Callback that fires while dragging a point. The mouse event is passed in
as parameter. The original data can be accessed from e.origin
, and the
new point values can be accessed from e.newPoints
. If there is only a
single point being updated, it can be accessed from e.newPoint
for
simplicity, and its ID can be accessed from e.newPointId
. The this
context is the point being dragged. To stop the default drag action,
return false. See drag and drop options.