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//! \example tutorial-export-image.cpp
#include <visp3/core/vpConfig.h>
#include <visp3/gui/vpDisplayFactory.h>
#include <visp3/io/vpImageIo.h>
#ifdef ENABLE_VISP_NAMESPACE
using namespace VISP_NAMESPACE_NAME;
#endif
int main()
{
#if defined(VISP_HAVE_DISPLAY)
vpImage<unsigned char> I(240, 320, 255); // Create a black grey level image
vpImage<vpRGBa> Ioverlay;
// Initialize the display with the image I. Display and image are now linked together
#if (VISP_CXX_STANDARD >= VISP_CXX_STANDARD_11)
std::shared_ptr<vpDisplay> d = vpDisplayFactory::createDisplay(I, -1, -1, "Save overlayed image", vpDisplay::SCALE_AUTO);
#else
vpDisplay *d = vpDisplayFactory::allocateDisplay(I, -1, -1, "Save overlayed image", vpDisplay::SCALE_AUTO);
#endif
// Set the display background with image I content
vpDisplay::display(I);
// Draw a red rectangle in the display overlay (foreground)
vpDisplay::displayRectangle(I, 10, 10, 100, 20, vpColor::red, true);
// Flush the foreground and background display
vpDisplay::flush(I);
// Updates the color image with the original loaded image and the overlay
vpDisplay::getImage(I, Ioverlay);
// Write the color image on the disk
std::string ofilename("overlay.png");
std::cout << "Save overlayed image in: " << ofilename << std::endl;
vpImageIo::write(Ioverlay, ofilename);
// Wait for a click in the display window
std::cout << "A click to quit..." << std::endl;
vpDisplay::getClick(I);
#if (VISP_CXX_STANDARD < VISP_CXX_STANDARD_11)
delete d;
#endif
#else
std::cout << "No gui available to display an image..." << std::endl;
#endif
}
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