ImageShiftScale
VTKExamples/Cxx/Images/ImageShiftScale
Code
ImageShiftScale.cxx
#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkImageShiftScale.h>
#include <vtkImageEllipsoidSource.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkImageSlice.h>
#include <vtkImageSliceMapper.h>
#include <vtkImageProperty.h>
#include <vtkPNGWriter.h>
static void CreateImage(vtkImageData*);
int main(int, char *[])
{
// Create an image
vtkSmartPointer<vtkImageData> image = vtkSmartPointer<vtkImageData>::New();
CreateImage(image);
vtkSmartPointer<vtkImageShiftScale> shiftScaleFilter =
vtkSmartPointer<vtkImageShiftScale>::New();
shiftScaleFilter->SetOutputScalarTypeToUnsignedChar();
#if VTK_MAJOR_VERSION <= 5
shiftScaleFilter->SetInputConnection(image->GetProducerPort());
#else
shiftScaleFilter->SetInputData(image);
#endif
shiftScaleFilter->SetShift(100);
shiftScaleFilter->SetScale(1);
shiftScaleFilter->Update();
// Create actors
vtkSmartPointer<vtkImageSliceMapper> originalSliceMapper = vtkSmartPointer<vtkImageSliceMapper>::New();
#if VTK_MAJOR_VERSION <= 5
originalSliceMapper->SetInputConnection(image->GetProducerPort());
#else
originalSliceMapper->SetInputData(image);
#endif
vtkSmartPointer<vtkImageSlice> originalSlice = vtkSmartPointer<vtkImageSlice>::New();
originalSlice->SetMapper(originalSliceMapper);
originalSlice->GetProperty()->SetInterpolationTypeToNearest();
vtkSmartPointer<vtkImageSliceMapper> shiftScaleMapper = vtkSmartPointer<vtkImageSliceMapper>::New();
shiftScaleMapper->SetInputConnection(shiftScaleFilter->GetOutputPort());
vtkSmartPointer<vtkImageSlice> shiftScaleSlice = vtkSmartPointer<vtkImageSlice>::New();
shiftScaleSlice->SetMapper(shiftScaleMapper);
shiftScaleSlice->GetProperty()->SetInterpolationTypeToNearest();
// Define viewport ranges
// (xmin, ymin, xmax, ymax)
double originalViewport[4] = {0.0, 0.0, 0.5, 1.0};
double shiftScaleViewport[4] = {0.5, 0.0, 1.0, 1.0};
// Setup renderers
vtkSmartPointer<vtkRenderer> originalRenderer =
vtkSmartPointer<vtkRenderer>::New();
originalRenderer->SetViewport(originalViewport);
originalRenderer->AddViewProp(originalSlice);
originalRenderer->ResetCamera();
originalRenderer->SetBackground(.4, .5, .6);
vtkSmartPointer<vtkRenderer> shiftScaleRenderer =
vtkSmartPointer<vtkRenderer>::New();
shiftScaleRenderer->SetViewport(shiftScaleViewport);
shiftScaleRenderer->AddViewProp(shiftScaleSlice);
shiftScaleRenderer->ResetCamera();
shiftScaleRenderer->SetBackground(.4, .5, .7);
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->SetSize(600, 300);
renderWindow->AddRenderer(originalRenderer);
renderWindow->AddRenderer(shiftScaleRenderer);
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(vtkImageData* image)
{
unsigned int dim = 20;
image->SetDimensions(dim, dim, 1);
#if VTK_MAJOR_VERSION <= 5
image->SetNumberOfScalarComponents(1);
image->SetScalarTypeToUnsignedChar();
image->AllocateScalars();
#else
image->AllocateScalars(VTK_UNSIGNED_CHAR,1);
#endif
for(unsigned int x = 0; x < dim; x++)
{
for(unsigned int y = 0; y < dim; y++)
{
unsigned char* pixel = static_cast<unsigned char*>(image->GetScalarPointer(x,y,0));
if(x < dim/2)
{
pixel[0] = 50;
}
else
{
pixel[0] = 150;
}
}
}
image->Modified();
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ImageShiftScale)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ImageShiftScale MACOSX_BUNDLE ImageShiftScale.cxx)
target_link_libraries(ImageShiftScale ${VTK_LIBRARIES})
Download and Build ImageShiftScale
Click here to download ImageShiftScale and its CMakeLists.txt file. Once the tarball ImageShiftScale.tar has been downloaded and extracted,
cd ImageShiftScale/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:
./ImageShiftScale
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.