SphereWidgetEvents
VTKExamples/Cxx/Widgets/SphereWidgetEvents
Description¶
This example shows how to subclass a widget so that events can be further customized.
Contributed by: Alex Malyushytskyy.
Code¶
SphereWidgetEvents.cxx
#include <vtkCallbackCommand.h> #include <vtkCommand.h> #include <vtkObjectFactory.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkSmartPointer.h> #include <vtkSphereWidget.h> #include <vtkSphereRepresentation.h> class MySphereWidget : public vtkSphereWidget { public: static MySphereWidget* New(); vtkTypeMacro(MySphereWidget, vtkSphereWidget); // Handles the events static void ProcessEvents(vtkObject* object, unsigned long event, void* clientdata, void* calldata); protected: MySphereWidget(); // Create a new callback command rather than using the one defined in // vtkSphereWidget. This prevents problems with unexpected behavior due // to the AbortFlag being manipulated. vtkSmartPointer<vtkCallbackCommand> MyEventCallbackCommand; }; MySphereWidget::MySphereWidget() { this->MyEventCallbackCommand = vtkSmartPointer<vtkCallbackCommand>::New(); // Connect our own callback command to our own ProcessEvents function. // This way we do not have to deal with side effects of SphereWidget::ProcessEvents this->MyEventCallbackCommand->SetCallback( MySphereWidget::ProcessEvents ); // Connect our callback function to a few events. this->AddObserver(vtkCommand::StartInteractionEvent, this->MyEventCallbackCommand); this->AddObserver(vtkCommand::InteractionEvent, this->MyEventCallbackCommand); this->AddObserver(vtkCommand::EndInteractionEvent, this->MyEventCallbackCommand); } void MySphereWidget::ProcessEvents( vtkObject *vtkNotUsed(object), unsigned long event, void *vtkNotUsed(clientdata), void *vtkNotUsed(calldata) ) { switch(event) { case vtkCommand::StartInteractionEvent: std::cout << "StartInteractionEvent" << std::endl; break; case vtkCommand::EndInteractionEvent: std::cout << "EndInteractionEvent" << std::endl; break; case vtkCommand::InteractionEvent: std::cout << "InteractionEvent" << std::endl; break; } } vtkStandardNewMacro(MySphereWidget); int main(int, char *[]) { // Create a renderer and render window vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); // Create an interactor vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); vtkSmartPointer<MySphereWidget> sphereWidget = vtkSmartPointer<MySphereWidget>::New(); sphereWidget->SetInteractor(renderWindowInteractor); sphereWidget->SetRepresentationToSurface(); sphereWidget->HandleVisibilityOn(); renderWindow->Render(); renderWindowInteractor->Initialize(); renderWindow->Render(); sphereWidget->On(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR) project(SphereWidgetEvents) find_package(VTK COMPONENTS vtkCommonCore vtkInteractionStyle vtkInteractionWidgets vtkRenderingCore vtkRenderingFreeType vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping SphereWidgetEvents: ${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(SphereWidgetEvents MACOSX_BUNDLE SphereWidgetEvents.cxx ) target_link_libraries(SphereWidgetEvents PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(SphereWidgetEvents MACOSX_BUNDLE SphereWidgetEvents.cxx ) target_link_libraries(SphereWidgetEvents PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS SphereWidgetEvents MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build SphereWidgetEvents¶
Click here to download SphereWidgetEvents and its CMakeLists.txt file. Once the tarball SphereWidgetEvents.tar has been downloaded and extracted,
cd SphereWidgetEvents/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:
./SphereWidgetEvents
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.