opsu-dance/src/itdelatrisu/opsu/objects/curves/CatmullCurve.java

/*
 * opsu! - an open-source osu! client
 * Copyright (C) 2014, 2015 Jeffrey Han
 *
 * opsu! 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.
 *
 * opsu! 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 opsu!.  If not, see <http://www.gnu.org/licenses/>.
 */

package itdelatrisu.opsu.objects.curves;

import itdelatrisu.opsu.ErrorHandler;
import itdelatrisu.opsu.beatmap.HitObject;

import java.util.LinkedList;

import org.newdawn.slick.SlickException;

/**
 * Representation of Catmull Curve with equidistant points.
 *
 * @author fluddokt (https://github.com/fluddokt)
 */
public class CatmullCurve extends EqualDistanceMultiCurve {
	/**
	 * Constructor.
	 * @param hitObject the associated HitObject
	 */
	public CatmullCurve(HitObject hitObject) {
		super(hitObject);
		LinkedList<CurveType> catmulls = new LinkedList<CurveType>();
		int ncontrolPoints = hitObject.getSliderX().length + 1;
		LinkedList<Vec2f> points = new LinkedList<Vec2f>();  // temporary list of points to separate different curves

		// repeat the first and last points as controls points
		// only if the first/last two points are different
		// aabb
		// aabc abcc
		// aabc abcd bcdd
		if (getX(0) != getX(1) || getY(0) != getY(1))
			points.addLast(new Vec2f(getX(0), getY(0)));
		for (int i = 0; i < ncontrolPoints; i++) {
			points.addLast(new Vec2f(getX(i), getY(i)));
			if (points.size() >= 4) {
				try {
					catmulls.add(new CentripetalCatmullRom(points.toArray(new Vec2f[0])));
				} catch (SlickException e) {
					ErrorHandler.error(null, e, true);
				}
				points.removeFirst();
			}
		}
		if (getX(ncontrolPoints - 1) != getX(ncontrolPoints - 2) ||
		    getY(ncontrolPoints - 1) != getY(ncontrolPoints - 2))
			points.addLast(new Vec2f(getX(ncontrolPoints - 1), getY(ncontrolPoints - 1)));
		if (points.size() >= 4) {
			try {
				catmulls.add(new CentripetalCatmullRom(points.toArray(new Vec2f[0])));
			} catch (SlickException e) {
				ErrorHandler.error(null, e, true);
			}
		}

		init(catmulls);
	}
}