"""Returns a colour value at a specific x, y coordinate pair. This
         is useful for determining the colour found a specific mouse click
         in an external event handler."""
-        return self.buffer.GetPixel((x, y))
+        return self.buffer.GetPixel(x, y)
 
     def DrawBuffer(self):
         """Draws the palette XPM into the memory buffer."""
         #self.GeneratePaletteBMP ("foo.bmp")
-        self.buffer.DrawBitmap(self.palette, (0, 0), 0)
+        self.buffer.DrawBitmap(self.palette, 0, 0, 0)
 
     def HighlightPoint(self, x, y):
         """Highlights an area of the palette with a little circle around
         colour = wx.Colour(0, 0, 0)
         self.buffer.SetPen(wx.Pen(colour, 1, wx.SOLID))
         self.buffer.SetBrush(wx.Brush(colour, wx.TRANSPARENT))
-        self.buffer.DrawCircle((x, y), 3)
+        self.buffer.DrawCircle(x, y, 3)
         self.Refresh()
 
     def GeneratePaletteBMP(self, file_name, granularity=1):
                 colour = wx.Colour(int(r * 255.0), int(g * 255.0), int(b * 255.0))
                 self.buffer.SetPen(wx.Pen(colour, 1, wx.SOLID))
                 self.buffer.SetBrush(wx.Brush(colour, wx.SOLID))
-                self.buffer.DrawRectangle((x, y),
-                                          (self.HORIZONTAL_STEP, self.vertical_step))
+                self.buffer.DrawRectangle(x, y,
+                                          self.HORIZONTAL_STEP, self.vertical_step)
 
         # this code is now simpler (and works)
         bitmap = self.buffer.GetBitmap()