105 lines
		
	
	
		
			3.5 KiB
		
	
	
	
		
			C
		
	
	
	
		
		
			
		
	
	
			105 lines
		
	
	
		
			3.5 KiB
		
	
	
	
		
			C
		
	
	
	
|  | /*
 | ||
|  | * 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
 |