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The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2011 See AUTHORS file./*www.  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;

/**
 * Contact impulses for reporting. Impulses are used instead of forces because
 * sub-step forces may approach infinity for rigid body collisions. These match
 * up one-to-one with the contact points in b2Manifold.
 * 
 * @author mzechner
 */
public class ContactImpulse {
    /*
     * JNI #include <Box2D/Box2D.h>
     */

    final World world;
    long addr;
    float[] tmp = new float[2];
    final float[] normalImpulses = new float[2];
    final float[] tangentImpulses = new float[2];

    protected ContactImpulse(World world, long addr) {
        this.world = world;
        this.addr = addr;
    }

    public float[] getNormalImpulses() {
        jniGetNormalImpulses(addr, normalImpulses);
        return normalImpulses;
    }

    private native void jniGetNormalImpulses(long addr, float[] values); /*
                                                                          * b2ContactImpulse
                                                                          * *
                                                                          * contactImpulse
                                                                          * = (
                                                                          * b2ContactImpulse
                                                                          * *
                                                                          * )addr
                                                                          * ;
                                                                          * values
                                                                          * [0]
                                                                          * =
                                                                          * contactImpulse
                                                                          * ->
                                                                          * normalImpulses
                                                                          * [0];
                                                                          * values
                                                                          * [1]
                                                                          * =
                                                                          * contactImpulse
                                                                          * ->
                                                                          * normalImpulses
                                                                          * [1];
                                                                          */

    public float[] getTangentImpulses() {
        jniGetTangentImpulses(addr, tangentImpulses);
        return tangentImpulses;
    }

    private native void jniGetTangentImpulses(long addr, float[] values); /*
                                                                           * b2ContactImpulse
                                                                           * *
                                                                           * contactImpulse
                                                                           * = (
                                                                           * b2ContactImpulse
                                                                           * *
                                                                           * )addr
                                                                           * ;
                                                                           * values
                                                                           * [0]
                                                                           * =
                                                                           * contactImpulse
                                                                           * ->
                                                                           * tangentImpulses
                                                                           * [
                                                                           * 0];
                                                                           * values
                                                                           * [1]
                                                                           * =
                                                                           * contactImpulse
                                                                           * ->
                                                                           * tangentImpulses
                                                                           * [
                                                                           * 1];
                                                                           */

    public int getCount() {
        return jniGetCount(addr);
    }

    private native int jniGetCount(long addr); /*
                                                * b2ContactImpulse*
                                                * contactImpulse =
                                                * (b2ContactImpulse*)addr;
                                                * return contactImpulse->count;
                                                */
}

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