ImageDivergence
VTKExamples/Cxx/Images/ImageDivergence
Code
ImageDivergence.cxx
#include <vtkSmartPointer.h>
#include <vtkImageCast.h>
#include <vtkImageData.h>
#include <vtkImageMapper3D.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkImageDivergence.h>
#include <vtkImageGradient.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkImageCorrelation.h>
#include <vtkInteractorStyleImage.h>
#include <vtkImageActor.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkImageMandelbrotSource.h>
int main(int, char *[])
{
// Create an image
vtkSmartPointer<vtkImageMandelbrotSource> source =
vtkSmartPointer<vtkImageMandelbrotSource>::New();
source->Update();
vtkSmartPointer<vtkImageCast> originalCastFilter =
vtkSmartPointer<vtkImageCast>::New();
originalCastFilter->SetInputConnection(source->GetOutputPort());
originalCastFilter->SetOutputScalarTypeToFloat();
originalCastFilter->Update();
// Compute the gradient (to produce a vector field)
vtkSmartPointer<vtkImageGradient> gradientFilter =
vtkSmartPointer<vtkImageGradient>::New();
gradientFilter->SetInputConnection(source->GetOutputPort());
gradientFilter->Update();
vtkSmartPointer<vtkImageDivergence> divergenceFilter =
vtkSmartPointer<vtkImageDivergence>::New();
divergenceFilter->SetInputConnection(gradientFilter->GetOutputPort());
divergenceFilter->Update();
vtkSmartPointer<vtkImageCast> divergenceCastFilter =
vtkSmartPointer<vtkImageCast>::New();
divergenceCastFilter->SetInputConnection(divergenceFilter->GetOutputPort());
divergenceCastFilter->SetOutputScalarTypeToFloat();
divergenceCastFilter->Update();
// Create actors
vtkSmartPointer<vtkImageActor> originalActor =
vtkSmartPointer<vtkImageActor>::New();
originalActor->GetMapper()->SetInputConnection(
originalCastFilter->GetOutputPort());
vtkSmartPointer<vtkImageActor> divergenceActor =
vtkSmartPointer<vtkImageActor>::New();
divergenceActor->GetMapper()->SetInputConnection(
divergenceCastFilter->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();
vtkSmartPointer<vtkRenderer> divergenceRenderer =
vtkSmartPointer<vtkRenderer>::New();
divergenceRenderer->SetViewport(rightViewport);
divergenceRenderer->AddActor(divergenceActor);
divergenceRenderer->ResetCamera();
// Setup render window
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetSize(600,300);
renderWindow->AddRenderer(originalRenderer);
renderWindow->AddRenderer(divergenceRenderer);
// 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(ImageDivergence)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ImageDivergence MACOSX_BUNDLE ImageDivergence.cxx)
target_link_libraries(ImageDivergence ${VTK_LIBRARIES})
Download and Build ImageDivergence
Click here to download ImageDivergence and its CMakeLists.txt file. Once the tarball ImageDivergence.tar has been downloaded and extracted,
cd ImageDivergence/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:
./ImageDivergence
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.