QT读取csv文件并且绘制折线图

void MainWindow::readcsvfile() //读取csv
{
 QFile csvFile("C:/Users/Administrator/Desktop/Demo/0702.CSV");
 QStringList csvList;
 csvList.clear();
 if (csvFile.open(QIODevice::ReadWrite)) //对csv文件进行读写操作
 {
  QTextStream stream(&csvFile);
  while (!stream.atEnd())
 {
 csvList.push_back(stream.readLine()); //保存到List当中
 }
 csvFile.close();
 }
 else
 {
	 QMessageBox::about(NULL, "csv文件", "未打开该文件！");
 }
   int i = 0;
   Q_FOREACH(QString str, csvList)   //遍历List
  {
   i = i + 1;
   QStringList valsplit = str.split(","); //分隔字符串
   if(i > 2)
   {
    //得到深度、声速、温度
    QString depth = valsplit[0];
    QString sonicvelocity = valsplit[1];
    QString temperature = valsplit[2];
    double depthvalue = depth.toDouble();
    double sonicvalue = sonicvelocity.toDouble();
    double tempvalue = temperature.toDouble();
	//Q//MessageBox::warning(NULL, "dd", QString::number(tempvalue));
	QPointF point;
    point.setX(depthvalue);
    point.setY(sonicvalue);
	QPointF point2;
	point2.setX(depthvalue);
	point2.setY(tempvalue + 1510);
    vectors.append(point);
	vector2.append(point2);
   }
  }
}

void MainWindow::lineChart() //绘制图
{
    //设置X,Y标题
    ui->qwtPlot->setAxisTitle(QwtPlot::xBottom, QString::fromLocal8Bit("深度(m)"));
    ui->qwtPlot->setAxisTitle(QwtPlot::yLeft, QString::fromLocal8Bit("声速(m/s)"));
    ui->qwtPlot->setAxisTitle(QwtPlot::yRight, QString::fromLocal8Bit("温度(°C)"));
    ui->qwtPlot->enableAxis(QwtPlot::yRight,true);
    ui->qwtPlot->setAxisScale(QwtPlot::yLeft,1538,1540,0.2);
    ui->qwtPlot->setAxisScale(QwtPlot::xBottom,0,30,2);
    ui->qwtPlot->setAxisScale(QwtPlot::yRight,28,30,0.2);

	//ui->qwtPlot->set
    //构造曲线数据
     QwtPointSeriesData* series = new QwtPointSeriesData(vectors);
	 //设置网格
	 QwtPlotGrid* grid = new QwtPlotGrid();
	 grid->setPen(QColor(222, 222, 222), 1);
	 grid->attach(ui->qwtPlot);
	 //create plot item
     QwtPlotCurve* curve1 = new QwtPlotCurve(QString::fromLocal8Bit("声速"));
     //设置数据
	 curve1->setData(series);
	 //设置画笔颜色==就是图像颜色
	 curve1->setPen(QColor(255, 0, 0), 2, Qt::SolidLine);
	 //使曲线更光滑
	 curve1->setCurveAttribute(QwtPlotCurve::Fitted, true);
	 //把曲线附加到qwtPlot上
     curve1->attach(ui->qwtPlot);
     //添加温度-深度曲线
	 //构造曲线数据
	 QwtPointSeriesData* series2 = new QwtPointSeriesData(vector2);
	 //create plot item
	 QwtPlotCurve* curve2 = new QwtPlotCurve(QString::fromLocal8Bit("温度"));
	 //设置数据
	 curve2->setData(series2);
	 //设置画笔颜色=图像颜色
	 curve2->setPen(QColor(127, 222, 335), 2, Qt::SolidLine);
	 //使曲线更光滑
	 curve2->setCurveAttribute(QwtPlotCurve::Fitted, true);
	 //把曲线附加到qwtPlot上
	 curve2->attach(ui->qwtPlot);

	 //设置图例
	 QwtLegend *legend = new QwtLegend;
	 legend->setDefaultItemMode(QwtLegendData::ReadOnly);
	 ui->qwtPlot->insertLegend(legend,QwtPlot::BottomLegend);//插入图例
	 ui->qwtPlot->replot();
     ui->qwtPlot->show();
}

需要第三方库QWT

 

运行结果：