[vtkusers] vtkGL2PSExporter in combination with QVTKRenderWindowInteractor

[Stefan Lau]

Hi,

I'm trying to export an image from my application created in PyQt4 to a
vector image. While the vtkGL2PSExporter works fine from outside my QT
application, when trying to export the image from inside it the output 
looks corrupted. A minimal example can be found at the end of this 
email. Did I miss something (or call something incorrectly)? Is this a 
known issue?

Version: VTK 6.1.0

Thanks for any help,
Stefan Lau


Minimal Example:
#!/usr/bin/env python

import sys
import os
import vtk
from PyQt4 import QtCore, QtGui
from vtk.qt4.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor

class MainWindow(QtGui.QMainWindow):

     def __init__(self, parent = None):
         QtGui.QMainWindow.__init__(self, parent)

         self.frame = QtGui.QFrame()

         self.vl = QtGui.QVBoxLayout()
         self.vtkWidget = QVTKRenderWindowInteractor(self.frame)
         self.vl.addWidget(self.vtkWidget)

         self.ren = vtk.vtkRenderer()
         self.vtkWidget.GetRenderWindow().AddRenderer(self.ren)
         self.iren = self.vtkWidget.GetRenderWindow().GetInteractor()

         # Create source
         source = vtk.vtkSphereSource()
         source.SetCenter(0, 0, 0)
         source.SetRadius(5.0)

         # Create a mapper
         mapper = vtk.vtkPolyDataMapper()
         mapper.SetInputConnection(source.GetOutputPort())

         # Create an actor
         actor = vtk.vtkActor()
         actor.SetMapper(mapper)

         button = QtGui.QPushButton(self.frame)
         button.setGeometry(20, 20, 32, 32)
         button.setIcon(QtGui.QIcon.fromTheme('document-save'))
         button.setToolTip('Save Visualization')

         button.clicked.connect(self.store_visualization)

         self.ren.AddActor(actor)

         self.ren.ResetCamera()

         self.frame.setLayout(self.vl)
         self.setCentralWidget(self.frame)

         self.show()
         self.iren.Initialize()

     def store_visualization(self, render_window):
         file_name = str(QtGui.QFileDialog.getSaveFileName(
             self,
             'Save Visualization',
             os.path.join(os.getcwd(), '/visualization.svg'),
             'SVG-Images (*.svg)'
         ))

         if len(file_name) > 0:
             exporter = vtk.vtkGL2PSExporter()
exporter.SetRenderWindow(self.vtkWidget.GetRenderWindow())
             exporter.SetFileFormatToSVG()
             exporter.CompressOff()
             exporter.DrawBackgroundOff()
             exporter.SetFilePrefix(os.path.splitext(file_name)[0])
             exporter.Write()


if __name__ == "__main__":
     app = QtGui.QApplication(sys.argv)
     window = MainWindow()
     sys.exit(app.exec_())