DrawShapes

VTKEx/Cxx/Images/DrawShapes

Question

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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
  imageViewer->GetRenderWindow()->Render();
  renderWindowInteractor->Initialize();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(DrawShapes)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkImagingSources
  vtkvtkInteractionImage
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping DrawShapes: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(DrawShapes MACOSX_BUNDLE DrawShapes.cxx )
  target_link_libraries(DrawShapes PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  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}
    )
endif ()

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

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