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/*
* Copyright (c) 2006-2007 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 "b2Shape.h"
/// This structure is used to build circle shapes.
struct b2CircleDef : public b2ShapeDef
{
b2CircleDef()
{
type = e_circleShape;
localPosition.SetZero();
radius = 1.0f;
}
b2Vec2 localPosition;
float32 radius;
};
/// A circle shape.
class b2CircleShape : public b2Shape
{
public:
/// @see b2Shape::TestPoint
bool TestPoint(const b2XForm& transform, const b2Vec2& p) const;
/// @see b2Shape::TestSegment
b2SegmentCollide TestSegment( const b2XForm& transform,
float32* lambda,
b2Vec2* normal,
const b2Segment& segment,
float32 maxLambda) const;
/// @see b2Shape::ComputeAABB
void ComputeAABB(b2AABB* aabb, const b2XForm& transform) const;
/// @see b2Shape::ComputeSweptAABB
void ComputeSweptAABB( b2AABB* aabb,
const b2XForm& transform1,
const b2XForm& transform2) const;
/// @see b2Shape::ComputeMass
void ComputeMass(b2MassData* massData) const;
/// @see b2Shape::ComputeSubmergedArea
float32 ComputeSubmergedArea( const b2Vec2& normal,
float32 offset,
const b2XForm& xf,
b2Vec2* c) const;
/// Get the local position of this circle in its parent body.
const b2Vec2& GetLocalPosition() const;
/// Get the radius of this circle.
float32 GetRadius() const;
private:
friend class b2Shape;
b2CircleShape(const b2ShapeDef* def);
void UpdateSweepRadius(const b2Vec2& center);
// Local position in parent body
b2Vec2 m_localPosition;
float32 m_radius;
};
inline const b2Vec2& b2CircleShape::GetLocalPosition() const
{
return m_localPosition;
}
inline float32 b2CircleShape::GetRadius() const
{
return m_radius;
}
#endif
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