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b2PolygonShape.h

    00001 /*
    00002 * Copyright (c) 2006-2009 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_POLYGON_SHAPE_H
    00020 #define B2_POLYGON_SHAPE_H
    00021
    00022 #include <Box2D/Collision/Shapes/b2Shape.h>
    00023
    00028 class b2PolygonShape : public b2Shape
    00029 {
    00030 public:
    00031         b2PolygonShape();
    00032
    00034         b2Shape* Clone(b2BlockAllocator* allocator) const;
    00035
    00037         int32 GetChildCount() const;
    00038
    00042         void Set(const b2Vec2* vertices, int32 vertexCount);
    00043
    00047         void SetAsBox(float32 hx, float32 hy);
    00048
    00054         void SetAsBox(float32 hx, float32 hy, const b2Vec2& center, float32 angle);
    00055
    00057         bool TestPoint(const b2Transform& transform, const b2Vec2& p) const;
    00058
    00060         bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input,
    00061                                         const b2Transform& transform, int32 childIndex) const;
    00062
    00064         void ComputeAABB(b2AABB* aabb, const b2Transform& transform, int32 childIndex) const;
    00065
    00067         void ComputeMass(b2MassData* massData, float32 density) const;
    00068
    00070         int32 GetVertexCount() const { return m_vertexCount; }
    00071
    00073         const b2Vec2& GetVertex(int32 index) const;
    00074
    00075         b2Vec2 m_centroid;
    00076         b2Vec2 m_vertices[b2_maxPolygonVertices];
    00077         b2Vec2 m_normals[b2_maxPolygonVertices];
    00078         int32 m_vertexCount;
    00079 };
    00080
    00081 inline b2PolygonShape::b2PolygonShape()
    00082 {
    00083         m_type = e_polygon;
    00084         m_radius = b2_polygonRadius;
    00085         m_vertexCount = 0;
    00086         m_centroid.SetZero();
    00087 }
    00088
    00089 inline const b2Vec2& b2PolygonShape::GetVertex(int32 index) const
    00090 {
    00091         b2Assert(0 <= index && index < m_vertexCount);
    00092         return m_vertices[index];
    00093 }
    00094
    00095 #endif

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