b2CircleShape.h
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上传日期:2022-01-07
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- /*
- * Copyright (c) 2006-2009 Erin Catto http://www.gphysics.com
- *
- * 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;
- /// Implement b2Shape.
- bool TestPoint(const b2Transform& transform, const b2Vec2& p) const;
- /// Implement b2Shape.
- bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input, const b2Transform& transform) const;
- /// @see b2Shape::ComputeAABB
- void ComputeAABB(b2AABB* aabb, const b2Transform& transform) 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