Rope.java

public class Rope {

    private World world;
    private DistanceJoint rope;
    private boolean ropeExists = false;

    public Rope(World world){
        this.world = world;
    }

    public void createRope(Body player, Body cloud){
        destroyRope();

        DistanceJointDef dDef = new DistanceJointDef();

        dDef.initialize(player, cloud, player.getPosition(), cloud.getPosition());

        if(!world.isLocked()) {
            rope = (DistanceJoint) this.world.createJoint(dDef);
        }

        ropeExists = true;
    }


    public void destroyRope(){
        if(ropeExists && !world.isLocked()) {
            this.world.destroyJoint(rope);
            rope = null;
            ropeExists = false;
        }
    }
}