Qt绘制文字

void Widget::paintEvent(QPaintEvent *event)
{
    
    QPainter painter(this);
    QRectF rect(10.0,10.0,380.0,280.0);
    painter.setPen(Qt::red);
    painter.drawRect(rect);
    painter.setPen(Qt::blue);
    //参数：绘制文字所在的矩形、文字在矩形中的对齐方式、绘制的文字\n能实现换行
    painter.drawText(rect,Qt::AlignHCenter,tr("AlignHCenter"));
    painter.drawText(rect,Qt::AlignLeft,tr("AlignLeft"));
    painter.drawText(rect,Qt::AlignRight,tr("AlignRight"));
    painter.drawText(rect,Qt::AlignHCenter,tr("AlignHCenter"));
    painter.drawText(rect,Qt::AlignBottom,tr("AlignBottom"));
    painter.drawText(rect,Qt::AlignCenter,tr("AlignCenter"));
    painter.drawText(rect,Qt::AlignBottom | Qt::AlignBottom,tr("AlignBottom/AlignBottom"));

    //参数：字体的family属性、大小、是否是用粗体、是否使用斜体
    QFont font("宋体",15,QFont::Bold,true);
    //设置下划线
    font.setOverline(true);
    //设置字母大小写
    font.setCapitalization(QFont::SmallCaps);
    //设置字符间的间距
    font.setLetterSpacing(QFont::AbsoluteSpacing,10);
    //使用字体
    painter.setFont(font);
    painter.setPen(Qt::red);
    painter.drawText(120,80,tr("Hello world!"));
    painter.translate(100,100);
    painter.rotate(90);
    painter.drawText(0,0,tr("Hello Qt!"));
}