Package 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.

Author:

Daniel Murphy

Repolink:

Github: erincatto/box2d src/collision/b2_collide_circle.cpp

Field Summary

Fields

Modifier and Type	Field	Description
final Vec2	p

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

radius, type

Constructor Summary

Constructors

Constructor	Description
CircleShape()

Method Summary

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

p

public final Vec2 p

Constructor Details

CircleShape

public CircleShape()

Method Details

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

getSupport

public final int getSupport(Vec2 d)

Get the supporting vertex index in the given direction.

getSupportVertex

public final Vec2 getSupportVertex(Vec2 d)

Get the supporting vertex in the given direction.

getVertexCount

public final int getVertexCount()

Get the vertex count.

getVertex

public final Vec2 getVertex(int index)

Get a vertex by index.

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.

computeDistanceToOut

public float computeDistanceToOut(Transform xf,
 Vec2 p,
 int childIndex,
 Vec2 normalOut)

Description copied from class: Shape

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

Specified by:

computeDistanceToOut in class Shape

Parameters:

xf - The shape world transform.

p - A point in world coordinates.

normalOut - Returns the direction in which the distance increases.

Returns:

distance returns the distance from the current shape.

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

Parameters:

output - The ray-cast results.

input - The ray-cast input parameters.

transform - The transform to be applied to the shape.

childIndex - The child shape index

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

Parameters:

aabb - Returns the axis aligned box.

transform - The world transform of the 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.