Qt仿微信,QQ扫一扫功能

 #include <QDesktopWidget> #include <QDebug> #include <QPainter> #include "videsscan.h" #include "ui_videsscan.h" #define VIEWFINDER_WIDTH 260 #define VIEWFINDER_HEIGHT 260 #define GRADUAL_WIDTH 6 #define TRANSPARENCY 200 videSscan::videSscan(QWidget *parent) : QWidget(parent), ui(new Ui::videSscan) { ui->setupUi(this); setStyleSheet("QWidget#videSscan{border-image:url(:/new/prefix1/images/lena.jpg)}"); QPixmap pix = grab(QRect(QPoint(0, 0), this->size())); pix.save("./lena.jpg","JPG"); labelY = (height() - VIEWFINDER_HEIGHT)/2; // setLabelProperty(); connect(&mTimer,&QTimer::timeout,this,&videSscan::scanGradualSlot); mTimer.start(10); } videSscan::~videSscan() { delete ui; } void videSscan::setLabelProperty() { label = new QLabel(this); label->setGeometry((width() - VIEWFINDER_WIDTH)/2,(height() + VIEWFINDER_HEIGHT)/2,VIEWFINDER_WIDTH,GRADUAL_WIDTH); QImage mainimg=QImage(2*VIEWFINDER_WIDTH,GRADUAL_WIDTH,QImage::Format_ARGB32); QPainter painter(&mainimg); painter.setRenderHint(QPainter::Antialiasing, true); // QRadialGradient radialGradient(mainimg.width()/2,mainimg.height()/2,100,mainimg.width()/2,mainimg.height()/2); // radialGradient.setColorAt(0,QColor(105, 164, 53,TRANSPARENCY)); // radialGradient.setColorAt(1,QColor(200, 228, 173,TRANSPARENCY)); // painter.setBrush(radialGradient); painter.setPen(QPen(QColor(105, 164, 53), 1)); painter.setBrush(QBrush(QColor(105, 164, 53))); painter.drawEllipse(0,0,label->width(),5); QPixmap pix = QPixmap::fromImage(mainimg); label->setPixmap(pix); } void videSscan::scanGradualSlot() { label->setGeometry((width() - VIEWFINDER_WIDTH)/2,labelY,VIEWFINDER_WIDTH,GRADUAL_WIDTH); labelY++; if(labelY == (height() + VIEWFINDER_HEIGHT)/2) { labelY = (height() - VIEWFINDER_HEIGHT)/2; } } void videSscan::paintEvent(QPaintEvent *event) { Q_UNUSED(event); QPainter painter(this); painter.setPen(QPen(QColor(127, 194, 65), 6)); //左上 painter.drawLine(QPointF((width() - VIEWFINDER_WIDTH)/2,(height() - VIEWFINDER_HEIGHT)/2), QPointF((width() - VIEWFINDER_WIDTH)/2 + 5,(height() - VIEWFINDER_HEIGHT)/2)); painter.drawLine(QPointF((width() - VIEWFINDER_WIDTH)/2,(height() - VIEWFINDER_HEIGHT)/2), QPointF((width() - VIEWFINDER_WIDTH)/2 ,(height() - VIEWFINDER_HEIGHT)/2 + 5)); //右上 painter.drawLine(QPointF((width()+VIEWFINDER_WIDTH)/2,(height() - VIEWFINDER_HEIGHT)/2), QPointF((width()+VIEWFINDER_WIDTH)/2 - 5,(height() - VIEWFINDER_HEIGHT)/2)); painter.drawLine(QPointF((width()+VIEWFINDER_WIDTH)/2,(height() - VIEWFINDER_HEIGHT)/2), QPointF((width()+VIEWFINDER_WIDTH)/2,(height() - VIEWFINDER_HEIGHT)/2 + 5)); //左下 painter.drawLine(QPointF((width() - VIEWFINDER_WIDTH)/2,(height() + VIEWFINDER_HEIGHT)/2), QPointF((width() - VIEWFINDER_WIDTH)/2 + 5,(height() + VIEWFINDER_HEIGHT)/2)); painter.drawLine(QPointF((width() - VIEWFINDER_WIDTH)/2,(height() + VIEWFINDER_HEIGHT)/2), QPointF((width() - VIEWFINDER_WIDTH)/2 ,(height() + VIEWFINDER_HEIGHT)/2 - 5)); //右下 painter.drawLine(QPointF((width()+VIEWFINDER_WIDTH)/2,(height() + VIEWFINDER_HEIGHT)/2), QPointF((width()+VIEWFINDER_WIDTH)/2 - 5,(height() + VIEWFINDER_HEIGHT)/2)); painter.drawLine(QPointF((width()+VIEWFINDER_WIDTH)/2,(height() + VIEWFINDER_HEIGHT)/2), QPointF((width()+VIEWFINDER_WIDTH)/2,(height() + VIEWFINDER_HEIGHT)/2 - 5)); //画周边阴影 painter.setCompositionMode( QPainter::CompositionMode_Darken ); QColor darkenColor(0, 0, 0, 100); painter.fillRect( 5, 5, width(), (height() - VIEWFINDER_HEIGHT)/2 - 5, darkenColor ); painter.fillRect( 5, (height() - VIEWFINDER_HEIGHT)/2, (width() - VIEWFINDER_WIDTH)/2 - 5, + VIEWFINDER_HEIGHT, darkenColor ); painter.fillRect( (width()+VIEWFINDER_WIDTH)/2, (height() - VIEWFINDER_HEIGHT)/2, (width() - VIEWFINDER_WIDTH)/2 , + VIEWFINDER_HEIGHT, darkenColor); painter.fillRect( 5, (height() + VIEWFINDER_HEIGHT)/2, width() , (height() + VIEWFINDER_HEIGHT)/2, darkenColor); //painter.drawPixmap(0,0,width(),height(),QPixmap("./lena.jpg").scaled(width(),height())); }