Android Open Source - gameengine Distance Joint Def

• Back to Game/engine  ↑

From Project

Back to project page gameengine.

License

The source code is released under:

Apache License

Java Source Code

/*******************************************************************************
 * Copyright 2011 See AUTHORS file.// w ww  .  j  ava2s . c  om
 * 
 * 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.Body;
import com.badlogic.gdx.physics.box2d.JointDef;

/**
 * Distance joint definition. This requires defining an anchor point on both
 * bodies and the non-zero length of the distance joint. The definition uses
 * local anchor points so that the initial configuration can violate the
 * constraint slightly. This helps when saving and loading a game.
 * 
 * @warning Do not use a zero or short length.
 */
public class DistanceJointDef extends JointDef {
    public DistanceJointDef() {
        type = JointType.DistanceJoint;
    }

    /** Initialize the bodies, anchors, and length using the world anchors. */
    public void initialize(Body bodyA, Body bodyB, Vector2 anchorA, Vector2 anchorB) {
        this.bodyA = bodyA;
        this.bodyB = bodyB;
        this.localAnchorA.set(bodyA.getLocalPoint(anchorA));
        this.localAnchorB.set(bodyB.getLocalPoint(anchorB));
        this.length = anchorA.dst(anchorB);
    }

    /** The local anchor point relative to body1's origin. */
    public final Vector2 localAnchorA = new Vector2();

    /** The local anchor point relative to body2's origin. */
    public final Vector2 localAnchorB = new Vector2();

    /** The natural length between the anchor points. */
    public float length = 1;

    /** The mass-spring-damper frequency in Hertz. */
    public float frequencyHz = 0;

    /** The damping ratio. 0 = no damping, 1 = critical damping. */
    public float dampingRatio = 0;
}

Java Source Code List

• Back to Game/engine  ↑