/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* 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 {
// @off
/*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;
*/
}