+ # export to an image
+ def export_image (self, filename, solution=False):
+ # don't export if grid is not frozen
+ if self.frozen_grid is False:
+ raise FrozenGridException
+
+ # create cairo image surface and context
+ px = 30
+ surf = cairo.ImageSurface (cairo.FORMAT_RGB24, self.cols*px, self.rows*px)
+ ctx = cairo.Context (surf)
+
+ ctx.set_source_rgb (1, 1, 1)
+ ctx.rectangle (0, 0, self.cols*px, self.rows*px)
+ ctx.fill ()
+
+ # traverse through the grid
+ for row in range (self.rows):
+ for col in range (self.cols):
+ # if grid is un-occupied
+ if (self.data[row][col].occupied_across is False and
+ self.data[row][col].occupied_down is False):
+ ctx.set_source_rgb (0, 0, 0)
+ ctx.rectangle (col*px, row*px, px, px)
+ ctx.fill ()
+ # grid is occupied
+ else:
+ ctx.set_source_rgb (1, 1, 1)
+ ctx.rectangle (col*px, row*px, px, px)
+ ctx.fill ()
+ ctx.set_source_rgb (0, 0, 0)
+ ctx.rectangle (col*px, row*px, px, px)
+ ctx.stroke ()
+ # if solution is not to be provided, number the grid
+ if solution is False:
+ if self.data[row][col].numbered <> 0:
+ ctx.select_font_face ("Serif")
+ ctx.set_font_size (10)
+ ctx.move_to (col*px+5, row*px+10)
+ ctx.show_text (str(self.data[row][col].numbered))
+ # display the words
+ else:
+ ctx.select_font_face ("Serif")
+ ctx.set_font_size (16)
+ ctx.move_to (col*px+10, row*px+20)
+ ctx.show_text (self.data[row][col].char)
+
+ surf.write_to_png (open (filename, "wb"))
+