ImageMapper
VTKExamples/Cxx/Visualization/ImageMapper
Description¶
This example demonstrates how to display an image in 2D. The size and position are in screen coordinates.
Code¶
ImageMapper.cxx
#include <vtkVersion.h> #include <vtkImageData.h> #include <vtkSmartPointer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleImage.h> #include <vtkRenderer.h> #include <vtkImageMapper.h> #include <vtkActor2D.h> #include <vtkImageSlice.h> static void CreateColorImage(vtkImageData*); int main(int, char *[]) { vtkSmartPointer<vtkImageData> colorImage = vtkSmartPointer<vtkImageData>::New(); CreateColorImage(colorImage); vtkSmartPointer<vtkImageMapper> imageMapper = vtkSmartPointer<vtkImageMapper>::New(); #if VTK_MAJOR_VERSION <= 5 imageMapper->SetInputConnection(colorImage->GetProducerPort()); #else imageMapper->SetInputData(colorImage); #endif imageMapper->SetColorWindow(255); imageMapper->SetColorLevel(127.5); vtkSmartPointer<vtkActor2D> imageActor = vtkSmartPointer<vtkActor2D>::New(); imageActor->SetMapper(imageMapper); imageActor->SetPosition(20, 20); // Setup renderers vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); // Setup render window vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); // Setup render window interactor vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); vtkSmartPointer<vtkInteractorStyleImage> style = vtkSmartPointer<vtkInteractorStyleImage>::New(); renderWindowInteractor->SetInteractorStyle(style); // Render and start interaction renderWindowInteractor->SetRenderWindow(renderWindow); //renderer->AddViewProp(imageActor); renderer->AddActor2D(imageActor); renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; } void CreateColorImage(vtkImageData* image) { unsigned int dim = 20; image->SetDimensions(dim, dim, 1); #if VTK_MAJOR_VERSION <= 5 image->SetNumberOfScalarComponents(3); image->SetScalarTypeToUnsignedChar(); image->AllocateScalars(); #else image->AllocateScalars(VTK_UNSIGNED_CHAR,3); #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] = 255; pixel[1] = 0; } else { pixel[0] = 0; pixel[1] = 255; } pixel[2] = 0; } } image->Modified(); }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ImageMapper) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImageMapper MACOSX_BUNDLE ImageMapper.cxx) target_link_libraries(ImageMapper ${VTK_LIBRARIES})
Download and Build ImageMapper¶
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 ImageMapper and its CMakeLists.txt file. Once the tarball ImageMapper.tar has been downloaded and extracted,
cd ImageMapper/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:
./ImageMapper
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.