ImageOrder
VTKExamples/Cxx/Visualization/ImageOrder
Code
ImageOrder.cxx
#include <vtkVersion.h>
#include <vtkImageActor.h>
#include <vtkImageData.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>
static void CreateWhiteImage(vtkSmartPointer<vtkImageData> image);
static void CreateRedImage(vtkSmartPointer<vtkImageData> image);
int main(int, char* [])
{
// Image 1
vtkSmartPointer<vtkImageData> whiteImage =
vtkSmartPointer<vtkImageData>::New();
CreateWhiteImage(whiteImage);
vtkSmartPointer<vtkImageActor> whiteImageActor =
vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
whiteImageActor->SetInput(whiteImage);
#else
whiteImageActor->SetInputData(whiteImage);
#endif
// Image 2
vtkSmartPointer<vtkImageData> redImage =
vtkSmartPointer<vtkImageData>::New();
CreateRedImage(redImage);
vtkSmartPointer<vtkImageActor> redImageActor =
vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
redImageActor->SetInput(redImage);
#else
redImageActor->SetInputData(redImage);
#endif
// Visualize
vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
// Red image is displayed
renderer->AddActor(whiteImageActor);
renderer->AddActor(redImageActor);
// White image is displayed
//renderer->AddActor(redImageActor);
//renderer->AddActor(whiteImageActor);
renderer->ResetCamera();
vtkSmartPointer<vtkRenderWindow> renderWindow =
vtkSmartPointer<vtkRenderWindow>::New();
renderWindow->AddRenderer(renderer);
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 CreateWhiteImage(vtkSmartPointer<vtkImageData> image)
{
// Create a white image
image->SetDimensions(10,10,1);
#if VTK_MAJOR_VERSION <= 5
image->SetNumberOfScalarComponents(3);
image->SetScalarTypeToUnsignedChar();
image->AllocateScalars();
#else
image->AllocateScalars(VTK_UNSIGNED_CHAR,3);
#endif
int* dims = image->GetDimensions();
for (int y = 0; y < dims[1]; y++)
{
for (int x = 0; x < dims[0]; x++)
{
unsigned char* pixel = static_cast<unsigned char*>(image->GetScalarPointer(x,y,0));
pixel[0] = 255;
pixel[1] = 255;
pixel[2] = 255;
}
}
}
void CreateRedImage(vtkSmartPointer<vtkImageData> image)
{
// Create a red image
image->SetDimensions(10,10,1);
#if VTK_MAJOR_VERSION <= 5
image->SetNumberOfScalarComponents(3);
image->SetScalarTypeToUnsignedChar();
image->AllocateScalars();
#else
image->AllocateScalars(VTK_UNSIGNED_CHAR,3);
#endif
int* dims = image->GetDimensions();
for (int y = 0; y < dims[1]; y++)
{
for (int x = 0; x < dims[0]; x++)
{
unsigned char* pixel = static_cast<unsigned char*>(image->GetScalarPointer(x,y,0));
pixel[0] = 255;
pixel[1] = 0;
pixel[2] = 0;
}
}
}
CMakeLists.txt
cmake_minimum_required(VERSION 2.8)
PROJECT(ImageOrder)
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
add_executable(ImageOrder MACOSX_BUNDLE ImageOrder.cxx)
target_link_libraries(ImageOrder ${VTK_LIBRARIES})
Download and Build ImageOrder
Click here to download ImageOrder and its CMakeLists.txt file. Once the tarball ImageOrder.tar has been downloaded and extracted,
cd ImageOrder/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:
./ImageOrder
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.