SubTile.java

package hunternif.mc.atlas.client;

import hunternif.mc.atlas.core.Tile;

/**
 * A quarter of a tile, containing the following information:
 * <ul>
 * <li><b>tile</b>, containing the texture file and the variation number</li>
 * <li><b>offset</b> from the top left corner to the appropriate sub-tile part
 * 		of the texture</li>
 * <li><b>x, y</b> coordinates of the subtile on the grid, measured in subtiles,
 * 		starting from (0,0) in the top left corner</li>
 * <li><b>shape</b> of the subtile</li>
 * <li>which <b>part</b> of the whole tile this subtile constitutes</li>
 * </ul>
 * @author Hunternif
 */
public class SubTile {
	public Tile tile;
	/** coordinates of the subtile on the grid, measured in subtiles,
	 * starting from (0,0) in the top left corner. */
	public int x, y;
	
	public enum Shape {
		CONVEX, CONCAVE, HORIZONTAL, VERTICAL, FULL, SINGLE_OBJECT
	}
	public Shape shape;
	
	public enum Part {
		TOP_LEFT(0, 0), TOP_RIGHT(1, 0), BOTTOM_LEFT(0, 1), BOTTOM_RIGHT(1, 1);
		/** Texture offset from a whole-tile-section to the respective part, in subtiles. */
		final int u, v;
		Part(int u, int v) {
			this.u = u;
			this.v = v;
		}
	}
	public Part part;
	
	public SubTile(Part part) {
		this.part = part;
	}
	
	/** Texture offset from to the respective subtile section, in subtiles. */
	public int getTextureU() {
		switch (shape) {
		case SINGLE_OBJECT: return part.u;
		case CONCAVE: return 2 + part.u;
		case VERTICAL:
		case CONVEX: return part.u * 3;
		case HORIZONTAL:
		case FULL: return 2 - part.u;
		default: return 0;
		}
	}
	
	/** Texture offset from to the respective subtile section, in subtiles. */
	public int getTextureV() {
		switch (shape) {
		case SINGLE_OBJECT:
		case CONCAVE: return part.v;
		case CONVEX:
		case HORIZONTAL: return 2 + part.v * 3;
		case FULL:
		case VERTICAL: return 4 - part.v;
		default: return 0;
		}
	}
}