ImageShiftScale
VTKExamples/Cxx/Images/ImageShiftScale
Code¶
ImageShiftScale.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkImageData.h> #include <vtkImageCanvasSource2D.h> #include <vtkImageShiftScale.h> #include <vtkImageEllipsoidSource.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleImage.h> #include <vtkRenderer.h> #include <vtkImageSlice.h> #include <vtkImageSliceMapper.h> #include <vtkImageProperty.h> #include <vtkPNGWriter.h> static void CreateImage(vtkImageData*); int main(int, char *[]) { // Create an image vtkSmartPointer<vtkImageData> image = vtkSmartPointer<vtkImageData>::New(); CreateImage(image); vtkSmartPointer<vtkImageShiftScale> shiftScaleFilter = vtkSmartPointer<vtkImageShiftScale>::New(); shiftScaleFilter->SetOutputScalarTypeToUnsignedChar(); #if VTK_MAJOR_VERSION <= 5 shiftScaleFilter->SetInputConnection(image->GetProducerPort()); #else shiftScaleFilter->SetInputData(image); #endif shiftScaleFilter->SetShift(100); shiftScaleFilter->SetScale(1); shiftScaleFilter->Update(); // Create actors vtkSmartPointer<vtkImageSliceMapper> originalSliceMapper = vtkSmartPointer<vtkImageSliceMapper>::New(); #if VTK_MAJOR_VERSION <= 5 originalSliceMapper->SetInputConnection(image->GetProducerPort()); #else originalSliceMapper->SetInputData(image); #endif vtkSmartPointer<vtkImageSlice> originalSlice = vtkSmartPointer<vtkImageSlice>::New(); originalSlice->SetMapper(originalSliceMapper); originalSlice->GetProperty()->SetInterpolationTypeToNearest(); vtkSmartPointer<vtkImageSliceMapper> shiftScaleMapper = vtkSmartPointer<vtkImageSliceMapper>::New(); shiftScaleMapper->SetInputConnection(shiftScaleFilter->GetOutputPort()); vtkSmartPointer<vtkImageSlice> shiftScaleSlice = vtkSmartPointer<vtkImageSlice>::New(); shiftScaleSlice->SetMapper(shiftScaleMapper); shiftScaleSlice->GetProperty()->SetInterpolationTypeToNearest(); // Define viewport ranges // (xmin, ymin, xmax, ymax) double originalViewport[4] = {0.0, 0.0, 0.5, 1.0}; double shiftScaleViewport[4] = {0.5, 0.0, 1.0, 1.0}; // Setup renderers vtkSmartPointer<vtkRenderer> originalRenderer = vtkSmartPointer<vtkRenderer>::New(); originalRenderer->SetViewport(originalViewport); originalRenderer->AddViewProp(originalSlice); originalRenderer->ResetCamera(); originalRenderer->SetBackground(.4, .5, .6); vtkSmartPointer<vtkRenderer> shiftScaleRenderer = vtkSmartPointer<vtkRenderer>::New(); shiftScaleRenderer->SetViewport(shiftScaleViewport); shiftScaleRenderer->AddViewProp(shiftScaleSlice); shiftScaleRenderer->ResetCamera(); shiftScaleRenderer->SetBackground(.4, .5, .7); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(600, 300); renderWindow->AddRenderer(originalRenderer); renderWindow->AddRenderer(shiftScaleRenderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); vtkSmartPointer<vtkInteractorStyleImage> style = vtkSmartPointer<vtkInteractorStyleImage>::New(); renderWindowInteractor->SetInteractorStyle(style); renderWindowInteractor->SetRenderWindow(renderWindow); renderWindowInteractor->Initialize(); renderWindowInteractor->Start(); return EXIT_SUCCESS; } void CreateImage(vtkImageData* image) { unsigned int dim = 20; image->SetDimensions(dim, dim, 1); #if VTK_MAJOR_VERSION <= 5 image->SetNumberOfScalarComponents(1); image->SetScalarTypeToUnsignedChar(); image->AllocateScalars(); #else image->AllocateScalars(VTK_UNSIGNED_CHAR,1); #endif for(unsigned int x = 0; x < dim; x++) { for(unsigned int y = 0; y < dim; y++) { unsigned char* pixel = static_cast<unsigned char*>(image->GetScalarPointer(x,y,0)); if(x < dim/2) { pixel[0] = 50; } else { pixel[0] = 150; } } } image->Modified(); }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ImageShiftScale) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImageShiftScale MACOSX_BUNDLE ImageShiftScale.cxx) target_link_libraries(ImageShiftScale ${VTK_LIBRARIES})
Download and Build ImageShiftScale¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download ImageShiftScale and its CMakeLists.txt file. Once the tarball ImageShiftScale.tar has been downloaded and extracted,
cd ImageShiftScale/build
If VTK is installed:
cmake ..
If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:
cmake -DVTK_DIR:PATH=/home/me/vtk_build ..
Build the project:
make
and run it:
./ImageShiftScale
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.