b2PolygonShape.h

/*
* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
* Copyright (c) 2013 Google, Inc.
*
* 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_POLYGON_SHAPE_H
#define B2_POLYGON_SHAPE_H

#include <Box2D/Collision/Shapes/b2Shape.h>

class b2PolygonShape : public b2Shape
{
public:
    b2PolygonShape();

    b2Shape* Clone(b2BlockAllocator* allocator) const;

    int32 GetChildCount() const;

    void Set(const b2Vec2* points, int32 count);

    void SetAsBox(float32 hx, float32 hy);

    void SetAsBox(float32 hx, float32 hy, const b2Vec2& center, float32 angle);

    bool TestPoint(const b2Transform& transform, const b2Vec2& p) const;

    // @see b2Shape::ComputeDistance
    void ComputeDistance(const b2Transform& xf, const b2Vec2& p, float32* distance, b2Vec2* normal, int32 childIndex) const;

    bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input,
                    const b2Transform& transform, int32 childIndex) const;

    void ComputeAABB(b2AABB* aabb, const b2Transform& transform, int32 childIndex) const;

    void ComputeMass(b2MassData* massData, float32 density) const;

    int32 GetVertexCount() const { return m_count; }

    const b2Vec2& GetVertex(int32 index) const;

    bool Validate() const;

#if LIQUIDFUN_EXTERNAL_LANGUAGE_API
public:
    void SetCentroid(float32 x, float32 y);

    void SetAsBox(float32 hx,
                                float32 hy,
                                float32 centerX,
                                float32 centerY,
                                float32 angle);
#endif // LIQUIDFUN_EXTERNAL_LANGUAGE_API

    b2Vec2 m_centroid;
    b2Vec2 m_vertices[b2_maxPolygonVertices];
    b2Vec2 m_normals[b2_maxPolygonVertices];
    int32 m_count;
};

inline b2PolygonShape::b2PolygonShape()
{
    m_type = e_polygon;
    m_radius = b2_polygonRadius;
    m_count = 0;
    m_centroid.SetZero();
}

inline const b2Vec2& b2PolygonShape::GetVertex(int32 index) const
{
    b2Assert(0 <= index && index < m_count);
    return m_vertices[index];
}

#if LIQUIDFUN_EXTERNAL_LANGUAGE_API
inline void b2PolygonShape::SetCentroid(float32 x, float32 y)
{
    m_centroid.Set(x, y);
}

inline void b2PolygonShape::SetAsBox(float32 hx,
                                         float32 hy,
                                         float32 centerX,
                                         float32 centerY,
                                         float32 angle) {
    SetAsBox(hx, hy, b2Vec2(centerX, centerY), angle);
}
#endif // LIQUIDFUN_EXTERNAL_LANGUAGE_API

#endif