qt qml c++ 画动态折线图

以下为本人原创，如有转载请注明

qt版本5.2 QtQuick2.0  

显示：可横向拖动 ,只需将数据写入数组，折线图可自己按比例生成。端点，最后端点，标度，内部区间阴影，都会自动生成。

源码地址 http://download.csdn.net/detail/zzjzmdx/7113719

源码包包含：main.cpp app.qml linechart.cpp linechart.h 

main.c

int main(int argc, char *argv[])

{

     QGuiApplication app(argc, argv);

    //qmlRegisterType("Charts", 1, 0, "PieChart");

    qmlRegisterType<LineChart>("LineCharts", 1, 0, "LineChart");

    QQuickView view;

    view.setResizeMode(QQuickView::SizeRootObjectToView);

    view.setSource(QUrl("app.qml"));

    view.show();

    return app.exec();

}

linechart.h

class LineChart : public QQuickPaintedItem

{

    Q_OBJECT

public:

    explicit LineChart(QQuickPaintedItem *parent = 0);

    void paint(QPainter *painter);

    Q_PROPERTY(QColor color READ color WRITE setColor)

    QColor color() const;

    void setColor(const QColor &color);

    Q_INVOKABLE void clearChart();

signals:

    void chartCleared();

public slots:

private:

    //QString m_name;

    QColor m_color;

    int monthCount;

    int nameWidth;

    int monthNow;

    int dayNow;

    int topDistance;//上部距离

};

linechart.cpp

void LineChart::paint(QPainter *painter)

{

    QDateTime current_date_time = QDateTime::currentDateTime();

    painter->setRenderHint(QPainter::Antialiasing);//平滑直线

    monthNow= current_date_time.date().month();

    dayNow= current_date_time.date().day();

    if(monthNow==2){

        nameWidth=120*28+2;

        monthCount = 28;

    }else if(monthNow==1||monthNow==3||monthNow==5||monthNow==7

             ||monthNow==8||monthNow==10||monthNow==12){

        nameWidth=120*31+2;

        monthCount = 31;

    }else{

        nameWidth=120*30+2;

        monthCount = 30;

    }

    int i=0;

    int flag=0;

    for(;i<31;i++){

        if(flag 
  
            flag=traffic[i];
 
  
        }
 
  
    }
 
  
    painter->translate(0,530);//设置原点位置
 
  
    QPen penLine(Qt::white,3);
 
  
    painter->setPen(penLine);
 
  
    for (int var = 0; var < dayNow; ++var) {
 
  
        if(var==0){
 
  
            painter->drawLine(0,0,60,-traffic[var]*(530-topDistance)/flag);
 
  
        }else{
 
  
            painter->drawLine((60+(var-1)*120),-traffic[var-1]*(530-topDistance)/flag,120*var+60,-traffic[var]*(530-topDistance)/flag);
 
  
        }
 
  
    }
 
  
 
  
    for (int var = 0; var < dayNow; ++var) {
 
  
        if(var==(dayNow-1)){
 
  
            QPen Endpoint(Qt::white,10);
 
  
            painter->setPen(Endpoint);
 
  
            painter->drawEllipse((60+var*120)-5,(-traffic[var]*(530-topDistance)/flag)-5,10,10);//-5
 
  
        }else{
 
  
            //009955
 
  
//            QPen Endpoint(Qt::white,3);
 
  
//            painter->setPen(Endpoint);
 
  
//            painter->drawEllipse((60+var*120)-5,(-traffic[var]*(530-topDistance)/flag)-5,10,10);//-5
 
  
//            QColor insideBrushColor0(0,153,85,25);
 
  
//            painter->setBrush(insideBrushColor0);
 
  
//            QPen penpoints0(insideBrushColor0,10);
 
  
//            painter->setPen(penpoints0);
 
  
            painter->drawEllipse((60+var*120)-5,(-traffic[var]*(530-topDistance)/flag)-5,10,10);//-5
 
  
        }
 
  
    }
 
  
    QPen Vertical(Qt::white,1);
 
  
    painter->setPen(Vertical);
 
  
    for (int var = 0; var < dayNow; ++var) {
 
  
        painter->drawLine((60+var*120),0,(60+var*120),-traffic[var]*(530-topDistance)/flag+5);
 
  
    }
 
  
    QFont notToday("white",20);
 
  
    painter->setFont(notToday);
 
  
    for (int var = 0; var < dayNow; ++var) {
 
  
        if(var==(dayNow-1)){
 
  
            QFont isToday("white",30);
 
  
            painter->setFont(isToday);
 
  
            QString flagstr="";
 
  
            painter->drawText((60+var*120-60),-traffic[var]*(530-topDistance)/flag-65,"TodayUsed");
 
  
            flagstr = QString::number(traffic[var])+"MB";
 
  
            if(traffic[var]>100){
 
  
                painter->drawText((60+var*120-55),-traffic[var]*(530-topDistance)/flag-25,flagstr);
 
  
            }else{
 
  
                painter->drawText((60+var*120-35),-traffic[var]*(530-topDistance)/flag-25,flagstr);
 
  
            }
 
  
        }else{
 
  
            QString flagstr="";
 
  
            flagstr = QString::number(traffic[var])+"MB";
 
  
            painter->drawText((60+var*120-45),-traffic[var]*(530-topDistance)/flag-25,flagstr);
 
  
        }
 
  
    }
 
  
 
  
    QColor insideBrushColor(255,255,255,25);
 
  
    QPen penpoints(insideBrushColor,0.15);
 
  
    painter->setPen(penpoints);
 
  
    painter->setBrush(insideBrushColor);
 
  
    QPointF points[31];
 
  
    points[0]=QPointF(0.0, 0.0);
 
  
    for (int var = 1; var < dayNow+1; ++var) {
 
  
            float x = (60+(var-1)*120);
 
  
            float y = (-traffic[var-1]*(530-topDistance)/flag);
 
  
            points[var]=QPointF(x, y);
 
  
    }
 
  
    points[dayNow+1]=QPointF(60+(dayNow-1)*120, 0.0);
 
  
    painter->drawConvexPolygon(points,31);
 
  
 
  
}