Visual Servoing Platform  version 3.5.1 under development (2022-07-01)
tutorial-event-keyboard.cpp
1 #include <visp3/gui/vpDisplayD3D.h>
3 #include <visp3/gui/vpDisplayGDI.h>
4 #include <visp3/gui/vpDisplayGTK.h>
5 #include <visp3/gui/vpDisplayOpenCV.h>
6 #include <visp3/gui/vpDisplayX.h>
7 
8 int main()
9 {
10  vpImage<unsigned char> I(240, 320); // Create a black image
11 #if defined(VISP_HAVE_X11)
12  vpDisplay *d = new vpDisplayX;
13 #elif defined(VISP_HAVE_GTK)
14  vpDisplay *d = new vpDisplayGTK;
15 #elif defined(VISP_HAVE_GDI)
16  vpDisplay *d = new vpDisplayGDI;
17 #elif defined(VISP_HAVE_D3D9)
18  vpDisplay *d = new vpDisplayD3D;
19 #elif defined(VISP_HAVE_OPENCV)
20  vpDisplay *d = new vpDisplayOpenCV;
21 #else
22  std::cout << "Sorry, no video device is available" << std::endl;
23  return -1;
24 #endif
25  // Initialize the display with the image I. Display and image are
26  // now link together.
27 #ifdef VISP_HAVE_DISPLAY
28  d->init(I);
29 #endif
30  // Set the display background with image I content
32  // Flush the foreground and background display
34  // Wait for keyboard event
35  std::cout << "Waiting a keyboard event..." << std::endl;
37  std::cout << "A keyboard event was detected" << std::endl;
38  // Non blocking keyboard event loop
39  int cpt_event = 0;
40  char key[10];
41  std::cout << "Enter a non blocking keyboard event detection loop..." << std::endl;
42  do {
43  bool event = vpDisplay::getKeyboardEvent(I, &key[0], false);
44  if (event) {
45  std::cout << "Key detected: " << key << std::endl;
46  cpt_event++;
47  }
48  vpTime::wait(5); // wait 5 ms
49  } while (cpt_event < 5);
50 #ifdef VISP_HAVE_DISPLAY
51  delete d;
52 #endif
53 }
Display for windows using Direct3D 3rd party. Thus to enable this class Direct3D should be installed....
Definition: vpDisplayD3D.h:107
Display for windows using GDI (available on any windows 32 platform).
Definition: vpDisplayGDI.h:129
The vpDisplayGTK allows to display image using the GTK 3rd party library. Thus to enable this class G...
Definition: vpDisplayGTK.h:135
The vpDisplayOpenCV allows to display image using the OpenCV library. Thus to enable this class OpenC...
Use the X11 console to display images on unix-like OS. Thus to enable this class X11 should be instal...
Definition: vpDisplayX.h:135
void init(vpImage< unsigned char > &I, int win_x=-1, int win_y=-1, const std::string &win_title="")
Class that defines generic functionnalities for display.
Definition: vpDisplay.h:178
static bool getKeyboardEvent(const vpImage< unsigned char > &I, bool blocking=true)
static void display(const vpImage< unsigned char > &I)
static void flush(const vpImage< unsigned char > &I)
VISP_EXPORT int wait(double t0, double t)