QPainter绘制渐进色文本

参考资料：https://blog.csdn.net/what951006/article/details/52876513

效果图：

 

代码：

void WgtText::paintEvent(QPaintEvent *event)

{

    QPainter painter(this);

    QFont font;

    font.setFamily("Microsoft YaHei");

    // 大小

    font.setPointSize(20);

    // 斜体

    font.setItalic(true);

    // 设置字母大小写

    //font.setCapitalization(QFont::SmallCaps);

    // 设置字符间距

    font.setLetterSpacing(QFont::AbsoluteSpacing, 20);

    // 设置加粗

    //font.setBold(true);

    // 使用字体

    painter.setFont(font);

    QString m_Text1("AAAAAAAAAAAA");

    QString m_Text2("BBBBBBBBBBBB");

    QFontMetrics metrics = painter.fontMetrics();

    int y=((height()-20)/2-metrics.height())/2+20;

    int bottomwidth=width()-metrics.width(m_Text2);

    QLinearGradient m_normalGradient;

   /*

    *frist part

    */

       m_normalGradient.setStart(0, y);

       m_normalGradient.setFinalStop(0, y+metrics.height());

       m_normalGradient.setColorAt(0, QColor(255,0,0));

       m_normalGradient.setColorAt(1, QColor(255,255,0));

       painter.setPen(QPen(m_normalGradient,0));

       painter.drawText(10, y,metrics.width(m_Text1),metrics.height(),Qt::AlignLeft, m_Text1);

   /*

    *second part

   */

       m_normalGradient.setStart(0, y+height()/2);

       m_normalGradient.setFinalStop(0, y+(height()-20)/2+metrics.height());

       m_normalGradient.setColorAt(0, QColor(0,255,0));

       m_normalGradient.setColorAt(1, QColor(0,0,255));

       painter.setPen(QPen(m_normalGradient,0));

       painter.drawText(bottomwidth-10, y+(height()-20)/2,metrics.width(m_Text2),metrics.height(),Qt::AlignLeft, m_Text2);

}