d3.js: constraining drag do circular path : response to http://jsfiddle.net/EBMSr/17/
Constraining drag/mousemove to circular path …… ? 8
Answering the question if D3 can move circles around a circular path, which included the starting point / example (http://jsfiddle.net/EBMSr/17/)
Stated a different way, this asks whether D3 can constrain a drag/move to a circular path.