Box2D  2.3.0
A 2D Physics Engine for Games
b2ChainShape.h
1 /*
2 * Copyright (c) 2006-2010 Erin Catto http://www.box2d.org
3 *
4 * This software is provided 'as-is', without any express or implied
5 * warranty. In no event will the authors be held liable for any damages
6 * arising from the use of this software.
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8 * including commercial applications, and to alter it and redistribute it
9 * freely, subject to the following restrictions:
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11 * claim that you wrote the original software. If you use this software
12 * in a product, an acknowledgment in the product documentation would be
13 * appreciated but is not required.
14 * 2. Altered source versions must be plainly marked as such, and must not be
15 * misrepresented as being the original software.
16 * 3. This notice may not be removed or altered from any source distribution.
17 */
18 
19 #ifndef B2_CHAIN_SHAPE_H
20 #define B2_CHAIN_SHAPE_H
21 
22 #include <Box2D/Collision/Shapes/b2Shape.h>
23 
24 class b2EdgeShape;
25 
32 class b2ChainShape : public b2Shape
33 {
34 public:
35  b2ChainShape();
36 
38  ~b2ChainShape();
39 
41  void Clear();
42 
46  void CreateLoop(const b2Vec2* vertices, int32 count);
47 
51  void CreateChain(const b2Vec2* vertices, int32 count);
52 
55  void SetPrevVertex(const b2Vec2& prevVertex);
56 
59  void SetNextVertex(const b2Vec2& nextVertex);
60 
62  b2Shape* Clone(b2BlockAllocator* allocator) const;
63 
65  int32 GetChildCount() const;
66 
68  void GetChildEdge(b2EdgeShape* edge, int32 index) const;
69 
72  bool TestPoint(const b2Transform& transform, const b2Vec2& p) const;
73 
75  bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input,
76  const b2Transform& transform, int32 childIndex) const;
77 
79  void ComputeAABB(b2AABB* aabb, const b2Transform& transform, int32 childIndex) const;
80 
83  void ComputeMass(b2MassData* massData, float32 density) const;
84 
87 
89  int32 m_count;
90 
91  b2Vec2 m_prevVertex, m_nextVertex;
92  bool m_hasPrevVertex, m_hasNextVertex;
93 };
94 
95 inline b2ChainShape::b2ChainShape()
96 {
97  m_type = e_chain;
98  m_radius = b2_polygonRadius;
99  m_vertices = NULL;
100  m_count = 0;
101  m_hasPrevVertex = false;
102  m_hasNextVertex = false;
103 }
104 
105 #endif
b2Vec2
A 2D column vector.
Definition: b2Math.h:53
b2ChainShape::Clear
void Clear()
Clear all data.
Definition: b2ChainShape.cpp:29
b2EdgeShape
Definition: b2EdgeShape.h:27
b2ChainShape::CreateChain
void CreateChain(const b2Vec2 *vertices, int32 count)
Definition: b2ChainShape.cpp:58
b2RayCastInput
Ray-cast input data. The ray extends from p1 to p1 + maxFraction * (p2 - p1).
Definition: b2Collision.h:147
b2ChainShape::ComputeMass
void ComputeMass(b2MassData *massData, float32 density) const
Definition: b2ChainShape.cpp:186
b2Transform
Definition: b2Math.h:350
b2ChainShape::Clone
b2Shape * Clone(b2BlockAllocator *allocator) const
Implement b2Shape. Vertices are cloned using b2Alloc.
Definition: b2ChainShape.cpp:91
b2ChainShape::RayCast
bool RayCast(b2RayCastOutput *output, const b2RayCastInput &input, const b2Transform &transform, int32 childIndex) const
Implement b2Shape.
Definition: b2ChainShape.cpp:148
b2ChainShape
Definition: b2ChainShape.h:32
b2ChainShape::GetChildCount
int32 GetChildCount() const
Definition: b2ChainShape.cpp:103
b2ChainShape::m_count
int32 m_count
The vertex count.
Definition: b2ChainShape.h:89
b2AABB
An axis aligned bounding box.
Definition: b2Collision.h:162
b2BlockAllocator
Definition: b2BlockAllocator.h:35
b2ChainShape::ComputeAABB
void ComputeAABB(b2AABB *aabb, const b2Transform &transform, int32 childIndex) const
Definition: b2ChainShape.cpp:168
b2_polygonRadius
#define b2_polygonRadius
Definition: b2Settings.h:77
b2ChainShape::m_vertices
b2Vec2 * m_vertices
The vertices. Owned by this class.
Definition: b2ChainShape.h:86
b2ChainShape::SetNextVertex
void SetNextVertex(const b2Vec2 &nextVertex)
Definition: b2ChainShape.cpp:85
b2ChainShape::TestPoint
bool TestPoint(const b2Transform &transform, const b2Vec2 &p) const
Definition: b2ChainShape.cpp:141
b2ChainShape::CreateLoop
void CreateLoop(const b2Vec2 *vertices, int32 count)
Definition: b2ChainShape.cpp:36
b2ChainShape::GetChildEdge
void GetChildEdge(b2EdgeShape *edge, int32 index) const
Get a child edge.
Definition: b2ChainShape.cpp:109
b2Shape
Definition: b2Shape.h:42
b2ChainShape::SetPrevVertex
void SetPrevVertex(const b2Vec2 &prevVertex)
Definition: b2ChainShape.cpp:79
b2MassData
This holds the mass data computed for a shape.
Definition: b2Shape.h:27
b2ChainShape::~b2ChainShape
~b2ChainShape()
The destructor frees the vertices using b2Free.
Definition: b2ChainShape.cpp:24
b2RayCastOutput
Definition: b2Collision.h:155