# DrawShapes

VTKExamples/Cxx/Images/DrawShapes

### Code

DrawShapes.cxx

    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>
    #include <vtkImageData.h>
    #include <vtkSmartPointer.h>
    #include <vtkImageViewer2.h>
    #include <vtkImageCanvasSource2D.h>

    int main(int, char *[])
    {
      // Create a blank, black image
      vtkSmartPointer<vtkImageCanvasSource2D> drawing =
        vtkSmartPointer<vtkImageCanvasSource2D>::New();
      drawing->SetScalarTypeToUnsignedChar();
      drawing->SetNumberOfScalarComponents(3);
      drawing->SetExtent(0, 20, 0, 50, 0, 0);
      drawing->FillBox(0,20,0,50);

      // Draw a red circle of radius 5 centered at (9,10)
      //drawing->SetDrawColor(255, 0, 0, 0.5);
      drawing->SetDrawColor(255, 0, 0, 0);
      drawing->DrawCircle(9, 10, 5);
      drawing->Update();

      // View the result
      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      vtkSmartPointer<vtkImageViewer2> imageViewer =
        vtkSmartPointer<vtkImageViewer2>::New();
      imageViewer->SetInputConnection(drawing->GetOutputPort());
      imageViewer->SetupInteractor(renderWindowInteractor);
      imageViewer->GetRenderer()->ResetCamera();
      imageViewer->GetRenderer()->SetBackground(1,1,1); //white background
      renderWindowInteractor->Initialize();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(DrawShapes)

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

    add_executable(DrawShapes MACOSX_BUNDLE DrawShapes.cxx)

    target_link_libraries(DrawShapes ${VTK_LIBRARIES})

### Download and Build DrawShapes

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

    cd DrawShapes/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:

    ./DrawShapes

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.