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

            c.localAnchor = this.localAnchor;
            c.maxForce    = this.maxForce;
            c.maxTorque   = this.maxTorque;
        }
 private void DrawJoint(Canvas canvas, FixedFrictionJointInfo joint)
 {
     this.DrawLocalFrictionMarker(canvas, joint.BodyA, joint.LocalAnchor);
 }