Qt 文字描边（基础篇）

项目中有时需要文字描边的功能

1.基础的绘制文字

使用drawtext处理

void MainWindow::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setRenderHint(QPainter::SmoothPixmapTransform, true);
    painter.setRenderHints(QPainter::TextAntialiasing, true);

    QPen pen = painter.pen();

    QString m_textString = "文本God123";

    pen.setWidth(1);
    pen.setColor(QColor(255, 0, 0));
    painter.setPen(pen);
    painter.setBrush(QColor(255, 0, 0));
    //绘制白芯文字，注意文字的位置点设置
    painter.drawText(100,100,m_textString);

}

2.绘制黑边黄字

代码：

void MainWindow::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setRenderHint(QPainter::SmoothPixmapTransform, true);
    painter.setRenderHints(QPainter::TextAntialiasing, true);

    QPen pen = painter.pen();

    QString m_textString = "文本God123";

    QPainterPath path;
    //注意文字的位置点设置
    path.addText(100,200,painter.font(), m_textString);

    pen.setWidth(2);
    pen.setColor(QColor(0, 0, 0));
    painter.setPen(pen);
    //
    painter.setBrush(QColor(255, 255, 0));
    //绘制黑边
    painter.drawPath(path);


}

3.只绘制黑边

void MainWindow::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setRenderHint(QPainter::SmoothPixmapTransform, true);
    painter.setRenderHints(QPainter::TextAntialiasing, true);

    QPen pen = painter.pen();

    QString m_textString = "文本God123";

    QPainterPath path;
    //注意文字的位置点设置
    path.addText(100,200,painter.font(), m_textString);

    pen.setWidth(2);
    pen.setColor(QColor(0, 0, 0));
    painter.setPen(pen);
    //
    //painter.setBrush(QColor(255, 255, 0));
    //绘制黑边
    painter.drawPath(path);
}

4.绘制黑边红字（另一种方法）

void MainWindow::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setRenderHint(QPainter::SmoothPixmapTransform, true);
    painter.setRenderHints(QPainter::TextAntialiasing, true);

    QPen pen = painter.pen();

    QString m_textString = "文本God123";

    QPainterPath path;
    //注意文字的位置点设置
    path.addText(100,200,painter.font(), m_textString);

    pen.setWidth(2);
    pen.setColor(QColor(0, 0, 0));
    painter.setPen(pen);
    //
    //painter.setBrush(QColor(255, 255, 0));
    //绘制黑边
    painter.drawPath(path);

    pen.setWidth(1);
    pen.setColor(QColor(255, 0, 0));
    painter.setPen(pen);
    painter.setBrush(QColor(255, 0, 0));
    //绘制白芯文字，注意文字的位置点设置
    painter.drawText(100,200,m_textString);
}