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
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.