Android Open Source - gameengine Rope Joint

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The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2011 See AUTHORS file./*w w w  .  j  a  v a  2s. 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 rope joint enforces a maximum distance between two points on two bodies. It
 * has no other effect. Warning: if you attempt to change the maximum length
 * during the simulation you will get some non-physical behavior. A model that
 * would allow you to dynamically modify the length would have some sponginess,
 * so I chose not to implement it that way. See b2DistanceJoint if you want to
 * dynamically control length.
 */
public class RopeJoint extends Joint {
    /*
     * JNI #include <Box2D/Box2D.h>
     */

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

    /** Get the maximum length of the rope. */
    public float getMaxLength() {
        return jniGetMaxLength(addr);
    }

    private native float jniGetMaxLength(long addr); /*
                                                      * b2RopeJoint* rope =
                                                      * (b2RopeJoint*)addr;
                                                      * return
                                                      * rope->GetMaxLength();
                                                      */
}

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