Package org.jbox2d.collision.shapes

Class EdgeShape

java.lang.Object

org.jbox2d.collision.shapes.Shape

org.jbox2d.collision.shapes.EdgeShape

public class EdgeShape
extends Shape

A line segment (edge) shape. These can be connected in chains or loops to other edge shapes. The connectivity information is used to ensure correct contact normals.

Author:

Daniel Murphy

Repolink:

Github: erincatto/box2d src/collision/b2_edge_shape.cpp

Field Summary

Fields

Modifier and Type	Field	Description
boolean	hasVertex0
boolean	hasVertex3
final Vec2	vertex0	optional adjacent vertex 1.
final Vec2	vertex1	edge vertex 1
final Vec2	vertex2	edge vertex 2
final Vec2	vertex3	optional adjacent vertex 2.

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

radius, type

Constructor Summary

Constructors

Constructor	Description
EdgeShape()

Method Summary

Modifier and Type	Method	Description
Shape	clone()
void	computeAABB(AABB aabb, Transform xf, 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.
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
boolean	raycast(RayCastOutput output, RayCastInput input, Transform xf, int childIndex)	Cast a ray against a child shape.
void	set(Vec2 v1, Vec2 v2)
boolean	testPoint(Transform xf, 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

vertex1

public final Vec2 vertex1

edge vertex 1

vertex2

public final Vec2 vertex2

edge vertex 2

vertex0

public final Vec2 vertex0

optional adjacent vertex 1. Used for smooth collision

vertex3

public final Vec2 vertex3

optional adjacent vertex 2. Used for smooth collision

hasVertex0

public boolean hasVertex0

hasVertex3

public boolean hasVertex3

Constructor Details

EdgeShape

public EdgeShape()

Method Details

getChildCount

public int getChildCount()

Description copied from class: Shape

Get the number of child primitives

Specified by:

getChildCount in class Shape

set

public void set(Vec2 v1,
 Vec2 v2)

testPoint

public boolean testPoint(Transform xf,
 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:

xf - 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 boolean raycast(RayCastOutput output,
 RayCastInput input,
 Transform xf,
 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.

xf - The transform to be applied to the shape.

childIndex - The child shape index

Returns:

if hit

computeAABB

public void computeAABB(AABB aabb,
 Transform xf,
 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.

xf - The world transform of the shape.

computeMass

public 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.

clone

public Shape clone()

Specified by:

clone in class Shape