QPainter实现一个温度计,如下图所示:gif如下所示:1.代码实现原理首先实现一个外圆框，效果如下所示:外圆框代码如下所示：void TempUI::drawControlBackColor(QPainter paint) { paint.save(); int dy1 = (height() - _realHeight)/2; paint.translate(width()/2, height() - dy1 -_bootomCircleRadius); paint.setBrush(Qt::white); paint.drawEllipse(QPointF(0, 0), _bootomCircleRadius, _bootomCircleRa