Box2D  2.2.0
A 2D Physics Engine for Games
b2ChainShape.h
00001 /*
00002 * Copyright (c) 2006-2010 Erin Catto http://www.box2d.org
00003 *
00004 * This software is provided 'as-is', without any express or implied
00005 * warranty.  In no event will the authors be held liable for any damages
00006 * arising from the use of this software.
00007 * Permission is granted to anyone to use this software for any purpose,
00008 * including commercial applications, and to alter it and redistribute it
00009 * freely, subject to the following restrictions:
00010 * 1. The origin of this software must not be misrepresented; you must not
00011 * claim that you wrote the original software. If you use this software
00012 * in a product, an acknowledgment in the product documentation would be
00013 * appreciated but is not required.
00014 * 2. Altered source versions must be plainly marked as such, and must not be
00015 * misrepresented as being the original software.
00016 * 3. This notice may not be removed or altered from any source distribution.
00017 */
00018 
00019 #ifndef B2_CHAIN_SHAPE_H
00020 #define B2_CHAIN_SHAPE_H
00021 
00022 #include <Box2D/Collision/Shapes/b2Shape.h>
00023 
00024 class b2EdgeShape;
00025 
00032 class b2ChainShape : public b2Shape
00033 {
00034 public:
00035         b2ChainShape();
00036 
00038         ~b2ChainShape();
00039 
00043         void CreateLoop(const b2Vec2* vertices, int32 count);
00044 
00048         void CreateChain(const b2Vec2* vertices, int32 count);
00049 
00052         void SetPrevVertex(const b2Vec2& prevVertex);
00053 
00056         void SetNextVertex(const b2Vec2& nextVertex);
00057 
00059         b2Shape* Clone(b2BlockAllocator* allocator) const;
00060 
00062         int32 GetChildCount() const;
00063 
00065         void GetChildEdge(b2EdgeShape* edge, int32 index) const;
00066 
00069         bool TestPoint(const b2Transform& transform, const b2Vec2& p) const;
00070 
00072         bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input,
00073                                         const b2Transform& transform, int32 childIndex) const;
00074 
00076         void ComputeAABB(b2AABB* aabb, const b2Transform& transform, int32 childIndex) const;
00077 
00080         void ComputeMass(b2MassData* massData, float32 density) const;
00081 
00083         int32 GetVertexCount() const { return m_count; }
00084 
00086         const b2Vec2& GetVertex(int32 index) const
00087         {
00088                 b2Assert(0 <= index && index < m_count);
00089                 return m_vertices[index];
00090         }
00091 
00093         const b2Vec2* GetVertices() const { return m_vertices; }
00094 
00095 protected:
00096 
00098         b2Vec2* m_vertices;
00099 
00101         int32 m_count;
00102 
00103         b2Vec2 m_prevVertex, m_nextVertex;
00104         bool m_hasPrevVertex, m_hasNextVertex;
00105 };
00106 
00107 inline b2ChainShape::b2ChainShape()
00108 {
00109         m_type = e_chain;
00110         m_radius = b2_polygonRadius;
00111         m_vertices = NULL;
00112         m_count = 0;
00113         m_hasPrevVertex = NULL;
00114         m_hasNextVertex = NULL;
00115 }
00116 
00117 #endif
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