Android Open Source - gameengine Gear Joint

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The source code is released under:

Apache License

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Java Source Code

/*******************************************************************************
 * Copyright 2011 See AUTHORS file./*  w w w .j  a va2  s  . c o  m*/
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.physics.box2d.joints;

import com.badlogic.gdx.physics.box2d.Joint;
import com.badlogic.gdx.physics.box2d.World;

/**
 * A gear joint is used to connect two joints together. Either joint can be a
 * revolute or prismatic joint. You specify a gear ratio to bind the motions
 * together: coordinate1 + ratio * coordinate2 = constant The ratio can be
 * negative or positive. If one joint is a revolute joint and the other joint is
 * a prismatic joint, then the ratio will have units of length or units of
 * 1/length.
 * 
 * @warning The revolute and prismatic joints must be attached to fixed bodies
 *          (which must be body1 on those joints).
 */
public class GearJoint extends Joint {
    /*
     * JNI #include <Box2D/Box2D.h>
     */

    public GearJoint(World world, long addr) {
        super(world, addr);
    }

    /** Set/Get the gear ratio. */
    public void setRatio(float ratio) {
        jniSetRatio(addr, ratio);
    }

    private native void jniSetRatio(long addr, float ratio); /*
                                                              * b2GearJoint*
                                                              * joint =
                                                              * (b2GearJoint
                                                              * *)addr;
                                                              * joint->SetRatio(
                                                              * ratio );
                                                              */

    /** Set/Get the gear ratio. */
    public float getRatio() {
        return jniGetRatio(addr);
    }

    private native float jniGetRatio(long addr); /*
                                                  * b2GearJoint* joint =
                                                  * (b2GearJoint*)addr; return
                                                  * joint->GetRatio();
                                                  */
}

Java Source Code List