b2RevoluteJointDef Struct Reference

Revolute joint definition. More...

List of all members.

Public Member Functions
void	Initialize (b2Body *body1, b2Body *body2, const b2Vec2 &anchor)
	Initialize the bodies, anchors, and reference angle using the world anchor.
Public Attributes
b2Vec2	localAnchor1
	The local anchor point relative to body1's origin.
b2Vec2	localAnchor2
	The local anchor point relative to body2's origin.
float32	referenceAngle
	The body2 angle minus body1 angle in the reference state (radians).
bool	enableLimit
	A flag to enable joint limits.
float32	lowerAngle
	The lower angle for the joint limit (radians).
float32	upperAngle
	The upper angle for the joint limit (radians).
bool	enableMotor
	A flag to enable the joint motor.
float32	motorSpeed
	The desired motor speed. Usually in radians per second.
float32	maxMotorTorque
	The maximum motor torque used to achieve the desired motor speed.

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Detailed Description

Revolute joint definition.

This requires defining an anchor point where the bodies are joined. The definition uses local anchor points so that the initial configuration can violate the constraint slightly. You also need to specify the initial relative angle for joint limits. This helps when saving and loading a game. The local anchor points are measured from the body's origin rather than the center of mass because: 1. you might not know where the center of mass will be. 2. if you add/remove shapes from a body and recompute the mass, the joints will be broken.

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Member Function Documentation

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Member Data Documentation

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The documentation for this struct was generated from the following files:

• b2RevoluteJoint.h
• b2RevoluteJoint.cpp

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Generated on Sun Apr 13 15:21:27 2008 for Box2D by  1.5.4