I am reposting my problem since I have not been able to solve it myself. I guess my original question has been buried deeply in this list.
I modified the path_editor.py example in order to make a line editor, as attached. The path_editor.py worked fine on Qt4Agg. However, in the line editor, the line was not draggable on the same backend. The printout showed that the line (nodal coordinates) had been updated but it was not redrawn in the axes. I also tested the line editor on WXAgg and TkAgg and it did not work either. I am using Windows 7. John Hunter tested this line editor on his system and found it was working properly. I wonder whether this is a issue of backend/os. I would like invite people to simply run this script and report your successfulness and your backend/os. It will be especially useful for me if you are using Qt4Agg on Windows 7. Thank you very much. -- Jinsuo
line_editor.py
Description: line_editor.py
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