[vtkusers] vtk zoom indicator

[Sankhesh Jhaveri]

I don’t think so. You could directly use the vtkAxisActor API instead of
using vtkLegendScaleActor to set the position coordinates of the two
endpoints.
​

On Mon, Nov 13, 2017 at 4:14 AM K O ranjith <kor1581 at gmail.com> wrote:

> Hello,
>
> Thanks for the tips it helped me.I would like to know if the length of axes
> of the legendactor can be modified.I used the corneroffsetfactor value to
> change it.Can it be changed using any other means.
>
> Thanks in Advance
>
> On Tue, Nov 7, 2017 at 9:37 PM, Sankhesh Jhaveri <
> sankhesh.jhaveri at kitware.com> wrote:
>
>> There’s no direct API but you can calculate it. All you have to do is
>> compute the length of the axis in world coordinates.
>>
>> Something like this:
>>
>> double * leftPoint = axis->GetPositionCoordinate()->GetComputedWorldValue(renderer);double * rightPoint = axis->GetPosition2Coordinate()->GetComputedWorldValue(renderer);double distance = vtkMath::sqrt(vtkMath::Distance2BetweenPoints(leftPoint, rightPoint));// Scale is 1 : distance
>>
>> Hope that helps.
>>
>> Best,
>> Sankhesh
>> ​
>>
>> On Tue, Nov 7, 2017 at 4:30 AM K O ranjith <kor1581 at gmail.com> wrote:
>>
>>> Hello,
>>> Thanks, it's  working.
>>> Can I get the measured value (which is displayed as label axis) from
>>> vtkLegendScaleActor object.
>>>
>>> Ranjith KO
>>>
>>> On Fri, Jun 23, 2017 at 7:52 PM, Sankhesh Jhaveri <
>>> sankhesh.jhaveri at kitware.com> wrote:
>>>
>>>> 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
>>>> ​
>>>>
>>>
>>> --
>> Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
>> <http://www.kitware.com/> | (518) 881-4417
>> ​
>>
>
> --
Sankhesh Jhaveri *Sr. Research & Development Engineer* | Kitware
<http://www.kitware.com/> | (518) 881-4417
​
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