Hello. I would like to know how I could re-use the existing rectangle
selection tool codes for my tool:

My simple rectangle selection tool would maintain one rectangle (four
vertexes joined with edges). User may adjust the selected rectangle
by grabbing and dragging the vertexes or the edges. The selection
mask is created each time at the release-button event (until the
tool is changed to other).

  for developers of open source graphics software
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