[Insight-users] Bad crop with mouse click

[Cary lorey]

Hello,

I am trying to retrieve the values of a pixel from a mouse clicks and I
pass the x and y parameters to the crop function , but when I click on the
image , the application crashes. here is my code:

class MouseInteractorStyle3 : public vtkInteractorStyleTrackballCamera
{
  public:
    static MouseInteractorStyle3* New();

    virtual void OnLeftButtonDown()
    {
typedef itk::Image<unsigned short,2> ImageType;


      std::cout << "Pressed left mouse button." << std::endl;
      int x = this->Interactor->GetEventPosition()[0];
      int y = this->Interactor->GetEventPosition()[1];

      vtkSmartPointer<vtkCoordinate> coordinate =
        vtkSmartPointer<vtkCoordinate>::New();
      coordinate->SetCoordinateSystemToDisplay();
      coordinate->SetValue(x,y,0);



      // This doesn't produce the right value if the sphere is zoomed in???
      double* world =
coordinate->GetComputedWorldValue(this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());
      std::cout << "World coordinate: " << world[0] << ", " << world[1] <<
", " << world[2] << std::endl;
 Crop(x,y);
      // Forward events
      vtkInteractorStyleTrackballCamera::OnLeftButtonDown();

    }
void Crop(int x, int y){
typedef itk::Image<unsigned short,2> ImageType;
typedef itk::ImageFileReader<ImageType> ReaderType;
typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
ReaderType::Pointer reader= ReaderType::New();
ConnectorType::Pointer Connector= ConnectorType::New();

ImageType::Pointer image = ImageType::New();
  ImageType::SizeType cropSize;

reader->SetFileName("C:/Test.jpg");
reader->Update();

image = reader->GetOutput();
    cropSize[0] = x;
    cropSize[1] = y;
typedef itk::CropImageFilter <ImageType, ImageType>
    CropImageFilterType;

  CropImageFilterType::Pointer cropFilter
    = CropImageFilterType::New();
  cropFilter->SetInput(image);
  cropFilter->SetBoundaryCropSize(cropSize);
  cropFilter->Update();

typedef itk::FlipImageFilter< ImageType >   FlipImageFilterType;

FlipImageFilterType::Pointer flipFilter = FlipImageFilterType::New ();
 // flipFilter->SetInput( reader->GetOutput() );
  flipFilter->SetInput( cropFilter->GetOutput() );

  bool flipAxes[3] = { false, true, false };
flipFilter->SetFlipAxes(flipAxes);
flipFilter->Update();

Connector->SetInput( flipFilter->GetOutput() );
vtkImageViewer* viewer= vtkImageViewer::New();

vtkRenderWindowInteractor* renderWindowInteractor =
vtkRenderWindowInteractor::New();
viewer->SetupInteractor( renderWindowInteractor);
viewer->SetInput( Connector->GetOutput() );
viewer->Render();
viewer->SetColorWindow( 255);
viewer->SetColorLevel(128);
renderWindowInteractor->Start();
}

};

vtkStandardNewMacro(MouseInteractorStyle3);



I spent a lot temp to seek a solution to a crop with mouse manipulation, I
tried to find a solution that unfortunately contains a bug, I count on you
to help me, I really need your help.

Please answer me!!
thank you
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