# SideBySideGraphs

VTKExamples/Cxx/Graphs/SideBySideGraphs

### Description

This currently crashes - still trying to decide how to best display these graphs.

### Code

SideBySideGraphs.cxx

    #include <vtkSmartPointer.h>
    #include <vtkGraphToPolyData.h>
    #include <vtkDataSetAttributes.h>
    #include <vtkMutableUndirectedGraph.h>
    #include <vtkGraphLayoutView.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>

    int main(int, char *[])
    {
      // Create the first graph
      vtkSmartPointer<vtkMutableUndirectedGraph> g0 =
        vtkSmartPointer<vtkMutableUndirectedGraph>::New();
      {
      vtkIdType v1 = g0->AddVertex();
      vtkIdType v2 = g0->AddVertex();
      vtkIdType v3 = g0->AddVertex();

      g0->AddEdge(v1, v2);
      g0->AddEdge(v2, v3);
      g0->AddEdge(v1, v3);

      // Create points
      vtkSmartPointer<vtkPoints> points =
        vtkSmartPointer<vtkPoints>::New();
      points->InsertNextPoint(0.0, 0.0, 0.0);
      points->InsertNextPoint(1.0, 0.0, 0.0);
      points->InsertNextPoint(0.0, 1.0, 0.0);

      // Add the coordinates of the points to the graph
      g0->SetPoints(points);
      }

      // Create the second graph
      vtkSmartPointer<vtkMutableUndirectedGraph> g1 =
        vtkSmartPointer<vtkMutableUndirectedGraph>::New();

      vtkIdType v1 = g1->AddVertex();
      vtkIdType v2 = g1->AddVertex();

      g1->AddEdge(v1, v2);

      // Create points
      vtkSmartPointer<vtkPoints> points =
        vtkSmartPointer<vtkPoints>::New();
      points->InsertNextPoint(0.0, 0.0, 0.0);
      points->InsertNextPoint(1.0, 0.0, 0.0);

      // Add the coordinates of the points to the graph
      g1->SetPoints(points);

      // There will be one render window
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->SetSize(600, 300);

      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();

      // 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};

      vtkSmartPointer<vtkGraphLayoutView> graphLayoutView0 =
        vtkSmartPointer<vtkGraphLayoutView>::New();
      graphLayoutView0->SetRenderWindow(renderWindow);
      graphLayoutView0->SetInteractor(renderWindowInteractor);
      graphLayoutView0->GetRenderer()->SetViewport(leftViewport);
      graphLayoutView0->AddRepresentationFromInput(g0);
      graphLayoutView0->ResetCamera();
      graphLayoutView0->Render();

      vtkSmartPointer<vtkGraphLayoutView> graphLayoutView1 =
        vtkSmartPointer<vtkGraphLayoutView>::New();
      graphLayoutView1->SetRenderWindow(renderWindow);
      graphLayoutView1->SetInteractor(renderWindowInteractor);
      graphLayoutView1->GetRenderer()->SetViewport(rightViewport);
      graphLayoutView1->AddRepresentationFromInput(g1);
      graphLayoutView1->ResetCamera();
      graphLayoutView1->Render();

      //graphLayoutView0->GetInteractor()->Start();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(SideBySideGraphs)

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

    add_executable(SideBySideGraphs MACOSX_BUNDLE SideBySideGraphs.cxx )

    target_link_libraries(SideBySideGraphs ${VTK_LIBRARIES})

### Download and Build SideBySideGraphs

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

    cd SideBySideGraphs/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:

    ./SideBySideGraphs

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.