[vtkusers] vtk zoom indicator

[Sankhesh Jhaveri]

Take a look at vtkLegendScaleActor
<http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/LegendScaleActor>.
It uses vtkAxisActor
<http://www.vtk.org/doc/nightly/html/classvtkAxisActor.html> internally.

Hth,
Sankhesh
​

On Fri, Jun 23, 2017 at 1:55 AM K O ranjith <kor1581 at gmail.com> wrote:

> I'm using vtk for developing a MRI DICOM Image viewer in Qt.
> The viewer uses vtkDICOMImageReader,  vtkImageViewer2 & QVTKWidget.
> I need to show a zoom indicator line which varies length with zoom value
> and need not affect other operation like rotate, pan( which is used for
> DICOM image in same window). It's position should be fixed at side of
> viewer and should not alter with zoom, pan, rotate.
> I added an line as an vtkactor  to the renderer using vtkLineSource.
>  Its length altering  with zoom as I intended, but problem is its position
> also altering with the zoom, also rotate and Pan affecting on it.
> How can I make the position of the line fixed at side of the viewer.
> Have any option in vtk for visual indication of zoom factor something like vtkOrientationMarkerWidget
> for orientation...
>
>
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-- 
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
​
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