add some copywrite info

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@14745 c8812cc2-4d05-0410-92ff-de0c093fc19c

Author: cfarmer

python/plugins/fTools/tools/doGeometry.py

@@ -550,6 +550,9 @@ def voronoi_polygons( self ):
 
 
   def clip_voronoi(self, edges, c, width, height, extent, exX, exY):
+    """ Clip voronoi function based on code written for Inkscape
+        Copyright (C) 2010 Alvin Penner, penner@vaxxine.com
+    """
     def clip_line(x1, y1, x2, y2, w, h, x, y):
       if x1 < 0-x and x2 < 0-x:
         return [0, 0, 0, 0]

python/plugins/fTools/tools/voronoi.py

@@ -4,6 +4,8 @@
 # Translated to Python by Bill Simons
 # September, 2005
 #
+# Additional changes by Carson Farmer added November 2010
+#
 # Calculate Delaunay triangulation or the Voronoi polygons for a set of 
 # 2D input points.
 #