cq_toplevel: remove dead code from export_png_image

cq_toplevel.py

@@ -21,7 +21,7 @@ import pinephone
 import ldtek_battery
 
 from cadquery.occ_impl.assembly import toVTK
-from cadquery.vis import _to_assy, _vtkRenderWindow
+from cadquery.vis import _to_assy
 from vtkmodules.vtkRenderingCore import vtkRenderWindow, vtkWindowToImageFilter
 from vtkmodules.vtkIOImage import vtkPNGWriter
 
@@ -29,14 +29,9 @@ from vtkmodules.vtkIOImage import vtkPNGWriter
 logger = logging.getLogger(__name__)
 
 def export_png_image(obj, file_: str):
-    # obj = obj.val().scale(2)
-    # obj = obj.transformed(offset=(0, 0, 0))
     assy = _to_assy(obj)
-    # win = _vtkRenderWindow(assy)
     renderer = toVTK(assy)
     win = vtkRenderWindow()
-    # win.SetMultiSamples(16)
-    # win.SetSize(1024, 1024)
     win.AddRenderer(renderer)
     win.Render()
     camera = renderer.GetActiveCamera()
@@ -49,15 +44,11 @@ def export_png_image(obj, file_: str):
     renderer.ResetCamera()
     renderer.SetBackground(0.8, 0.8, 0.8)
 
-    # win.SetPosition(-10, 0)
-
     win.Render()
 
     # documented here: <https://examples.vtk.org/site/Python/IO/ImageWriter/>
     win_to_input = vtkWindowToImageFilter()
     win_to_input.SetInput(win)
-    # win_to_input.SetScale(5)
-    # win_to_input.SetViewport(0, 0, 5, 5)
     win_to_input.SetInputBufferTypeToRGB()
     win_to_input.ReadFrontBufferOff()
     win_to_input.Update()