Box2D  2.3.0
A 2D Physics Engine for Games
b2PolygonShape.h
1 /*
2 * Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
3 *
4 * This software is provided 'as-is', without any express or implied
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8 * including commercial applications, and to alter it and redistribute it
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17 */
18 
19 #ifndef B2_POLYGON_SHAPE_H
20 #define B2_POLYGON_SHAPE_H
21 
22 #include <Box2D/Collision/Shapes/b2Shape.h>
23 
28 class b2PolygonShape : public b2Shape
29 {
30 public:
32 
34  b2Shape* Clone(b2BlockAllocator* allocator) const;
35 
37  int32 GetChildCount() const;
38 
44  void Set(const b2Vec2* points, int32 count);
45 
49  void SetAsBox(float32 hx, float32 hy);
50 
56  void SetAsBox(float32 hx, float32 hy, const b2Vec2& center, float32 angle);
57 
59  bool TestPoint(const b2Transform& transform, const b2Vec2& p) const;
60 
62  bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input,
63  const b2Transform& transform, int32 childIndex) const;
64 
66  void ComputeAABB(b2AABB* aabb, const b2Transform& transform, int32 childIndex) const;
67 
69  void ComputeMass(b2MassData* massData, float32 density) const;
70 
72  int32 GetVertexCount() const { return m_count; }
73 
75  const b2Vec2& GetVertex(int32 index) const;
76 
79  bool Validate() const;
80 
81  b2Vec2 m_centroid;
82  b2Vec2 m_vertices[b2_maxPolygonVertices];
83  b2Vec2 m_normals[b2_maxPolygonVertices];
84  int32 m_count;
85 };
86 
87 inline b2PolygonShape::b2PolygonShape()
88 {
89  m_type = e_polygon;
90  m_radius = b2_polygonRadius;
91  m_count = 0;
92  m_centroid.SetZero();
93 }
94 
95 inline const b2Vec2& b2PolygonShape::GetVertex(int32 index) const
96 {
97  b2Assert(0 <= index && index < m_count);
98  return m_vertices[index];
99 }
100 
101 #endif
Definition: b2Math.h:350
bool Validate() const
Definition: b2PolygonShape.cpp:433
void ComputeAABB(b2AABB *aabb, const b2Transform &transform, int32 childIndex) const
Definition: b2PolygonShape.cpp:331
bool TestPoint(const b2Transform &transform, const b2Vec2 &p) const
Definition: b2PolygonShape.cpp:243
int32 GetChildCount() const
Definition: b2PolygonShape.cpp:69
Definition: b2BlockAllocator.h:35
This holds the mass data computed for a shape.
Definition: b2Shape.h:27
Definition: b2Shape.h:42
void ComputeMass(b2MassData *massData, float32 density) const
Definition: b2PolygonShape.cpp:350
void SetAsBox(float32 hx, float32 hy)
Definition: b2PolygonShape.cpp:30
Definition: b2PolygonShape.h:28
Definition: b2Collision.h:155
void SetZero()
Set this vector to all zeros.
Definition: b2Math.h:62
bool RayCast(b2RayCastOutput *output, const b2RayCastInput &input, const b2Transform &transform, int32 childIndex) const
Implement b2Shape.
Definition: b2PolygonShape.cpp:259
#define b2_polygonRadius
Definition: b2Settings.h:77
An axis aligned bounding box.
Definition: b2Collision.h:162
b2Shape * Clone(b2BlockAllocator *allocator) const
Implement b2Shape.
Definition: b2PolygonShape.cpp:22
Ray-cast input data. The ray extends from p1 to p1 + maxFraction * (p2 - p1).
Definition: b2Collision.h:147
void Set(const b2Vec2 *points, int32 count)
Definition: b2PolygonShape.cpp:120
int32 GetVertexCount() const
Get the vertex count.
Definition: b2PolygonShape.h:72
A 2D column vector.
Definition: b2Math.h:53
const b2Vec2 & GetVertex(int32 index) const
Get a vertex by index.
Definition: b2PolygonShape.h:95
#define b2_maxPolygonVertices
Definition: b2Settings.h:54