# AlgorithmSource

VTKExamples/Cxx/Developers/AlgorithmSource

### Description

This example demonstrates how to create a source that returns a custom class. To test that it is working, the class vtkTest1 simply stores a double named 'Value' that is instantiated to the value of 4.5. Example.cxx instantiates a vtkTestSource which produces a vtkTest1.

### Code

AlgorithmSource.cxx

    #include <vtkSmartPointer.h>

    #include "vtkTestAlgorithmSource.h"
    #include "vtkTest1.h"

    int main(int, char *[])
    {
      vtkTestAlgorithmSource* source = vtkTestAlgorithmSource::New();
      source->Update();

      vtkTest1* test = source->GetOutput();
      std::cout << test->GetValue() << std::endl;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(AlgorithmSource)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(AlgorithmSource MACOSX_BUNDLE AlgorithmSource.cxx)

    target_link_libraries(AlgorithmSource ${VTK_LIBRARIES})

### Download and Build AlgorithmSource

Danger

The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.

Click here to download AlgorithmSource and its CMakeLists.txt file. Once the tarball AlgorithmSource.tar has been downloaded and extracted,

    cd AlgorithmSource/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:

    ./AlgorithmSource

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.