1 void MainWindow::readcsvfile() //读取csv
2 { 3 QFile csvFile("C:/Users/Administrator/Desktop/Demo/0702.CSV"); 4 QStringList csvList; 5 csvList.clear(); 6 if (csvFile.open(QIODevice::ReadWrite)) //对csv文件进行读写操作
7 { 8 QTextStream stream(&csvFile); 9 while (!stream.atEnd()) 10 { 11 csvList.push_back(stream.readLine()); //保存到List当中
12 } 13 csvFile.close(); 14 } 15 else
16 { 17 QMessageBox::about(NULL, "csv文件", "未打开该文件！"); 18 } 19 int i = 0; 20 Q_FOREACH(QString str, csvList) //遍历List
21 { 22 i = i + 1; 23 QStringList valsplit = str.split(","); //分隔字符串
24 if(i > 2) 25 { 26 //得到深度、声速、温度
27 QString depth = valsplit[0]; 28 QString sonicvelocity = valsplit[1]; 29 QString temperature = valsplit[2]; 30 double depthvalue = depth.toDouble(); 31 double sonicvalue = sonicvelocity.toDouble(); 32 double tempvalue = temperature.toDouble(); 33 //Q//MessageBox::warning(NULL, "dd", QString::number(tempvalue));
34 QPointF point; 35 point.setX(depthvalue); 36 point.setY(sonicvalue); 37 QPointF point2; 38 point2.setX(depthvalue); 39 point2.setY(tempvalue + 1510); 40 vectors.append(point); 41 vector2.append(point2); 42 } 43 } 44 } 45
46 void MainWindow::lineChart() //绘制图
47 { 48 //设置X,Y标题
49 ui->qwtPlot->setAxisTitle(QwtPlot::xBottom, QString::fromLocal8Bit("深度(m)")); 50 ui->qwtPlot->setAxisTitle(QwtPlot::yLeft, QString::fromLocal8Bit("声速(m/s)")); 51 ui->qwtPlot->setAxisTitle(QwtPlot::yRight, QString::fromLocal8Bit("温度(°C)")); 52 ui->qwtPlot->enableAxis(QwtPlot::yRight,true); 53 ui->qwtPlot->setAxisScale(QwtPlot::yLeft,1538,1540,0.2); 54 ui->qwtPlot->setAxisScale(QwtPlot::xBottom,0,30,2); 55 ui->qwtPlot->setAxisScale(QwtPlot::yRight,28,30,0.2); 56
57 //ui->qwtPlot->set 58 //构造曲线数据
59 QwtPointSeriesData* series = new QwtPointSeriesData(vectors); 60 //设置网格
61 QwtPlotGrid* grid = new QwtPlotGrid(); 62 grid->setPen(QColor(222, 222, 222), 1); 63 grid->attach(ui->qwtPlot); 64 //create plot item
65 QwtPlotCurve* curve1 = new QwtPlotCurve(QString::fromLocal8Bit("声速")); 66 //设置数据
67 curve1->setData(series); 68 //设置画笔颜色==就是图像颜色
69 curve1->setPen(QColor(255, 0, 0), 2, Qt::SolidLine); 70 //使曲线更光滑
71 curve1->setCurveAttribute(QwtPlotCurve::Fitted, true); 72 //把曲线附加到qwtPlot上
73 curve1->attach(ui->qwtPlot); 74 //添加温度-深度曲线 75 //构造曲线数据
76 QwtPointSeriesData* series2 = new QwtPointSeriesData(vector2); 77 //create plot item
78 QwtPlotCurve* curve2 = new QwtPlotCurve(QString::fromLocal8Bit("温度")); 79 //设置数据
80 curve2->setData(series2); 81 //设置画笔颜色=图像颜色
82 curve2->setPen(QColor(127, 222, 335), 2, Qt::SolidLine); 83 //使曲线更光滑
84 curve2->setCurveAttribute(QwtPlotCurve::Fitted, true); 85 //把曲线附加到qwtPlot上
86 curve2->attach(ui->qwtPlot); 87
88 //设置图例
89 QwtLegend *legend = new QwtLegend; 90 legend->setDefaultItemMode(QwtLegendData::ReadOnly); 91 ui->qwtPlot->insertLegend(legend,QwtPlot::BottomLegend);//插入图例
92 ui->qwtPlot->replot(); 93 ui->qwtPlot->show(); 94 }
需要第三方库QWT
运行结果：
