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// Test the vtkNIFTIReader by displaying an image.
#include "vtkNIFTIReader.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkInteractorStyleImage.h"
#include "vtkRenderWindow.h"
#include "vtkRenderer.h"
#include "vtkCamera.h"
#include "vtkMatrix4x4.h"
#include "vtkImageData.h"
#include "vtkImageReslice.h"
#include "vtkImageSliceMapper.h"
#include "vtkImageProperty.h"
#include "vtkImageSlice.h"
#include "vtkImageReader2.h"
#include "vtkSmartPointer.h"
#include "vtkStringArray.h"
#include "vtkErrorCode.h"
int main(int argc, char *argv[])
{
vtkSmartPointer<vtkRenderWindowInteractor> iren =
vtkSmartPointer<vtkRenderWindowInteractor>::New();
vtkSmartPointer<vtkInteractorStyleImage> style =
vtkSmartPointer<vtkInteractorStyleImage>::New();
style->SetInteractionModeToImage3D();
vtkSmartPointer<vtkRenderWindow> renWin =
vtkSmartPointer<vtkRenderWindow>::New();
iren->SetRenderWindow(renWin);
iren->SetInteractorStyle(style);
const char *filename = nullptr;
if (argc > 1)
{
filename = argv[1];
}
vtkSmartPointer<vtkNIFTIReader> reader =
vtkSmartPointer<vtkNIFTIReader>::New();
reader->SetFileName(filename);
reader->Update();
if (reader->GetErrorCode() != vtkErrorCode::NoError)
{
return 1;
}
vtkSmartPointer<vtkMatrix4x4> matrix =
vtkSmartPointer<vtkMatrix4x4>::New();
if (reader->GetQFormMatrix())
{
matrix->DeepCopy(reader->GetQFormMatrix());
matrix->Invert();
}
else if (reader->GetSFormMatrix())
{
matrix->DeepCopy(reader->GetSFormMatrix());
matrix->Invert();
}
vtkSmartPointer<vtkImageReslice> reslice =
vtkSmartPointer<vtkImageReslice>::New();
reslice->SetInputConnection(reader->GetOutputPort());
reslice->SetResliceAxes(matrix);
reslice->SetInterpolationModeToLinear();
reslice->Update();
double range[2];
int extent[6];
reslice->GetOutput()->GetScalarRange(range);
reslice->GetOutput()->GetExtent(extent);
static double viewport[3][4] = {
{ 0.67, 0.0, 1.0, 0.5 },
{ 0.67, 0.5, 1.0, 1.0 },
{ 0.0, 0.0, 0.67, 1.0 },
};
// check if image is 2D
bool imageIs3D = (extent[5] > extent[4]);
for (int i = 2*(imageIs3D == 0); i < 3; i++)
{
vtkSmartPointer<vtkImageSliceMapper> imageMapper =
vtkSmartPointer<vtkImageSliceMapper>::New();
if (i < 3)
{
imageMapper->SetInputConnection(reslice->GetOutputPort());
}
imageMapper->SetOrientation(i % 3);
imageMapper->SliceAtFocalPointOn();
vtkSmartPointer<vtkImageSlice> image =
vtkSmartPointer<vtkImageSlice>::New();
image->SetMapper(imageMapper);
image->GetProperty()->SetColorWindow(range[1] - range[0]);
image->GetProperty()->SetColorLevel(0.5*(range[0] + range[1]));
image->GetProperty()->SetInterpolationTypeToNearest();
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
renderer->AddViewProp(image);
renderer->SetBackground(0.0, 0.0, 0.0);
if (imageIs3D)
{
renderer->SetViewport(viewport[i]);
}
renWin->AddRenderer(renderer);
// use center point to set camera
double *bounds = imageMapper->GetBounds();
double point[3];
point[0] = 0.5*(bounds[0] + bounds[1]);
point[1] = 0.5*(bounds[2] + bounds[3]);
point[2] = 0.5*(bounds[4] + bounds[5]);
double maxdim = 0.0;
for (int j = 0; j < 3; j++)
{
double s = 0.5*(bounds[2*j+1] - bounds[2*j]);
maxdim = (s > maxdim ? s : maxdim);
}
vtkCamera *camera = renderer->GetActiveCamera();
camera->SetFocalPoint(point);
if (imageMapper->GetOrientation() == 2)
{
point[imageMapper->GetOrientation()] -= 500.0;
camera->SetViewUp(0.0, +1.0, 0.0);
}
else
{
point[imageMapper->GetOrientation()] += 500.0;
camera->SetViewUp(0.0, 0.0, +1.0);
}
camera->SetPosition(point);
camera->ParallelProjectionOn();
camera->SetParallelScale(maxdim);
}
if (imageIs3D)
{
renWin->SetSize(600, 400);
}
else
{
renWin->SetSize(400, 400);
}
renWin->Render();
iren->Start();
// code for generating a regression image
//int retVal = vtkRegressionTestImage( renWin );
//if ( retVal == vtkRegressionTester::DO_INTERACTOR )
// {
// iren->Start();
// }
// return !retVal;
return 0;
}
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