org.jbox2d.dynamics.joints

Class WheelJointDef

java.lang.Object

org.jbox2d.dynamics.joints.JointDef

org.jbox2d.dynamics.joints.WheelJointDef

public class WheelJointDef
extends JointDef

Wheel joint definition. This requires defining a line of motion using an axis and an anchor point. The definition uses local anchor points and a local axis so that the initial configuration can violate the constraint slightly. The joint translation is zero when the local anchor points coincide in world space. Using local anchors and a local axis helps when saving and loading a game.

Author:

Daniel Murphy

Field Summary

Fields

Modifier and Type	Field and Description
float	dampingRatio Suspension damping ratio, one indicates critical damping
boolean	enableMotor Enable/disable the joint motor.
float	frequencyHz Suspension frequency, zero indicates no suspension
Vec2	localAnchorA The local anchor point relative to body1's origin.
Vec2	localAnchorB The local anchor point relative to body2's origin.
Vec2	localAxisA The local translation axis in body1.
float	maxMotorTorque The maximum motor torque, usually in N-m.
float	motorSpeed The desired motor speed in radians per second.

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

bodyA, bodyB, collideConnected, type, userData

Constructor Summary

Constructors

Constructor and Description
WheelJointDef()

Method Summary

Modifier and Type	Method and Description
void	initialize(Body b1, Body b2, Vec2 anchor, Vec2 axis)

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.

localAxisA

public final Vec2 localAxisA

The local translation axis in body1.

enableMotor

public boolean enableMotor

Enable/disable the joint motor.

maxMotorTorque

public float maxMotorTorque

The maximum motor torque, usually in N-m.

motorSpeed

public float motorSpeed

The desired motor speed in radians per second.

frequencyHz

public float frequencyHz

Suspension frequency, zero indicates no suspension

dampingRatio

public float dampingRatio

Suspension damping ratio, one indicates critical damping

Constructor Detail

WheelJointDef

public WheelJointDef()

Method Detail

initialize

public void initialize(Body b1,
                       Body b2,
                       Vec2 anchor,
                       Vec2 axis)