How to draw a resizable circle?

Support
1

I need to insert a circle into VTK widget window via mouse interaction. Its radius and position should be resizable by dragging. Inserting a polydata doesn’t seem to provide the option to modify radius and position. Could anyone suggest the right tool to do this - similar to distance widget or angle widget? Or any method to implement this. Any help would be highly appreciated.

Thanks

2

You can use the combination of line widget and circle and connect then via a callback. The point handle of line widget can be used for dragging/resize circle.

3

Thank you for the reply… Those are two separate elements. How do we connect one’s handle to the other

4

You can connect the elements using vtkcallback, refer this example for vtkcallback implementation. You can use the the mouse click and move events for creating and resizing circle.

1 Like
5

That worked. Thank you. Though I used an eventfilter instead of callback… same principle