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//! \example tutorial-event-keyboard.cpp
#include <visp3/gui/vpDisplayD3D.h>
#include <visp3/gui/vpDisplayGDI.h>
#include <visp3/gui/vpDisplayGTK.h>
#include <visp3/gui/vpDisplayOpenCV.h>
#include <visp3/gui/vpDisplayX.h>
int main()
{
vpImage<unsigned char> I(240, 320); // Create a black image
#if defined(VISP_HAVE_X11)
vpDisplay *d = new vpDisplayX;
#elif defined(VISP_HAVE_GTK)
vpDisplay *d = new vpDisplayGTK;
#elif defined(VISP_HAVE_GDI)
vpDisplay *d = new vpDisplayGDI;
#elif defined(VISP_HAVE_D3D9)
vpDisplay *d = new vpDisplayD3D;
#elif defined(HAVE_OPENCV_HIGHGUI)
vpDisplay *d = new vpDisplayOpenCV;
#else
std::cout << "Sorry, no video device is available" << std::endl;
return EXIT_FAILURE;
#endif
// Initialize the display with the image I. Display and image are
// now link together.
#ifdef VISP_HAVE_DISPLAY
d->init(I);
#endif
// Set the display background with image I content
vpDisplay::display(I);
// Flush the foreground and background display
vpDisplay::flush(I);
// Wait for keyboard event
std::cout << "Waiting a keyboard event..." << std::endl;
vpDisplay::getKeyboardEvent(I, true);
std::cout << "A keyboard event was detected" << std::endl;
// Non blocking keyboard event loop
int cpt_event = 0;
char key[10];
std::cout << "Enter a non blocking keyboard event detection loop..." << std::endl;
do {
bool event = vpDisplay::getKeyboardEvent(I, &key[0], false);
if (event) {
std::cout << "Key detected: " << key << std::endl;
cpt_event++;
}
vpTime::wait(5); // wait 5 ms
} while (cpt_event < 5);
#ifdef VISP_HAVE_DISPLAY
delete d;
#endif
}
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