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 }
cv_plot.cpp
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
cv_plot,h
工程结构：
原文地址：https://www.cnblogs.com/YiYA-blog/p/12227306.html
时间： 2024-11-05 11:45:17