b2_chain_shape.h

// MIT License
 
// Copyright (c) 2019 Erin Catto
 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
 
#ifndef B2_CHAIN_SHAPE_H
#define B2_CHAIN_SHAPE_H
 
#include "b2_api.h"
#include "b2_shape.h"
 
class b2EdgeShape;
 
class B2_API b2ChainShape : public b2Shape
{
public:
    b2ChainShape();
 
    ~b2ChainShape();
 
    void Clear();
 
    void CreateLoop(const b2Vec2* vertices, int32 count);
 
    void CreateChain(const b2Vec2* vertices, int32 count,
        const b2Vec2& prevVertex, const b2Vec2& nextVertex);
 
    b2Shape* Clone(b2BlockAllocator* allocator) const override;
 
    int32 GetChildCount() const override;
 
    void GetChildEdge(b2EdgeShape* edge, int32 index) const;
 
    bool TestPoint(const b2Transform& transform, const b2Vec2& p) const override;
 
    bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input,
                    const b2Transform& transform, int32 childIndex) const override;
 
    void ComputeAABB(b2AABB* aabb, const b2Transform& transform, int32 childIndex) const override;
 
    void ComputeMass(b2MassData* massData, float density) const override;
 
    b2Vec2* m_vertices;
 
    int32 m_count;
 
    b2Vec2 m_prevVertex, m_nextVertex;
};
 
inline b2ChainShape::b2ChainShape()
{
    m_type = e_chain;
    m_radius = b2_polygonRadius;
    m_vertices = nullptr;
    m_count = 0;
}
 
#endif