Aditya Kulkarni
6 years ago
5 changed files with 96 additions and 39 deletions
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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(1,1); |
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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 * e) |
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{ |
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if(!address.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(address.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 offset = (w - size) > 0 ? (w - 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+ offset, ry1=(y+1)*scale; |
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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::setAddress(QString addr) { |
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address = addr; |
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QLabel::setPixmap(scaledPixmap()); |
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} |
@ -0,0 +1,23 @@ |
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#ifndef QRCODELABEL_H |
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#define QRCODELABEL_H |
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#include "precompiled.h" |
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class QRCodeLabel : public QLabel |
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{ |
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Q_OBJECT |
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public: |
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explicit QRCodeLabel(QWidget *parent = 0); |
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virtual QSize sizeHint() const; |
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void setAddress(QString address); |
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QPixmap scaledPixmap() const; |
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public slots: |
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void resizeEvent(QResizeEvent *); |
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private: |
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QString address; |
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}; |
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#endif // QRCODELABEL_H
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