[vtkusers] vtkContour position error on QT widget

[xsun]

Hello all, 

I am using vtkContour widget to select contour on a dicom image displayed on
vtkImageViewer2. The select contour interaction is all fine in vtk native
render window, but when i render the vtkImageViewer2 in a QT widget, the
contour selection position went wrong. 

I use GetNthNodeDisplayPosition method of vtkContourRepresentation class to
get the position of a contour point, the x position is okay but the y
position is always 180px larger than expected, this makes the point
displayed on screen is 180px lower than the point I clicked. 

I have been confused for few days, anyone could give me any idea why the
position went wrong and how may I fix it? 
<http://vtk.1045678.n5.nabble.com/file/n5742341/fuck.png> 



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