/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated May 1, 2019. Replaces all prior versions.
 *
 * Copyright (c) 2013-2019, Esoteric Software LLC
 *
 * Integration of the Spine Runtimes into software or otherwise creating
 * derivative works of the Spine Runtimes is permitted under the terms and
 * conditions of Section 2 of the Spine Editor License Agreement:
 * http://esotericsoftware.com/spine-editor-license
 *
 * Otherwise, it is permitted to integrate the Spine Runtimes into software
 * or otherwise create derivative works of the Spine Runtimes (collectively,
 * "Products"), provided that each user of the Products must obtain their own
 * Spine Editor license and redistribution of the Products in any form must
 * include this license and copyright notice.
 *
 * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
 * NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, BUSINESS
 * INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

#ifndef Spine_Triangulator_h
#define Spine_Triangulator_h

#include <spine/Vector.h>
#include <spine/Pool.h>

namespace spine {
class SP_API Triangulator : public SpineObject {
public:
	~Triangulator();

	Vector<int> &triangulate(Vector<float> &vertices);

	Vector< Vector<float>* > &decompose(Vector<float> &vertices, Vector<int> &triangles);

private:
	Vector<Vector < float>* > _convexPolygons;
	Vector<Vector < int>* > _convexPolygonsIndices;

	Vector<int> _indices;
	Vector<bool> _isConcaveArray;
	Vector<int> _triangles;

	Pool <Vector<float> > _polygonPool;
	Pool <Vector<int> > _polygonIndicesPool;

	static bool isConcave(int index, int vertexCount, Vector<float> &vertices, Vector<int> &indices);

	static bool positiveArea(float p1x, float p1y, float p2x, float p2y, float p3x, float p3y);

	static int winding(float p1x, float p1y, float p2x, float p2y, float p3x, float p3y);
};
}

#endif /* Spine_Triangulator_h */