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：
