From c7fa5dca9957c90d122b4d28e1cc0e9b1472c761 Mon Sep 17 00:00:00 2001
From: Walter Bender <walter@sugarlabs.org>
Date: Tue, 25 Jun 2013 19:29:51 +0000
Subject: turtle-centric

---
diff --git a/pysamples/forward_push.py b/pysamples/forward_push.py
index b98c726..ca527db 100644
--- a/pysamples/forward_push.py
+++ b/pysamples/forward_push.py
@@ -1,10 +1,13 @@
-#Copyright (c) 2012, Walter Bender
+#Copyright (c) 2012-2013, Walter Bender
 
 # Usage: Import this code into a Python (user-definable) block; when
-# this code is run, the turtle will draw a line of the length of the
-# numeric argument block docked to the Python block. But before
-# drawing the line, it pushes the rgb values of the destination to the
-# FILO.
+# this code is run, a new block will be added to the Turtle Palette.
+# This block will be named 'name', the value of the argument block
+# docked to the Python block.
+#
+# The new block will cause the turtle to draw a line of the
+# length. But before drawing the line, it pushes the rgb values of the
+# destination to the FILO.
 
 
 def myblock(tw, name):
@@ -15,16 +18,16 @@ def myblock(tw, name):
             line_length = float(line_length)
         except ValueError:
             return
-        penstatus = tw.canvas.pendown
-        tw.canvas.setpen(False)
-        tw.canvas.forward(line_length)
-        r, g, b, a = tw.canvas.get_pixel()
+        penstatus = tw.turtles.get_active_turtle().get_pen_status()
+        tw.turtles.get_active_turtle().set_pen_state(False)
+        tw.turtles.get_active_turtle().forward(line_length)
+        r, g, b, a = tw.turtles.get_active_turtle().get_pixel()
         tw.lc.heap.append(b)
         tw.lc.heap.append(g)
         tw.lc.heap.append(r)
-        tw.canvas.forward(-line_length)
-        tw.canvas.setpen(penstatus)
-        tw.canvas.forward(line_length)
+        tw.turtles.get_active_turtle().forward(-line_length)
+        tw.turtles.get_active_turtle().set_pen_state(penstatus)
+        tw.turtles.get_active_turtle().forward(line_length)
         return
 
     from TurtleArt.tapalette import make_palette, palette_name_to_index
diff --git a/pysamples/uturn.py b/pysamples/uturn.py
index cdeb96d..fee9a29 100644
--- a/pysamples/uturn.py
+++ b/pysamples/uturn.py
@@ -1,4 +1,4 @@
-#Copyright (c) 2011, Walter Bender
+#Copyright (c) 2011-2013, Walter Bender
 
 # This procedure is invoked when the user-definable block on the
 # "extras" palette is selected.
@@ -11,6 +11,17 @@
 def myblock(tw, arg):
     ''' Add a uturn block to the 'turtle' palette '''
 
+    # def_prim takes 3 arguments: the primitive name, the number of
+    # arguments -- 0 in this case -- and the function to call -- in this
+    # case, we define the _prim_uturn function to set heading += 180.
+    def _prim_uturn(tw):
+        value = tw.turtles.get_active_turtle().get_heading() + 180
+        tw.turtles.get_active_turtle().set_heading(value)
+        # We also update the label on the heading block to indicate
+        # the current heading value
+        if tw.lc.update_values:
+            tw.lc.update_label_value('heading', value)
+
     from TurtleArt.tapalette import make_palette, palette_name_to_index
     from TurtleArt.talogo import primitive_dictionary
     from gettext import gettext as _
@@ -26,10 +37,14 @@ def myblock(tw, arg):
                       help_string=_('make a uturn'))
 
     # Add its primitive to the LogoCode dictionary.
-    tw.lc.def_prim('uturn', 0,
-                   lambda self: primitive_dictionary['set']
-                   ('heading', tw.canvas.seth, tw.canvas.heading + 180))
+    tw.lc.def_prim('uturn', 0, lambda self: _prim_uturn(tw))
 
     # Regenerate the palette, which will now include the new block.
     tw.show_toolbar_palette(palette_name_to_index('turtle'),
                             regenerate=True)
+
+    palette.add_block('uturn',  # the name of your block
+                      style='basic-style',  # the block style
+                      label=_('u turn'),  # the label for the block
+                      prim_name='uturn',  # code reference (see below)
+                      help_string=_('turns the turtle 180 degrees'))
--
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