VTK/Examples/Cxx/Utilities/Timer
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Jump to navigationJump to searchThis example demonstrates how to use a timer with an interactor. It outputs a count every specified interval.
Contents
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;
}
Please try the new VTKExamples website.
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)
if(VTK_LIBRARIES)
target_link_libraries(Timer ${VTK_LIBRARIES})
else()
target_link_libraries(Timer vtkHybrid vtkWidgets)
endif()
Download and Build Timer
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.
Maybe display the count using a vtkTextActor?