[Pythoncard-cvs] PythonCard turtle.py,1.18,1.19

[Kevin A. <ka...@us...>]

Update of /cvsroot/pythoncard/PythonCard
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv21191

Modified Files:
	turtle.py 
Log Message:
added push and pop


Index: turtle.py
===================================================================
RCS file: /cvsroot/pythoncard/PythonCard/turtle.py,v
retrieving revision 1.18
retrieving revision 1.19
diff -C2 -d -r1.18 -r1.19
*** turtle.py	9 May 2004 19:46:05 -0000	1.18
--- turtle.py	11 May 2004 13:03:56 -0000	1.19
***************
*** 315,318 ****
--- 315,320 ----
          self._savePosition = self._position
          self._saveAngle = self._angle
+         # used for LIFO stack of turtle state
+         self._turtleStack = []
          self._odometer = 0.0
          # don't waste time tracking unless requested
***************
*** 360,371 ****
--- 362,391 ----
          self._position = (float(x1), float(y1))
  
+     # could save more than position and heading below
+     # perhaps the turtle color, whether it is shown or not?
+     
      def saveState(self):
+         """save the current turtle position and heading"""
          self._savePosition = self._position
          self._saveAngle = self._angle
  
      def restoreState(self):
+         """restore the turtle position and heading to the last saved state"""
          self.moveTo(self._savePosition[0], self._savePosition[1])
          self.setHeading(self._saveAngle)
  
+     def push(self):
+         """push the current turtle position and heading onto a LIFO stack"""
+         self._turtleStack.append((self._position, self._angle))
+ 
+     def pop(self):
+         """set the turtle position and heading to the state popped from a LIFO stack"""
+         try:
+             position, angle = self._turtleStack.pop()
+             self.moveTo(position[0], position[1])
+             self.setHeading(angle)
+         except IndexError:
+             pass
+ 
  
  class BitmapTurtle(AbstractTurtle):