Drawing a line

    I want to connect a line between two points.  When the user click on
    one point and start to move the cursor, there will be a line from
    where the user clicked first to the cursor.  And there should be a
    static line from that point to the position where the user click 
    later.  It can be saw on many graphics software.

    With Gtkmm, how do I do it?  Thanks for your help.


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