[vtkusers] Problem with cursoring in vtkImagePlaneWidget

[David Gobbi]

Hi Peter,

Right now I'm working on a class called "vtkImageOrthoPlanes" that 
listens to events from three vtkImagePlaneWidgets in order to make it so 
that when one plane is rotated, the other two planes are rotated by the 
same amount.  I think that I can modify my class so that it will also 
automatically move the focus from one plane to the next when the cursor 
is moved between the planes.  I will try to do this, and if it works, I 
can add the class to VTK cvs.

In general it is difficult to have a cursor-type action move from on 
plane to another, because once you click on a widget, that widget will 
keep the focus until you release the mouse button.  You shouldn't have 
to move the plane with the middle mouse button in order to select it, 
though, clicking the plane with the left mouse button should do the job.

 - David


Peter Kok wrote:
>
> Hi there,
>
>  
>
> I have a problem when I try to use the cursor in the 
> vtkImagePlaneWidget. I have three imagePlaneWidgets, with the 
> orientation to the x, y and z-axis. When I want to use the cursor in 
> one of the planes, the plane seems to need some kind of focus for the 
> cursor to work as desired. That is, I first need to select a plane by 
> moving it slightly using the middle mouse button. When I then use the 
> cursor, it works well, but only on that plane. If a plane doesn't have 
> the focus, the cursor doesn't work, the displayed text is "Off image" 
> and the edge turns to green.
>
>  
>
> The code I use to set up the image planes is not extremely exciting:
>
>  
>
> planeWidgetX = vtkImagePlaneWidget::New();
>
> planeWidgetX->DisplayTextOn();
>
> planeWidgetX->SetInput(checkers->GetOutput());
>
> planeWidgetX->SetPlaneOrientationToXAxes();
>
> planeWidgetX->SetSliceIndex((wholeExtent[0] + wholeExtent[1]) / 2);
>
> planeWidgetX->SetPicker(cellPicker);
>
> planeWidgetX->SetKeyPressActivationValue('x');
>
> planeWidgetX->GetPlaneProperty()->SetColor(1, 0, 0);
>
> planeWidgetX->SetWindowLevel(256, 128);
>
> planeWidgetX->GetColorMap()->PassAlphaToOutputOff();
>
> planeWidgetX->SetInteractor(iren);
>
> planeWidgetX->On();
>
>  
>
> With similar code for the y- and z-plane. Does anyone have an idea of 
> what the problem (and preferably also the solution) might be?
>
>  
>
> Thanks,
>
>  
>
> -Peter
>
>  
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> This is the private VTK discussion list. 
> Please keep messages on-topic. Check the FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
>