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59 lines
1.7 KiB
59 lines
1.7 KiB
// Copyright 2019-2021 The Hush developers
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// Released under the GPLv3
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#include "qrcodelabel.h"
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QRCodeLabel::QRCodeLabel(QWidget *parent) :
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QLabel(parent)
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{
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this->setMinimumSize(100, 100);
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setScaledContents(false);
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}
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QSize QRCodeLabel::sizeHint() const
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{
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int w = this->width();
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return QSize(w, w); // 1:1
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}
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void QRCodeLabel::resizeEvent(QResizeEvent*)
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{
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if(!str.isEmpty())
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QLabel::setPixmap(scaledPixmap());
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}
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QPixmap QRCodeLabel::scaledPixmap() const {
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QPixmap pm(size());
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pm.fill(Qt::white);
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QPainter painter(&pm);
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qrcodegen::QrCode qr = qrcodegen::QrCode::encodeText(str.toUtf8().constData(), qrcodegen::QrCode::Ecc::LOW);
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const int s = qr.getSize()>0?qr.getSize():1;
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const double w = pm.width();
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const double h = pm.height();
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const double aspect = w/h;
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const double size = ((aspect>1.0)?h:w);
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const double scale = size/(s+2);
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const double woff = (w - size) > 0 ? (w - size) / 2 : 0;
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const double hoff = (h - size) > 0 ? (h - size) / 2 : 0;
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// NOTE: For performance reasons my implementation only draws the foreground parts
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painter.setPen(Qt::NoPen);
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painter.setBrush(QColor(Qt::black));
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for(int y=0; y<s; y++) {
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for(int x=0; x<s; x++) {
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const int color=qr.getModule(x, y); // 0 for white, 1 for black
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if(0!=color) {
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const double rx1=(x+1)*scale + woff, ry1=(y+1)*scale + hoff;
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QRectF r(rx1, ry1, scale, scale);
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painter.drawRects(&r,1);
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}
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}
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}
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return pm;
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}
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void QRCodeLabel::setQrcodeString(QString stra) {
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str = stra;
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QLabel::setPixmap(scaledPixmap());
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}
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