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	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
final Vec2	localAnchorA	The local anchor point relative to body1's origin.
final Vec2	localAnchorB	The local anchor point relative to body2's origin.
final 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 JointDef

bodyA, bodyB, collideConnected, type, userData

Constructor Summary

Constructors

Constructor	Description
WheelJointDef()

Method Summary

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

Methods inherited from class Object

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

Field Details

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 Details

WheelJointDef

public WheelJointDef()

Method Details

initialize

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