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

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

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