b2ChainShape.h

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/*
* Copyright (c) 2006-2010 Erin Catto http://www.box2d.org
*
* This software is provided 'as-is', without any express or implied
* warranty.  In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/

#ifndef B2_CHAIN_SHAPE_H
#define B2_CHAIN_SHAPE_H

#include <Box2D/Collision/Shapes/b2Shape.h>

class b2EdgeShape;

class b2ChainShape : public b2Shape
{
public:
        b2ChainShape();

        ~b2ChainShape();

        void Clear();

        void CreateLoop(const b2Vec2* vertices, int32 count);

        void CreateChain(const b2Vec2* vertices, int32 count);

        void SetPrevVertex(const b2Vec2& prevVertex);

        void SetNextVertex(const b2Vec2& nextVertex);

        b2Shape* Clone(b2BlockAllocator* allocator) const;

        int32 GetChildCount() const;

        void GetChildEdge(b2EdgeShape* edge, int32 index) const;

        bool TestPoint(const b2Transform& transform, const b2Vec2& p) const;

        bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input,
                                        const b2Transform& transform, int32 childIndex) const;

        void ComputeAABB(b2AABB* aabb, const b2Transform& transform, int32 childIndex) const;

        void ComputeMass(b2MassData* massData, float32 density) const;

        b2Vec2* m_vertices;

        int32 m_count;

        b2Vec2 m_prevVertex, m_nextVertex;
        bool m_hasPrevVertex, m_hasNextVertex;
};

inline b2ChainShape::b2ChainShape()
{
        m_type = e_chain;
        m_radius = b2_polygonRadius;
        m_vertices = NULL;
        m_count = 0;
        m_hasPrevVertex = false;
        m_hasNextVertex = false;
}

#endif