Algodoo

Based on my other scene, "Bezier-Curve Drawer", I created an enhanced version containing 3 bezier curve segments and a moving circle, so that MoBuilds may use it for his path movement.Each segment is defined by 4 points. The circle wanders along the curve, drawing its way during the process.

If you want the segments to go over in each other without any corners, take the node point(yellow), and place the 2 connected circles(red) in a way so that they are EXACTLY opposite each other. To create a circular path, place the first and last yellow point at the same place and treat them as if they were 1 point