File: //opt/alt/python27/lib64/python2.7/site-packages/mpl_toolkits/axisartist/axisline_style.pyc
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        The artist class that will be returend for SimpleArrow style.
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            Extend the path to make a room for drawing arrow.
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            Draw the axis line.
             1) transform the path to the display cooridnate.
             2) extend the path to make a room for arrow
             3) update the path of the FancyArrowPatch.
             4) draw
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