b2_chain_shape.h

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// 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