研二寒假---关于Qt&CV曲线算法问题
目录
1、单曲线输入和绘图
1、单曲线输入和绘图
1 #include "cv_plot.h" 2 #include "ui_cv_plot.h" 3 #include <QFileDialog> //for getOpenFileName() 4 #include <QDebug> 5 6 CV_Plot::CV_Plot(QWidget *parent) : 7 QWidget(parent), 8 ui(new Ui::CV_Plot) 9 { 10 ui->setupUi(this); 11 12 CV_Plot::GraphSetup(ui->widget); //坐标轴初始化 13 } 14 15 CV_Plot::~CV_Plot() 16 { 17 delete ui; 18 } 19 20 //绘图前的一些设置 21 void CV_Plot::GraphSetup(QCustomPlot* customPlot) 22 { 23 QLinearGradient plotGradient; //QLinearGradient为线性渐变色类 24 plotGradient.setColorAt(1,QColor(50,50,50)); //设置画布颜色 25 26 ui->widget->xAxis->setLabelColor(Qt::black); //x轴文字颜色 27 ui->widget->yAxis->setLabelColor(Qt::black); 28 ui->widget->xAxis->setTickLabelColor(Qt::black); //x轴数字颜色 29 ui->widget->yAxis->setTickLabelColor(Qt::black); 30 ui->widget->xAxis->setBasePen(QPen(Qt::black,2)); //x轴颜色及宽度 31 ui->widget->yAxis->setBasePen(QPen(Qt::black,2)); 32 ui->widget->xAxis->setTickPen(QPen(Qt::black,2)); //主刻度 33 ui->widget->yAxis->setTickPen(QPen(Qt::black,2)); 34 ui->widget->xAxis->setSubTickPen(QPen(Qt::black,2)); //副刻度 35 ui->widget->yAxis->setSubTickPen(QPen(Qt::black,2)); 36 37 ui->widget->xAxis2->setTickLabelColor(Qt::black); //坐标轴2数字颜色 38 ui->widget->yAxis2->setTickLabelColor(Qt::black); 39 ui->widget->xAxis2->setBasePen(QPen(Qt::black, 2)); //坐标轴颜色及宽度 40 ui->widget->yAxis2->setBasePen(QPen(Qt::black, 2)); 41 ui->widget->xAxis2->setTickPen(QPen(Qt::black, 2)); //主刻度 42 ui->widget->yAxis2->setTickPen(QPen(Qt::black, 2)); 43 ui->widget->xAxis2->setSubTickPen(QPen(Qt::black, 2)); //副刻度 44 ui->widget->yAxis2->setSubTickPen(QPen(Qt::black, 2)); 45 46 customPlot->xAxis->setRange(-0.2,0.8); //x轴范围 47 customPlot->yAxis->setRange(-0.0002,0.0002); 48 customPlot->xAxis->setLabel("Potential(V)"); //x轴文字 49 customPlot->yAxis->setLabel("Current(A)"); 50 customPlot->axisRect()->setupFullAxesBox(); //设置句型边框 51 customPlot->xAxis2->setVisible(true); //打开x轴上方的x轴 52 customPlot->xAxis2->setTickLabels(false); //关闭显式刻度 53 customPlot->yAxis2->setVisible(true); //打开坐标轴右方的y轴 54 customPlot->yAxis2->setTickLabels(false); 55 } 56 57 //读取一个txt文本文件按钮槽函数 58 void CV_Plot::on_readFileButton_clicked() 59 { 60 QString fileName = QFileDialog::getOpenFileName(this,tr("Choose a file"),tr("*.txt")); //获取要打开的文件夹名字 61 if(fileName.isEmpty()) 62 QMessageBox::information(this,tr("Information"),"fileName is empty"); //如果fileName为空则弹出一个窗口 63 QFile file(fileName); 64 if(!file.open(QFile::ReadOnly | QFile::Text)) 65 { 66 67 QMessageBox::warning(NULL,"warning","file open failed",QMessageBox::Yes | QMessageBox::No); 68 } 69 QTextStream fileIn(&file); //创建一个文件输入流对象，使fileIn与file绑定 70 71 while(!fileIn.atEnd()) 72 { 73 str.append(fileIn.readLine()); //都txt文件的一行到str中 74 QStringList list = str.split(' '); //以空格分开str 75 double a = list[0].toDouble(); //将string转换为double 76 double b = list[1].toDouble(); 77 xdata.append(a); 78 ydata.append(b); 79 str.clear(); //清空str，并读入下一行 80 } 81 qDebug() << "xdata.size()=" << xdata.size(); 82 if (fileIn.atEnd()) 83 { 84 qDebug() << "End" << endl; 85 file.close(); 86 } 87 for (int i = 0; i < xdata.size()/2; i++) //下曲线数据 88 { 89 xdata1.append(xdata[i]); 90 ydata1.append(ydata[i]); 91 } 92 for (int i = (xdata.size() / 2); i < xdata.size(); i++) //上曲线数据 93 { 94 xdata2.append(xdata[i]); 95 ydata2.append(ydata[i]); 96 } 97 } 98 99 100 //绘图 101 void CV_Plot::GraphShow(QCustomPlot* customPlot) 102 { 103 //设置属性可缩放，移动等 104 ui->widget->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom | QCP::iSelectAxes | 105 QCP::iSelectLegend | QCP::iSelectPlottables); 106 customPlot->addGraph();//添加一条曲线 107 customPlot->graph(0)->setPen(QPen(Qt::blue)); //0是曲线序号，添加的第一条是0，设置曲线颜色 108 customPlot->graph(0)->setData(xdata1, ydata1); //输出各点的图像，x和y都是QVector类 109 110 customPlot->addGraph(); //添加第二条曲线 添加一个曲线图层 111 customPlot->graph(1)->setPen(QPen(Qt::blue)); //1是曲线序号，添加的第二条是1，设置曲线颜色 112 customPlot->graph(1)->setData(xdata2, ydata2); //参数必须为vector类型 113 114 customPlot->replot(); //重新绘图 这一个语句会退出此槽函数 115 } 116 117 118 //绘图按钮槽函数 119 void CV_Plot::on_dataPlotButton_clicked() 120 { 121 CV_Plot::GraphShow(ui->widget); 122 123 }
1 #ifndef CV_PLOT_H 2 #define CV_PLOT_H 3 4 #include <QWidget> 5 #include <QVector> 6 #include "ui_cv_plot.h" 7 #include "qcustomplot.h" 8 9 namespace Ui { 10 class CV_Plot; 11 } 12 13 class CV_Plot : public QWidget 14 { 15 Q_OBJECT 16 17 public: 18 explicit CV_Plot(QWidget *parent = 0); 19 ~CV_Plot(); 20 void GraphShow(QCustomPlot* customPlot); 21 void GraphSetup(QCustomPlot* customPlot); //绘图前的一些设置 22 23 private slots: 24 void on_readFileButton_clicked(); //读取txt文件按钮 25 void on_dataPlotButton_clicked(); //绘图按钮 26 27 private: 28 Ui::CV_Plot *ui; 29 QString str; //保存文本数据 30 QVector<double> xdata; 31 QVector<double> ydata; 32 QVector<double> xdata1; //上曲线数据 33 QVector<double> ydata1; //上曲线数据 34 QVector<double> xdata2; //下曲线数据 35 QVector<double> ydata2; //下曲线数据 36 }; 37 38 #endif // CV_PLOT_H
工程结构：
