		return move(x, Num.ZERO);
+	}
+	
+	
+	public Rect moveY(Num y)
+	{
+		return move(Num.ZERO, y);
+	}
+	
+	
+	public Rect moveX(double x)
+	{
+		return move(x, 0);
+	}
+	
+	
+	public Rect moveY(double y)
+	{
+		return move(0, y);
+	}
+	
+	
+	/**
+	 * Add X and Y to origin
+	 * 
+	 * @param x x to add
+	 * @param y y to add
+	 * @return result
+	 */
+	public Rect move(final double x, final double y)
+	{
+		return new Rect() {
+			
+			private final Rect t = Rect.this;
+			
+			
+			@Override
+			public Vect size()
+			{
+				return t.size();
+			}
+			
+			
+			@Override
+			public Vect origin()
+			{
+				return t.origin().add(x, y);
+			}
+			
+		};
+	}
+	
+	
+	public Rect move(final Num x, final Num y)
+	{
+		return new Rect() {
+			
+			private final Rect t = Rect.this;
+			
+			
+			@Override
+			public Vect size()
+			{
+				return t.size();
+			}
+			
+			
+			@Override
+			public Vect origin()
+			{
+				return t.origin().add(x, y);
+			}
+			
+		};
+	}
+	
+	
+	/**
+	 * Shrink to sides
+	 * 
+	 * @param shrink shrink size (horizontal and vertical)
+	 * @return result
+	 */
+	
+	public Rect shrink(Vect shrink)
+	{
+		return shrink(shrink.x(), shrink.y());
+	}
+	
+	
+	/**
+	 * Shrink to all sides
+	 * 
+	 * @param shrink shrink
+	 * @return result
+	 */
+	public final Rect shrink(double shrink)
+	{
+		return shrink(shrink, shrink, shrink, shrink);
+	}
+	
+	
+	/**
+	 * Shrink to all sides
+	 * 
+	 * @param shrink shrink
+	 * @return result
+	 */
+	public final Rect shrink(Num shrink)
+	{
+		return shrink(shrink, shrink, shrink, shrink);
+	}
+	
+	
+	/**
+	 * Shrink to sides at sides
+	 * 
+	 * @param x horizontal shrink
+	 * @param y vertical shrink
+	 * @return result
+	 */
+	public Rect shrink(double x, double y)
+	{
+		return shrink(x, x, y, y);
+	}
+	
+	
+	/**
+	 * Shrink the rect
+	 * 
+	 * @param left shrink
+	 * @param right shrink
+	 * @param top shrink
+	 * @param bottom shrink
+	 * @return result
+	 */
+	public Rect shrink(final double left, final double right, final double top, final double bottom)
+	{
+		return grow(-left, -right, -top, -bottom);
+	}
+	
+	
+	public Rect shrinkLeft(final double shrink)
+	{
+		return growLeft(-shrink);
+	}
+	
+	
+	public Rect shrinkRight(final double shrink)
+	{
+		return growLeft(-shrink);
+	}
+	
+	
+	public Rect shrinkTop(final double shrink)
+	{
+		return growUp(-shrink);
+	}
+	
+	
+	public Rect shrinkBottom(final double shrink)
+	{
+		return growDown(-shrink);
+	}
+	
+	
+	public Rect growLeft(final double shrink)
+	{
+		return grow(shrink, 0, 0, 0);
+	}
+	
+	
+	public Rect growRight(final double shrink)
+	{
+		return grow(0, shrink, 0, 0);
+	}
+	
+	
+	public Rect growUp(final double shrink)
+	{
+		return grow(0, 0, shrink, 0);
+	}
+	
+	
+	public Rect growDown(final double shrink)
+	{
+		return grow(0, 0, 0, shrink);
+	}
+	
+	
+	public Rect shrinkLeft(final Num shrink)
+	{
+		return shrink(shrink, Num.ZERO, Num.ZERO, Num.ZERO);
+	}
+	
+	
+	public Rect shrinkRight(final Num shrink)
+	{
+		return shrink(Num.ZERO, shrink, Num.ZERO, Num.ZERO);
+	}
+	
+	
+	public Rect shrinkTop(final Num shrink)
+	{
+		return shrink(Num.ZERO, Num.ZERO, shrink, Num.ZERO);
+	}
+	
+	
+	public Rect shrinkBottom(final Num shrink)
+	{
+		return shrink(Num.ZERO, Num.ZERO, Num.ZERO, shrink);
+	}
+	
+	
+	public Rect growLeft(final Num shrink)
+	{
+		return grow(shrink, Num.ZERO, Num.ZERO, Num.ZERO);
+	}
+	
+	
+	public Rect growRight(final Num shrink)
+	{
+		return grow(Num.ZERO, shrink, Num.ZERO, Num.ZERO);
+	}
+	
+	
+	public Rect growUp(final Num shrink)
+	{
+		return grow(Num.ZERO, Num.ZERO, shrink, Num.ZERO);
+	}
+	
+	
+	public Rect growDown(final Num shrink)
+	{
+		return grow(Num.ZERO, Num.ZERO, Num.ZERO, shrink);
+	}
+	
+	
+	/**
+	 * Grow to sides
+	 * 
+	 * @param grow grow size (added to each side)
+	 * @return grown copy
+	 */
+	public final Rect grow(Vect grow)
+	{
+		return grow(grow.x(), grow.y());
+	}
+	
+	
+	/**
+	 * Grow to all sides
+	 * 
+	 * @param grow grow
+	 * @return result
+	 */
+	public final Rect grow(double grow)
+	{
+		return grow(grow, grow, grow, grow);
+	}
+	
+	
+	/**
+	 * Grow to all sides
+	 * 
+	 * @param grow grow
+	 * @return result
+	 */
+	public final Rect grow(Num grow)
+	{
+		return grow(grow, grow, grow, grow);
+	}
+	
+	
+	/**
+	 * Grow to sides
+	 * 
+	 * @param x horizontal grow
+	 * @param y vertical grow
+	 * @return result
+	 */
+	public final Rect grow(double x, double y)
+	{
+		return grow(x, x, y, y);
+	}
+	
+	
+	/**
+	 * Grow the rect
+	 * 
+	 * @param left growth
+	 * @param right growth
+	 * @param top growth
+	 * @param bottom growth
+	 * @return result
+	 */
+	public Rect grow(final double left, final double right, final double top, final double bottom)
+	{
+		return new Rect() {
+			
+			private final Rect t = Rect.this;
+			
+			
+			@Override
+			public Vect size()
+			{
+				return t.size().add(left + right, top + bottom);
+			}
+			
+			
+			@Override
+			public Vect origin()
+			{
+				return t.origin().sub(left, top);
+			}
+			
+		};
+	}
+	
+	
+	public Rect shrink(final Num left, final Num right, final Num top, final Num bottom)
+	{
+		return new Rect() {
+			
+			private final Rect t = Rect.this;
+			
+			
+			@Override
+			public Vect size()
+			{
+				return t.size().sub(left.add(right), top.add(bottom));
+			}
+			
+			
+			@Override
+			public Vect origin()
+			{
+				return t.origin().add(left, top);
+			}
+			
+		};
+	}
+	
+	
+	public Rect grow(final Num left, final Num right, final Num top, final Num bottom)
+	{
+		
+		return new Rect() {
+			
+			private final Rect t = Rect.this;
+			
+			
+			@Override
+			public Vect size()
+			{
+				return t.size().add(left.add(right), top.add(bottom));
+			}
+			
+			
+			@Override
+			public Vect origin()
+			{
+				return t.origin().sub(left, top);
+			}
+			
+		};
+	}
+	
+	
+	/**
+	 * Round coords
+	 * 
+	 * @return result
+	 */
+	public Rect round()
+	{
+		
+		return new Rect() {
+			
+			private final Rect t = Rect.this;
+			
+			
+			@Override
+			public Vect size()
+			{
+				return t.size().round();
+			}
+			
+			
+			@Override
+			public Vect origin()
+			{
+				return t.origin().round();
+			}
+			
+		};
+	}
+	
+	
+	public Num x()
+	{
+		return p_x != null ? p_x : (p_x = origin().xn());
+	}
+	
+	
+	public Num y()
+	{
+		return p_y != null ? p_y : (p_y = origin().yn());
+	}
+	
+	
+	public Num width()
+	{
+		return p_w != null ? p_w : (p_w = size().xn());
+	}
+	
+	
+	public Num height()
+	{
+		return p_h != null ? p_h : (p_h = size().yn());
+	}
+	
+	
+	public Num left()
+	{
+		return p_l != null ? p_l : (p_l = origin().xn());
+	}
+	
+	
+	public Num right()
+	{
+		return p_r != null ? p_r : (p_r = origin().xn().add(size().xn()));
+	}
+	
+	
+	public Num top()
+	{
+		return p_t != null ? p_t : (p_t = origin().yn());
+	}
+	
+	
+	public Num bottom()
+	{
+		return p_b != null ? p_b : (p_b = origin().yn().add(size().yn()));
+	}
+	
+	
+	public Vect topLeft()
+	{
+		return origin();
+	}
+	
+	
+	public Vect topCenter()
+	{
+		return p_tc != null ? p_tc : (p_tc = origin().add(size().xn().half(), Num.ZERO));
+	}
+	
+	
+	public Vect topRight()
+	{
+		return p_tr != null ? p_tr : (p_tr = origin().add(size().xn(), Num.ZERO));
+	}
+	
+	
+	public Vect centerLeft()
+	{
+		return p_cl != null ? p_cl : (p_cl = origin().add(Num.ZERO, size().yn().half()));
+	}
+	
+	
+	public Vect center()
+	{
+		return p_cc != null ? p_cc : (p_cc = origin().add(size().half()));
+	}
+	
+	
+	public Vect centerRight()
+	{
+		return p_cr != null ? p_cr : (p_cr = origin().add(size().xn(), size().yn().half()));
+	}
+	
+	
+	public Vect bottomLeft()
+	{
+		return p_bl != null ? p_bl : (p_bl = origin().add(Num.ZERO, size().yn()));
+	}
+	
+	
+	public Vect bottomCenter()
+	{
+		return p_bc != null ? p_bc : (p_bc = origin().add(size().xn().half(), size().yn()));
+	}
+	
+	
+	public Vect bottomRight()
+	{
+		return p_br != null ? p_br : (p_br = origin().add(size().xn(), size().yn()));
+	}
+	
+	
+	public Rect leftEdge()
+	{
+		return p_edge_l != null ? p_edge_l : (p_edge_l = topLeft().expand(Num.ZERO, Num.ZERO, Num.ZERO, height()));
+	}
+	
+	
+	public Rect rightEdge()
+	{
+		return p_edge_r != null ? p_edge_r : (p_edge_r = topRight().expand(Num.ZERO, Num.ZERO, Num.ZERO, height()));
+	}
+	
+	
+	public Rect topEdge()
+	{
+		return p_edge_t != null ? p_edge_t : (p_edge_t = topLeft().expand(Num.ZERO, width(), Num.ZERO, Num.ZERO));
+	}
+	
+	
+	public Rect bottomEdge()
+	{
+		return p_edge_b != null ? p_edge_b : (p_edge_b = bottomLeft().expand(Num.ZERO, width(), Num.ZERO, Num.ZERO));
+	}
+	
+	
+	/**
+	 * Center to given point
+	 * 
+	 * @param point new center
+	 * @return centered
+	 */
+	public Rect centerTo(final Vect point)
+	{
+		return new Rect() {
+			
+			Rect t = Rect.this;
+			
+			
+			@Override
+			public Vect size()
+			{
+				return t.size();
+			}
+			
+			
+			@Override
+			public Vect origin()
+			{
+				return point.sub(t.size().half());
+			}
+		};
+	}
+	
+	
+	/**
+	 * Check if point is inside this rectangle
+	 * 
+	 * @param point point to test
+	 * @return is inside
+	 */
+	public boolean contains(Vect point)
+	{
+		final double x = point.x();
+		final double y = point.y();
+		
+		final double x1 = origin().x();
+		final double y1 = origin().y();
+		final double x2 = x1 + size().x();
+		final double y2 = y1 + size().y();
+		
+		return x >= x1 && y >= y1 && x <= x2 && y <= y2;
+	}
+	
+	
+	/**
+	 * Center to given rect's center
+	 * 
+	 * @param parent rect to center to
+	 * @return centered
+	 */
+	public Rect centerTo(Rect parent)
+	{
+		return centerTo(parent.center());
+	}
+	
+	
+	/**
+	 * Get TiledRect with given number of evenly spaced tiles. Tile indexes are
+	 * one-based by default.
+	 * 
+	 * @param horizontal horizontal tile count
+	 * @param vertical vertical tile count
+	 * @return tiled rect
+	 */
+	public TiledRect tiles(int horizontal, int vertical)
+	{
+		return new TiledRect(this, horizontal, vertical);
+	}
+	
+	
+	/**
+	 * Get TiledRect with N columns and 1 row. Column indexes are one-based by
+	 * default.
+	 * 
+	 * @param columns number of columns
+	 * @return tiled rect
+	 */
+	public TiledRect columns(int columns)
+	{
+		return new TiledRect(this, columns, 1);
+	}
+	
+	
+	/**
+	 * Get TiledRect with N rows and 1 column. Row indexes are one-based by
+	 * default.
+	 * 
+	 * @param rows number of columns
+	 * @return tiled rect
+	 */
+	public TiledRect rows(int rows)
+	{
+		return new TiledRect(this, 1, rows);
+	}
+}

src/mightypork/util/math/constraints/rect/RectConst.java

@@ -0,0 +1,440 @@
+package mightypork.util.math.constraints.rect;
+
+
+import mightypork.util.math.constraints.num.NumConst;
+import mightypork.util.math.constraints.rect.caching.RectDigest;
+import mightypork.util.math.constraints.vect.Vect;
+import mightypork.util.math.constraints.vect.VectConst;
+
+
+/**
+ * Rectangle with constant bounds, that can never change.<br>
+ * It's arranged so that operations with constant arguments yield constant
+ * results.
+ * 
+ * @author MightyPork
+ */
+public class RectConst extends Rect {
+	
+	private final VectConst pos;
+	private final VectConst size;
+	
+	// cached with lazy loading
+	private NumConst v_b;
+	private NumConst v_r;
+	private VectConst v_br;
+	private VectConst v_tc;
+	private VectConst v_tr;
+	private VectConst v_cl;
+	private VectConst v_c;
+	private VectConst v_cr;
+	private VectConst v_bl;
+	private VectConst v_bc;
+	private RectConst v_round;
+	private RectConst v_edge_l;
+	private RectConst v_edge_r;
+	private RectConst v_edge_t;
+	private RectConst v_edge_b;
+	private RectDigest digest;
+	
+	
+	/**
+	 * Create at given origin, with given size.
+	 * 
+	 * @param x
+	 * @param y
+	 * @param width
+	 * @param height
+	 */
+	RectConst(double x, double y, double width, double height) {
+		this.pos = Vect.make(x, y);
+		this.size = Vect.make(width, height);
+	}
+	
+	
+	/**
+	 * Create at given origin, with given size.
+	 * 
+	 * @param origin
+	 * @param size
+	 */
+	RectConst(Vect origin, Vect size) {
+		this.pos = origin.freeze();
+		this.size = size.freeze();
+	}
+	
+	
+	/**
+	 * Create at given origin, with given size.
+	 * 
+	 * @param another other coord
+	 */
+	RectConst(Rect another) {
+		this.pos = another.origin().freeze();
+		this.size = another.size().freeze();
+	}
+	
+	
+	/**
+	 * @deprecated it's useless to copy a constant
+	 */
+	@Override
+	@Deprecated
+	public RectConst freeze()
+	{
+		return this; // already constant
+	}
+	
+	
+	@Override
+	public RectDigest digest()
+	{
+		return (digest != null) ? digest : (digest = super.digest());
+	}
+	
+	
+	@Override
+	public VectConst origin()
+	{
+		return pos;
+	}
+	
+	
+	@Override
+	public VectConst size()
+	{
+		return size;
+	}
+	
+	
+	@Override
+	public RectConst move(Vect move)
+	{
+		return move(move.x(), move.y());
+	}
+	
+	
+	@Override
+	public RectConst move(double x, double y)
+	{
+		return Rect.make(pos.add(x, y), size);
+	}
+	
+	
+	public RectConst move(NumConst x, NumConst y)
+	{
+		return super.move(x, y).freeze();
+	}
+	
+	
+	@Override
+	public RectConst shrink(double left, double right, double top, double bottom)
+	{
+		return super.shrink(left, right, top, bottom).freeze();
+		
+	}
+	
+	
+	@Override
+	public RectConst grow(double left, double right, double top, double bottom)
+	{
+		return super.grow(left, right, top, bottom).freeze();
+	}
+	
+	
+	@Override
+	public RectConst round()
+	{
+		return (v_round != null) ? v_round : (v_round = Rect.make(pos.round(), size.round()));
+	}
+	
+	
+	@Override
+	public NumConst x()
+	{
+		return pos.xn();
+	}
+	
+	
+	@Override
+	public NumConst y()
+	{
+		return pos.yn();
+	}
+	
+	
+	@Override
+	public NumConst width()
+	{
+		return size.xn();
+	}
+	
+	
+	@Override
+	public NumConst height()
+	{
+		return size.yn();
+	}
+	
+	
+	@Override
+	public NumConst left()
+	{
+		return pos.xn();
+	}
+	
+	
+	@Override
+	public NumConst right()
+	{
+		return (v_r != null) ? v_r : (v_r = super.right().freeze());
+	}
+	
+	
+	@Override
+	public NumConst top()
+	{
+		return pos.yn();
+	}
+	
+	
+	@Override
+	public NumConst bottom()
+	{
+		return (v_b != null) ? v_b : (v_b = super.bottom().freeze());
+	}
+	
+	
+	@Override
+	public VectConst topLeft()
+	{
+		return pos;
+	}
+	
+	
+	@Override
+	public VectConst topCenter()
+	{
+		return (v_tc != null) ? v_tc : (v_tc = super.topCenter().freeze());
+	}
+	
+	
+	@Override
+	public VectConst topRight()
+	{
+		return (v_tr != null) ? v_tr : (v_tr = super.topRight().freeze());
+	}
+	
+	
+	@Override
+	public VectConst centerLeft()
+	{
+		return (v_cl != null) ? v_cl : (v_cl = super.centerLeft().freeze());
+	}
+	
+	
+	@Override
+	public VectConst center()
+	{
+		return (v_c != null) ? v_c : (v_c = super.center().freeze());
+	}
+	
+	
+	@Override
+	public VectConst centerRight()
+	{
+		return (v_cr != null) ? v_cr : (v_cr = super.centerRight().freeze());
+	}
+	
+	
+	@Override
+	public VectConst bottomLeft()
+	{
+		return (v_bl != null) ? v_bl : (v_bl = super.bottomLeft().freeze());
+	}
+	
+	
+	@Override
+	public VectConst bottomCenter()
+	{
+		return (v_bc != null) ? v_bc : (v_bc = super.bottomCenter().freeze());
+	}
+	
+	
+	@Override
+	public VectConst bottomRight()
+	{
+		return (v_br != null) ? v_br : (v_br = super.bottomRight().freeze());
+	}
+	
+	
+	@Override
+	public RectConst leftEdge()
+	{
+		return (v_edge_l != null) ? v_edge_l : (v_edge_l = super.leftEdge().freeze());
+	}
+	
+	
+	@Override
+	public RectConst rightEdge()
+	{
+		return (v_edge_r != null) ? v_edge_r : (v_edge_r = super.rightEdge().freeze());
+	}
+	
+	
+	@Override
+	public RectConst topEdge()
+	{
+		return (v_edge_t != null) ? v_edge_t : (v_edge_t = super.topEdge().freeze());
+	}
+	
+	
+	@Override
+	public RectConst bottomEdge()
+	{
+		return (v_edge_b != null) ? v_edge_b : (v_edge_b = super.bottomEdge().freeze());
+	}
+	
+	
+	@Override
+	public Rect shrink(Vect shrink)
+	{
+		return super.shrink(shrink);
+	}
+	
+	
+	@Override
+	public RectConst shrink(double x, double y)
+	{
+		return super.shrink(x, y).freeze();
+	}
+	
+	
+	public RectConst shrink(NumConst left, NumConst right, NumConst top, NumConst bottom)
+	{
+		return super.shrink(left, right, top, bottom).freeze();
+	}
+	
+	
+	public RectConst grow(NumConst left, NumConst right, NumConst top, NumConst bottom)
+	{
+		return super.grow(left, right, top, bottom).freeze();
+	}
+	
+	
+	@Override
+	public RectConst shrinkLeft(double shrink)
+	{
+		return super.shrinkLeft(shrink).freeze();
+	}
+	
+	
+	@Override
+	public RectConst shrinkRight(double shrink)
+	{
+		return super.shrinkRight(shrink).freeze();
+	}
+	
+	
+	@Override
+	public RectConst shrinkTop(double shrink)
+	{
+		return super.shrinkTop(shrink).freeze();
+	}
+	
+	
+	@Override
+	public RectConst shrinkBottom(double shrink)
+	{
+		return super.shrinkBottom(shrink).freeze();
+	}
+	
+	
+	@Override
+	public RectConst growLeft(double shrink)
+	{
+		return super.growLeft(shrink).freeze();
+	}
+	
+	
+	@Override
+	public RectConst growRight(double shrink)
+	{
+		return super.growRight(shrink).freeze();
+	}
+	
+	
+	@Override
+	public RectConst growUp(double shrink)
+	{
+		return super.growUp(shrink).freeze();
+	}
+	
+	
+	@Override
+	public RectConst growDown(double shrink)
+	{
+		return super.growDown(shrink).freeze();
+	}
+	
+	
+	public RectConst shrinkLeft(NumConst shrink)
+	{
+		return super.shrinkLeft(shrink).freeze();
+	}
+	
+	
+	public RectConst shrinkRight(NumConst shrink)
+	{
+		return super.shrinkRight(shrink).freeze();
+	}
+	
+	
+	public RectConst shrinkTop(NumConst shrink)
+	{
+		return super.shrinkTop(shrink).freeze();
+	}
+	
+	
+	public RectConst shrinkBottom(NumConst shrink)
+	{
+		return super.shrinkBottom(shrink).freeze();
+	}
+	
+	
+	public RectConst growLeft(NumConst shrink)
+	{
+		return super.growLeft(shrink).freeze();
+	}
+	
+	
+	public RectConst growRight(NumConst shrink)
+	{
+		return super.growRight(shrink).freeze();
+	}
+	
+	
+	public RectConst growUp(NumConst shrink)
+	{
+		return super.growUp(shrink).freeze();
+	}
+	
+	
+	public RectConst growBottom(NumConst shrink)
+	{
+		return super.growDown(shrink).freeze();
+	}
+	
+	
+	public RectConst centerTo(VectConst point)
+	{
+		return super.centerTo(point).freeze();
+	}
+	
+	
+	public RectConst centerTo(RectConst parent)
+	{
+		return super.centerTo(parent).freeze();
+	}
+	
+}

src/mightypork/util/math/constraints/rect/builders/TiledRect.java

@@ -0,0 +1,149 @@
+package mightypork.util.math.constraints.rect.builders;
+
+
+import mightypork.util.math.constraints.num.Num;
+import mightypork.util.math.constraints.rect.Rect;
+import mightypork.util.math.constraints.rect.proxy.RectProxy;
+
+
+/**
+ * Utility for cutting rect into evenly sized cells.<br>
+ * It's by default one-based, but this can be switched by calling the oneBased()
+ * and zeroBased() methods.
+ * 
+ * @author MightyPork
+ */
+public class TiledRect extends RectProxy {
+	
+	final private int tilesY;
+	final private int tilesX;
+	final private Num perRow;
+	final private Num perCol;
+	
+	private int based = 1;
+	
+	
+	public TiledRect(Rect source, int horizontal, int vertical) {
+		super(source);
+		this.tilesX = horizontal;
+		this.tilesY = vertical;
+		
+		this.perRow = height().div(vertical);
+		this.perCol = width().div(horizontal);
+	}
+	
+	
+	/**
+	 * Set to one-based mode, and return itself (for chaining).
+	 * 
+	 * @return this
+	 */
+	public TiledRect oneBased()
+	{
+		based = 1;
+		return this;
+	}
+	
+	
+	/**
+	 * Set to zero-based mode, and return itself (for chaining).
+	 * 
+	 * @return this
+	 */
+	public TiledRect zeroBased()
+	{
+		based = 0;
+		return this;
+	}
+	
+	
+	/**
+	 * Get a tile.
+	 * 
+	 * @param x x position
+	 * @param y y position
+	 * @return tile
+	 * @throws IndexOutOfBoundsException when invalid index is specified.
+	 */
+	public Rect tile(int x, int y)
+	{
+		x -= based;
+		y -= based;
+		
+		if (x >= tilesX || x < 0) {
+			throw new IndexOutOfBoundsException("X coordinate out fo range.");
+		}
+		
+		if (y >= tilesY || y < 0) {
+			throw new IndexOutOfBoundsException("Y coordinate out of range.");
+		}
+		
+		final Num leftMove = left().add(perCol.mul(x));
+		final Num topMove = top().add(perRow.mul(y));
+		
+		return Rect.make(perCol, perRow).move(leftMove, topMove);
+	}
+	
+	
+	/**
+	 * Get a span (tile spanning across multiple cells)
+	 * 
+	 * @param x_from x start position
+	 * @param y_from y start position
+	 * @param size_x horizontal size (columns)
+	 * @param size_y vertical size (rows)
+	 * @return tile the tile
+	 * @throws IndexOutOfBoundsException when invalid index is specified.
+	 */
+	public Rect span(int x_from, int y_from, int size_x, int size_y)
+	{
+		x_from -= based;
+		y_from -= based;
+		
+		final int x_to = x_from + size_x;
+		final int y_to = y_from + size_y;
+		
+		if (size_x <= 0 || size_y <= 0) {
+			throw new IndexOutOfBoundsException("Size must be > 0.");
+		}
+		
+		if (x_from >= tilesX || x_from < 0 || x_to >= tilesX || x_to < 0) {
+			throw new IndexOutOfBoundsException("X coordinate(s) out of range.");
+		}
+		
+		if (y_from >= tilesY || y_from < 0 || y_to >= tilesY || y_to < 0) {
+			throw new IndexOutOfBoundsException("Y coordinate(s) out of range.");
+		}
+		
+		final Num leftMove = left().add(perCol.mul(x_from));
+		final Num topMove = top().add(perRow.mul(y_from));
+		
+		return Rect.make(perCol.mul(size_x), perRow.mul(size_y)).move(leftMove, topMove);
+	}
+	
+	
+	/**
+	 * Get n-th column
+	 * 
+	 * @param n column index
+	 * @return the column tile
+	 * @throws IndexOutOfBoundsException when invalid index is specified.
+	 */
+	public Rect column(int n)
+	{
+		return tile(n, based);
+	}
+	
+	
+	/**
+	 * Get n-th row
+	 * 
+	 * @param n row index
+	 * @return the row rect
+	 * @throws IndexOutOfBoundsException when invalid index is specified.
+	 */
+	public Rect row(int n)
+	{
+		return tile(based, n);
+	}
+}

src/mightypork/util/math/constraints/rect/caching/AbstractRectCache.java

@@ -0,0 +1,74 @@
+package mightypork.util.math.constraints.rect.caching;
+
+
+import mightypork.util.math.constraints.ConstraintCache;
+import mightypork.util.math.constraints.rect.Rect;
+import mightypork.util.math.constraints.rect.mutable.RectVar;
+import mightypork.util.math.constraints.rect.proxy.RectAdapter;
+
+
+/**
+ * <p>
+ * A rect cache.
+ * </p>
+ * <p>
+ * Values are held in a caching VectVar, and digest caching is enabled by
+ * default.
+ * </p>
+ * 
+ * @author MightyPork
+ */
+public abstract class AbstractRectCache extends RectAdapter implements ConstraintCache<Rect> {
+	
+	private final RectVar cache = Rect.makeVar();
+	private boolean inited = false;
+	private boolean cachingEnabled = true;
+	
+	
+	public AbstractRectCache() {
+		enableDigestCaching(true); // it changes only on poll
+	}
+	
+	
+	@Override
+	protected final Rect getSource()
+	{
+		if (!inited) poll();
+		
+		return (cachingEnabled ? cache : getCacheSource());
+	}
+	
+	
+	@Override
+	public final void poll()
+	{
+		inited = true;
+		
+		// poll source
+		final Rect source = getCacheSource();
+		source.markDigestDirty(); // poll cached
+		
+		// store source value
+		cache.setTo(source);
+		
+		markDigestDirty();
+		
+		onChange();
+	}
+	
+	
+	@Override
+	public final void enableCaching(boolean yes)
+	{
+		cachingEnabled = yes;
+		enableDigestCaching(yes);
+	}
+	
+	
+	@Override
+	public final boolean isCachingEnabled()
+	{
+		return cachingEnabled;
+	}
+	
+}

src/mightypork/util/math/constraints/rect/caching/RectCache.java

@@ -0,0 +1,36 @@
+package mightypork.util.math.constraints.rect.caching;
+
+
+import mightypork.util.annotations.DefaultImpl;
+import mightypork.util.math.constraints.rect.Rect;
+
+
+/**
+ * Rect cache implementation
+ * 
+ * @author MightyPork
+ */
+public class RectCache extends AbstractRectCache {
+	
+	private final Rect source;
+	
+	
+	public RectCache(Rect source) {
+		this.source = source;
+	}
+	
+	
+	@Override
+	public final Rect getCacheSource()
+	{
+		return source;
+	}
+	
+	
+	@Override
+	@DefaultImpl
+	public void onChange()
+	{
+	}
+	
+}

src/mightypork/util/math/constraints/rect/caching/RectDigest.java

@@ -0,0 +1,43 @@
+package mightypork.util.math.constraints.rect.caching;
+
+
+import mightypork.util.math.constraints.rect.Rect;
+import mightypork.util.math.constraints.rect.RectConst;
+
+
+public class RectDigest {
+	
+	public final double x;
+	public final double y;
+	public final double width;
+	public final double height;
+	
+	public final double left;
+	public final double right;
+	public final double top;
+	public final double bottom;
+	
+	
+	public RectDigest(Rect rect) {
+		
+		final RectConst frozen = rect.freeze();
+		
+		this.x = frozen.x().value();
+		this.y = frozen.y().value();
+		
+		this.width = frozen.width().value();
+		this.height = frozen.height().value();
+		
+		this.left = frozen.left().value();
+		this.right = frozen.right().value();
+		this.top = frozen.top().value();
+		this.bottom = frozen.bottom().value();
+	}
+	
+	
+	@Override
+	public String toString()
+	{
+		return String.format("Rect{ at: (%.1f, %.1f), size: (%.1f, %.1f), bounds: L %.1f R %.1f T %.1f B %.1f }", x, y, width, height, left, right, top, bottom);
+	}
+}

src/mightypork/util/math/constraints/rect/mutable/RectMutable.java

@@ -0,0 +1,90 @@
+package mightypork.util.math.constraints.rect.mutable;
+
+
+import mightypork.util.math.constraints.rect.Rect;
+import mightypork.util.math.constraints.vect.Vect;
+
+
+/**
+ * Mutable rectangle; operations change it's state.
+ * 
+ * @author MightyPork
+ */
+public abstract class RectMutable extends Rect {
+	
+	/**
+	 * Set to other rect's coordinates
+	 * 
+	 * @param rect other rect
+	 */
+	public void setTo(Rect rect)
+	{
+		setTo(rect.origin(), rect.size());
+	}
+	
+	
+	/**
+	 * Set to given size and position
+	 * 
+	 * @param origin new origin
+	 * @param width new width
+	 * @param height new height
+	 */
+	public void setTo(Vect origin, double width, double height)
+	{
+		setTo(origin, Vect.make(width, height));
+	}
+	
+	
+	/**
+	 * Set to given size and position
+	 * 
+	 * @param x origin.x
+	 * @param y origin.y
+	 * @param width new width
+	 * @param height new height
+	 */
+	public void setTo(double x, double y, double width, double height)
+	{
+		setTo(Vect.make(x, y), Vect.make(width, height));
+	}
+	
+	
+	/**
+	 * Set to given size and position
+	 * 
+	 * @param origin new origin
+	 * @param size new size
+	 */
+	public void setTo(Vect origin, Vect size)
+	{
+		setOrigin(origin);
+		setSize(size);
+	}
+	
+	
+	/**
+	 * Set to zero
+	 */
+	public void reset()
+	{
+		setTo(Vect.ZERO, Vect.ZERO);
+	}
+	
+	
+	/**
+	 * Set new origin
+	 * 
+	 * @param origin new origin
+	 */
+	public abstract void setOrigin(Vect origin);
+	
+	
+	/**
+	 * Set new size
+	 * 
+	 * @param size new size
+	 */
+	public abstract void setSize(Vect size);
+	
+}

src/mightypork/util/math/constraints/rect/mutable/RectVar.java

@@ -0,0 +1,54 @@
+package mightypork.util.math.constraints.rect.mutable;
+
+
+import mightypork.util.math.constraints.vect.Vect;
+import mightypork.util.math.constraints.vect.mutable.VectVar;
+
+
+public class RectVar extends RectMutable {
+	
+	final VectVar pos = Vect.makeVar();
+	final VectVar size = Vect.makeVar();
+	
+	
+	/**
+	 * Create at given origin, with given size.
+	 * 
+	 * @param x
+	 * @param y
+	 * @param width
+	 * @param height
+	 */
+	public RectVar(double x, double y, double width, double height) {
+		this.pos.setTo(x, y);
+		this.size.setTo(width, height);
+	}
+	
+	
+	@Override
+	public Vect origin()
+	{
+		return pos;
+	}
+	
+	
+	@Override
+	public Vect size()
+	{
+		return size;
+	}
+	
+	
+	@Override
+	public void setOrigin(Vect origin)
+	{
+		this.pos.setTo(origin);
+	}
+	
+	
+	@Override
+	public void setSize(Vect size)
+	{
+		this.size.setTo(size);
+	}
+}

src/mightypork/util/math/constraints/rect/proxy/PluggableRectBound.java

@@ -0,0 +1,16 @@
+package mightypork.util.math.constraints.rect.proxy;
+
+
+/**
+ * Pluggable rect bound
+ * 
+ * @author MightyPork
+ */
+public interface PluggableRectBound extends RectBound {
+	
+	/**
+	 * @param rect context to set
+	 */
+	abstract void setRect(RectBound rect);
+	
+}

src/mightypork/util/math/constraints/rect/proxy/RectAdapter.java

@@ -0,0 +1,58 @@
+package mightypork.util.math.constraints.rect.proxy;
+
+
+import mightypork.util.math.constraints.rect.Rect;
+import mightypork.util.math.constraints.vect.Vect;
+import mightypork.util.math.constraints.vect.proxy.VectAdapter;
+
+
+/**
+ * Rect proxy with abstract method for plugging in / generating rect
+ * dynamically.
+ * 
+ * @author MightyPork
+ */
+public abstract class RectAdapter extends Rect {
+	
+	// adapters are needed in case the vect returned from source changes
+	// (is replaced). This way, references to origin and rect will stay intact.
+	
+	private final VectAdapter originAdapter = new VectAdapter() {
+		
+		@Override
+		protected Vect getSource()
+		{
+			return RectAdapter.this.getSource().origin();
+		}
+	};
+	
+	private final VectAdapter sizeAdapter = new VectAdapter() {
+		
+		@Override
+		protected Vect getSource()
+		{
+			return RectAdapter.this.getSource().size();
+		}
+	};
+	
+	
+	/**
+	 * @return the proxied coord
+	 */
+	protected abstract Rect getSource();
+	
+	
+	@Override
+	public Vect origin()
+	{
+		return originAdapter;
+	}
+	
+	
+	@Override
+	public Vect size()
+	{
+		return sizeAdapter;
+	}
+	
+}

src/mightypork/util/math/constraints/rect/proxy/RectBound.java

@@ -0,0 +1,18 @@
+package mightypork.util.math.constraints.rect.proxy;
+
+
+import mightypork.util.math.constraints.rect.Rect;
+
+
+/**
+ * Rect constraint (ie. region)
+ * 
+ * @author MightyPork
+ */
+public interface RectBound {
+	
+	/**
+	 * @return rect region
+	 */
+	Rect getRect();
+}

src/mightypork/util/math/constraints/rect/proxy/RectBoundAdapter.java

@@ -0,0 +1,39 @@
+package mightypork.util.math.constraints.rect.proxy;
+
+
+import mightypork.util.math.constraints.rect.Rect;
+
+
+/**
+ * Pluggable rect bound adapter
+ * 
+ * @author MightyPork
+ */
+public class RectBoundAdapter extends RectAdapter implements PluggableRectBound {
+	
+	private RectBound backing = null;
+	
+	
+	public RectBoundAdapter() {
+	}
+	
+	
+	public RectBoundAdapter(RectBound bound) {
+		backing = bound;
+	}
+	
+	
+	@Override
+	public void setRect(RectBound rect)
+	{
+		this.backing = rect;
+	}
+	
+	
+	@Override
+	public Rect getSource()
+	{
+		return backing.getRect();
+	}
+	
+}

src/mightypork/util/math/constraints/rect/proxy/RectProxy.java

@@ -0,0 +1,23 @@
+package mightypork.util.math.constraints.rect.proxy;
+
+
+import mightypork.util.math.constraints.rect.Rect;
+
+
+public class RectProxy extends RectAdapter {
+	
+	private final Rect source;
+	
+	
+	public RectProxy(Rect source) {
+		this.source = source;
+	}
+	
+	
+	@Override
+	protected Rect getSource()
+	{
+		return source;
+	}
+	
+}

src/mightypork/util/math/constraints/rect/proxy/RectVectAdapter.java

@@ -0,0 +1,38 @@
+package mightypork.util.math.constraints.rect.proxy;
+
+
+import mightypork.util.math.constraints.rect.Rect;
+import mightypork.util.math.constraints.vect.Vect;
+
+
+/**
+ * Rect made of two {@link Vect}s
+ * 
+ * @author MightyPork
+ */
+public class RectVectAdapter extends Rect {
+	
+	private final Vect origin;
+	private final Vect size;
+	
+	
+	public RectVectAdapter(Vect origin, Vect size) {
+		this.origin = origin;
+		this.size = size;
+	}
+	
+	
+	@Override
+	public Vect origin()
+	{
+		return origin;
+	}
+	
+	
+	@Override
+	public Vect size()
+	{
+		return size;
+	}
+	
+}

src/mightypork/util/math/constraints/vect/VectConst.java

@@ -0,0 +1,373 @@
+package mightypork.util.math.constraints.vect;
+
+
+import mightypork.util.math.constraints.num.Num;
+import mightypork.util.math.constraints.num.NumConst;
+import mightypork.util.math.constraints.rect.RectConst;
+import mightypork.util.math.constraints.vect.caching.VectDigest;
+
+
+/**
+ * Coordinate with immutable numeric values.<br>
+ * This coordinate is guaranteed to never change, as opposed to view.<br>
+ * It's arranged so that operations with constant arguments yield constant
+ * results.
+ * 
+ * @author MightyPork
+ */
+public final class VectConst extends Vect {
+	
+	private final double x, y, z;
+	// non-parametric operations are cached using lazy load.
+	private NumConst v_size;
+	private VectConst v_neg;
+	private VectConst v_ceil;
+	private VectConst v_floor;
+	private VectConst v_round;
+	private VectConst v_half;
+	private VectConst v_abs;
+	private NumConst v_xc;
+	private NumConst v_yc;
+	private NumConst v_zc;
+	private VectDigest digest;
+	
+	
+	VectConst(Vect other) {
+		this(other.x(), other.y(), other.z());
+	}
+	
+	
+	VectConst(double x, double y, double z) {
+		this.x = x;
+		this.y = y;
+		this.z = z;
+	}
+	
+	
+	@Override
+	public double x()
+	{
+		return x;
+	}
+	
+	
+	@Override
+	public double y()
+	{
+		return y;
+	}
+	
+	
+	@Override
+	public double z()
+	{
+		return z;
+	}
+	
+	
+	/**
+	 * @return X constraint
+	 */
+	
+	@Override
+	public final NumConst xn()
+	{
+		return (v_xc != null) ? v_xc : (v_xc = Num.make(this.x));
+	}
+	
+	
+	/**
+	 * @return Y constraint
+	 */
+	
+	@Override
+	public final NumConst yn()
+	{
+		return (v_yc != null) ? v_yc : (v_yc = Num.make(this.y));
+	}
+	
+	
+	/**
+	 * @return Z constraint
+	 */
+	
+	@Override
+	public final NumConst zn()
+	{
+		return (v_zc != null) ? v_zc : (v_zc = Num.make(this.z));
+	}
+	
+	
+	/**
+	 * @deprecated it's useless to copy a constant
+	 */
+	
+	@Override
+	@Deprecated
+	public VectConst freeze()
+	{
+		return this; // it's constant already
+	}
+	
+	
+	@Override
+	public VectDigest digest()
+	{
+		return (digest != null) ? digest : (digest = super.digest());
+	}
+	
+	
+	@Override
+	public VectConst abs()
+	{
+		return (v_abs != null) ? v_abs : (v_abs = super.abs().freeze());
+	}
+	
+	
+	@Override
+	public VectConst add(double x, double y)
+	{
+		return super.add(x, y).freeze();
+	}
+	
+	
+	@Override
+	public VectConst add(double x, double y, double z)
+	{
+		return super.add(x, y, z).freeze();
+	}
+	
+	
+	@Override
+	public VectConst half()
+	{
+		return (v_half != null) ? v_half : (v_half = super.half().freeze());
+	}
+	
+	
+	@Override
+	public VectConst mul(double d)
+	{
+		return super.mul(d).freeze();
+	}
+	
+	
+	@Override
+	public VectConst mul(double x, double y)
+	{
+		return super.mul(x, y).freeze();
+	}
+	
+	
+	@Override
+	public VectConst mul(double x, double y, double z)
+	{
+		return super.mul(x, y, z).freeze();
+	}
+	
+	
+	@Override
+	public VectConst round()
+	{
+		return (v_round != null) ? v_round : (v_round = super.round().freeze());
+	}
+	
+	
+	@Override
+	public VectConst floor()
+	{
+		return (v_floor != null) ? v_floor : (v_floor = super.floor().freeze());
+	}
+	
+	
+	@Override
+	public VectConst ceil()
+	{
+		if (v_ceil != null) return v_ceil;
+		return v_ceil = super.ceil().freeze();
+	}
+	
+	
+	@Override
+	public VectConst sub(double x, double y)
+	{
+		return super.sub(x, y).freeze();
+	}
+	
+	
+	@Override
+	public VectConst sub(double x, double y, double z)
+	{
+		return super.sub(x, y, z).freeze();
+	}
+	
+	
+	@Override
+	public VectConst neg()
+	{
+		return (v_neg != null) ? v_neg : (v_neg = super.neg().freeze());
+	}
+	
+	
+	@Override
+	public VectConst norm(double size)
+	{
+		return super.norm(size).freeze();
+	}
+	
+	
+	@Override
+	public NumConst size()
+	{
+		return (v_size != null) ? v_size : (v_size = super.size().freeze());
+	}
+	
+	
+	@Override
+	public VectConst withX(double x)
+	{
+		return super.withX(x).freeze();
+	}
+	
+	
+	@Override
+	public VectConst withY(double y)
+	{
+		return super.withY(y).freeze();
+	}
+	
+	
+	@Override
+	public VectConst withZ(double z)
+	{
+		return super.withZ(z).freeze();
+	}
+	
+	
+	public VectConst withX(NumConst x)
+	{
+		return super.withX(x).freeze();
+	}
+	
+	
+	public VectConst withY(NumConst y)
+	{
+		return super.withY(y).freeze();
+	}
+	
+	
+	public VectConst withZ(NumConst z)
+	{
+		return super.withZ(z).freeze();
+	}
+	
+	
+	public VectConst add(VectConst vec)
+	{
+		return super.add(vec).freeze();
+	}
+	
+	
+	public VectConst add(NumConst x, NumConst y)
+	{
+		return super.add(x, y).freeze();
+	}
+	
+	
+	public VectConst add(NumConst x, NumConst y, NumConst z)
+	{
+		return super.add(x, y, z).freeze();
+	}
+	
+	
+	public VectConst mul(VectConst vec)
+	{
+		return super.mul(vec).freeze();
+	}
+	
+	
+	public VectConst mul(NumConst d)
+	{
+		return super.mul(d).freeze();
+	}
+	
+	
+	public VectConst mul(NumConst x, NumConst y)
+	{
+		return super.mul(x, y).freeze();
+	}
+	
+	
+	public VectConst mul(NumConst x, NumConst y, NumConst z)
+	{
+		return super.mul(x, y, z).freeze();
+	}
+	
+	
+	public VectConst sub(VectConst vec)
+	{
+		return super.sub(vec).freeze();
+	}
+	
+	
+	public VectConst sub(NumConst x, NumConst y)
+	{
+		return super.sub(x, y).freeze();
+	}
+	
+	
+	public VectConst sub(NumConst x, NumConst y, NumConst z)
+	{
+		return super.sub(x, y, z).freeze();
+	}
+	
+	
+	public VectConst norm(NumConst size)
+	{
+		return super.norm(size).freeze();
+	}
+	
+	
+	public NumConst dist(VectConst point)
+	{
+		return super.dist(point).freeze();
+	}
+	
+	
+	public VectConst midTo(VectConst point)
+	{
+		return super.midTo(point).freeze();
+	}
+	
+	
+	public VectConst vectTo(VectConst point)
+	{
+		return super.vectTo(point).freeze();
+	}
+	
+	
+	public NumConst dot(VectConst vec)
+	{
+		return super.dot(vec).freeze();
+	}
+	
+	
+	public VectConst cross(VectConst vec)
+	{
+		return super.cross(vec).freeze();
+	}
+	
+	
+	@Override
+	public RectConst expand(double left, double right, double top, double bottom)
+	{
+		return super.expand(left, right, top, bottom).freeze();
+	}
+	
+	
+	public RectConst expand(NumConst left, NumConst right, NumConst top, NumConst bottom)
+	{
+		return super.expand(left, right, top, bottom).freeze();
+	}
+	
+}

src/mightypork/util/math/constraints/vect/VectProxy.java

@@ -0,0 +1,23 @@
+package mightypork.util.math.constraints.vect;
+
+
+import mightypork.util.math.constraints.vect.proxy.VectAdapter;
+
+
+public class VectProxy extends VectAdapter {
+	
+	private final Vect source;
+	
+	
+	public VectProxy(Vect source) {
+		this.source = source;
+	}
+	
+	
+	@Override
+	protected Vect getSource()
+	{
+		return source;
+	}
+	
+}

src/mightypork/util/math/constraints/vect/caching/AbstractVectCache.java

@@ -0,0 +1,74 @@
+package mightypork.util.math.constraints.vect.caching;
+
+
+import mightypork.util.math.constraints.ConstraintCache;
+import mightypork.util.math.constraints.vect.Vect;
+import mightypork.util.math.constraints.vect.mutable.VectVar;
+import mightypork.util.math.constraints.vect.proxy.VectAdapter;
+
+
+/**
+ * <p>
+ * A vect cache.
+ * </p>
+ * <p>
+ * Values are held in a caching VectVar, and digest caching is enabled by
+ * default.
+ * </p>
+ * 
+ * @author MightyPork
+ */
+public abstract class AbstractVectCache extends VectAdapter implements ConstraintCache<Vect> {
+	
+	private final VectVar cache = Vect.makeVar();
+	private boolean inited = false;
+	private boolean cachingEnabled = true;
+	
+	
+	public AbstractVectCache() {
+		enableDigestCaching(true); // it changes only on poll
+	}
+	
+	
+	@Override
+	protected final Vect getSource()
+	{
+		if (!inited) markDigestDirty();
+		
+		return (cachingEnabled ? cache : getCacheSource());
+	}
+	
+	
+	@Override
+	public final void poll()
+	{
+		inited = true;
+		
+		// poll source
+		final Vect source = getCacheSource();
+		source.markDigestDirty(); // poll cached
+		
+		// store source value
+		cache.setTo(source);
+		
+		markDigestDirty();
+		
+		onChange();
+	}
+	
+	
+	@Override
+	public final void enableCaching(boolean yes)
+	{
+		cachingEnabled = yes;
+		enableDigestCaching(yes);
+	}
+	
+	
+	@Override
+	public final boolean isCachingEnabled()
+	{
+		return cachingEnabled;
+	}
+	
+}

src/mightypork/util/math/constraints/vect/caching/VectCache.java

@@ -0,0 +1,36 @@
+package mightypork.util.math.constraints.vect.caching;
+
+
+import mightypork.util.annotations.DefaultImpl;
+import mightypork.util.math.constraints.vect.Vect;
+
+
+/**
+ * Vect cache implementation
+ * 
+ * @author MightyPork
+ */
+public class VectCache extends AbstractVectCache {
+	
+	private final Vect source;
+	
+	
+	public VectCache(Vect source) {
+		this.source = source;
+		enableDigestCaching(true);
+	}
+	
+	
+	@Override
+	public Vect getCacheSource()
+	{
+		return source;
+	}
+	
+	
+	@Override
+	@DefaultImpl
+	public void onChange()
+	{
+	}
+}

src/mightypork/util/math/constraints/vect/caching/VectDigest.java

@@ -0,0 +1,26 @@
+package mightypork.util.math.constraints.vect.caching;
+
+
+import mightypork.util.math.constraints.vect.Vect;
+
+
+public class VectDigest {
+	
+	public final double x;
+	public final double y;
+	public final double z;
+	
+	
+	public VectDigest(Vect vect) {
+		this.x = vect.x();
+		this.y = vect.y();
+		this.z = vect.z();
+	}
+	
+	
+	@Override
+	public String toString()
+	{
+		return String.format("Vect(%.1f, %.1f, %.1f)", x, y, z);
+	}
+}

src/mightypork/util/math/constraints/vect/mutable/VectAnimated.java

@@ -0,0 +1,291 @@
+package mightypork.util.math.constraints.vect.mutable;
+
+
+import mightypork.util.annotations.FactoryMethod;
+import mightypork.util.control.timing.Pauseable;
+import mightypork.util.control.timing.Updateable;
+import mightypork.util.math.Easing;
+import mightypork.util.math.constraints.num.mutable.NumAnimated;
+import mightypork.util.math.constraints.vect.Vect;
+
+
+/**
+ * 3D coordinated with support for transitions, mutable.
+ * 
+ * @author MightyPork
+ */
+public class VectAnimated extends VectMutable implements Pauseable, Updateable {
+	
+	private final NumAnimated x, y, z;
+	private double defaultDuration = 0;
+	
+	
+	/**
+	 * Create an animated vector; This way different easing / settings can be
+	 * specified for each coordinate.
+	 * 
+	 * @param x x animator
+	 * @param y y animator
+	 * @param z z animator
+	 */
+	public VectAnimated(NumAnimated x, NumAnimated y, NumAnimated z) {
+		this.x = x;
+		this.y = y;
+		this.z = z;
+	}
+	
+	
+	/**
+	 * Create an animated vector
+	 * 
+	 * @param start initial positioon
+	 * @param easing animation easing
+	 */
+	public VectAnimated(Vect start, Easing easing) {
+		x = new NumAnimated(start.x(), easing);
+		y = new NumAnimated(start.y(), easing);
+		z = new NumAnimated(start.z(), easing);
+	}
+	
+	
+	@Override
+	public double x()
+	{
+		return x.value();
+	}
+	
+	
+	@Override
+	public double y()
+	{
+		return y.value();
+	}
+	
+	
+	@Override
+	public double z()
+	{
+		return z.value();
+	}
+	
+	
+	@Override
+	public void setTo(double x, double y, double z)
+	{
+		setX(x);
+		setY(y);
+		setZ(z);
+	}
+	
+	
+	@Override
+	public void setX(double x)
+	{
+		this.x.animate(x, defaultDuration);
+	}
+	
+	
+	@Override
+	public void setY(double y)
+	{
+		this.y.animate(y, defaultDuration);
+	}
+	
+	
+	@Override
+	public void setZ(double z)
+	{
+		this.z.animate(z, defaultDuration);
+	}
+	
+	
+	/**
+	 * Add offset with animation
+	 * 
+	 * @param offset added offset
+	 * @param duration animation time (seconds)
+	 */
+	public void add(Vect offset, double duration)
+	{
+		animate(this.add(offset), duration);
+	}
+	
+	
+	/**
+	 * Animate to given coordinates in given amount of time
+	 * 
+	 * @param x
+	 * @param y
+	 * @param z
+	 * @param duration animation time (seconds)
+	 * @return this
+	 */
+	public VectAnimated animate(double x, double y, double z, double duration)
+	{
+		this.x.animate(x, duration);
+		this.y.animate(y, duration);
+		this.z.animate(z, duration);
+		return this;
+	}
+	
+	
+	/**
+	 * Animate to given vec in given amount of time.
+	 * 
+	 * @param target target (only it's current value will be used)
+	 * @param duration animation time (seconds)
+	 * @return this
+	 */
+	public VectAnimated animate(Vect target, double duration)
+	{
+		animate(target.x(), target.y(), target.z(), duration);
+		return this;
+	}
+	
+	
+	/**
+	 * @return the default duration (seconds)
+	 */
+	public double getDefaultDuration()
+	{
+		return defaultDuration;
+	}
+	
+	
+	/**
+	 * Set default animation duration (when changed without using animate())
+	 * 
+	 * @param defaultDuration default duration (seconds)
+	 */
+	public void setDefaultDuration(double defaultDuration)
+	{
+		this.defaultDuration = defaultDuration;
+	}
+	
+	
+	@Override
+	public void update(double delta)
+	{
+		x.update(delta);
+		y.update(delta);
+		z.update(delta);
+	}
+	
+	
+	@Override
+	public void pause()
+	{
+		x.pause();
+		y.pause();
+		z.pause();
+	}
+	
+	
+	@Override
+	public void resume()
+	{
+		x.resume();
+		y.resume();
+		z.resume();
+	}
+	
+	
+	@Override
+	public boolean isPaused()
+	{
+		return x.isPaused(); // BÚNO
+	}
+	
+	
+	/**
+	 * @return true if the animation is finished
+	 */
+	public boolean isFinished()
+	{
+		return x.isFinished(); // BÚNO
+	}
+	
+	
+	/**
+	 * @return current animation duration
+	 */
+	public double getDuration()
+	{
+		return x.getDuration(); // BÚNO
+	}
+	
+	
+	/**
+	 * @return elapsed time since the start of the animation
+	 */
+	public double getElapsed()
+	{
+		return x.getElapsed(); // BÚNO
+	}
+	
+	
+	/**
+	 * @return animation progress (elapsed / duration)
+	 */
+	public double getProgress()
+	{
+		return x.getProgress(); // BÚNO
+	}
+	
+	
+	/**
+	 * Set easing for all three coordinates
+	 * 
+	 * @param easing
+	 */
+	public void setEasing(Easing easing)
+	{
+		x.setEasing(easing);
+		y.setEasing(easing);
+		z.setEasing(easing);
+	}
+	
+	
+	/**
+	 * Create an animated vector; This way different easing / settings can be
+	 * specified for each coordinate.
+	 * 
+	 * @param x x animator
+	 * @param y y animator
+	 * @param z z animator
+	 * @return animated mutable vector
+	 */
+	@FactoryMethod
+	public static VectAnimated makeVar(NumAnimated x, NumAnimated y, NumAnimated z)
+	{
+		return new VectAnimated(x, y, z);
+	}
+	
+	
+	/**
+	 * Create an animated vector
+	 * 
+	 * @param start initial positioon
+	 * @param easing animation easing
+	 * @return animated mutable vector
+	 */
+	@FactoryMethod
+	public static VectAnimated makeVar(Vect start, Easing easing)
+	{
+		return new VectAnimated(start, easing);
+	}
+	
+	
+	/**
+	 * Create an animated vector, initialized at 0,0,0
+	 * 
+	 * @param easing animation easing
+	 * @return animated mutable vector
+	 */
+	@FactoryMethod
+	public static VectAnimated makeVar(Easing easing)
+	{
+		return new VectAnimated(Vect.ZERO, easing);
+	}
+	
+}

src/mightypork/util/math/constraints/vect/mutable/VectMutable.java

@@ -0,0 +1,80 @@
+package mightypork.util.math.constraints.vect.mutable;
+
+
+import mightypork.util.math.constraints.vect.Vect;
+
+
+/**
+ * Mutable coord
+ * 
+ * @author MightyPork
+ */
+abstract class VectMutable extends Vect {
+	
+	/**
+	 * Set all to zeros.
+	 */
+	public void reset()
+	{
+		setTo(0, 0, 0);
+	}
+	
+	
+	/**
+	 * Set coordinates to match other coord.
+	 * 
+	 * @param copied coord whose coordinates are used
+	 */
+	public void setTo(Vect copied)
+	{
+		setTo(copied.x(), copied.y(), copied.z());
+	}
+	
+	
+	/**
+	 * Set 2D coordinates.<br>
+	 * Z is unchanged.
+	 * 
+	 * @param x x coordinate
+	 * @param y y coordinate
+	 */
+	public void setTo(double x, double y)
+	{
+		setX(x);
+		setY(y);
+	}
+	
+	
+	/**
+	 * Set coordinates.
+	 * 
+	 * @param x x coordinate
+	 * @param y y coordinate
+	 * @param z z coordinate
+	 */
+	public abstract void setTo(double x, double y, double z);
+	
+	
+	/**
+	 * Set X coordinate.
+	 * 
+	 * @param x x coordinate
+	 */
+	public abstract void setX(double x);
+	
+	
+	/**
+	 * Set Y coordinate.
+	 * 
+	 * @param y y coordinate
+	 */
+	public abstract void setY(double y);
+	
+	
+	/**
+	 * Set Z coordinate.
+	 * 
+	 * @param z z coordinate
+	 */
+	public abstract void setZ(double z);
+}

src/mightypork/util/math/constraints/vect/mutable/VectVar.java

@@ -0,0 +1,77 @@
+package mightypork.util.math.constraints.vect.mutable;
+
+
+/**
+ * Mutable coordinate.<br>
+ * All Vec methods (except copy) alter data values and return this instance.
+ * 
+ * @author MightyPork
+ */
+public class VectVar extends VectMutable {
+	
+	private double x, y, z;
+	
+	
+	/**
+	 * @param x X coordinate
+	 * @param y Y coordinate
+	 * @param z Z coordinate
+	 */
+	public VectVar(double x, double y, double z) {
+		super();
+		this.x = x;
+		this.y = y;
+		this.z = z;
+	}
+	
+	
+	@Override
+	public double x()
+	{
+		return x;
+	}
+	
+	
+	@Override
+	public double y()
+	{
+		return y;
+	}
+	
+	
+	@Override
+	public double z()
+	{
+		return z;
+	}
+	
+	
+	@Override
+	public void setTo(double x, double y, double z)
+	{
+		this.x = x;
+		this.y = y;
+		this.z = z;
+	}
+	
+	
+	@Override
+	public void setX(double x)
+	{
+		this.x = x;
+	}
+	
+	
+	@Override
+	public void setY(double y)
+	{
+		this.y = y;
+	}
+	
+	
+	@Override
+	public void setZ(double z)
+	{
+		this.z = z;
+	}
+}

src/mightypork/util/math/constraints/vect/proxy/PluggableVectBound.java

@@ -0,0 +1,16 @@
+package mightypork.util.math.constraints.vect.proxy;
+
+
+/**
+ * Pluggable vector constraint
+ * 
+ * @author MightyPork
+ */
+public interface PluggableVectBound extends VectBound {
+	
+	/**
+	 * @param num bound to set
+	 */
+	abstract void setVect(VectBound num);
+	
+}

src/mightypork/util/math/constraints/vect/proxy/VectAdapter.java

@@ -0,0 +1,41 @@
+package mightypork.util.math.constraints.vect.proxy;
+
+
+import mightypork.util.math.constraints.vect.Vect;
+
+
+/**
+ * Vect proxy with abstract method for plugging in / generating coordinates
+ * dynamically.
+ * 
+ * @author MightyPork
+ */
+public abstract class VectAdapter extends Vect {
+	
+	/**
+	 * @return the proxied coord
+	 */
+	protected abstract Vect getSource();
+	
+	
+	@Override
+	public double x()
+	{
+		return getSource().x();
+	}
+	
+	
+	@Override
+	public double y()
+	{
+		return getSource().y();
+	}
+	
+	
+	@Override
+	public double z()
+	{
+		return getSource().z();
+	}
+	
+}

src/mightypork/util/math/constraints/vect/proxy/VectBound.java

@@ -0,0 +1,18 @@
+package mightypork.util.math.constraints.vect.proxy;
+
+
+import mightypork.util.math.constraints.vect.Vect;
+
+
+/**
+ * Element holding a vector, used for constraint building.
+ * 
+ * @author MightyPork
+ */
+public interface VectBound {
+	
+	/**
+	 * @return the current vector.
+	 */
+	public Vect getVect();
+}

src/mightypork/util/math/constraints/vect/proxy/VectBoundAdapter.java

@@ -0,0 +1,34 @@
+package mightypork.util.math.constraints.vect.proxy;
+
+
+import mightypork.util.math.constraints.vect.Vect;
+
+
+public class VectBoundAdapter extends VectAdapter implements PluggableVectBound {
+	
+	private VectBound backing = null;
+	
+	
+	public VectBoundAdapter() {
+	}
+	
+	
+	public VectBoundAdapter(VectBound bound) {
+		backing = bound;
+	}
+	
+	
+	@Override
+	public void setVect(VectBound rect)
+	{
+		this.backing = rect;
+	}
+	
+	
+	@Override
+	protected Vect getSource()
+	{
+		return backing.getVect();
+	}
+	
+}

src/mightypork/util/math/constraints/vect/proxy/VectNumAdapter.java

@@ -0,0 +1,55 @@
+package mightypork.util.math.constraints.vect.proxy;
+
+
+import mightypork.util.math.constraints.num.Num;
+import mightypork.util.math.constraints.num.proxy.NumBound;
+import mightypork.util.math.constraints.vect.Vect;
+
+
+/**
+ * Coord view composed of given {@link NumBound}s, using their current values.
+ * 
+ * @author MightyPork
+ */
+public class VectNumAdapter extends Vect {
+	
+	private final Num constrX;
+	private final Num constrY;
+	private final Num constrZ;
+	
+	
+	public VectNumAdapter(Num x, Num y, Num z) {
+		this.constrX = x;
+		this.constrY = y;
+		this.constrZ = z;
+	}
+	
+	
+	public VectNumAdapter(Num x, Num y) {
+		this.constrX = x;
+		this.constrY = y;
+		this.constrZ = Num.ZERO;
+	}
+	
+	
+	@Override
+	public double x()
+	{
+		return constrX.value();
+	}
+	
+	
+	@Override
+	public double y()
+	{
+		return constrY.value();
+	}
+	
+	
+	@Override
+	public double z()
+	{
+		return constrZ.value();
+	}
+	
+}