#include <b2ChainShape.h>

Inherits b2Shape.

Public Member Functions
	~b2ChainShape ()
	The destructor frees the vertices using b2Free.

void	CreateLoop (const b2Vec2 *vertices, int32 count)

void	CreateChain (const b2Vec2 *vertices, int32 count)

void	SetPrevVertex (const b2Vec2 &prevVertex)

void	SetNextVertex (const b2Vec2 &nextVertex)

b2Shape *	Clone (b2BlockAllocator *allocator) const
	Implement b2Shape. Vertices are cloned using b2Alloc.

int32	GetChildCount () const

void	GetChildEdge (b2EdgeShape *edge, int32 index) const
	Get a child edge.

bool	TestPoint (const b2Transform &transform, const b2Vec2 &p) const

void	ComputeDistance (const b2Transform &xf, const b2Vec2 &p, float32 distance, b2Vec2 normal, int32 childIndex) const

bool	RayCast (b2RayCastOutput *output, const b2RayCastInput &input, const b2Transform &transform, int32 childIndex) const
	Implement b2Shape.

void	ComputeAABB (b2AABB *aabb, const b2Transform &transform, int32 childIndex) const

void	ComputeMass (b2MassData *massData, float32 density) const

Public Member Functions inherited from b2Shape
Type	GetType () const

Public Attributes
b2Vec2 *	m_vertices
	The vertices. Owned by this class.

int32	m_count
	The vertex count.

b2Vec2	m_prevVertex

b2Vec2	m_nextVertex

bool	m_hasPrevVertex

bool	m_hasNextVertex

Public Attributes inherited from b2Shape
Type	m_type

float32	m_radius

Additional Inherited Members
Public Types inherited from b2Shape
enum	Type { e_circle = 0, e_edge = 1, e_polygon = 2, e_chain = 3, e_typeCount = 4 }

Detailed Description

A chain shape is a free form sequence of line segments. The chain has two-sided collision, so you can use inside and outside collision. Therefore, you may use any winding order. Since there may be many vertices, they are allocated using b2Alloc. Connectivity information is used to create smooth collisions. WARNING: The chain will not collide properly if there are self-intersections.

Member Function Documentation

void b2ChainShape::ComputeAABB	(	b2AABB *	aabb,
		const b2Transform &	transform,
		int32	childIndex
	)		const

virtual

See Also: b2Shape::ComputeAABB

Implements b2Shape.

void b2ChainShape::ComputeDistance	(	const b2Transform &	xf,
		const b2Vec2 &	p,
		float32 *	distance,
		b2Vec2 *	normal,
		int32	childIndex
	)		const

virtual

Compute the distance from the current shape to the specified point. This only works for convex shapes.

Parameters

xf	the shape world transform.
p	a point in world coordinates.
distance	returns the distance from the current shape.
normal	returns the direction in which the distance increases.

Implements b2Shape.

void b2ChainShape::ComputeMass	(	b2MassData *	massData,
		float32	density
	)		const

virtual

Chains have zero mass.

See Also: b2Shape::ComputeMass

Implements b2Shape.

void b2ChainShape::CreateChain	(	const b2Vec2 *	vertices,
		int32	count
	)

Create a chain with isolated end vertices.

Parameters

vertices	an array of vertices, these are copied
count	the vertex count

void b2ChainShape::CreateLoop	(	const b2Vec2 *	vertices,
		int32	count
	)

Create a loop. This automatically adjusts connectivity.

Parameters

vertices	an array of vertices, these are copied
count	the vertex count

int32 b2ChainShape::GetChildCount ( ) const

virtual

See Also: b2Shape::GetChildCount

Implements b2Shape.

void b2ChainShape::SetNextVertex ( const b2Vec2 & nextVertex )

Establish connectivity to a vertex that follows the last vertex. Don't call this for loops.

void b2ChainShape::SetPrevVertex ( const b2Vec2 & prevVertex )

Establish connectivity to a vertex that precedes the first vertex. Don't call this for loops.

bool b2ChainShape::TestPoint	(	const b2Transform &	transform,
		const b2Vec2 &	p
	)		const

virtual

This always return false.

See Also: b2Shape::TestPoint

Implements b2Shape.

The documentation for this class was generated from the following files:

b2ChainShape.h
b2ChainShape.cpp

Public Member Functions

Public Attributes

Additional Inherited Members

Detailed Description

Member Function Documentation