Rogue: Savage Rats, a retro-themed dungeon crawler
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rogue-savage-rats/src/mightypork/rogue/world/gen/rooms/SimpleRectRoom.java

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package mightypork.rogue.world.gen.rooms;
import java.util.Random;
import mightypork.gamecore.util.math.algo.Coord;
import mightypork.gamecore.util.math.algo.Sides;
import mightypork.rogue.world.gen.MapTheme;
import mightypork.rogue.world.gen.RoomBuilder;
import mightypork.rogue.world.gen.RoomDesc;
import mightypork.rogue.world.gen.ScratchMap;
import mightypork.rogue.world.tile.TileModel;
public class SimpleRectRoom implements RoomBuilder {
@Override
public RoomDesc buildToFit(ScratchMap map, MapTheme theme, Random rand, Coord center)
{
// half width, half height actually
final int width = 2 + rand.nextInt(2);
final int height = 2 + rand.nextInt(2);
final Coord min = new Coord(center.x - width, center.y - height);
final Coord max = new Coord(center.x + width, center.y + height);
if (!map.isClear(min, max)) return null;
map.fill(min, max, theme.floor());
map.border(min, max, theme.wall());
map.protect(min, max);
final boolean holes = rand.nextInt(4) == 0;
for (int i = 0; i <= 2 + rand.nextInt(6); i++) {
final Coord door = min.copy();
switch (rand.nextInt(4)) {
case 0:
door.y = min.y;
door.x += 1 + rand.nextInt((width - 1) * 2);
break;
case 1:
door.y = max.y;
door.x += 1 + rand.nextInt((width - 1) * 2);
break;
case 2:
door.x = min.x;
door.y += 1 + rand.nextInt((height - 1) * 2);
break;
case 3:
door.x = max.x;
door.y += 1 + rand.nextInt((height - 1) * 2);
break;
}
if ((map.findDoors(door) & Sides.CARDINAL) == 0) {
TileModel placed;
switch (rand.nextInt(8)) {
case 0:
case 1:
placed = theme.passage();
break;
default:
placed = holes ? theme.floor() : theme.door();
}
map.set(door, placed);
}
}
return new RoomDesc(min.add(-1, -1), max);
}
}