com.badlogic.gdx.physics.box2d.joints.DistanceJoint Maven / Gradle / Ivy

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/*******************************************************************************
 * 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 stiffness.
   */
  public void setStiffness(float stiffness) {
    jniSetStiffness(addr, stiffness);
  }

  private native void jniSetStiffness(long addr, float stiffness); /*
		b2DistanceJoint* joint = (b2DistanceJoint*)addr;
		joint->SetStiffness( stiffness );
	*/

  /**
   * Set/get stiffness.
   */
  public float getStiffness() {
    return jniGetStiffness(addr);
  }

  private native float jniGetStiffness(long addr); /*
		b2DistanceJoint* joint = (b2DistanceJoint*)addr;
		return joint->GetStiffness();
	*/

  /**
   * Set/get damping.
   */
  public void setDamping(float damping) {
    jniSetDamping(addr, damping);
  }

  private native void jniSetDamping(long addr, float damping); /*
		b2DistanceJoint* joint = (b2DistanceJoint*)addr;
		joint->SetDamping( damping );
	*/

  /**
   * Set/get damping.
   */
  public float getDamping() {
    return jniGetDamping(addr);
  }

  private native float jniGetDamping(long addr); /*
		b2DistanceJoint* joint = (b2DistanceJoint*)addr;
		return joint->GetDamping();
	*/
}