通过QT graphicsview实现坐标轴刻度绘制。

void plot::grid(double minx,double maxx,int numticksx,double miny,double maxy,int numticksy,QGraphicsScene *scene){

    //plotsettings settings;

    settings.maxX=maxx;

    settings.minX=minx;

    settings.numticksx=numticksx;

    settings.maxY=maxy;

    settings.minY=miny;

    settings.numticksy=numticksy;

    settings.adjust();

    QPen pen;

    pen.setBrush(QBrush(Qt::gray));//设置笔刷，你可以不用设置

    QVector<<span style=" color:#800080;">qreal> dashes;

    qreal space = 3;

    dashes << 5 << space << 5 <<space;

    pen.setDashPattern(dashes);

    double width=this->viewport()->width();

    double height=this->viewport()->height();

    QRect rect(margin,margin,width-2*margin,height-2*margin);

    for(int i=0;i<<span style=" color:#800000;">settings.numticksx;++i){

        double x=i*rect.width()/settings.numticksx+rect.left();

        double label=settings.minX+i*(settings.maxX-settings.minX)/settings.numticksx;

        scene->addLine(x,rect.bottom(),x,rect.top(),pen);

        QGraphicsTextItem *txtitem = new QGraphicsTextItem();

        txtitem->setPlainText(QString::number(label));

        txtitem->setPos(x,rect.top()-5);

        txtitem->setTransform(QTransform().rotate(-180,Qt::XAxis));

        scene->addItem(txtitem);

    }

    QGraphicsTextItem *txtitem = new QGraphicsTextItem();

    txtitem->setPlainText(QString::number(settings.maxX));

    txtitem->setPos(rect.left()+rect.width(),rect.top()-5);

    txtitem->setTransform(QTransform().rotate(-180,Qt::XAxis));

    scene->addItem(txtitem);

    for(int i=0;i<<span style=" color:#800000;">settings.numticksy;++i){

        double y=rect.top()+i*rect.height()/settings.numticksy;

        scene->addLine(rect.left(),y,rect.right(),y,pen);

        double label=settings.minY+i*(settings.maxY-settings.minY)/settings.numticksy;

        QGraphicsTextItem *txtitem = new QGraphicsTextItem();

        txtitem->setPlainText(QString::number(label));

        txtitem->setPos(rect.left()-35,y+10);

        txtitem->setTransform(QTransform().rotate(-180,Qt::XAxis));

        scene->addItem(txtitem);

    }

    QGraphicsTextItem *txtitemy = new QGraphicsTextItem();

    txtitemy->setPlainText(QString::number(settings.maxY));

    txtitemy->setPos(rect.left()-35,rect.bottom()+10);

    txtitemy->setTransform(QTransform().rotate(-180,Qt::XAxis));

    scene->addItem(txtitemy);

}

  实现效果图：

http://s9/mw690/004iYJMZzy7e1qL9K8E78&690