DrawShapes

#include <vtkImageCanvasSource2D.h>
#include <vtkImageViewer2.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>

#include <array>

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  std::array<double, 3> drawColor1{0, 0, 0};
  auto color1 = colors->GetColor3ub("DimGray").GetData();
  std::array<double, 3> drawColor2{0, 0, 0};
  auto color2 = colors->GetColor3ub("HotPink").GetData();
  for (auto i = 0; i < 3; ++i)
  {
    drawColor1[i] = color1[i];
    drawColor2[i] = color2[i];
  }

  // Create a blank, colored image.
  vtkNew<vtkImageCanvasSource2D> drawing;
  drawing->SetScalarTypeToUnsignedChar();
  drawing->SetNumberOfScalarComponents(3);
  drawing->SetExtent(0, 20, 0, 50, 0, 0);
  // Comment out or set color1 to "Black" if you want a black image.
  drawing->SetDrawColor(drawColor1.data());
  drawing->FillBox(0, 20, 0, 50);

  // Draw a red circle of radius 5 centered at (9,10).
  drawing->SetDrawColor(drawColor2.data());
  drawing->DrawCircle(9, 10, 5);
  drawing->Update();

  // View the result
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  vtkNew<vtkImageViewer2> imageViewer;
  imageViewer->SetInputConnection(drawing->GetOutputPort());
  imageViewer->SetupInteractor(renderWindowInteractor);
  imageViewer->GetRenderer()->GradientBackgroundOn();
  imageViewer->GetRenderer()->SetBackground(
      colors->GetColor3d("SkyBlue").GetData());
  imageViewer->GetRenderer()->SetBackground2(
      colors->GetColor3d("MidnightBlue").GetData());
  imageViewer->GetRenderer()->ResetCamera();
  imageViewer->GetRenderWindow()->SetWindowName("DrawShapes");
  imageViewer->GetRenderWindow()->Render();
  renderWindowInteractor->Initialize();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(DrawShapes)

find_package(VTK COMPONENTS 
  CommonColor
  CommonCore
  ImagingSources
  InteractionImage
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "DrawShapes: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
add_executable(DrawShapes MACOSX_BUNDLE DrawShapes.cxx )
  target_link_libraries(DrawShapes PRIVATE ${VTK_LIBRARIES}
)
# vtk_module_autoinit is needed
vtk_module_autoinit(
  TARGETS DrawShapes
  MODULES ${VTK_LIBRARIES}
)

cd DrawShapes/build

cmake ..

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

make

./DrawShapes