2012-04-19 14:35:52 +08:00
|
|
|
/*
|
|
|
|
|
* 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
|
