/* Fill the white area of the suggested image with red color. */
   area_color = (24)'1'b;
   call fill (125, 25, '000000000000000011111111'b );

   /* Fill the center orb of the suggested image with green color. */
   area_color = '0'b;
   call fill (125, 125, '000000001111111100000000'b );