Box2D: /build/box2d/src/box2d-adaedf1772ede7420bc9ee569c8cba7952db91a0/include/box2d/b2_chain_shape.h Source File

| Box2D 2.4.0 A 2D physics engine for games

b2_chain_shape.h
1 // MIT License
2
3 // Copyright (c) 2019 Erin Catto
4
5 // Permission is hereby granted, free of charge, to any person obtaining a copy
6 // of this software and associated documentation files (the "Software"), to deal
7 // in the Software without restriction, including without limitation the rights
8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 // copies of the Software, and to permit persons to whom the Software is
10 // furnished to do so, subject to the following conditions:
11
12 // The above copyright notice and this permission notice shall be included in all
13 // copies or substantial portions of the Software.
14
15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 // SOFTWARE.
22
23 #ifndef B2_CHAIN_SHAPE_H
24 #define B2_CHAIN_SHAPE_H
25
26 #include "b2_api.h"
27 #include "b2_shape.h"
28
29 class b2EdgeShape;
30
36 class B2_API b2ChainShape : public b2Shape
37 {
38 public:
39 b2ChainShape();
40
42 ~b2ChainShape();
43
45 void Clear();
46
50 void CreateLoop(const b2Vec2* vertices, int32 count);
51
57 void CreateChain(const b2Vec2* vertices, int32 count,
58 const b2Vec2& prevVertex, const b2Vec2& nextVertex);
59
61 b2Shape* Clone(b2BlockAllocator* allocator) const override;
62
64 int32 GetChildCount() const override;
65
67 void GetChildEdge(b2EdgeShape* edge, int32 index) const;
68
71 bool TestPoint(const b2Transform& transform, const b2Vec2& p) const override;
72
74 bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input,
75 const b2Transform& transform, int32 childIndex) const override;
76
78 void ComputeAABB(b2AABB* aabb, const b2Transform& transform, int32 childIndex) const override;
79
82 void ComputeMass(b2MassData* massData, float density) const override;
83
85 b2Vec2* m_vertices;
86
88 int32 m_count;
89
90 b2Vec2 m_prevVertex, m_nextVertex;
91 };
92
93 inline b2ChainShape::b2ChainShape()
94 {
95 m_type = e_chain;
96 m_radius = b2_polygonRadius;
97 m_vertices = nullptr;
98 m_count = 0;
99 }
100
101 #endif
b2Vec2
A 2D column vector.
Definition: b2_math.h:42
b2ChainShape::Clone
b2Shape * Clone(b2BlockAllocator *allocator) const override
Implement b2Shape. Vertices are cloned using b2Alloc.
b2ChainShape::Clear
void Clear()
Clear all data.
b2EdgeShape
Definition: b2_edge_shape.h:33
b2RayCastInput
Ray-cast input data. The ray extends from p1 to p1 + maxFraction * (p2 - p1).
Definition: b2_collision.h:154
b2Transform
Definition: b2_math.h:339
b2ChainShape::ComputeAABB
void ComputeAABB(b2AABB *aabb, const b2Transform &transform, int32 childIndex) const override
b2Shape::m_radius
float m_radius
Definition: b2_shape.h:102
b2_polygonRadius
#define b2_polygonRadius
Definition: b2_settings.h:85
b2ChainShape
Definition: b2_chain_shape.h:37
b2ChainShape::m_count
int32 m_count
The vertex count.
Definition: b2_chain_shape.h:88
b2AABB
An axis aligned bounding box.
Definition: b2_collision.h:169
b2ChainShape::TestPoint
bool TestPoint(const b2Transform &transform, const b2Vec2 &p) const override
b2BlockAllocator
Definition: b2_block_allocator.h:38
b2ChainShape::m_vertices
b2Vec2 * m_vertices
The vertices. Owned by this class.
Definition: b2_chain_shape.h:85
b2ChainShape::CreateLoop
void CreateLoop(const b2Vec2 *vertices, int32 count)
b2ChainShape::GetChildEdge
void GetChildEdge(b2EdgeShape *edge, int32 index) const
Get a child edge.
b2Shape
Definition: b2_shape.h:49
b2MassData
This holds the mass data computed for a shape.
Definition: b2_shape.h:34
b2ChainShape::RayCast
bool RayCast(b2RayCastOutput *output, const b2RayCastInput &input, const b2Transform &transform, int32 childIndex) const override
Implement b2Shape.
b2ChainShape::CreateChain
void CreateChain(const b2Vec2 *vertices, int32 count, const b2Vec2 &prevVertex, const b2Vec2 &nextVertex)
b2ChainShape::~b2ChainShape
~b2ChainShape()
The destructor frees the vertices using b2Free.
b2ChainShape::GetChildCount
int32 GetChildCount() const override
b2RayCastOutput
Definition: b2_collision.h:162
b2ChainShape::ComputeMass
void ComputeMass(b2MassData *massData, float density) const override