/*******************************************************************************
* 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;
/** The pulley joint is connected to two bodies and two fixed ground points. The pulley supports a ratio such that: length1 + ratio
* * length2 <= constant Yes, the force transmitted is scaled by the ratio. The pulley also enforces a maximum length limit on
* both sides. This is useful to prevent one side of the pulley hitting the top. */
public class PulleyJoint extends Joint {
// @off
/*JNI
#include <Box2D/Box2D.h>
*/
public PulleyJoint (World world, long addr) {
super(world, addr);
}
/** Get the first ground anchor. */
private final float[] tmp = new float[2];
private final Vector2 groundAnchorA = new Vector2();
public Vector2 getGroundAnchorA () {
jniGetGroundAnchorA(addr, tmp);
groundAnchorA.set(tmp[0], tmp[1]);
return groundAnchorA;
}
private native void jniGetGroundAnchorA (long addr, float[] anchor); /*
b2PulleyJoint* joint = (b2PulleyJoint*)addr;
anchor[0] = joint->GetGroundAnchorA().x;
anchor[1] = joint->GetGroundAnchorA().y;
*/
/** Get the second ground anchor. */
private final Vector2 groundAnchorB = new Vector2();
public Vector2 getGroundAnchorB () {
jniGetGroundAnchorB(addr, tmp);
groundAnchorB.set(tmp[0], tmp[1]);
return groundAnchorB;
}
private native void jniGetGroundAnchorB (long addr, float[] anchor); /*
b2PulleyJoint* joint = (b2PulleyJoint*)addr;
anchor[0] = joint->GetGroundAnchorB().x;
anchor[1] = joint->GetGroundAnchorB().y;
*/
/** Get the current length of the segment attached to body1. */
public float getLength1 () {
return jniGetLength1(addr);
}
private native float jniGetLength1 (long addr); /*
b2PulleyJoint* joint = (b2PulleyJoint*)addr;
return joint->GetLengthA();
*/
/** Get the current length of the segment attached to body2. */
public float getLength2 () {
return jniGetLength2(addr);
}
private native float jniGetLength2 (long addr); /*
b2PulleyJoint* joint = (b2PulleyJoint*)addr;
return joint->GetLengthB();
*/
/** Get the pulley ratio. */
public float getRatio () {
return jniGetRatio(addr);
}
private native float jniGetRatio (long addr); /*
b2PulleyJoint* joint = (b2PulleyJoint*)addr;
return joint->GetRatio();
*/
}