com.badlogic.gdx.physics.box2d.Joint.java Source code

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Here is the source code for com.badlogic.gdx.physics.box2d.Joint.java

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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;

import org.jbox2d.common.Vec2;

import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.JointDef.JointType;

public abstract class Joint {
    World world;
    org.jbox2d.dynamics.joints.Joint joint;
    Object userData;
    JointEdge jointEdgeA;
    JointEdge jointEdgeB;

    /** Constructs a new joint
     * @param addr the address of the joint */
    protected Joint(World world, org.jbox2d.dynamics.joints.Joint joint) {
        this.world = world;
        this.joint = joint;
    }

    /** Get the type of the concrete joint. */
    public JointType getType() {
        org.jbox2d.dynamics.joints.JointType type2 = joint.getType();
        if (type2 == org.jbox2d.dynamics.joints.JointType.DISTANCE)
            return JointType.DistanceJoint;
        if (type2 == org.jbox2d.dynamics.joints.JointType.FRICTION)
            return JointType.FrictionJoint;
        if (type2 == org.jbox2d.dynamics.joints.JointType.GEAR)
            return JointType.GearJoint;
        if (type2 == org.jbox2d.dynamics.joints.JointType.MOUSE)
            return JointType.MouseJoint;
        if (type2 == org.jbox2d.dynamics.joints.JointType.PRISMATIC)
            return JointType.PrismaticJoint;
        if (type2 == org.jbox2d.dynamics.joints.JointType.PULLEY)
            return JointType.PulleyJoint;
        if (type2 == org.jbox2d.dynamics.joints.JointType.REVOLUTE)
            return JointType.RevoluteJoint;
        if (type2 == org.jbox2d.dynamics.joints.JointType.ROPE)
            return JointType.RopeJoint;
        if (type2 == org.jbox2d.dynamics.joints.JointType.UNKNOWN)
            return JointType.Unknown;
        if (type2 == org.jbox2d.dynamics.joints.JointType.WELD)
            return JointType.WeldJoint;
        if (type2 == org.jbox2d.dynamics.joints.JointType.WHEEL)
            return JointType.WheelJoint;
        return JointType.Unknown;
    }

    /** Get the first body attached to this joint. */
    public Body getBodyA() {
        return world.bodies.get(joint.getBodyA());
    }

    /** Get the second body attached to this joint. */
    public Body getBodyB() {
        return world.bodies.get(joint.getBodyB());
    }

    /** Get the anchor point on bodyA in world coordinates. */
    final Vec2 tmp = new Vec2();
    private final Vector2 anchorA = new Vector2();

    public Vector2 getAnchorA() {
        joint.getAnchorA(tmp);
        return anchorA.set(tmp.x, tmp.y);
    }

    /** Get the anchor point on bodyB in world coordinates. */
    private final Vector2 anchorB = new Vector2();

    public Vector2 getAnchorB() {
        joint.getAnchorB(tmp);
        return anchorB.set(tmp.x, tmp.y);
    }

    public boolean getCollideConnected() {
        return joint.getCollideConnected();
    }

    /** Get the reaction force on body2 at the joint anchor in Newtons. */
    private final Vector2 reactionForce = new Vector2();

    public Vector2 getReactionForce(float inv_dt) {
        joint.getReactionForce(inv_dt, tmp);
        return reactionForce.set(tmp.x, tmp.y);
    }

    /** Get the reaction torque on body2 in N*m. */
    public float getReactionTorque(float inv_dt) {
        return joint.getReactionTorque(inv_dt);
    }

    /** Get the user data */
    public Object getUserData() {
        return userData;
    }

    /** Set the user data */
    public void setUserData(Object userData) {
        this.userData = userData;
    }

    /** Short-cut function to determine if either body is inactive. */
    public boolean isActive() {
        return joint.isActive();
    }

    public org.jbox2d.dynamics.joints.Joint getJBox2DJoint() {
        return joint;
    }

}