protected override void CopyTo(JointInfo target)
        {
            base.CopyTo(target);
            FixedDistanceJointInfo c = target as FixedDistanceJointInfo;

            c.worldAnchor  = this.worldAnchor;
            c.localAnchor  = this.localAnchor;
            c.dampingRatio = this.dampingRatio;
            c.frequency    = this.frequency;
            c.length       = this.length;
        }
 private void DrawJoint(Canvas canvas, FixedDistanceJointInfo joint)
 {
     this.DrawWorldDistConstraint(canvas, joint.BodyA, joint.LocalAnchor, joint.WorldAnchor, joint.TargetDistance, joint.TargetDistance);
     this.DrawWorldAnchor(canvas, joint.BodyA, joint.WorldAnchor);
     this.DrawLocalAnchor(canvas, joint.BodyA, joint.LocalAnchor);
 }