[vtkusers] vtkGL2PSExporter in combination with QVTKRenderWindowInteractor

[David Lonie]

Running the test script works for me -- see attachment, the VTK window is
on the right, and the svg rendered in chrome on the left.

Some other issues that might be coming into play:

1) What Qt version are you using, and
2) Which OpenGL backend is being used on VTK? (Did you explicitly select
the experimental OpenGL2 backend while building VTK?)

Dave


On Mon, Jun 29, 2015 at 8:54 AM, Stefan Lau <github at stefanlau.com> wrote:

> 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_())
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