From 1d98109a6248d48c166122d79e112f35a4f4b8c1 Mon Sep 17 00:00:00 2001
From: Walter Bender <walter.bender@gmail.com>
Date: Tue, 08 Nov 2011 13:10:05 +0000
Subject: using new grid overlay mechanism for speed up with Cairo graphics

---
(limited to 'turtleart.py')

diff --git a/turtleart.py b/turtleart.py
index 9afc238..9669e21 100755
--- a/turtleart.py
+++ b/turtleart.py
@@ -476,28 +476,11 @@ class TurtleMain():
 
     def _do_cartesian_cb(self, button):
         ''' Callback to display/hide Cartesian coordinate overlay. '''
-        if self.tw.cartesian is True:
-            if self.tw.coord_scale == 1:
-                self.tw.overlay_shapes['Cartesian_labeled'].hide()
-            else:
-                self.tw.overlay_shapes['Cartesian'].hide()
-            self.tw.cartesian = False
-        else:
-            if self.tw.coord_scale == 1:
-                self.tw.overlay_shapes['Cartesian_labeled'].set_layer(
-                                                              OVERLAY_LAYER)
-            else:
-                self.tw.overlay_shapes['Cartesian'].set_layer(OVERLAY_LAYER)
-            self.tw.cartesian = True
+        self.tw.set_cartesian(True)
 
     def _do_polar_cb(self, button):
         ''' Callback to display/hide Polar coordinate overlay. '''
-        if self.tw.polar is True:
-            self.tw.overlay_shapes['polar'].hide()
-            self.tw.polar = False
-        else:
-            self.tw.overlay_shapes['polar'].set_layer(OVERLAY_LAYER)
-            self.tw.polar = True
+        self.tw.set_polar(True)
 
     def _do_rescale_cb(self, button):
         ''' Callback to rescale coordinate space. '''
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