When use vtkResliceCursorWidget, How to use mouse touch more conveniently to the handle ?

I use vtkResliceCursorWidget to display MPR.When I rotate the handle(reslicecursor), I must accurately place the mouse on the handle to succeed. The effect I want to achieve is that when my mouse is near the handle, I can sense and control the rotation of the handle,What should I do?


Have a look at ResliceCursorContextRepresentation.updateActorVisibility(), it temporarilly increase the size of the line and the handles for picking purpose.

Thanks for your reply and help! Later, I added mouse position judgment in the move mouse event. When it is close to the handle, I will enlarge the handle, and the effect is OK.