Timer
VTKExamples/Cxx/Utilities/Timer
Description¶
This example demonstrates how to use a timer with an interactor. It outputs a count every specified interval.
Code¶
Timer.cxx
#include <vtkSmartPointer.h> #include <vtkCommand.h> #include <vtkRenderer.h> #include <vtkRendererCollection.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> class vtkTimerCallback : public vtkCommand { public: static vtkTimerCallback *New() { vtkTimerCallback *cb = new vtkTimerCallback; cb->TimerCount = 0; return cb; } virtual void Execute(vtkObject *vtkNotUsed(caller), unsigned long eventId, void *vtkNotUsed(callData)) { if (vtkCommand::TimerEvent == eventId) { ++this->TimerCount; } cout << this->TimerCount << endl; } private: int TimerCount; }; int main(int, char *[]) { // Setup renderer, render window, and interactor vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); interactor->SetRenderWindow(renderWindow); // Initialize must be called prior to creating timer events. interactor->Initialize(); // Sign up to receive TimerEvent vtkSmartPointer<vtkTimerCallback> cb = vtkSmartPointer<vtkTimerCallback>::New(); interactor->AddObserver(vtkCommand::TimerEvent, cb); int timerId = interactor->CreateRepeatingTimer(100); std::cout << "timerId: " << timerId << std::endl; // Start the interaction and timer interactor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(Timer) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(Timer MACOSX_BUNDLE Timer.cxx) target_link_libraries(Timer ${VTK_LIBRARIES})
Download and Build Timer¶
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 Some tarballs may be missing or out-of-date.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 Timer and its CMakeLists.txt file. Once the tarball Timer.tar has been downloaded and extracted,
cd Timer/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:
./Timer
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.