Fix position saving and rendering issues

1) translate_to_origin was using symbol coordinates instead of scene
coordinates so there could still be negative coordinates
2) render_everything was badly testing the input ast coordinates

opengeode/Pr.py

@@ -39,7 +39,6 @@ class Indent(deque):
 def parse_scene(scene, full_model=False):
     ''' Return the PR string for a complete scene
         Optionally, also generate the SYSTEM structure, with channels, etc. '''
-    #pr_data = deque()
     pr_data = Indent()
     if full_model:
         # Generate a complete SDL system - to have everything in a single file

opengeode/opengeode.py

@@ -550,7 +550,8 @@ class SDL_Scene(QtGui.QGraphicsScene, object):
                 # slightly altered by the reshaping functions)
                 def fix_pos_from_ast(symbol):
                     try:
-                        if symbol.ast.pos_x and symbol.ast.pos_y:
+                        if(symbol.ast.pos_x is not None
+                                and symbol.ast.pos_y is not None):
                             relpos = symbol.mapFromScene(symbol.ast.pos_x,
                                                          symbol.ast.pos_y)
                             #symbol.pos_x += relpos.x()
@@ -694,8 +695,8 @@ class SDL_Scene(QtGui.QGraphicsScene, object):
             in order to avoid negative coordinates
         '''
         try:
-            min_x = min(item.x() for item in self.visible_symb)
-            min_y = min(item.y() for item in self.visible_symb)
+            min_x = min(item.scenePos().x() for item in self.visible_symb)
+            min_y = min(item.scenePos().y() for item in self.visible_symb)
         except ValueError:
             # No item in the scene
             return 0, 0