org.jbox2d.dynamics.joints
Class DistanceJointDef

java.lang.Object
  org.jbox2d.dynamics.joints.JointDef
      org.jbox2d.dynamics.joints.DistanceJointDef

public class DistanceJointDef
extends JointDef

Distance joint definition. This requires defining an anchor point on both bodies and the non-zero length of the distance joint. The definition uses local anchor points so that the initial configuration can violate the constraint slightly. This helps when saving and loading a game.

Field Summary

float	dampingRatio The damping ratio.
float	frequencyHz The mass-spring-damper frequency in Hertz.
float	length The equilibrium length between the anchor points.
Vec2	localAnchorA The local anchor point relative to body1's origin.
Vec2	localAnchorB The local anchor point relative to body2's origin.

Fields inherited from class org.jbox2d.dynamics.joints.JointDef

bodyA, bodyB, collideConnected, type, userData

Constructor Summary

DistanceJointDef()

Method Summary

void	initialize(Body b1, Body b2, Vec2 anchor1, Vec2 anchor2) Initialize the bodies, anchors, and length using the world anchors.

Methods inherited from class java.lang.Object

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

Field Detail

localAnchorA

public final Vec2 localAnchorA

The local anchor point relative to body1's origin.

localAnchorB

public final Vec2 localAnchorB

The local anchor point relative to body2's origin.

length

public float length

The equilibrium length between the anchor points.

frequencyHz

public float frequencyHz

The mass-spring-damper frequency in Hertz.

dampingRatio

public float dampingRatio

The damping ratio. 0 = no damping, 1 = critical damping.

Constructor Detail

DistanceJointDef

public DistanceJointDef()

Method Detail

initialize

public void initialize(Body b1,
                       Body b2,
                       Vec2 anchor1,
                       Vec2 anchor2)

Initialize the bodies, anchors, and length using the world anchors.

Parameters:

b1 - First body

b2 - Second body

anchor1 - World anchor on first body

anchor2 - World anchor on second body