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AngleWidget

vtk-examples/Cxx/Widgets/AngleWidget

Description

Click three points to create an angle. You can then drag the points around.

Other languages

See (Java)

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

AngleWidget.cxx

#include <vtkActor.h>
#include <vtkAngleWidget.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSphereSource.h>

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

  // A renderer and render window
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("AngleWidget");

  // An interactor
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  vtkNew<vtkAngleWidget> angleWidget;
  angleWidget->SetInteractor(renderWindowInteractor);
  angleWidget->CreateDefaultRepresentation();

  // Render
  renderer->SetBackground(colors->GetColor3d("MidnightBlue").GetData());
  renderWindow->Render();
  renderWindowInteractor->Initialize();
  renderWindow->Render();
  angleWidget->On();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(AngleWidget)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersSources
  vtkInteractionStyle
  vtkInteractionWidgets
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  vtkRenderingOpenGL2
  QUIET
)

if (NOT VTK_FOUND)
  message("Skipping AngleWidget: ${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(AngleWidget MACOSX_BUNDLE AngleWidget.cxx )
  target_link_libraries(AngleWidget PRIVATE ${VTK_LIBRARIES})
else()
  # 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(AngleWidget MACOSX_BUNDLE AngleWidget.cxx )
  target_link_libraries(AngleWidget PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS AngleWidget
    MODULES ${VTK_LIBRARIES}
    )
endif()

Download and Build AngleWidget

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

cd AngleWidget/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:

./AngleWidget

WINDOWS USERS

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