ImageAlgorithmFilter
VTKExamples/Cxx/Developers/ImageAlgorithmFilter
Description¶
This example demonstrates how to setup the pipeline for a {{class|vtkImageAlgorithm}} filter that takes a {{class|vtkImageData}} as input and produces another vtkImageData as output. This particular example creates a 2x2 image and fills it with "2"s. The filter changes the (0,0) element to a 5.
Code¶
ImageAlgorithmFilter.cxx
#include <vtkSmartPointer.h> #include "vtkImageAlgorithmFilter.h" #include "vtkImageData.h" void PrintImage(vtkImageData* image); int main (int argc, char *argv[]) { vtkSmartPointer<vtkImageData> input = vtkSmartPointer<vtkImageData>::New(); // Setup the image input->SetDimensions(2,2,1); input->AllocateScalars(VTK_DOUBLE,1); // Fill every entry of the image data with "2.0" int* dims = input->GetDimensions(); for (int y=0; y<dims[1]; y++) { for (int x=0; x<dims[0]; x++) { input->SetScalarComponentFromDouble(x,y,0,0,2.0); } } std::cout << "Input image: " << std::endl; PrintImage(input); vtkSmartPointer<vtkImageAlgorithmFilter> filter = vtkSmartPointer<vtkImageAlgorithmFilter>::New(); filter->SetInputData(input); filter->Update(); vtkImageData* output = filter->GetOutput(); std::cout << "Output image: " << std::endl; PrintImage(output); return 0; } void PrintImage(vtkImageData* image) { int* dims = image->GetDimensions(); for (int y=0; y<dims[1]; y++) { for (int x=0; x<dims[0]; x++) { double v = image->GetScalarComponentAsDouble(x,y,0,0); std::cout << v << " "; } std::cout << std::endl; } }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ImageAlgorithmFilter) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ImageAlgorithmFilter MACOSX_BUNDLE ImageAlgorithmFilter.cxx) target_link_libraries(ImageAlgorithmFilter ${VTK_LIBRARIES})
Download and Build ImageAlgorithmFilter¶
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Click here to download ImageAlgorithmFilter and its CMakeLists.txt file. Once the tarball ImageAlgorithmFilter.tar has been downloaded and extracted,
cd ImageAlgorithmFilter/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:
./ImageAlgorithmFilter
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.