# vtkInteractorStyleImage do not work in QVTKWidget
**URL:** https://discourse.vtk.org/t/vtkinteractorstyleimage-do-not-work-in-qvtkwidget/6358
**Category:** Support
**Created:** [August 11, 2021, 1:52pm UTC](https://discourse.vtk.org/t/vtkinteractorstyleimage-do-not-work-in-qvtkwidget/6358 "2021-08-11T13:52:10Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)
#### Post date: [August 11, 2021, 1:52pm UTC](https://discourse.vtk.org/t/vtkinteractorstyleimage-do-not-work-in-qvtkwidget/6358/1 "2021-08-11T13:52:10Z")
I find `vtkInteractorStyleImage` do not work in `QVTKWidget`.
For example, the following code:
```auto
import vtk
from vtk.util.numpy_support import vtk_to_numpy, numpy_to_vtk
import numpy as np
def numpyToVTK(data):
if len(data.shape) == 2:
data = data[:, :, np.newaxis]
flat_data_array = data.transpose(2,1,0).flatten()
vtk_data = numpy_to_vtk(num_array=flat_data_array, deep=True, array_type=vtk.VTK_FLOAT)
shape = data.shape
img = vtk.vtkImageData()
img.GetPointData().SetScalars(vtk_data)
img.SetDimensions(shape[0], shape[1], shape[2])
return img
img = np.zeros(shape=[512, 512])
img[0:256, 0:256] = 0
img[0:256, 256:] = 64
img[256:, 0:256] = 128
img[256:, 256:] = 256
img = numpyToVTK(img)
imgActor = vtk.vtkImageActor()
imgActor.SetInputData(img)
renderer = vtk.vtkRenderer()
renderer.AddActor(imgActor)
renderer.SetBackground(0.4, 0.5, 0.6)
renderWindow = vtk.vtkRenderWindow()
renderWindow.AddRenderer(renderer)
renderWindow.Render()
renderWindowInteractor = vtk.vtkRenderWindowInteractor()
style = vtk.vtkInteractorStyleImage()
renderWindowInteractor.SetInteractorStyle(style)
renderWindowInteractor.SetRenderWindow(renderWindow)
renderWindowInteractor.Initialize()
renderWindowInteractor.Start()
```
I can’t rotate the image, because the `vtkInteractorStyleImage` is used.
But, if I want to use `vtkInteractorStyleImage` in `QVTKWidget`, for example:
```auto
import vtk
from vtk.util.numpy_support import vtk_to_numpy, numpy_to_vtk
import numpy as np
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
import sys
from vtk.qt.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
def numpyToVTK(data):
if len(data.shape) == 2:
data = data[:, :, np.newaxis]
flat_data_array = data.transpose(2,1,0).flatten()
vtk_data = numpy_to_vtk(num_array=flat_data_array, deep=True, array_type=vtk.VTK_FLOAT)
shape = data.shape
img = vtk.vtkImageData()
img.GetPointData().SetScalars(vtk_data)
img.SetDimensions(shape[0], shape[1], shape[2])
return img
img = np.zeros(shape=[512, 512])
img[0:256, 0:256] = 0
img[0:256, 256:] = 64
img[256:, 0:256] = 128
img[256:, 256:] = 256
img = numpyToVTK(img)
class Widget(QWidget):
def __init__ (self):
super(). __init__ ()
layout = QVBoxLayout()
self.setLayout(layout)
self.vtkWidget = QVTKRenderWindowInteractor()
layout.addWidget(self.vtkWidget)
imgActor = vtk.vtkImageActor()
imgActor.SetInputData(img)
renderer = vtk.vtkRenderer()
renderer.AddActor(imgActor)
renderer.SetBackground(0.4, 0.5, 0.6)
renderWindow = self.vtkWidget.GetRenderWindow()
renderWindow.AddRenderer(renderer)
renderWindow.Render()
renderWindowInteractor = vtk.vtkRenderWindowInteractor()
style = vtk.vtkInteractorStyleImage()
renderWindowInteractor.SetInteractorStyle(style)
renderWindowInteractor.SetRenderWindow(renderWindow)
renderWindowInteractor.Initialize()
if __name__ == ' __main__':
app = QApplication(sys.argv)
win = Widget()
win.show()
app.exec_()
```
I find I can rotate the image in the `QVTKWidget` even the `vtkInteractorStyleImage` is used.
My environment is:
```auto
python 3.7
vtk 9.0.3
win 10
```
How can I apply `vtkInteractorStyleImage` in `QVTKWidget`?
---
### Author:  [@dgobbi](https://discourse.vtk.org/u/dgobbi)
#### Post date: [August 13, 2021, 3:51am UTC](https://discourse.vtk.org/t/vtkinteractorstyleimage-do-not-work-in-qvtkwidget/6358/2 "2021-08-13T03:51:00Z")
Replace this:
```python
renderWindowInteractor = vtk.vtkRenderWindowInteractor()
style = vtk.vtkInteractorStyleImage()
renderWindowInteractor.SetInteractorStyle(style)
renderWindowInteractor.SetRenderWindow(renderWindow)
renderWindowInteractor.Initialize()
```
with this:
```auto
style = vtk.vtkInteractorStyleImage()
self.vtkWidget.SetInteractorStyle(style)
```
The QVTKRenderWindowInteractor acts as a vtkRenderWindowInteractor (to be more specific, it uses a vtkGenericRenderWindowInteractor that processes Qt events).
That is why the class is called “QVTKRenderWindowInteractor”: it is a vtkRenderWindowInteractor (via duck typing), and it is also a Qt widget.
---
### Author:  [@zhang-qiang-github](https://discourse.vtk.org/u/zhang-qiang-github)
#### Post date: [August 13, 2021, 5:24am UTC](https://discourse.vtk.org/t/vtkinteractorstyleimage-do-not-work-in-qvtkwidget/6358/3 "2021-08-13T05:24:06Z")
Thank you very much, It is work.