/* * 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_POLYGON_SHAPE_H #define B2_POLYGON_SHAPE_H #include <Box2D/Collision/Shapes/b2Shape.h> /// A convex polygon. It is assumed that the interior of the polygon is to /// the left of each edge. /// Polygons have a maximum number of vertices equal to b2_maxPolygonVertices. /// In most cases you should not need many vertices for a convex polygon. class b2PolygonShape : public b2Shape { public: b2PolygonShape(); /// Implement b2Shape. b2Shape* Clone(b2BlockAllocator* allocator) const; /// @see b2Shape::GetChildCount int32 GetChildCount() const; /// Copy vertices. This assumes the vertices define a convex polygon. /// It is assumed that the exterior is the the right of each edge. /// The count must be in the range [3, b2_maxPolygonVertices]. void Set(const b2Vec2* vertices, int32 vertexCount); /// Build vertices to represent an axis-aligned box. /// @param hx the half-width. /// @param hy the half-height. void SetAsBox(float32 hx, float32 hy); /// Build vertices to represent an oriented box. /// @param hx the half-width. /// @param hy the half-height. /// @param center the center of the box in local coordinates. /// @param angle the rotation of the box in local coordinates. void SetAsBox(float32 hx, float32 hy, const b2Vec2& center, float32 angle); /// @see b2Shape::TestPoint 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 vertex count. int32 GetVertexCount() const { return m_vertexCount; } /// Get a vertex by index. const b2Vec2& GetVertex(int32 index) const; b2Vec2 m_centroid; b2Vec2 m_vertices[b2_maxPolygonVertices]; b2Vec2 m_normals[b2_maxPolygonVertices]; int32 m_vertexCount; }; inline b2PolygonShape::b2PolygonShape() { m_type = e_polygon; m_radius = b2_polygonRadius; m_vertexCount = 0; m_centroid.SetZero(); } inline const b2Vec2& b2PolygonShape::GetVertex(int32 index) const { b2Assert(0 <= index && index < m_vertexCount); return m_vertices[index]; } #endif