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本本提供一个可以动态绘制折线图的接口Graph，该接口只提供了每次加入一个点的方法，其他方法可以在此基础上添加。绘制曲线图等类似。

QT版本：QT5.7或以上

QT5.5或5.6可以按照如下方法部署QtCharts：

1.下载qtcharts

git clone https://github.com/qt/qtcharts.gitgit checkout 5.7

2.配置工程文件

用QT5.6打开qtcharts.pro文件，刚打开时，会显示配置版本，选择Release-64版本。

3.构建项目

构建-构建qtcharts

4.部署项目

项目-运行-添加部署步骤-make-make参数:install-构建-部署qtcharts

参考：

#ifndef GRAPH_H#define GRAPH_H#include 
   
    #include 
    
     #include "QtCharts/QtCharts"using namespace QtCharts;using namespace std;namespace Ui {class Graph;}class Graph : public QWidget{    Q_OBJECTpublic:    explicit Graph(QString title, QWidget *parent = 0);    ~Graph();	void AddPoint(double, int);private:    Ui::Graph *        ui;	QChartView*        _chartView;       //画布	QChart*            _chart;           //画笔	QLineSeries*       _series;          //折线类	QLineSeries*       _preSeries;       //折线类	QValueAxis *       _axisX;           //x轴	QValueAxis *       _axisY;           //y轴	vector
     
           _packageLoss;     //丢包率	QString            _title;           //折线标题};#endif // GRAPH_H
     
    
   

#include "graph.h"#include "ui_graph.h"Graph::Graph(QString title, QWidget *parent) :    QWidget(parent),    ui(new Ui::Graph),	_title(title){    ui->setupUi(this);	_chartView = new QChartView(this);	_chart = new QChart();	_series = NULL;	_preSeries = NULL;	QSize size(800, 400);	_chartView->resize(size);}Graph::~Graph(){    delete ui;}void Graph::AddPoint(double value, int t){	_packageLoss.push_back(value);	if (_preSeries)	{		delete _preSeries;		_preSeries = NULL;	}	_series = new QLineSeries();	_series->setName(_title);	for (int i = 0;i < _packageLoss.size();i++)	{		_series->append(i, _packageLoss[i]);	}	_chart->addSeries(_series);	_chart->createDefaultAxes();	_chart->axisY()->setTitleText("");	_chart->axisX()->setTitleText("sec");	_chartView->setChart(_chart);	_chartView->show();	_preSeries = _series;}

生成样图：