[Ctk-developers] ctkTransferFunctionWidget examples

[Ricardo Ortiz]

Alright,

The problem was in the module widget connection to the volume node...

Thanks for your help Julien.

/Ricardo

On Wed, Nov 19, 2014 at 1:19 PM, Ricardo Ortiz <ricardo.ortiz at kitware.com>
wrote:

> Hi Julien,
>
> Thanks for the feedback...
>
> On Wed, Nov 19, 2014 at 12:16 PM, Julien Finet <julien.finet at kitware.com>
> wrote:
>
>> Hi Ricardo,
>>
>> ctkTransferFunctionWidget is obsolete, please use the VTK charts instead:
>>
>> https://github.com/commontk/CTK/blob/master/Libs/Visualization/VTK/Widgets/ctkVTKChartView.h
>>
>> In your case you might want to use ctkVTKScalarsToColorsWidget
>> <https://github.com/commontk/CTK/blob/master/Libs/Visualization/VTK/Widgets/ctkVTKScalarsToColorsWidget.h>
>>
>
> This is the widget that I am using (sorry I meant to say
> ctkVTKScalarsToColorsWidget in the thread below).
> I am looking at how the Volume Rendering (VolumePropertiesWidget) module
> is using this widget, and my understanding is that
> ctkVTKVolumePropertiyWidget (used by VolumePropertiesWidget) uses a
> vtkColorTransferFunction to update the view.
>
> The main problem is that for some reason the widget does not display
> anything (only white).
>
> Here is a snippet of how I update the ctkVTKScalarsToColorsWidget widget
> (or see the updateTransferFunction() in the attached file):
>
> void updateTransferFunction()
> {
> ...
>   d->ColorTransferFunction->SetAlpha(1.0);
>   d->ColorTransferFunction->Build();
>
>
> d->HistogramWidget->view()->setColorTransferFunctionToPlots(d->ColorTransferFunction);
> }
>
> Where d->HistogramWidget is an instance of ctkVTKScalarsToColorsWidget.
>
> Thanks,
>
> /Ricardo
>
>
>> Hth,
>> Julien.
>>
>> On Wed, Nov 19, 2014 at 5:19 PM, Ricardo Ortiz <ricardo.ortiz at kitware.com
>> > wrote:
>>
>>> To give a bit more context...
>>>
>>> I am using ctkScalarsToColorsWidget in order to create a color histogram
>>> of the displayed volume using a vtkColorTransferFunction.
>>>
>>> The problem is that the widget is not displaying anything.
>>> I am using the widget's view (ctkScalarsToColorsView) and
>>> calling setColorTransferFunctionToPlots to update its color transfer
>>> function (once I have updated it).
>>>
>>> Is this the correct way to have the widget display the colors?
>>>
>>> Thanks in advance,
>>>
>>> /Ricardo
>>>
>>>
>>>
>>> On Wed, Nov 19, 2014 at 10:19 AM, Ricardo Ortiz <
>>> ricardo.ortiz at kitware.com> wrote:
>>>
>>>> Hello folks,
>>>>
>>>> Does anyone knows of any examples that use transfer function widgets. I
>>>> am trying to create a simple histogram widget (and being able to select
>>>> points within the widget).
>>>>
>>>> Thanks in advance,
>>>>
>>>> /Ricardo
>>>>
>>>
>>>
>>> _______________________________________________
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>>> Ctk-developers at public.kitware.com
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>>>
>>>
>> ​​​
>  qSlicerScalarVolumeIntensitySegmenterHistogramWidget.cxx
> <https://docs.google.com/a/kitware.com/file/d/0B5C_y6Y3RlVnZWxQMXlpUFRjV28/edit?usp=drive_web>
> ​
>
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