Plug several VCS memory leaks.

Author: David C. Lonie

Packages/vcs/Lib/Canvas.py

@@ -4029,8 +4029,8 @@ def close(self, *args, **kargs):
 """
         if self.configurator:
             self.endconfigure()
-        # Close the VCS Canvas
         a = self.backend.close(*args, **kargs)
+        self.animate_info = []
 
         return a
 

Packages/vcs/Lib/VTKAnimate.py

@@ -158,8 +158,6 @@ def __init__(self, vcs_self):
         self.renderers = []
         self.last_size = None
         self.modified_listener = None
-        import atexit
-        atexit.register(self.close)
 
     def modified(self, obj, event):
         # Use this to sync canvas sizes and to prevent configureEvent from

Packages/vcs/Lib/animate_helper.py

@@ -764,6 +764,7 @@ class AnimationController(animate_obj_old):
     def __init__(self, vcs_self):
         animate_obj_old.__init__(self, vcs_self)
         self.create_thread = None
+        self.create_canvas = None
         self.playback_thread = None
 
         self.animation_created = False
@@ -779,6 +780,13 @@ def __init__(self, vcs_self):
         self.AnimationPlayback = AnimationPlayback
         self._number_of_frames = None
 
+    def close(self, preserve_pngs = False):
+        if self.create_canvas:
+            self.create_canvas.close()
+            self.create_canvas = None
+        self.animate_info = []
+        return super(AnimationController, self).close(preserve_pngs)
+
     def set_signals(self, signals):
         self.signals = signals