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A 2D java physics engine, a port of the C++ Box2d engine. This is the core physics engine.
/*******************************************************************************
* Copyright (c) 2011, Daniel Murphy
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
******************************************************************************/
/**
* Created at 7:27:31 AM Jan 21, 2011
*/
package org.jbox2d.dynamics.joints;
import org.jbox2d.common.Vec2;
import org.jbox2d.dynamics.Body;
/**
* @author Daniel Murphy
*/
public class LineJointDef extends JointDef {
/**
* The local anchor point relative to body1's origin.
*/
public final Vec2 localAnchorA = new Vec2();
/**
* The local anchor point relative to body2's origin.
*/
public final Vec2 localAnchorB = new Vec2();
/**
* The local translation axis in body1.
*/
public final Vec2 localAxisA = new Vec2();
/**
* Enable/disable the joint limit.
*/
public boolean enableLimit;
/**
* The lower translation limit, usually in meters.
*/
public float lowerTranslation;
/**
* The upper translation limit, usually in meters.
*/
public float upperTranslation;
/**
* Enable/disable the joint motor.
*/
public boolean enableMotor;
/**
* The maximum motor torque, usually in N-m.
*/
public float maxMotorForce;
/**
* The desired motor speed in radians per second.
*/
public float motorSpeed;
public LineJointDef() {
type = JointType.LINE;
localAxisA.set(1, 0);
enableLimit = false;
lowerTranslation = 0;
upperTranslation = 0;
enableMotor = false;
maxMotorForce = 0f;
motorSpeed = 0f;
}
public void initialize(Body b1, Body b2, Vec2 anchor, Vec2 axis) {
bodyA = b1;
bodyB = b2;
b1.getLocalPointToOut(anchor, localAnchorA);
b2.getLocalPointToOut(anchor, localAnchorB);
bodyA.getLocalVectorToOut(axis, localAxisA);
}
}