From bf4e13dadb31fbb41fc733b8e465f7c3e405e509 Mon Sep 17 00:00:00 2001
From: Walter Bender <walter@sugarlabs.org>
Date: Mon, 04 Nov 2013 21:36:55 +0000
Subject: alan's patch to left, back

---
(limited to 'TurtleArt')

diff --git a/TurtleArt/tabasics.py b/TurtleArt/tabasics.py
index ce84a49..1dcaa56 100644
--- a/TurtleArt/tabasics.py
+++ b/TurtleArt/tabasics.py
@@ -179,9 +179,8 @@ class Palettes():
                           help_string=_('moves turtle backward'))
         self.tw.lc.def_prim(
             'back', 1,
-            Primitive(Turtle.forward,
-                      arg_descs=[ArgSlot(TYPE_NUMBER,
-                                         wrapper=self.prim_cache["minus"])],
+            Primitive(Turtle.backward,
+                      arg_descs=[ArgSlot(TYPE_NUMBER)],
                       call_afterwards=self.after_move))
 
         palette.add_block('clean',
@@ -214,9 +213,8 @@ turtle'))
 in degrees)'))
         self.tw.lc.def_prim(
             'left', 1,
-            Primitive(Turtle.right,
-                      arg_descs=[ArgSlot(TYPE_NUMBER,
-                                         wrapper=self.prim_cache["minus"])],
+            Primitive(Turtle.left,
+                      arg_descs=[ArgSlot(TYPE_NUMBER)],
                       call_afterwards=self.after_right))
 
         palette.add_block('right',
diff --git a/TurtleArt/taturtle.py b/TurtleArt/taturtle.py
index 88f4782..a404943 100644
--- a/TurtleArt/taturtle.py
+++ b/TurtleArt/taturtle.py
@@ -561,6 +561,15 @@ class Turtle:
                                               round_int(self._heading)]))
             self._turtles.turtle_window.send_event(event)
 
+    def left(self, degrees, share=True):
+        try:
+            degrees = 0 - degrees
+        except:
+            debug_output('bad value sent to %s' % (__name__),
+                         self._turtles.turtle_window.running_sugar)
+            return
+        self.right(degrees, share)
+
     def _draw_line(self, old, new, pendown):
         if self._pen_state and pendown:
             self._turtles.turtle_window.canvas.set_source_rgb()
@@ -593,6 +602,15 @@ class Turtle:
                                               int(distance)]))
             self._turtles.turtle_window.send_event(event)
 
+    def backward(self, distance, share=True):
+        try:
+            distance = 0 - distance
+        except:
+            debug_output('bad value sent to %s' % (__name__),
+                         self._turtles.turtle_window.running_sugar)
+            return
+        self.forward(distance, share)
+
     def set_xy(self, x, y, share=True, pendown=True, dragging=False):
         old = self.get_xy()
         try:
--
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