org.jbox2d.collision.shapes

Class CircleShape

java.lang.Object

org.jbox2d.collision.shapes.Shape

org.jbox2d.collision.shapes.CircleShape

public class CircleShape
extends Shape

A circle shape.

Field Summary

Fields

Modifier and Type	Field and Description
Vec2	m_p

Fields inherited from class org.jbox2d.collision.shapes.Shape

m_radius, m_type

Constructor Summary

Constructors

Constructor and Description
CircleShape()

Method Summary

Modifier and Type	Method and Description
Shape	clone()
void	computeAABB(AABB aabb, Transform transform, int childIndex) Given a transform, compute the associated axis aligned bounding box for a child shape.
void	computeMass(MassData massData, float density) Compute the mass properties of this shape using its dimensions and density.
int	getChildCount() Get the number of child primitives
int	getSupport(Vec2 d) Get the supporting vertex index in the given direction.
Vec2	getSupportVertex(Vec2 d) Get the supporting vertex in the given direction.
Vec2	getVertex(int index) Get a vertex by index.
int	getVertexCount() Get the vertex count.
boolean	raycast(RayCastOutput output, RayCastInput input, Transform transform, int childIndex) Cast a ray against a child shape.
boolean	testPoint(Transform transform, Vec2 p) Test a point for containment in this shape.

Methods inherited from class org.jbox2d.collision.shapes.Shape

getRadius, getType, setRadius

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

m_p

public final Vec2 m_p

Constructor Detail

CircleShape

public CircleShape()

Method Detail

clone

public final Shape clone()

Specified by:

clone in class Shape

getChildCount

public final int getChildCount()

Description copied from class: Shape

Get the number of child primitives

Specified by:

getChildCount in class Shape

Returns:

getSupport

public final int getSupport(Vec2 d)

Get the supporting vertex index in the given direction.

Parameters:

d -

Returns:

getSupportVertex

public final Vec2 getSupportVertex(Vec2 d)

Get the supporting vertex in the given direction.

Parameters:

d -

Returns:

getVertexCount

public final int getVertexCount()

Get the vertex count.

Returns:

getVertex

public final Vec2 getVertex(int index)

Get a vertex by index.

Parameters:

index -

Returns:

testPoint

public final boolean testPoint(Transform transform,
                               Vec2 p)

Description copied from class: Shape

Test a point for containment in this shape. This only works for convex shapes.

Specified by:

testPoint in class Shape

Parameters:

transform - the shape world transform.

p - a point in world coordinates.

raycast

public final boolean raycast(RayCastOutput output,
                             RayCastInput input,
                             Transform transform,
                             int childIndex)

Description copied from class: Shape

Cast a ray against a child shape.

Specified by:

raycast in class Shape

Returns:

if hit

computeAABB

public final void computeAABB(AABB aabb,
                              Transform transform,
                              int childIndex)

Description copied from class: Shape

Given a transform, compute the associated axis aligned bounding box for a child shape.

Specified by:

computeAABB in class Shape

computeMass

public final void computeMass(MassData massData,
                              float density)

Description copied from class: Shape

Compute the mass properties of this shape using its dimensions and density. The inertia tensor is computed about the local origin.

Specified by:

computeMass in class Shape

Parameters:

massData - returns the mass data for this shape.

density - the density in kilograms per meter squared.