mirror of https://github.com/axmolengine/axmol.git
102 lines
3.6 KiB
C++
102 lines
3.6 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;
|
|
float32 m_radius;
|
|
};
|
|
|
|
inline b2Shape::Type b2Shape::GetType() const
|
|
{
|
|
return m_type;
|
|
}
|
|
|
|
#endif
|