[Ctk-developers] Running error of 'vtkContextDevice2D'

[Quentan Qi]

Dear Community Members,

I’m now using CTK for VTK UI design, and want to use its `ctkVTKVolumePropertyWidget` widget, but received `no override found for 'vtkContextDevice2D’.` error. 

The test application `ctkVTKVolumePropertyWidgetTest1` of `/CTKBuild/CTK-build/bin/CTKVisualizationVTKWidgetsCppTests`receives the same error.

A mail list <http://marc.info/?l=vtk-developers&m=140685424721837&w=2> explains this error of the OpenGL override moving from `vtkContextDevice2D` to `Rendering/ContextOpenGL`, but I have no idea how to split it. Is there any detailed solution?


### CTK build options, using the latest CTK fork 02-Apr-2015
```
cmake -DCMAKE_MACOSX_RPATH:BOOL=OFF -DCMAKE_INSTALL_PREFIX:STRING=/usr/local/ctk -DCMAKE_BUILD_TYPE:STRING=Release -DCTK_ENABLE_Widgets:BOOL=ON -DCTK_LIB_Visualization/VTK/Widgets:BOOL=ON -DVTK_DIR:PATH=/usr/local/vtk/lib/cmake/vtk-6.2 -DCTK_BUILD_EXAMPLES:BOOL=ON -DCTK_LIB_ImageProcessing/ITK/Core:BOOL=ON -DITK_DIR:PATH=/usr/local/itk/lib/cmake/ITK-4.7 -DCTK_LIB_Visualization/VTK/Widgets_USE_TRANSFER_FUNCTION_CHARTS:BOOL=ON ../CTKSource
```

> Note: I used `-DCTK_LIB_Visualization/VTK/Widgets_USE_TRANSFER_FUNCTION_CHARTS:BOOL=ON` flag for volume transfer function widget. It is right?

### `CMakeLists.txt`
```
cmake_minimum_required(VERSION 3.1)

project(TEST_VTK_CTK)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

find_package(CTK REQUIRED)
include(${CTK_USE_FILE})

#find_package(ITK REQUIRED)
#include(${ITK_USE_FILE})

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

find_package(Qt4 REQUIRED)
include(${QT_USE_FILE})

set(SOURCE_FILES_6 PlayGround.cxx)
add_executable(Test6 MACOSX_BUNDLE ${SOURCE_FILES_6})
target_link_libraries(Test6 ${CTK_LIBRARIES} ${VTK_LIBRARIES})
```

### Source file
```
// Qt includes
#include <QApplication>

// CTK-VTK includes
#include "ctkVTKVolumePropertyWidget.h"

// VTK includes
#include <vtkColorTransferFunction.h>
#include <vtkPiecewiseFunction.h>
#include <vtkSmartPointer.h>
#include <vtkVolumeProperty.h>

// STD includes
#include <iostream>

//-----------------------------------------------------------------------------
int main(int argc, char * argv [] ) {

    QApplication app(argc, argv);

    vtkSmartPointer<vtkColorTransferFunction> ctf =
            vtkSmartPointer<vtkColorTransferFunction>::New();
    ctf->AddRGBPoint(0.2, 0.6941,0.76,0., 0.5, 0.);
    ctf->AddRGBPoint(0.4, 0.,0.6941,0.96);
    ctf->AddRGBPoint(0.8, 0.9686,0.76,0.);

    vtkSmartPointer<vtkPiecewiseFunction> otf =
            vtkSmartPointer<vtkPiecewiseFunction>::New();
    otf->AddPoint(0.2, 0.6941);
    otf->AddPoint(0.4, 0.641);
    otf->AddPoint(0.8, 0.9686);

    vtkSmartPointer<vtkPiecewiseFunction> otf2 =
            vtkSmartPointer<vtkPiecewiseFunction>::New();
    otf2->AddPoint(0.0, 0.6941);
    otf2->AddPoint(0.1, 0.641);
    otf2->AddPoint(0.7, 0.9686);

    vtkSmartPointer<vtkVolumeProperty> volumeProperty =
            vtkSmartPointer<vtkVolumeProperty>::New();
    volumeProperty->SetColor(ctf);
    volumeProperty->SetScalarOpacity(otf);
    double range[2] = {0., 1.};
    volumeProperty->GetGradientOpacity()->AdjustRange(range);

    ctkVTKVolumePropertyWidget widget;
//    widget.setUseThresholdSlider(true);
    widget.setVolumeProperty(volumeProperty);

    volumeProperty->SetScalarOpacity(otf2);

    widget.moveAllPoints(0.1, -0.1);
    widget.moveAllPoints(-0.1, 0.1);

    widget.show();

    return app.exec();
}
```

This is an example from `https://github.com/commontk/CTK/blob/master/Libs/Visualization/VTK/Widgets/Testing/Cpp/ctkVTKVolumePropertyWidgetTest1.cpp` <https://github.com/commontk/CTK/blob/master/Libs/Visualization/VTK/Widgets/Testing/Cpp/ctkVTKVolumePropertyWidgetTest1.cpp%60>.

### Running error info (No compiling error)
```
Generic Warning: In /Develop/VTK/VTKSource-6.2.0/Rendering/Context2D/vtkContextDevice2D.cxx, line 27
Error: no override found for 'vtkContextDevice2D'.


Process finished with exit code 11
```

Cheers,
Quentan
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