[vtkusers] VTK and PyQt

[Jacky Ko]

This a  reply for  the  thread  VTK and PyQt

http://public.kitware.com/pipermail/vtkusers/2015-November/092811.html

Unlike  C++ ,  PyQt  has a  special  way  for  VTK  embedding

Please  follow  the  instruction  to  create a  custom  defined  Qt widget:
1.  Create a  widget  object in  Qt  Designer
2.  In  the  top  right  Object  Inspector  panel,  right click   and
 select  "Promote to..."
3.  a. Base class  name: QWidget,  b.  Promoted class name:  vtkWidget,
 c.  Header  file:  vtkWidget,  click  "add"
In  this  step,  the  promoted  class name and  header  file  need not to
be the same,  but  for  convention  I  usually  set them  to be  in same
name.
4.  Save the  UI design  in the  folder  where  your  project is  in,  I
use  main.ui  for  example
5.  In the  python  project,  create  the  vtkWidget.py header file  with
following  code:

import vtk
from PyQt4 import QtGui
from vtk.qt4.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
from PyQt4.QtGui import QLabel

class vtkWidget(QtGui.QWidget):

    def __init__(self, parent = None):
        QtGui.QWidget.__init__(self, parent)
        self.vbl = QtGui.QVBoxLayout()

        self.vtkWidget = QVTKRenderWindowInteractor(self)
        self.vbl.addWidget(self.vtkWidget)

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

        self.vtkWidget.show()
        self.iren.Initialize()
        self.setLayout(self.vbl)

6.  In the  python  project,  create  a  main.py  file  with following
 code:

from PyQt4 import QtCore, QtGui, uic
import vtk
import sys

form_class = uic.loadUiType("main.ui")[0]
class Ui_MainWindow(QtGui.QMainWindow, form_class):
    def __init__(self, parent=None):
        QtGui.QMainWindow.__init__(self, parent)
        self.setupUi(self)

      # setting renderer of 3D widget, object  name  of  the  vtkWidget  in
 .ui  file is  called  widget3D
        self.ren3D = vtk.vtkRenderer()
        self.widget3D.vtkWidget.GetRenderWindow().AddRenderer(self.ren3D)

        # render window interactor property
        self.iren =
self.widget3D.vtkWidget.GetRenderWindow().GetInteractor()

self.iren.SetInteractorStyle(vtk.vtkInteractorStyleTrackballCamera())

    def Exit(self):
        sys.exit(app.exec_())

app = QtGui.QApplication(sys.argv)
Ui_MainWindow = Ui_MainWindow(None)
Ui_MainWindow.show()
app.exec_()

7.  Follow  vtk  pipeline  to  create  an  vtkActor  class ,  you  can
throw  the  actor  into the  vtkWidget  by  self.ren3D.AddActor()  function.

Execute  main.py  and  see  if  the  widget  worked fine.  With  the  uic
 load  function,  the  UI  can  dynamically  design  with Qt  Designer
 instead of  pre-compilation.  Remember to save  .ui  file  everytime after
 modification .
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