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_CIRCLE_SHAPE_H
20#define B2_CIRCLE_SHAPE_H
21
22#include <Box2D/Collision/Shapes/b2Shape.h>
23
24/// A circle shape.
25class b2CircleShape : public b2Shape
26{
27public:
28 b2CircleShape();
29
30 /// Implement b2Shape.
31 b2Shape* Clone(b2BlockAllocator* allocator) const;
32
33 /// @see b2Shape::GetChildCount
34 int32 GetChildCount() const;
35
36 /// Implement b2Shape.
37 bool TestPoint(const b2Transform& transform, const b2Vec2& p) const;
38
39 /// Implement b2Shape.
40 bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input,
41 const b2Transform& transform, int32 childIndex) const;
42
43 /// @see b2Shape::ComputeAABB
44 void ComputeAABB(b2AABB* aabb, const b2Transform& transform, int32 childIndex) const;
45
46 /// @see b2Shape::ComputeMass
47 void ComputeMass(b2MassData* massData, float32 density) const;
48
49 /// Get the supporting vertex index in the given direction.
50 int32 GetSupport(const b2Vec2& d) const;
51
52 /// Get the supporting vertex in the given direction.
53 const b2Vec2& GetSupportVertex(const b2Vec2& d) const;
54
55 /// Get the vertex count.
56 int32 GetVertexCount() const { return 1; }
57
58 /// Get a vertex by index. Used by b2Distance.
59 const b2Vec2& GetVertex(int32 index) const;
60
61 /// Position
62 b2Vec2 m_p;
63};
64
65inline b2CircleShape::b2CircleShape()
66{
67 m_type = e_circle;
68 m_radius = 0.0f;
69 m_p.SetZero();
70}
71
72inline int32 b2CircleShape::GetSupport(const b2Vec2 &d) const
73{
74 B2_NOT_USED(d);
75 return 0;
76}
77
78inline const b2Vec2& b2CircleShape::GetSupportVertex(const b2Vec2 &d) const
79{
80 B2_NOT_USED(d);
81 return m_p;
82}
83
84inline const b2Vec2& b2CircleShape::GetVertex(int32 index) const
85{
86 B2_NOT_USED(index);
87 b2Assert(index == 0);
88 return m_p;
89}
90
91#endif
92