[共享]Qt笔记十一:如何实现图片的局部放大？ [复制链接]

void Widget::paintEvent(QPaintEvent *)

{

    QPainter painter(this);

    painter.drawPixmap(0,0,background);

    painter.drawPixmap(x+20,y+20,pixmap);

}

void Widget::mouseMoveEvent(QMouseEvent *event)

{

    x = event->x();

    y = event->y();

    //pixmap.fill(QColor(255,255,255,100));

    mypixmap = mypixmap.grabWidget(this,x,y,10,10);

    width = mypixmap.width();

    height = mypixmap.height();

    pixmap = mypixmap.scaled(width * 5,height * 5，Qt::KeepAspectRatio);         //适应横纵比

    

    

//    QPainter painter(&pixmap);

//    painter.setPen(QColor(255,0,0));

//painter.drawText(20,40,QString("%1").arg(x) + "," + QString("%1").arg(y));

    update();

}