HoverWidget
VTKExamples/Cxx/Widgets/HoverWidget
Code¶
HoverWidget.cxx
#include <vtkActor.h> #include <vtkCommand.h> #include <vtkHoverWidget.h> #include <vtkPolyDataMapper.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> class vtkHoverCallback : public vtkCommand { public: static vtkHoverCallback *New() { return new vtkHoverCallback; } vtkHoverCallback() {} virtual void Execute(vtkObject*, unsigned long event, void *vtkNotUsed(calldata)) { switch (event) { case vtkCommand::TimerEvent: std::cout << "TimerEvent -> the mouse stopped moving and the widget hovered" << std::endl; break; case vtkCommand::EndInteractionEvent: std::cout << "EndInteractionEvent -> the mouse started to move" << std::endl; break; } } }; int main(int, char *[]) { vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->Update(); // Create a mapper and actor vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(sphereSource->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); // A renderer and render window vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); renderer->AddActor(actor); // An interactor vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); // Create the widget vtkSmartPointer<vtkHoverWidget> hoverWidget = vtkSmartPointer<vtkHoverWidget>::New(); hoverWidget->SetInteractor(renderWindowInteractor); hoverWidget->SetTimerDuration(1000); // Create a callback to listen to the widget's two VTK events vtkSmartPointer<vtkHoverCallback> hoverCallback = vtkSmartPointer<vtkHoverCallback>::New(); hoverWidget->AddObserver(vtkCommand::TimerEvent,hoverCallback); hoverWidget->AddObserver(vtkCommand::EndInteractionEvent,hoverCallback); renderWindow->Render(); renderWindowInteractor->Initialize(); renderWindow->Render(); hoverWidget->On(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(HoverWidget) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(HoverWidget MACOSX_BUNDLE HoverWidget.cxx) target_link_libraries(HoverWidget ${VTK_LIBRARIES})
Download and Build HoverWidget¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download HoverWidget and its CMakeLists.txt file. Once the tarball HoverWidget.tar has been downloaded and extracted,
cd HoverWidget/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:
./HoverWidget
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.