Box2D: b2PolygonShape.h Source File

| 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
5 * warranty. In no event will the authors be held liable for any damages
6 * arising from the use of this software.
7 * Permission is granted to anyone to use this software for any purpose,
8 * including commercial applications, and to alter it and redistribute it
9 * freely, subject to the following restrictions:
10 * 1. The origin of this software must not be misrepresented; you must not
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_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:
31 b2PolygonShape();
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
b2Transform
Definition: b2Math.h:350
b2PolygonShape::GetVertex
const b2Vec2 & GetVertex(int32 index) const
Get a vertex by index.
Definition: b2PolygonShape.h:95
b2PolygonShape::ComputeMass
void ComputeMass(b2MassData *massData, float32 density) const
Definition: b2PolygonShape.cpp:358
b2PolygonShape::TestPoint
bool TestPoint(const b2Transform &transform, const b2Vec2 &p) const
Definition: b2PolygonShape.cpp:251
b2PolygonShape::GetChildCount
int32 GetChildCount() const
Definition: b2PolygonShape.cpp:69
b2BlockAllocator
Definition: b2BlockAllocator.h:35
b2MassData
This holds the mass data computed for a shape.
Definition: b2Shape.h:27
b2Shape
Definition: b2Shape.h:42
b2PolygonShape::SetAsBox
void SetAsBox(float32 hx, float32 hy)
Definition: b2PolygonShape.cpp:30
b2PolygonShape
Definition: b2PolygonShape.h:28
b2RayCastOutput
Definition: b2Collision.h:155
b2Vec2::SetZero
void SetZero()
Set this vector to all zeros.
Definition: b2Math.h:62
b2PolygonShape::RayCast
bool RayCast(b2RayCastOutput *output, const b2RayCastInput &input, const b2Transform &transform, int32 childIndex) const
Implement b2Shape.
Definition: b2PolygonShape.cpp:267
b2_polygonRadius
#define b2_polygonRadius
Definition: b2Settings.h:77
b2AABB
An axis aligned bounding box.
Definition: b2Collision.h:162
b2PolygonShape::Validate
bool Validate() const
Definition: b2PolygonShape.cpp:441
b2RayCastInput
Ray-cast input data. The ray extends from p1 to p1 + maxFraction * (p2 - p1).
Definition: b2Collision.h:147
b2PolygonShape::GetVertexCount
int32 GetVertexCount() const
Get the vertex count.
Definition: b2PolygonShape.h:72
b2PolygonShape::ComputeAABB
void ComputeAABB(b2AABB *aabb, const b2Transform &transform, int32 childIndex) const
Definition: b2PolygonShape.cpp:339
b2PolygonShape::Set
void Set(const b2Vec2 *points, int32 count)
Definition: b2PolygonShape.cpp:120
b2Vec2
A 2D column vector.
Definition: b2Math.h:53
b2PolygonShape::Clone
b2Shape * Clone(b2BlockAllocator *allocator) const
Implement b2Shape.
Definition: b2PolygonShape.cpp:22
b2_maxPolygonVertices
#define b2_maxPolygonVertices
Definition: b2Settings.h:54