[vtkusers] Size of labels in vtkScalarBarActor

[Cory Quammen]

[snip]

> Then, I tried to define the LookupTable as vtkDiscretizableColorTransferFunction,
> but I can't find the way to make it work.
> First of all, I would like to define the first and last value, and map
> between them using a given number of values (see call
> SetNumberOfTableValues). In vtkLookupTable I do this by setting the HSV
> range. I guess I could do the same calling vtkDiscretizableColorTransferFunction::AddHSVPoint().
> But the colors in between are not correct.
>


By default the vtkDiscretizableColorTransferFunction interpolates colors
through the RGB color space. To replicate what the vtkLookupTable does, you
will need to call

tempLUT->SetColorSpaceToHSV();


> Second thing is that the range is wrong and the method vtkScalarsToColors::SetTableRange
> is not available in vtkDiscretizableColorTransferFunction.
>

tempLUT->SetRange(min, max); should do the trick.

HTH,
Cory


> See in the screenshot how the values go from 0 to 1 instead of from 293 to
> 630...
>
> Here's the code of how I do it with vtkLookupTable:
> vtkSmartPointer<vtkLookupTable> tempLUT = vtkSmartPointer<
> vtkLookupTable>::New();
> tempLUT->SetRampToLinear();
> tempLUT->SetTableRange (rangeForTable);
> tempLUT->SetNumberOfTableValues(m_configuration.numOfColors);
> tempLUT->SetHueRange (m_configuration.rangeHue[0],
> m_configuration.rangeHue[1]);
> tempLUT->SetSaturationRange (m_configuration.rangeSaturation[0],
> m_configuration.rangeSaturation[1]);
> tempLUT->SetValueRange (m_configuration.rangeValue[0],
> m_configuration.rangeValue[1]);
> tempLUT->Build();
>
> Here's my code with vtkDiscretizableColorTransferFunction, which doesn't
> work (see screenshot):
> vtkSmartPointer<vtkDiscretizableColorTransferFunction> tempLUT =
> vtkSmartPointer<vtkDiscretizableColorTransferFunction>::New();
> tempLUT->AddHSVPoint(0, m_configuration.rangeHue[0], m_configuration.rangeSaturation[0],
> m_configuration.rangeValue[0]);
> tempLUT->AddHSVPoint(1, m_configuration.rangeHue[1], m_configuration.rangeSaturation[1],
> m_configuration.rangeValue[1]);
> tempLUT->SetNumberOfValues(m_configuration.numOfColors);
> tempLUT->SetIndexedLookup(0);
> tempLUT->Build();
>
> I attach a screenshot of the difference I get.
>
> Thank you!
>
> On 12 October 2017 at 15:37, Cory Quammen <cory.quammen at kitware.com>
> wrote:
>
>> Fernando,
>>
>> Because you are using a scalar bar actor from ParaView, I suggest using
>> the vtkContext2DScalarBarActor. Font sizes are fixed in this scalar bar
>> actor implementation.
>>
>> HTH,
>> Cory
>>
>> On Thu, Oct 12, 2017 at 9:33 AM, Fernando Nellmeldin <
>> f.nellmeldin at open-engineering.com> wrote:
>>
>>> Hello.
>>>
>>> I know that this issue was discussed many times before in this list, but
>>> I can't find a way to do what I want. I'm using VTK 7.1.1 (under Windows).
>>> So maybe there were some improvements.
>>>
>>> In fact, I'm using vtkPVScalarBarActor which includes some very well
>>> welcomed improvements, but the discussion should apply also to the normal
>>> vtkScalarBarActor.
>>> https://www.paraview.org/ParaView/Doc/Nightly/www/cxx-doc/cl
>>> assvtkPVScalarBarActor.html
>>>
>>> The issue is that the size of the labels for values depends on the
>>> viewport. So when the viewport changes the size, the labels also change
>>> their size. Is it possible to avoid this? I would like to set the size of
>>> the labels as constant or at least to define a maximum/minimum size,
>>> because sometimes it gets veeeeery small/big and it is not very pleaseant.
>>>
>>> Thank you!
>>>
>>> PS:
>>> Here's my code to configure the vtkPVScalarBarActor, in case it's
>>> useful... (I guess there are some calls that are useless):
>>>
>>> vtkSmartPointer<vtkPVScalarBarActor> scalarBarActor =
>>> vtkSmartPointer<vtkPVScalarBarActor>::New();
>>> scalarBarActor->GetPositionCoordinate()->SetCoordinateSystemToDisplay();
>>> scalarBarActor->GetPositionCoordinate()->SetValue(20, 20, 0.0);
>>>
>>> scalarBarActor->SetAddRangeAnnotations(0);
>>> scalarBarActor->DrawTickMarksOff();
>>> scalarBarActor->UnconstrainedFontSizeOff();
>>> scalarBarActor->AnnotationTextScalingOn();
>>> scalarBarActor->SetFixedAnnotationLeaderLineColor(true);
>>>
>>> scalarBarActor->SetOrientationToVertical();
>>> //scalarBarActor->SetWidth(0.1); // width in viewport coordinates
>>> scalarBarActor->SetMaximumWidthInPixels(80);
>>> scalarBarActor->GetLabelTextProperty()->BoldOff();
>>> scalarBarActor->GetLabelTextProperty()->ItalicOff();
>>> scalarBarActor->GetLabelTextProperty()->ShadowOn();
>>> scalarBarActor->AutomaticLabelFormatOff();
>>> scalarBarActor->SetLabelFormat("%.2f");
>>> scalarBarActor->SetRangeLabelFormat(scalarBarActor->GetLabelFormat());
>>> scalarBarActor->SetMaximumNumberOfColors(100);
>>> scalarBarActor->SetNumberOfLabels(5);
>>>
>>> scalarBarActor->SetLookupTable(tempLUT); // defined elsewhere, doesn't
>>> matter
>>>
>>> scalarBarActor->SetTitle("Displacements");
>>> scalarBarActor->SetTitleJustification(VTK_TEXT_RIGHT);
>>> scalarBarActor->GetTitleTextProperty()->SetFontSize(8);
>>>
>>>
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>>
>>
>> --
>> Cory Quammen
>> Staff R&D Engineer
>> Kitware, Inc.
>>
>
>
>
> --
> *Fernando NELLMELDIN*
> Software Engineer
> *_______________________________________________________________*
>
> *Open Engineering s.a.*
>
> Rue Bois Saint-Jean 15
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>
> http://www.open-engineering.com
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>
> *_________________________________________________________________________*
>



-- 
Cory Quammen
Staff R&D Engineer
Kitware, Inc.
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