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Qt自定义控件实现多彩色仪表盘

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本文实例为大家分享了Qt实现多彩色仪表盘的具体代码,供大家参考,具体内容如下 。

Qt自定义控件4:多彩色仪表盘 。

先看效果图:

Qt自定义控件实现多彩色仪表盘

思路:外围三色的圆弧 红:蓝:绿 = 1:2:1,总共占270度。刻度线是根据所在圆弧的颜色而画,刻度线的角度也是根据坐标系的旋转而画。刻度值是根据刻度线的角度得到所要画的刻度的左上角的坐标,然后构成一个矩形,根据矩形画出刻度值。指针是根据四个点的坐标直接画的四边形,再旋转坐标系实现指针旋转的效果。下方的文字直接得到坐标横纵坐标位置得到矩形画出value的值 。

关键代码:CMPassrate3.cpp 。

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void CMPassrate3::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);
   drawBG(&painter);
   drawE(&painter);
   drawLine(&painter);
   drawText(&painter);
   drawBootomText(&painter);
   drawPoint(&painter);
}
 
void CMPassrate3::drawE(QPainter* painter){
   painter->setPen(Qt::NoPen);
   QRect rectOut(-outRadius,-outRadius,2*outRadius,2*outRadius);
   QRect rectInn(-innRadius,-innRadius,2*innRadius,2*innRadius);
   painter->save();
   painter->setBrush(QColor( "#04EEB2" ));
   QPainterPath path;
   path.arcTo(rectOut,-45,270.0/4);
 
   QPainterPath subPath;
   subPath.addEllipse(rectInn);
   path -= subPath;
   painter->drawPath(path);
   painter->restore();
 
   painter->save();
   QPainterPath bluePath;
   QPainterPath blueSubPath;
   painter->setBrush(QColor( "#2DC5F6" ));
   bluePath.arcTo(rectOut,-45+(270.0/4),270.0/2);
 
   blueSubPath.addEllipse(rectInn);
   bluePath -= blueSubPath;
   painter->drawPath(bluePath);
   painter->restore();
 
   painter->save();
   QPainterPath redPath;
   QPainterPath redSubPath;
   painter->setBrush(QColor( "#FA468C" ));
   redPath.arcTo(rectOut,-45+270.0*3/4,270.0/4);
 
   redSubPath.addEllipse(rectInn);
   redPath -= redSubPath;
   painter->drawPath(redPath);
   painter->restore();
}
 
void CMPassrate3::drawLine(QPainter* painter){
   painter->save();
   painter->rotate(135);
   //270/8度一格
   for ( int i = 0;i<9;i++){
     if (i<3){
       painter->setPen(QColor( "#FA468C" ));
     } else if (i<6){
       painter->setPen(QColor( "#2DC5F6" ));
     } else {
       painter->setPen(QColor( "#04EEB2" ));
     }
     QLine line(QPoint(lineStart,0),QPoint(innRadius,0));
     painter->drawLine(line);
     painter->rotate(270.0/8);
   }
   painter->restore();
}
 
void CMPassrate3::drawPoint(QPainter* painter){
   const QPoint point[4]{
     QPoint(0,0),QPoint(0,6),QPoint((lineStart-3)*qCos(135*3.14/180),(lineStart-3)*qSin(135*3.14/180)),QPoint(-6,0)
   };
   float range = 270.0/100*value;
   painter->save();
   painter->setBrush(QColor( "#C2E481" ));
   painter->rotate(range);
   painter->drawConvexPolygon(point,4);
   painter->restore();
}
 
void CMPassrate3::drawBG(QPainter* painter){ //可以自行添加背景图片实现更加精美的效果
//  painter->save();
//  QImage image(":/image/images/bg1.jpg");
//  QRect rect(-this->width(),-this->height(),this->width()*2,this->height()*2);
//  painter->drawImage(rect,image);
//  painter->restore();
 
}
 
void CMPassrate3::drawText(QPainter *painter){
   painter->save();
   //初始为
   painter->setPen(Qt::black);
   QFont font = painter->font();
   font.setPixelSize(8);
   painter->setFont(font);
   float x,y;
   for ( float i =0;i<=100;i+=12.5){
     x = lineStart*qCos((135+(270.0/8)*((i+1)/12.5))*3.14/180);
     y = lineStart*qSin((135+(270.0/8)*((i+1)/12.5))*3.14/180);
     QRect rect;
     if (i<50){
       rect.setX(x);
       rect.setY(y);
     } else if (i>50){
       rect.setX(x-17);
       rect.setY(y-7);
     } else {
       rect.setX(x);
       rect.setY(y);
     }
     rect.setWidth(17);
     rect.setHeight(10);
     painter->drawText(rect,Qt::AlignCenter,QString::number(i));
   }
 
 
   painter->restore();
}
 
void CMPassrate3::drawBootomText(QPainter *painter){
   painter->save();
   painter->setPen(Qt::black);
   QFont font = painter->font();
   font.setPixelSize(25);
   painter->setFont(font);
   painter->translate(0,outRadius-12);
   int length = 20;
   QRect rect(-length,-length,length*2,length*2);
   painter->drawText(rect,Qt::AlignCenter,QString::number(value));
   painter->restore();
}

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原文链接:https://blog.csdn.net/parkchorong/article/details/102539008 。

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