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-/*
-* 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_SHAPE_H
-#define B2_SHAPE_H
-
-#include "Box2D/Common/b2BlockAllocator.h"
-#include "Box2D/Common/b2Math.h"
-#include "Box2D/Collision/b2Collision.h"
-
-/// This holds the mass data computed for a shape.
-struct b2MassData
-{
- /// The mass of the shape, usually in kilograms.
- float32 mass;
-
- /// The position of the shape's centroid relative to the shape's origin.
- b2Vec2 center;
-
- /// The rotational inertia of the shape about the local origin.
- float32 I;
-};
-
-/// A shape is used for collision detection. You can create a shape however you like.
-/// Shapes used for simulation in b2World are created automatically when a b2Fixture
-/// is created. Shapes may encapsulate a one or more child shapes.
-class b2Shape
-{
-public:
-
- enum Type
- {
- e_circle = 0,
- e_edge = 1,
- e_polygon = 2,
- e_chain = 3,
- e_typeCount = 4
- };
-
- virtual ~b2Shape() {}
-
- /// Clone the concrete shape using the provided allocator.
- virtual b2Shape* Clone(b2BlockAllocator* allocator) const = 0;
-
- /// Get the type of this shape. You can use this to down cast to the concrete shape.
- /// @return the shape type.
- Type GetType() const;
-
- /// Get the number of child primitives.
- virtual int32 GetChildCount() const = 0;
-
- /// Test a point for containment in this shape. This only works for convex shapes.
- /// @param xf the shape world transform.
- /// @param p a point in world coordinates.
- virtual bool TestPoint(const b2Transform& xf, const b2Vec2& p) const = 0;
-
- /// Cast a ray against a child shape.
- /// @param output the ray-cast results.
- /// @param input the ray-cast input parameters.
- /// @param transform the transform to be applied to the shape.
- /// @param childIndex the child shape index
- virtual bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input,
- const b2Transform& transform, int32 childIndex) const = 0;
-
- /// Given a transform, compute the associated axis aligned bounding box for a child shape.
- /// @param aabb returns the axis aligned box.
- /// @param xf the world transform of the shape.
- /// @param childIndex the child shape
- virtual void ComputeAABB(b2AABB* aabb, const b2Transform& xf, int32 childIndex) const = 0;
-
- /// Compute the mass properties of this shape using its dimensions and density.
- /// The inertia tensor is computed about the local origin.
- /// @param massData returns the mass data for this shape.
- /// @param density the density in kilograms per meter squared.
- virtual void ComputeMass(b2MassData* massData, float32 density) const = 0;
-
- Type m_type;
-
- /// Radius of a shape. For polygonal shapes this must be b2_polygonRadius. There is no support for
- /// making rounded polygons.
- float32 m_radius;
-};
-
-inline b2Shape::Type b2Shape::GetType() const
-{
- return m_type;
-}
-
-#endif