AngleWidget

VTKExamples/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 simple question about this example contact us at VTKExamplesProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

Code

AngleWidget.cxx

#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderWindow.h>
#include <vtkRenderer.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkAngleWidget.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<vtkAngleWidget> angleWidget = 
    vtkSmartPointer<vtkAngleWidget>::New();
  angleWidget->SetInteractor(renderWindowInteractor);
  angleWidget->CreateDefaultRepresentation();

  // Render
  renderWindow->Render();
  renderWindowInteractor->Initialize();
  renderWindow->Render();
  angleWidget->On();
  renderWindowInteractor->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(AngleWidget)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersSources
  vtkInteractionStyle
  vtkInteractionWidgets
  vtkRenderingCore
  vtkRenderingFreeType
  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 ()
  # include all components
  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.