/* * Copyright (c) 2006-2009 Erin Catto http://www.box2d.org * * This software is provided 'as-is', without any express or implied * warranty. In no event will the authors be held liable for any damages * arising from the use of this software. * Permission is granted to anyone to use this software for any purpose, * including commercial applications, and to alter it and redistribute it * freely, subject to the following restrictions: * 1. The origin of this software must not be misrepresented; you must not * claim that you wrote the original software. If you use this software * in a product, an acknowledgment in the product documentation would be * appreciated but is not required. * 2. Altered source versions must be plainly marked as such, and must not be * misrepresented as being the original software. * 3. This notice may not be removed or altered from any source distribution. */ #ifndef B2_CIRCLE_SHAPE_H #define B2_CIRCLE_SHAPE_H #include <Box2D/Collision/Shapes/b2Shape.h> /// A circle shape. class b2CircleShape : public b2Shape { public: b2CircleShape(); /// Implement b2Shape. b2Shape* Clone(b2BlockAllocator* allocator) const; /// @see b2Shape::GetChildCount int32 GetChildCount() const; /// Implement b2Shape. bool TestPoint(const b2Transform& transform, const b2Vec2& p) const; /// Implement b2Shape. bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input, const b2Transform& transform, int32 childIndex) const; /// @see b2Shape::ComputeAABB void ComputeAABB(b2AABB* aabb, const b2Transform& transform, int32 childIndex) const; /// @see b2Shape::ComputeMass void ComputeMass(b2MassData* massData, float32 density) const; /// Get the supporting vertex index in the given direction. int32 GetSupport(const b2Vec2& d) const; /// Get the supporting vertex in the given direction. const b2Vec2& GetSupportVertex(const b2Vec2& d) const; /// Get the vertex count. int32 GetVertexCount() const { return 1; } /// Get a vertex by index. Used by b2Distance. const b2Vec2& GetVertex(int32 index) const; /// Position b2Vec2 m_p; }; inline b2CircleShape::b2CircleShape() { m_type = e_circle; m_radius = 0.0f; m_p.SetZero(); } inline int32 b2CircleShape::GetSupport(const b2Vec2 &d) const { B2_NOT_USED(d); return 0; } inline const b2Vec2& b2CircleShape::GetSupportVertex(const b2Vec2 &d) const { B2_NOT_USED(d); return m_p; } inline const b2Vec2& b2CircleShape::GetVertex(int32 index) const { B2_NOT_USED(index); b2Assert(index == 0); return m_p; } #endif