ImageMathematics
VTKExamples/Cxx/Images/ImageMathematics
Code¶
ImageMathematics.cxx
#include <vtkSmartPointer.h> #include <vtkImageMapper3D.h> #include <vtkMath.h> #include <vtkImageData.h> #include <vtkImageCanvasSource2D.h> #include <vtkImageMathematics.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleImage.h> #include <vtkRenderer.h> #include <vtkImageActor.h> int main(int, char *[]) { // Create an image vtkSmartPointer<vtkImageCanvasSource2D> imageSource = vtkSmartPointer<vtkImageCanvasSource2D>::New(); imageSource->SetNumberOfScalarComponents(3); imageSource->SetScalarTypeToUnsignedChar(); imageSource->SetExtent(0, 4, 0, 4, 0, 0); imageSource->SetDrawColor(100.0, 0, 0); imageSource->FillBox(0, 4, 0, 4); imageSource->Update(); vtkSmartPointer<vtkImageMathematics> imageMath = vtkSmartPointer<vtkImageMathematics>::New(); imageMath->SetOperationToMultiplyByK(); imageMath->SetConstantK(2.0); imageMath->SetInputConnection(imageSource->GetOutputPort()); imageMath->Update(); // Create actors vtkSmartPointer<vtkImageActor> originalActor = vtkSmartPointer<vtkImageActor>::New(); originalActor->GetMapper()->SetInputConnection( imageSource->GetOutputPort()); vtkSmartPointer<vtkImageActor> mathActor = vtkSmartPointer<vtkImageActor>::New(); mathActor->GetMapper()->SetInputConnection( imageMath->GetOutputPort()); // Define viewport ranges // (xmin, ymin, xmax, ymax) double leftViewport[4] = {0.0, 0.0, 0.5, 1.0}; double rightViewport[4] = {0.5, 0.0, 1.0, 1.0}; // Setup renderers vtkSmartPointer<vtkRenderer> originalRenderer = vtkSmartPointer<vtkRenderer>::New(); originalRenderer->SetViewport(leftViewport); originalRenderer->AddActor(originalActor); originalRenderer->ResetCamera(); originalRenderer->SetBackground(.4, .5, .6); vtkSmartPointer<vtkRenderer> mathRenderer = vtkSmartPointer<vtkRenderer>::New(); mathRenderer->SetViewport(rightViewport); mathRenderer->AddActor(mathActor); mathRenderer->ResetCamera(); mathRenderer->SetBackground(.4, .5, .7); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetSize(600, 300); renderWindow->AddRenderer(originalRenderer); renderWindow->AddRenderer(mathRenderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); vtkSmartPointer<vtkInteractorStyleImage> style = vtkSmartPointer<vtkInteractorStyleImage>::New(); renderWindowInteractor->SetInteractorStyle(style); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ImageMathematics) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImageMathematics MACOSX_BUNDLE ImageMathematics.cxx) target_link_libraries(ImageMathematics ${VTK_LIBRARIES})
Download and Build ImageMathematics¶
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 ImageMathematics and its CMakeLists.txt file. Once the tarball ImageMathematics.tar has been downloaded and extracted,
cd ImageMathematics/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:
./ImageMathematics
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.