QCustomPlot封装的股票折线图

简介：QCustomplot 版本2.0，Qt5.5.1(不特定版本)。
功能介绍：
                  1.根据自己的思路简单封装了一下时间轴。
                  2.鼠标移动显示当前时间点对应的股票点数值。
                  3.静态数据模拟显示折线。

                  敬请大家指点，有更好的意见与建议留言。
源码如下：
      【1】pro文件，支持QCustomplot修改：
                         greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport

      【2】股票窗口控件

1.头文件 stockwidget.h
#ifndef STOCKWIDGET_H
#define STOCKWIDGET_H

#include <QWidget>
#include <QTimer>

namespace Ui {
class StockWidget;
}

class StockWidget : public QWidget
{
    Q_OBJECT

public:
    explicit StockWidget(QWidget *parent = 0);
    ~StockWidget();

    // 设置股票plot
    void setupStockPlot();


private slots:
    //模拟实时数据
    void on_pBtn_start_clicked();
    //模拟静态数据
    void on_pBtn_addData_clicked();

    //鼠标移动
    void slot_mouseMove(QMouseEvent* event);

private:
    Ui::StockWidget *ui;
};

#endif // STOCKWIDGET_H

2.源文件stockwidget.cpp
#include "stockwidget.h"
#include "ui_stockwidget.h"

StockWidget::StockWidget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::StockWidget)
{
    ui->setupUi(this);

    setupStockPlot();
}

StockWidget::~StockWidget()
{
    delete ui;
}

void StockWidget::setupStockPlot()
{
    connect(ui->stock_plot, SIGNAL(mouseMove(QMouseEvent*)), this, SLOT(slot_mouseMove(QMouseEvent*)));

    //设置y轴
    QSharedPointer<QCPAxisTickerFixed> fixedTicker(new QCPAxisTickerFixed);
    fixedTicker->setTickCount(3);
    fixedTicker->setTickStepStrategy(QCPAxisTicker::tssReadability);
    fixedTicker->setScaleStrategy(QCPAxisTickerFixed::ssNone);
    ui->stock_plot->yAxis->setRange(3270.5, 3280.5);
    ui->stock_plot->yAxis->setTicker(fixedTicker);
    ui->stock_plot->yAxis->setAntialiased(true);

    //设置x轴
    QSharedPointer<QCPAxisTickerText> textTicker(new QCPAxisTickerText);
    textTicker->setSubTickCount(0);
    textTicker->setTickCount(3);
    textTicker->addTick(5, QObject::tr("09:30"));   //刻度定位5便于刻度标签显示出来。
    textTicker->addTick(120, QObject::tr("11:30"));
    textTicker->addTick(235, QObject::tr("15:00")); //刻度定位235便于刻度标签显示出来。
    ui->stock_plot->xAxis->setTicker(textTicker);

    ui->stock_plot->xAxis->setLabel(QObject::tr("Time"));
    ui->stock_plot->xAxis->setTickLabelColor(QColor(Qt::red));
    ui->stock_plot->xAxis->setRange(QCPRange(0, 240));
    ui->stock_plot->xAxis->grid()->setVisible(false);
    ui->stock_plot->xAxis->setTickLengthIn(0);
    ui->stock_plot->xAxis->setTickPen(QPen(Qt::NoPen));
    ui->stock_plot->xAxis->setAntialiased(true);

    //设置数据折线
    ui->stock_plot->addGraph();
    ui->stock_plot->graph()->setName(QObject::tr("上证指数"));
    ui->stock_plot->graph()->setPen(QPen(Qt::red,2));
    ui->stock_plot->graph()->setAntialiased(true);
    ui->stock_plot->graph()->setAdaptiveSampling(true);
    ui->stock_plot->graph()->setLineStyle(QCPGraph::lsLine);
    ui->stock_plot->graph()->setScatterStyle(QCPScatterStyle::ssNone);

    on_pBtn_addData_clicked();
}

void StockWidget::on_pBtn_start_clicked()
{

}

void StockWidget::on_pBtn_addData_clicked()
{
    QVector<double> value(240);
    QVector<double> key(240);

    int iCount = 240;
    for(int i = 0; i < iCount; ++i){
        value = double(qrand()%100)/10.0 + 3270.0;
        key = i;
    }

    ui->stock_plot->graph()->setData(key, value);
    ui->stock_plot->replot();
}

void StockWidget::slot_mouseMove(QMouseEvent *event)
{
    if(ui->stock_plot->graph()->dataCount() == 0){
        return;
    }

    double dKey;
    double dValue;
    ui->stock_plot->graph()->pixelsToCoords(event->pos(), dKey, dValue);

    QString strdTime;
    QString strValue;

    if(dKey >= 0 && dKey <= 240){

        QDate curDate = QDate::currentDate();
        if(dKey <= 120){
            QDateTime curDayTime(curDate, QTime(9, 30, 0));
            strdTime = curDayTime.addSecs(dKey*60).toString("yyyy.MM.dd, hh:mm");
            strValue = QObject::tr("%1").arg(ui->stock_plot->graph()->dataMainValue(dKey));
        }else{
            //处理此处时注意！11:30之后的数据，索引从1开始的，所以此处-1
            QDateTime curDayTime(curDate, QTime(13, 0, 0));
            strdTime = curDayTime.addSecs((dKey-120)*60).toString("yyyy.MM.dd, hh:mm");
            strValue = QObject::tr("%1").arg(ui->stock_plot->graph()->dataMainValue(dKey-1));
        }
    }else{
        ui->pLb_Msg->setText(QObject::tr("上证指数："));
        return;
    }

    QString showMsg = QObject::tr("上证指数：") + QObject::tr("     时间：%1").arg(strdTime) + QObject::tr("    数据：%1").arg(strValue);
    ui->pLb_Msg->setText(showMsg);
}

3.ui文件(图片没有搞进来，简单介绍)
ui->stock_plot ：拖一个Widget提升为QCustomPlot即可。
ui->pLb_Msg ：显示指数标签。
ui->pBtn_addData：添加数据的按钮。