PR: Add a tool to select the water level data with the mouse #255
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Handle when a rectangular area to select water level data has been selected.
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Added a tool to select the water level data by clicking with the mouse and dragging the cursor over a rectangular region of the graph.
I decided not to go with the matplotlib RectangularSelector widget because it was not working well when using
blitting. The reason is that it was competing with the other features that are implemented inWLCalcthat also useblitting(like the data an wl labels that are displayed in the bottom-right corner of the graph). So it was more efficient to code my own custom selector.I also did some code cleaning and refactoring, so that it is easier to add more navigation and selection tools in the future.