Rogue: Savage Rats, a retro-themed dungeon crawler
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rogue-savage-rats/src/mightypork/test/TestPerlin.java

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package mightypork.test;
import java.util.Locale;
import mightypork.util.math.noise.NoiseGen;
public class TestPerlin {
public static void main(String[] args)
{
Locale.setDefault(Locale.ENGLISH);
final int w = 50, h = 50;
final NoiseGen ng = new NoiseGen(0.12, 0, 2.5, 5, (long) (Math.random() * 100));
final double[][] map = ng.buildMap(w, h);
final char[] colors = { ' ', '░', '▒', '▓', '█' };
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
// "pixels" two-thick
System.out.print(colors[(int) Math.floor(map[y][x])]);
System.out.print(colors[(int) Math.floor(map[y][x])]);
}
System.out.println();
}
}
}