Don't force 3D viewer to be square

(and fix viewport scaling for non square viewers)

printrun/gl/panel.py

@@ -185,7 +185,7 @@ class wxGLPanel(wx.Panel):
         glLoadIdentity()
         self.setup_lights()
         if self.orthographic:
-            ratio = factor * float(min(self.width, self.height)) / self.dist
+            ratio = factor * float(max(self.width, self.height)) / self.dist
             self.zoom_factor = 1.0
             glScalef(ratio, ratio, 1)
 

printrun/gui/viz.py

@@ -85,4 +85,4 @@ class VizPane(wx.BoxSizer):
                                            bgcolor = root.settings.bgcolor)
         root.gwindow.Bind(wx.EVT_CLOSE, lambda x: root.gwindow.Hide())
         if not isinstance(root.gviz, NoViz):
-            self.Add(root.gviz.widget, 1, flag = wx.SHAPED | wx.ALIGN_CENTER_HORIZONTAL)
+            self.Add(root.gviz.widget, 1, flag = wx.EXPAND | wx.ALIGN_CENTER_HORIZONTAL)