A Demo of d3lb.bbox Behaviour

Use cursors
Allow movement in X
Allow movement in Y
West
North/West
North
North/East
East
South/East
South
South/West
Restrict horizontal extent
Restrict vertical extent

Radius

dragstart events: 0
dragmove events: 0 (Total distance: 0px)
dragend events: 0
resizestart events: 0
resizemove events: 0
resizeend events: 0