CirclesPath.java

/* This file is part of Eternity II Editor.
 * 
 * Eternity II Editor is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Eternity II Editor is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Eternity II Editor.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Eternity II Editor project is hosted on SourceForge:
 * http://sourceforge.net/projects/eternityii/
 * and maintained by Yannick Kirschhoffer <alcibiade@alcibiade.org>
 */

package org.alcibiade.eternity.editor.solver.path;

public class CirclesPath extends StaticPathProvider {

	@Override
	protected int[] buildPath(int gsize) {
		int positions = gsize * gsize;
		int[] result = new int[positions];

		int offset = 0;

		for (int rad = 2 * gsize; rad >= 0; rad--) {
			for (int x = 0; x < gsize; x++) {
				for (int y = 0; y < gsize; y++) {
					int dist4 = Math.abs(x - gsize / 2) + Math.abs(y - gsize / 2);
					if (dist4 == rad) {
						result[offset++] = x + y * gsize;
					}
				}
			}
		}

		return result;
	}
}