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[Segmentation] New Add/Remove tool
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After the user feedback (polygon like handling, instead of lasso while clicked), I would propose we implement a base tool (for add and remove) that behaves (mouse interactions and keys) like the lasso tool of GIMP. Only difference I would make, is that i would make it a closed contour from the beginning (anything else does not make sense in our context).

Key features:

  • Normal state is polygon tool (click some where generates the next control point and a straigt line to it)
  • Move while mouse button pressed, free lasso paint as now (when mouse button is release new controll point is generated)
  • If courser is on an existing control point, we switch to control point moving mode (pressing mouse button starts moving the point)
  • Return, Space (or like other tools (tool change, slice change...) finishes segmentation
  • ESC cancles it
  • Backspace, removes everything up to the last control point.