這篇文章主要介紹Qt自定義控件如何實(shí)現(xiàn)進(jìn)度儀表盤,文中介紹的非常詳細(xì),具有一定的參考價(jià)值,感興趣的小伙伴們一定要看完!
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本文實(shí)例為大家分享了Qt自定義控件實(shí)現(xiàn)進(jìn)度儀表盤的具體代碼,供大家參考,具體內(nèi)容如下
先看效果圖:
思路:外圍的線共100根(自定義,可改變),總共占270度,然后按照 先畫一條線然后旋轉(zhuǎn)坐標(biāo)系的思路畫出完整的線。內(nèi)部即是一個(gè)灰色的背景圓,一個(gè)圓弧和中間的value對(duì)應(yīng)的文字。
關(guān)鍵代碼:CMPassrate2.cpp
void CMPassrate2::paintEvent(QPaintEvent *event){//界面繪制事件 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); drawBGE(&painter); //畫背景圓 drawTextE(&painter);//畫文字所在圓弧 drawText(&painter);//畫文字 drawLines(&painter);//畫最外部的線 } void CMPassrate2::updateValue(float value){//提供給外部的方法,用于更新value this->value = value; update();//每次更新value后,都重繪界面 } void CMPassrate2::drawLines(QPainter* painter){ painter->save(); QPen pen; pen.setColor(QColor("#A7DD42")); pen.setWidth(2); painter->setPen(pen); float range = 270.0/lineCount; //自定義所有的線加起來占270度,100條線 painter->rotate(135);//旋轉(zhuǎn)135度,開始畫線,總共畫270度。 QLine line(QPoint(outLineRadius,0),QPoint(innLineRadius,0)); for(int i = 1;i<=lineCount;i++){ if(i>value){ QPen pen; pen.setColor(QColor("#D7D7D7")); pen.setWidth(2); painter->setPen(pen); } painter->drawLine(line); painter->rotate(range); } painter->restore(); } void CMPassrate2::drawBGE(QPainter* painter){ painter->save(); painter->setPen(Qt::NoPen); painter->setBrush(QColor("#EAEAEA")); QRect rect(-bgERadius,-bgERadius,bgERadius*2,bgERadius*2); painter->drawEllipse(rect); painter->restore(); } void CMPassrate2::drawTextE(QPainter* painter){ painter->save(); painter->setPen(Qt::NoPen); painter->setBrush(QColor("#2DC877")); QPainterPath path; QRect rectOut(-textOutRadius,-textOutRadius,textOutRadius*2,textOutRadius*2); path.arcTo(rectOut,0,360); QPainterPath subPath; QRect rectInn(-textInnRadius,-textInnRadius,textInnRadius*2,textInnRadius*2); subPath.addEllipse(rectInn); path -= subPath; painter->drawPath(path); painter->restore(); } void CMPassrate2::drawText(QPainter* painter){ painter->save(); painter->setPen(QColor("#62A0DB")); QRect rectInn(-textInnRadius,-textInnRadius,textInnRadius*2,textInnRadius*2); QFont font = painter->font(); font.setPixelSize(textSize); painter->setFont(font); painter->drawText(rectInn,Qt::AlignCenter,QString::number(value)); painter->restore(); }
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