MouseEvents
VTKExamples/Cxx/Interaction/MouseEvents
Description¶
This example shows how to subclass an interactor style to implement custom behaviors.
See MouseEventsObserver for a different approach that uses an existing interactor style class and adds an event observer to it.
Code¶
MouseEvents.cxx
#include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkSphereSource.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkSmartPointer.h> #include <vtkPointPicker.h> #include <vtkCamera.h> #include <vtkInteractorStyleTrackballCamera.h> #include <vtkObjectFactory.h> // Define interaction style class customMouseInteractorStyle : public vtkInteractorStyleTrackballCamera { public: static customMouseInteractorStyle* New(); vtkTypeMacro(customMouseInteractorStyle, vtkInteractorStyleTrackballCamera); virtual void OnLeftButtonDown() { std::cout << "Pressed left mouse button." << std::endl; // Forward events vtkInteractorStyleTrackballCamera::OnLeftButtonDown(); } virtual void OnMiddleButtonDown() { std::cout << "Pressed middle mouse button." << std::endl; // Forward events vtkInteractorStyleTrackballCamera::OnMiddleButtonDown(); } virtual void OnRightButtonDown() { std::cout << "Pressed right mouse button." << std::endl; // Forward events vtkInteractorStyleTrackballCamera::OnRightButtonDown(); } }; vtkStandardNewMacro(customMouseInteractorStyle); int main(int, char *[]) { vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->SetCenter(0.0, 0.0, 0.0); sphereSource->SetRadius(5.0); sphereSource->Update(); vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(sphereSource->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->SetBackground(1,1,1); // Background color white renderer->AddActor(actor); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow ( renderWindow ); vtkSmartPointer<customMouseInteractorStyle> style = vtkSmartPointer<customMouseInteractorStyle>::New(); renderWindowInteractor->SetInteractorStyle( style ); renderWindowInteractor->Initialize(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(MouseEvents) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(MouseEvents MACOSX_BUNDLE MouseEvents.cxx) target_link_libraries(MouseEvents ${VTK_LIBRARIES})
Download and Build MouseEvents¶
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 MouseEvents and its CMakeLists.txt file. Once the tarball MouseEvents.tar has been downloaded and extracted,
cd MouseEvents/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:
./MouseEvents
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.