ImageTransparency
VTKExamples/Cxx/Visualization/ImageTransparency
Description¶
Seealso
Code¶
ImageTransparency.cxx
#include <vtkVersion.h> #include <vtkSmartPointer.h> #include <vtkLookupTable.h> #include <vtkImageData.h> #include <vtkImageMapper3D.h> #include <vtkImageMapToColors.h> #include <vtkJPEGReader.h> #include <vtkPointData.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleImage.h> #include <vtkRenderer.h> #include <vtkImageActor.h> static void CreateImage(vtkSmartPointer<vtkImageData> image); int main(int, char*[]) { vtkSmartPointer<vtkImageData> image = vtkSmartPointer<vtkImageData>::New(); CreateImage(image); // Create actor vtkSmartPointer<vtkImageActor> imageActor = vtkSmartPointer<vtkImageActor>::New(); #if VTK_MAJOR_VERSION <= 5 imageActor->SetInput(image); #else imageActor->GetMapper()->SetInputData(image); #endif // Visualize vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->AddActor(imageActor); renderer->ResetCamera(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); 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(vtkSmartPointer<vtkImageData> image) { // Specify the size of the image data image->SetDimensions(10,10,1); #if VTK_MAJOR_VERSION <= 5 image->SetNumberOfScalarComponents(4); image->SetScalarTypeToUnsignedChar(); #else image->AllocateScalars(VTK_UNSIGNED_CHAR,4); #endif int* dims = image->GetDimensions(); // int dims[3]; // can't do this std::cout << "Dims: " << " x: " << dims[0] << " y: " << dims[1] << " z: " << dims[2] << std::endl; // Fill every entry of the image with "2" for (int y = 0; y < dims[1]; y++) { for (int x = 0; x < dims[0]; x++) { unsigned char* pixel = static_cast<unsigned char*>(image->GetScalarPointer(x,y,0)); pixel[0] = 255; pixel[1] = 255; pixel[2] = 255; if(x<5) { pixel[3] = 0; } else { pixel[3] = 255; } } } }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ImageTransparency) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImageTransparency MACOSX_BUNDLE ImageTransparency.cxx) target_link_libraries(ImageTransparency ${VTK_LIBRARIES})
Download and Build ImageTransparency¶
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 ImageTransparency and its CMakeLists.txt file. Once the tarball ImageTransparency.tar has been downloaded and extracted,
cd ImageTransparency/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:
./ImageTransparency
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.