#include <b2PolygonShape.h>

Inherits b2Shape.

Public Member Functions
b2Shape *	Clone (b2BlockAllocator *allocator) const
	Implement b2Shape.

int32	GetChildCount () const

void	Set (const b2Vec2 *points, int32 count)

void	SetAsBox (float32 hx, float32 hy)

void	SetAsBox (float32 hx, float32 hy, const b2Vec2 &center, float32 angle)

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

int32	GetVertexCount () const
	Get the vertex count.

const b2Vec2 &	GetVertex (int32 index) const
	Get a vertex by index.

bool	Validate () const

Public Member Functions inherited from b2Shape
Type	GetType () const

Public Attributes
b2Vec2	m_centroid

b2Vec2	m_vertices [b2_maxPolygonVertices]

b2Vec2	m_normals [b2_maxPolygonVertices]

int32	m_count

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 convex polygon. It is assumed that the interior of the polygon is to the left of each edge. Polygons have a maximum number of vertices equal to b2_maxPolygonVertices. In most cases you should not need many vertices for a convex polygon.

Member Function Documentation

void b2PolygonShape::ComputeAABB	(	b2AABB *	aabb,
		const b2Transform &	transform,
		int32	childIndex
	)		const

virtual

See Also: b2Shape::ComputeAABB

Implements b2Shape.

void b2PolygonShape::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 b2PolygonShape::ComputeMass	(	b2MassData *	massData,
		float32	density
	)		const

virtual

See Also: b2Shape::ComputeMass

Implements b2Shape.

int32 b2PolygonShape::GetChildCount ( ) const

virtual

See Also: b2Shape::GetChildCount

Implements b2Shape.

void b2PolygonShape::Set	(	const b2Vec2 *	points,
		int32	count
	)

Create a convex hull from the given array of local points. The count must be in the range [3, b2_maxPolygonVertices].

Warning: the points may be re-ordered, even if they form a convex polygon; collinear points are handled but not removed. Collinear points may lead to poor stacking behavior.

void b2PolygonShape::SetAsBox	(	float32	hx,
		float32	hy
	)

Build vertices to represent an axis-aligned box centered on the local origin.

Parameters

hx	the half-width.
hy	the half-height.

void b2PolygonShape::SetAsBox	(	float32	hx,
		float32	hy,
		const b2Vec2 &	center,
		float32	angle
	)

Build vertices to represent an oriented box.

Parameters

hx	the half-width.
hy	the half-height.
center	the center of the box in local coordinates.
angle	the rotation of the box in local coordinates.

bool b2PolygonShape::TestPoint	(	const b2Transform &	transform,
		const b2Vec2 &	p
	)		const

virtual

See Also: b2Shape::TestPoint

Implements b2Shape.

bool b2PolygonShape::Validate ( ) const

Validate convexity. This is a very time consuming operation.

Returns: true if valid

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

b2PolygonShape.h
b2PolygonShape.cpp

Public Member Functions

Public Attributes

Additional Inherited Members

Detailed Description

Member Function Documentation