[vtkusers] Mac/Cocoa/Qt "invalid drawable"

[Chris Kees]

Hi,

I've installed vtk from cvs on a Mac with OS X 10.5.6 using the 64 bit  
Qt 4.5 libraries and the patched VTK source. The code runs fine except  
I get a warning:

2009-05-05 12:17:16.313 python[75352:807] invalid drawable

when calling Initialize on the QVTKRenderWindowInteractor.  If I just  
remove the Initialize call then the code runs fine without warnings. I  
saw a post from 2005 that mentioned the warning and a work around that  
I don't quite understand.  Anybody know if this is still  something  
that needs a work around, or am I just doing something wrong?

Chris

Here's an example that generates the warning (needs PyQt installed as  
well):

#!/usr/bin/env python
from vtk import *
from vtk.qt4.QVTKRenderWindowInteractor import *
import sys
from PyQt4 import QtGui
import copy

app = QtGui.QApplication(sys.argv)

import numpy
from math import cos,sin

nPoints=10
x = numpy.zeros((3,),'d')
d=2.0
pointData=vtkPoints()
pointData.SetNumberOfPoints(2*nPoints)
for ix in range(2):
     for iTheta in range(nPoints):
	x[0] = ix*d
	x[1] = cos(float(iTheta)*(2.0*3.14)/float(nPoints))
	x[2] = sin(float(iTheta)*(2.0*3.14)/float(nPoints))
	pointData.SetPoint(ix*nPoints+iTheta,x)
polygons=vtkCellArray()
scalars=vtkDoubleArray()

for ix in range(2):
     polygons.InsertNextCell(nPoints)
     scalars.InsertNextValue(float(ix))
     for iTheta in range(nPoints):
         polygons.InsertCellPoint(ix*nPoints+iTheta)

ix=0
for iTheta in range(nPoints):
     polygons.InsertNextCell(4)
     scalars.InsertNextValue(0.5)
     polygons.InsertCellPoint(ix*nPoints+iTheta)
     polygons.InsertCellPoint(ix*nPoints+(iTheta+1)%nPoints)
     polygons.InsertCellPoint((ix+1)*nPoints+(iTheta+1)%nPoints)
     polygons.InsertCellPoint((ix+1)*nPoints+iTheta)

cylinder = vtkPolyData()
cylinder.SetPoints(pointData)
cylinder.SetPolys(polygons)
cylinder.GetCellData().SetScalars(scalars)

#
#visualize
#
tabs = True#False
mainWindow = QtGui.QMainWindow()

if tabs:
     tabWidget = QtGui.QTabWidget(mainWindow)
     mainWindow.setCentralWidget(tabWidget)
     frameWidget = QtGui.QFrame(mainWindow)
     hbox = QtGui.QHBoxLayout()
     frameWidget2 = QtGui.QFrame(mainWindow)
     hbox2 = QtGui.QHBoxLayout()
     iren = QVTKRenderWindowInteractor(frameWidget)
     iren2 = QVTKRenderWindowInteractor(frameWidget2)
else:
     frameWidget = QtGui.QFrame(mainWindow)
     hbox = QtGui.QHBoxLayout()
     mainWindow.setCentralWidget(frameWidget)
     iren = QVTKRenderWindowInteractor(frameWidget)
     iren2 = QVTKRenderWindowInteractor(frameWidget)

iren.Initialize()
iren2.Initialize()

cylinderMapper = vtkPolyDataMapper()
cylinderMapper.SetInput(cylinder)
cylinderMapper.SetScalarRange(0,1)

cylinderActor = vtkActor()
cylinderActor.SetMapper(cylinderMapper)

renderer = vtkRenderer()
renderer.AddActor(cylinderActor)

renderer2 = vtkRenderer()
renderer2.AddActor(cylinderActor)

renWin = iren.GetRenderWindow()
renWin.AddRenderer(renderer)

renWin2 = iren2.GetRenderWindow()
renWin2.AddRenderer(renderer2)

if tabs:
     hbox.addWidget(iren)
     frameWidget.setLayout(hbox)
     hbox2.addWidget(iren2)
     frameWidget2.setLayout(hbox2)
     tabWidget.addTab(frameWidget,"Cylinder 1")
     tabWidget.addTab(frameWidget2,"Cylinder 2")
else:
     hbox.addWidget(iren)
     hbox.addWidget(iren2)
     frameWidget.setLayout(hbox)

mainWindow.show()

#iren.show()
#iren2.show()
#app.exec_()
#iren.show()
#iren2.show()
#app.exec_()
sys.exit(app.exec_())