如何使用Qt自定义控件实现圆盘进度条

这篇文章主要介绍如何使用Qt自定义控件实现圆盘进度条，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

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具体内容如下

自定义控件二：圆盘进度条

主要思路：使用qpainter根据图形需求画圆和圆弧，画指针（多边形，指定坐标即可），根据具体的value值旋转坐标系，使指针达到旋转效果，旋转度数是根据value值，总共360度，占比求得。最中间需要画文字上去，每次更新value时调用update（）方法，重绘界面。

主要代码：CMPassrate1.cpp

void CMPassrate1::paintEvent(QPaintEvent *event){ int width = this->width(); int height = this->height(); int side = qMin(width, height); QPainter painter(this); painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing); painter.translate(width / 2, height / 2); painter.scale(side / 200.0, side / 200.0); //绘制外圆 paintSide(&painter); paintOutE(&painter); paintLine(&painter);//绘制刻度线 paintInE(&painter); paintPoint(&painter);//绘制指针 paintTextE(&painter);//绘制文字所在的圆 paintText(&painter);//绘制文字 paintValue(&painter);//绘制value对应的填充角度}void CMPassrate1::paintSide(QPainter *painter){ int radis = outRadis; QRect rect(-radis,-radis,radis*2,radis*2); painter->save(); painter->setBrush(QBrush(QColor("#505050"))); painter->setPen(Qt::NoPen); painter->drawEllipse(rect); painter->restore();}void CMPassrate1::paintOutE(QPainter *painter){ int radis = outRadis-side; QRect rect(-radis,-radis,radis*2,radis*2); painter->save(); painter->setBrush(QBrush(QColor("#868686"))); painter->setPen(Qt::NoPen); painter->drawEllipse(rect); painter->restore();}void CMPassrate1::paintLine(QPainter *painter){ int lineStart = outRadis-3; painter->save(); painter->setPen(QColor("#868686")); int range = 360/12; for(int i = 0;i<12;i++){ painter->rotate(range); painter->drawLine(QPoint(lineStart,0),QPoint(outRadis,0)); } painter->restore();}void CMPassrate1::paintInE(QPainter *painter){ int radis = inRadis; QRect rect(-radis,-radis,radis*2,radis*2); painter->save(); painter->setBrush(QBrush(QColor("#646464"))); painter->setPen(Qt::NoPen); painter->drawEllipse(rect); painter->restore();}void CMPassrate1::paintTextE(QPainter *painter){ int radis = 23; QRect rect(-radis,-radis,radis*2,radis*2); painter->save(); painter->setBrush(QBrush(QColor("#FFFFFF"))); painter->setPen(Qt::NoPen); painter->drawEllipse(rect); painter->restore();}void CMPassrate1::paintPoint(QPainter *painter){ painter->save(); const QPoint points[3] = { QPoint(10,0), QPoint(-10,0), QPoint(0,inRadis-5) }; int range = ((double)value/100)*360; painter->rotate(range); painter->setPen(Qt::NoPen); painter->setBrush(QBrush(QColor("#66CFFF"))); painter->drawConvexPolygon(points,3); painter->restore();}void CMPassrate1::paintText(QPainter *painter){ int radis = 23; QRect rect(-radis,-radis,radis*2,radis*2); painter->save(); painter->setBrush(QBrush(QColor("#000000"))); painter->setPen(QPen(QColor("#000000"))); QFont font = painter->font(); font.setPixelSize(20); painter->setFont(font); painter->drawText(rect,Qt::AlignCenter,QString("%1%").arg(QString::number(value))); painter->restore();}void CMPassrate1::paintValue(QPainter *painter){ int oRandis = outRadis-side; qDebug()<<"value::"<<value; int rangle = ((double)value/100)*360; QRectF rect(-oRandis, -oRandis, oRandis << 1, oRandis << 1); QPainterPath path; qDebug()<<"rangle:"<<rangle<<" start:"<<270-rangle; path.arcTo(rect, 270-rangle, rangle); // QRectF(-120, -120, 240, 240) QPainterPath subPath; subPath.addEllipse(rect.adjusted((oRandis-inRadis),(oRandis-inRadis),-(oRandis-inRadis),-(oRandis-inRadis))); // path为扇形 subPath为椭圆 path -= subPath; painter->save(); painter->setBrush(valueColor); painter->setPen(Qt::NoPen); painter->drawPath(path); painter->restore();}

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