Repository for OpenCV's extra modules
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#include <opencv2/v4d/v4d.hpp>
int main() {
using namespace cv;
using namespace cv::viz;
Ptr<V4D> v4d = V4D::make(Size(1280, 720), "Font Rendering");
v4d->setVisible(true);
//The text to render
string hw = "Hello World";
//Clear with black
v4d->clear();
//Render the text at the center of the screen
v4d->nvg([&](const Size& sz) {
using namespace cv::viz::nvg;
fontSize(40.0f);
fontFace("sans-bold");
fillColor(Scalar(255, 0, 0, 255));
textAlign(NVG_ALIGN_CENTER | NVG_ALIGN_TOP);
text(sz.width / 2.0, sz.height / 2.0, hw.c_str(), hw.c_str() + hw.size());
});
//Display the framebuffer in the native window in an endless loop
v4d->run([=](){ return v4d->display(); });
}