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 java.util.LinkedList;

import itdelatrisu.opsu.OsuHitObject;

import org.newdawn.slick.Color;

/**
 * Representation of Catmull Curve with equidistant points.
 *
 * @author fluddokt (https://github.com/fluddokt)
 */
public class CatmullCurve extends EqualDistanceMultiCurve{

	/**
	 * Constructor.
	 * @param hitObject the associated OsuHitObject
	 * @param color the color of this curve
	 */
	public CatmullCurve(OsuHitObject hitObject, Color color) {
		super(hitObject, color);
		LinkedList<CurveType> catmulls = new LinkedList<CurveType>();
		int ncontrolPoints = hitObject.getSliderX().length + 1;
		// temporary list of points to separate different curves
		LinkedList<Vec2f> points = new LinkedList<Vec2f>();
		
		// repeat the first and last points as controls points
		// aabb
		// aabc abcc
		// aabc abcd bcdd
		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) {
				catmulls.add(new CentripetalCatmullRom(points.toArray(new Vec2f[0])));
				points.removeFirst();
			}
		}
		points.addLast(new Vec2f(getX(ncontrolPoints - 1),getY(ncontrolPoints - 1)));
		if (points.size() >= 4) {
			catmulls.add(new CentripetalCatmullRom(points.toArray(new Vec2f[0])));
		}
		init(catmulls);
	}
}