ImageCityBlockDistance
VTKExamples/Cxx/Images/ImageCityBlockDistance
Description¶
Compute the Manhattan distance from every point to every black point in a binary image.
Code¶
ImageCityBlockDistance.cxx
#include <vtkImageData.h> #include <vtkImageMapper3D.h> #include <vtkImageCast.h> #include <vtkImageThreshold.h> #include <vtkJPEGReader.h> #include <vtkPNGReader.h> #include <vtkSmartPointer.h> #include <vtkImageExtractComponents.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleImage.h> #include <vtkRenderer.h> #include <vtkJPEGReader.h> #include <vtkImageActor.h> #include <vtkImageCityBlockDistance.h> int main(int argc, char *argv[]) { // Verify command line arguments if (argc < 2 ) { std::cout << "Usage: " << argv[0] << " BinaryImage.jpg" << std::endl; return EXIT_FAILURE; } // Parse command line arguments std::string inputFilename = argv[1]; // Read file vtkSmartPointer<vtkJPEGReader> reader = vtkSmartPointer<vtkJPEGReader>::New(); reader->SetFileName(inputFilename.c_str()); reader->Update(); vtkSmartPointer<vtkImageCast> castFilter = vtkSmartPointer<vtkImageCast>::New(); castFilter->SetOutputScalarTypeToShort(); castFilter->SetInputConnection(reader->GetOutputPort()); vtkSmartPointer<vtkImageCityBlockDistance> cityBlockDistanceFilter = vtkSmartPointer<vtkImageCityBlockDistance>::New(); cityBlockDistanceFilter->SetInputConnection(castFilter->GetOutputPort()); cityBlockDistanceFilter->SetDimensionality(2); cityBlockDistanceFilter->Update(); // Create actors vtkSmartPointer<vtkImageCast> inputCastFilter = vtkSmartPointer<vtkImageCast>::New(); inputCastFilter->SetOutputScalarTypeToUnsignedChar(); inputCastFilter->SetInputConnection(reader->GetOutputPort()); vtkSmartPointer<vtkImageActor> inputActor = vtkSmartPointer<vtkImageActor>::New(); inputActor->GetMapper()->SetInputConnection(inputCastFilter->GetOutputPort()); vtkSmartPointer<vtkImageCast> distanceCastFilter = vtkSmartPointer<vtkImageCast>::New(); distanceCastFilter->SetOutputScalarTypeToUnsignedChar(); distanceCastFilter->SetInputConnection(cityBlockDistanceFilter->GetOutputPort()); vtkSmartPointer<vtkImageActor> distanceActor = vtkSmartPointer<vtkImageActor>::New(); distanceActor->GetMapper()->SetInputConnection( distanceCastFilter->GetOutputPort()); // Define viewport ranges // (xmin, ymin, xmax, ymax) double inputViewport[4] = {0.0, 0.0, 0.5, 1.0}; double distanceViewport[4] = {0.5, 0.0, 1.0, 1.0}; // Setup renderers vtkSmartPointer<vtkRenderer> inputRenderer = vtkSmartPointer<vtkRenderer>::New(); inputRenderer->SetViewport(inputViewport); inputRenderer->AddActor(inputActor); inputRenderer->ResetCamera(); inputRenderer->SetBackground(.4, .5, .9); vtkSmartPointer<vtkRenderer> distanceRenderer = vtkSmartPointer<vtkRenderer>::New(); distanceRenderer->SetViewport(distanceViewport); distanceRenderer->AddActor(distanceActor); distanceRenderer->ResetCamera(); distanceRenderer->SetBackground(.4, .5, .7); // Setup render window vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(600, 300); renderWindow->AddRenderer(inputRenderer); renderWindow->AddRenderer(distanceRenderer); // 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); renderWindowInteractor->Initialize(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ImageCityBlockDistance) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImageCityBlockDistance MACOSX_BUNDLE ImageCityBlockDistance.cxx) target_link_libraries(ImageCityBlockDistance ${VTK_LIBRARIES})
Download and Build ImageCityBlockDistance¶
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 ImageCityBlockDistance and its CMakeLists.txt file. Once the tarball ImageCityBlockDistance.tar has been downloaded and extracted,
cd ImageCityBlockDistance/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:
./ImageCityBlockDistance
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.