DistanceWidget

VTKEx/Cxx/Widgets/DistanceWidget

Description¶

Contributed by Arnaud Gelas

Click two points to see the distance between them.

Other languages

See (Java)

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code¶

DistanceWidget.cxx

#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSmartPointer.h>
#include <vtkDistanceWidget.h>
#include <vtkDistanceRepresentation.h>

int main(int, char *[])
{
  // A renderer and render window
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);

  // An interactor
  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  renderWindowInteractor->SetRenderWindow(renderWindow);

  vtkSmartPointer<vtkDistanceWidget> distanceWidget =
    vtkSmartPointer<vtkDistanceWidget>::New();
  distanceWidget->SetInteractor(renderWindowInteractor);
  distanceWidget->CreateDefaultRepresentation();
  static_cast<vtkDistanceRepresentation *>(distanceWidget->GetRepresentation())
    ->SetLabelFormat("%-#6.3g mm");

  // Render an image (lights and cameras are created automatically)
  renderWindow->Render();

  renderWindowInteractor->Initialize();
  renderWindow->Render();
  distanceWidget->On();

  // Begin mouse interaction
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt¶

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(DistanceWidget)

find_package(VTK COMPONENTS 
  vtkvtkCommonCore
  vtkvtkInteractionStyle
  vtkvtkInteractionWidgets
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping DistanceWidget: ${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(DistanceWidget MACOSX_BUNDLE DistanceWidget.cxx )
  target_link_libraries(DistanceWidget PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(DistanceWidget MACOSX_BUNDLE DistanceWidget.cxx )
  target_link_libraries(DistanceWidget PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS DistanceWidget
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build DistanceWidget¶

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

cd DistanceWidget/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:

./DistanceWidget

WINDOWS USERS

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