b2Shape.h
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- /*
- * Copyright (c) 2006-2009 Erin Catto http://www.gphysics.com
- *
- * 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.
- class b2Shape
- {
- public:
-
- enum Type
- {
- e_unknown= -1,
- e_circle = 0,
- e_polygon = 1,
- e_typeCount = 2,
- };
- b2Shape() { m_type = e_unknown; }
- 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;
- /// 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 this shape.
- /// @param output the ray-cast results.
- /// @param input the ray-cast input parameters.
- /// @param transform the transform to be applied to the shape.
- virtual bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input, const b2Transform& transform) const = 0;
- /// Given a transform, compute the associated axis aligned bounding box for this shape.
- /// @param aabb returns the axis aligned box.
- /// @param xf the world transform of the shape.
- virtual void ComputeAABB(b2AABB* aabb, const b2Transform& xf) 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;
- float32 m_radius;
- };
- inline b2Shape::Type b2Shape::GetType() const
- {
- return m_type;
- }
- #endif