com.badlogic.gdx.physics.box2d.joints.DistanceJoint Maven / Gradle / Ivy
/*******************************************************************************
* 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.joints;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Joint;
import com.badlogic.gdx.physics.box2d.World;
/** A distance joint constrains two points on two bodies to remain at a fixed distance from each other. You can view this as a
* massless, rigid rod. */
public class DistanceJoint extends Joint {
// @off
/*JNI
#include
*/
private final float[] tmp = new float[2];
private final Vector2 localAnchorA = new Vector2();
private final Vector2 localAnchorB = new Vector2();
public DistanceJoint (World world, long addr) {
super(world, addr);
}
public Vector2 getLocalAnchorA () {
jniGetLocalAnchorA(addr, tmp);
localAnchorA.set(tmp[0], tmp[1]);
return localAnchorA;
}
private native void jniGetLocalAnchorA (long addr, float[] anchor); /*
b2DistanceJoint* joint = (b2DistanceJoint*)addr;
anchor[0] = joint->GetLocalAnchorA().x;
anchor[1] = joint->GetLocalAnchorA().y;
*/
public Vector2 getLocalAnchorB () {
jniGetLocalAnchorB(addr, tmp);
localAnchorB.set(tmp[0], tmp[1]);
return localAnchorB;
}
private native void jniGetLocalAnchorB (long addr, float[] anchor); /*
b2DistanceJoint* joint = (b2DistanceJoint*)addr;
anchor[0] = joint->GetLocalAnchorB().x;
anchor[1] = joint->GetLocalAnchorB().y;
*/
/** Set/get the natural length. Manipulating the length can lead to non-physical behavior when the frequency is zero. */
public void setLength (float length) {
jniSetLength(addr, length);
}
private native void jniSetLength (long addr, float length); /*
b2DistanceJoint* joint = (b2DistanceJoint*)addr;
joint->SetLength( length );
*/
/** Set/get the natural length. Manipulating the length can lead to non-physical behavior when the frequency is zero. */
public float getLength () {
return jniGetLength(addr);
}
private native float jniGetLength (long addr); /*
b2DistanceJoint* joint = (b2DistanceJoint*)addr;
return joint->GetLength();
*/
/** Set/get frequency in Hz. */
public void setFrequency (float hz) {
jniSetFrequency(addr, hz);
}
private native void jniSetFrequency (long addr, float hz); /*
b2DistanceJoint* joint = (b2DistanceJoint*)addr;
joint->SetFrequency( hz );
*/
/** Set/get frequency in Hz. */
public float getFrequency () {
return jniGetFrequency(addr);
}
private native float jniGetFrequency (long addr); /*
b2DistanceJoint* joint = (b2DistanceJoint*)addr;
return joint->GetFrequency();
*/
/** Set/get damping ratio. */
public void setDampingRatio (float ratio) {
jniSetDampingRatio(addr, ratio);
}
private native void jniSetDampingRatio (long addr, float ratio); /*
b2DistanceJoint* joint = (b2DistanceJoint*)addr;
joint->SetDampingRatio( ratio );
*/
/** Set/get damping ratio. */
public float getDampingRatio () {
return jniGetDampingRatio(addr);
}
private native float jniGetDampingRatio (long addr); /*
b2DistanceJoint* joint = (b2DistanceJoint*)addr;
return joint->GetDampingRatio();
*/
}