Hatch patterns are commonly used in graphics software to highlight distinct areas of a map or drawing.  There are three general techniques for filling in polygonal areas on a software canvas:  

   * flood with a single defined colour - currently this method is supported by the Tk canvas.
   * fill with tiled raster image, and 
   * fill with repeated vector pattern

This page is dedicated to the discussion of the repeated vector pattern.

http://www.google.ca/url?sa=t&rct=j&q=acad.pat%20create%20custom%20hatch%20pattern&source=web&cd=1&ved=0CB4QFjAA&url=http%3A%2F%2Fwww.ellenfinkelstein.com%2Facadblog%2Fcreating-custom-hatch-patterns%2F&ei=o03ETuSIEOr20gH57o2gDw&usg=AFQjCNHBPbztSI2mQXY7q_JAy0MQitgq0A&cad=rja%|%Official documentation for hatch pattern definitions%|%


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