"QR code in QT" Code Answer's
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QR code in QT
#include "QrCode.hpp"
void paintQR(QPainter &painter, const QSize sz, const QString &data, QColor fg)
{
qrcodegen::QrCode qr = qrcodegen::QrCode::encodeText(data.toUtf8().constData(), qrcodegen::QrCode::Ecc::LOW);
const int s=qr.getSize()>0?qr.getSize():1;
const double w=sz.width();
const double h=sz.height();
const double aspect=w/h;
const double size=((aspect>1.0)?h:w);
const double scale=size/(s+2);
painter.setPen(Qt::NoPen);
painter.setBrush(fg);
for(int y=0; y<s; y++) {
for(int x=0; x<s; x++) {
const int color=qr.getModule(x, y); // 0 for white, 1 for black
if(0!=color) {
const double rx1=(x+1)*scale, ry1=(y+1)*scale;
QRectF r(rx1, ry1, scale, scale);
painter.drawRects(&r,1);
}
}
}
}
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