短视频直播系统，QLinearGradient之画渐变线

短视频直播系统，QLinearGradient之画渐变线实现的相关代码

QLinearGradient linear(m_ptFirst, QPoint(p1x, p1y));
linear.setColorAt(0.0f, QColor(255, 202, 76, 255));
linear.setColorAt(1.0f, QColor(255, 231, 131, 0));
QPen penLine = pen;
penLine.setBrush(QBrush(linear));
pPainter->setPen(penLine);
pPainter->drawLine(m_ptFirst, QPoint(p1x, p1y));

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