如何使用文本文件中的数据集在 Java 中绘制折线图? [英] How to plot a Line Graph in Java using dataset from a text file?
本文介绍了如何使用文本文件中的数据集在 Java 中绘制折线图?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我编写了一个 Java GUI 程序，它打开一个文本文件并读取左侧面板中的数据.现在我想在右侧面板上显示从同一文件读取的数据的图形.
我已经使用 JFileChooser 打开文件并读取数据并将它们显示在文本区域上.我希望使用二维 X-Y 图显示从文件中读取的数据.应使用数据文件中指定的标签信息标记图形的轴.X 轴上的值应从指定的 x 轴起始值开始，间隔以由 x 轴间隔值确定的速率递增.Y 轴上的值需要根据数据本身确定.图中绘制的每个点都应使用单线连接.
我使用了几种方法，但都没有奏效.我尝试将文本文件中的每一行作为数组读取，并将数组用作数据集，但效果不佳.请帮我根据文本文件中的数据绘制图表.任何帮助，将不胜感激.谢谢.
P.S 该图应仅使用 AWT/Swing 库绘制.
文件上的数据如下:
标题:年龄对能力的影响Xlabel:年龄Ylabel:能力开始:0间隔:150, 3, 4.2, 7, 5.1, 10, 3.2以下是我迄今为止编写的代码:
import java.awt.BorderLayout;导入 java.awt.Dimension;导入 java.awt.Font;导入 java.awt.GridLayout;导入 java.awt.List;导入 java.awt.TextArea;导入 java.awt.event.ActionEvent;导入 java.awt.event.ActionListener;导入 java.awt.event.KeyEvent;导入 java.awt.event.KeyListener;导入 java.io.BufferedReader;导入 java.io.File;导入 java.io.FileNotFoundException;导入 java.io.FileReader;导入 java.io.IOException;导入 java.io.InputStreamReader;导入 java.math.BigDecimal;导入 java.util.ArrayList;导入 java.util.Scanner;导入 javax.swing.BorderFactory;导入 javax.swing.ImageIcon;导入 javax.swing.JFileChooser;导入 javax.swing.JFrame;导入 javax.swing.JLabel;导入 javax.swing.JMenu;导入 javax.swing.JMenuBar;导入 javax.swing.JMenuItem;导入 javax.swing.JOptionPane;导入 javax.swing.JPanel;导入 javax.swing.JScrollPane;导入 javax.swing.JSplitPane;导入 javax.swing.JTextArea;导入 javax.swing.event.MenuEvent;导入 javax.swing.event.MenuListener;导入 org.jfree.chart.ChartFactory;导入 org.jfree.chart.ChartPanel;导入 org.jfree.chart.JFreeChart;导入 org.jfree.chart.plot.PlotOrientation;导入 org.jfree.data.general.DefaultPieDataset;导入 org.jfree.data.xy.XYSeries；导入 org.jfree.data.xy.XYSeriesCollection;@SuppressWarnings("串行")公共类 GUI 扩展 JFrame {private String[] readLines = new String[6];公共图形用户界面(){//设置标题、大小和布局setTitle("数据可视化工具");setSize(950, 1000);setLayout(new BorderLayout());//为 JFrame 创建一个菜单栏final JMenuBar menuBar = new JMenuBar();//将菜单栏添加到框架中setJMenuBar(menuBar);//定义并添加两个下拉菜单到菜单栏，文件"和帮助"JMenu fileMenu = new JMenu("File");JMenu helpMenu = new JMenu("Help");menuBar.add(fileMenu);menuBar.add(helpMenu);//将菜单项和图标添加到文件"下拉菜单中，final JMenuItem openAction = new JMenuItem("Open", new ImageIcon("images/Open-icon.png"));final JMenuItem saveAction = new JMenuItem("Save", new ImageIcon("images/save-file.png"));final JMenuItem exitAction = new JMenuItem("Exit", new ImageIcon("images/exit-icon.png"));final JMenuItem aboutAction = new JMenuItem("About", new ImageIcon("images/about-us.png"));///////////////////////////////////////////////////////////////////////////////////////////////创建一个文本区域.final JTextArea textArea = new JTextArea("");textArea.setFont(new Font("Serif", Font.BOLD, 16));textArea.setLineWrap(true);textArea.setWrapStyleWord(true);textArea.setEditable(false);JScrollPane textScrollPane = new JScrollPane(textArea);//textArea.add(textScrollPane, BorderLayout.CENTER);//添加//JScrollPane 到面板//滚动条textScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);textScrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);textScrollPane.setPreferredSize(new Dimension(350, 550));textScrollPane.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createTitledBorder("Textual Representation"),BorderFactory.createEmptyBorder(5, 5, 5, 5)));//创建一个图形窗格.JPanel graphicsArea = new JPanel();//graphicsArea.setFont(new Font("Serif", Font.BOLD, 16));JScrollPane graphicsScrollPane = new JScrollPane(graphicsArea);//滚动条graphicsScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);graphicsScrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);graphicsScrollPane.setPreferredSize(new Dimension(550, 550));graphicsScrollPane.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createTitledBorder("图形表示"),BorderFactory.createEmptyBorder(5, 5, 5, 5)));//将图形窗格和文本窗格放在一个拆分窗格中.JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, textScrollPane, graphicsScrollPane);splitPane.setOneTouchExpandable(true);splitPane.setResizeWeight(0.5);JPanel rightPane = new JPanel(new GridLayout(1, 0));rightPane.add(splitPane);//把所有东西放在一起.JPanel leftPane = new JPanel(new BorderLayout());添加(右窗格，BorderLayout.LINE_END)；//////////////////////////////////////////////////////////////////////////////////////////////////////////////文件菜单快捷方式fileMenu.setMnemonic(KeyEvent.VK_F);fileMenu.add(openAction);//openAction.addActionListener(this);openAction.addActionListener(new ActionListener() {公共无效动作执行(ActionEvent arg0){如果 (arg0.getSource().equals(openAction)) {//使用 JFileChooser 打开文本文件JFileChooser fileChooser = new JFileChooser();if (fileChooser.showOpenDialog(fileChooser) == JFileChooser.APPROVE_OPTION) {//fileChooser.setCurrentDirectory(new//File(System.getProperty("user.home")));//环境//当前的//目录文件文件 = fileChooser.getSelectedFile();BufferedReader br = null;尝试 {//FileReader fr = new FileReader(file);扫描仪 f = 新扫描仪(文件)；for (int i = 0; i <6; i++) {readLines[i] = f.nextLine();textArea.setText(textArea.getText() + readLines[i] + "
");String array[] = readLines[i].split(" ");}} catch (FileNotFoundException e) {JOptionPane.showMessageDialog(new JFrame(), "找不到文件！", "错误!",JOptionPane.ERROR_MESSAGE);//错误信息//如果文件不是//成立} catch (NullPointerException e) {//System.out.println(e.getLocalizedMessage());} 最后 {如果(br ！= null){尝试 {br.close();} catch (IOException e) {e.printStackTrace();}}}}}}});fileMenu.add(saveAction);fileMenu.add(exitAction);//退出按钮快捷键exitAction.setMnemonic(KeyEvent.VK_X);exitAction.addActionListener(new ActionListener() {//设置退出按钮公共无效动作执行(ActionEvent arg0){如果 (arg0.getSource().equals(exitAction)) {System.exit(0);}}});fileMenu.addSeparator();helpMenu.addSeparator();helpMenu.add(aboutAction);//关于按钮快捷键aboutAction.setMnemonic(KeyEvent.VK_A);aboutAction.addActionListener(new ActionListener() {//点击关于按钮打开一个对话框，其中包含//关于程序的信息公共无效动作执行(ActionEvent arg0){JOptionPane.showMessageDialog(menuBar.getComponent(0),"该程序基于数据可视化工具的开发.
"+ "基本概念是制作一个读取原始文本数据的软件，
"+ "分析该数据，然后以图形方式将其呈现给用户.","关于我们", JOptionPane.PLAIN_MESSAGE);}});}} 解决方案
从你的例子开始，注意以下几点:
为您的
graphicsArea使用ChartPanel；然后，您的openAction()可以简单地调用setChart().在
creatChart()中解析选中的文件；显示了标题和数据行，但其余属性留作练习.考虑使用
import java.awt.BorderLayout;导入 java.awt.EventQueue;导入 java.awt.Font;导入 java.awt.event.ActionEvent;导入 java.awt.event.ActionListener;导入 java.awt.event.KeyEvent;导入 java.io.BufferedReader;导入 java.io.File;导入 java.io.FileReader;导入 java.io.IOException;导入 javax.swing.BorderFactory;导入 javax.swing.ImageIcon;导入 javax.swing.JFileChooser;导入 javax.swing.JFrame;导入 javax.swing.JMenu;导入 javax.swing.JMenuBar;导入 javax.swing.JMenuItem;导入 javax.swing.JOptionPane;导入 javax.swing.JScrollPane;导入 javax.swing.JSplitPane;导入 javax.swing.JTextArea;导入 org.jfree.chart.ChartFactory;导入 org.jfree.chart.ChartPanel;导入 org.jfree.chart.JFreeChart;导入 org.jfree.data.xy.XYSeries；导入 org.jfree.data.xy.XYSeriesCollection;//* @see https://stackoverflow.com/a/36764715/230513 */公共类 GUI 扩展 JFrame {公共图形用户界面(){super("数据可视化器");setDefaultCloseOperation(EXIT_ON_CLOSE);final JMenuBar menuBar = new JMenuBar();setJMenuBar(menuBar);JMenu fileMenu = new JMenu("File");JMenu helpMenu = new JMenu("Help");menuBar.add(fileMenu);menuBar.add(helpMenu);final JMenuItem openAction = new JMenuItem("Open", new ImageIcon("images/Open-icon.png"));final JMenuItem saveAction = new JMenuItem("Save", new ImageIcon("images/save-file.png"));final JMenuItem exitAction = new JMenuItem("Exit", new ImageIcon("images/exit-icon.png"));final JMenuItem aboutAction = new JMenuItem("About", new ImageIcon("images/about-us.png"));最终 JTextArea textArea = new JTextArea(8, 16);textArea.setFont(new Font("Serif", Font.BOLD, 16));textArea.setLineWrap(true);textArea.setWrapStyleWord(true);textArea.setEditable(false);JScrollPane textScrollPane = new JScrollPane(textArea);textScrollPane.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createTitledBorder("文本表示"),BorderFactory.createEmptyBorder(5, 5, 5, 5)));ChartPanel graphicsArea = new ChartPanel(null);graphicsArea.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createTitledBorder("图形表示"),BorderFactory.createEmptyBorder(5, 5, 5, 5)));JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, textScrollPane, graphicsArea);splitPane.setOneTouchExpandable(true);splitPane.setResizeWeight(0.5);添加(splitPane，BorderLayout.LINE_END)；fileMenu.setMnemonic(KeyEvent.VK_F);fileMenu.add(openAction);openAction.addActionListener(new ActionListener() {@覆盖公共无效动作执行(ActionEvent arg0){如果 (arg0.getSource().equals(openAction)) {JFileChooser fileChooser = new JFileChooser(new File("."));if (fileChooser.showOpenDialog(fileChooser) == JFileChooser.APPROVE_OPTION) {文件文件 = fileChooser.getSelectedFile();graphicsArea.setChart(creatChart(file));}}}私人 JFreeChart creatChart(文件文件){字符串标题 = null;字符串 xAxisLabel = null;字符串 yAxisLabel = null;BufferedReader in = null;int 开始 = 0;整数间隔 = 0;字符串数据 = 空；字符串行 = null;尝试 {in = new BufferedReader(new FileReader(file));while ((line = in.readLine()) != null) {textArea.append(line + " ");if (line.startsWith("Title")) {title = line.split(":")[1].trim();}//在这里解析其他行if (!line.contains(":")) {数据 = 行；}}} catch (IOException ex) {ex.printStackTrace(System.err);}XYSeries 数据集 = new XYSeries(file.getName());for (String s : data.split(",")) {dataset.add(start, Double.valueOf(s));开始 += 间隔；}返回 ChartFactory.createXYLineChart(title,xAxisLabel, yAxisLabel, new XYSeriesCollection(dataset));}});fileMenu.add(saveAction);fileMenu.add(exitAction);exitAction.setMnemonic(KeyEvent.VK_X);exitAction.addActionListener(new ActionListener() {@覆盖公共无效动作执行(ActionEvent arg0){如果 (arg0.getSource().equals(exitAction)) {System.exit(0);}}});fileMenu.addSeparator();helpMenu.addSeparator();helpMenu.add(aboutAction);aboutAction.setMnemonic(KeyEvent.VK_A);aboutAction.addActionListener(new ActionListener() {@覆盖公共无效动作执行(ActionEvent arg0){JOptionPane.showMessageDialog(null,"可视化工具.","关于我们", JOptionPane.PLAIN_MESSAGE);}});盒();setLocationRelativeTo(null);设置可见(真)；}公共静态无效主(字符串 [] args){EventQueue.invokeLater(() -> {新的图形用户界面()；});}}I have written a Java GUI program which opens a text file and reads the data in the left panel. Now I want to display a graph of the data read from the same file on the right panel.
I have used
JFileChooserto open files and read the data and display them on a text area. I want the data read from the file to be displayed using a two dimensional X-Y graph. The axis of the graph should be labeled using the label information specified in the data file. The values on the X-axis should begin from the x-axis start value specified, with intervals which increment at a rate determined by the x-axis interval value. The values on the Y-axis will need to be determined from the data itself. Each point plotted on the graph should be joined using a single line.I have used several methods but none worked. I have tried reading each line on the text file as arrays and use the arrays as the dataset, but it didn't work as well. Please help me plot a graph from the data on the text file. Any help would be appreciated. Thanks.
P.S The graph should be plotted using AWT/Swing libraries only.
The data on the file is as follows:
Title: Effect of Age on Ability Xlabel: Age Ylabel: Ability start: 0 interval: 15 0, 3, 4.2, 7, 5.1, 10, 3.2Following are my code which I have written so far:
import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.Font; import java.awt.GridLayout; import java.awt.List; import java.awt.TextArea; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.io.InputStreamReader; import java.math.BigDecimal; import java.util.ArrayList; import java.util.Scanner; import javax.swing.BorderFactory; import javax.swing.ImageIcon; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JSplitPane; import javax.swing.JTextArea; import javax.swing.event.MenuEvent; import javax.swing.event.MenuListener; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.PlotOrientation; import org.jfree.data.general.DefaultPieDataset; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; @SuppressWarnings("serial") public class GUI extends JFrame { private String[] readLines = new String[6]; public GUI() { // Setting Title, size and layout setTitle("Data Visualiser"); setSize(950, 1000); setLayout(new BorderLayout()); // Creates a menubar for a JFrame final JMenuBar menuBar = new JMenuBar(); // Add the menubar to the frame setJMenuBar(menuBar); // Define and add two drop down menu to the menubar, "file" and "help" JMenu fileMenu = new JMenu("File"); JMenu helpMenu = new JMenu("Help"); menuBar.add(fileMenu); menuBar.add(helpMenu); // adding menu items and icons to the "file" drop down menu, final JMenuItem openAction = new JMenuItem("Open", new ImageIcon("images/Open-icon.png")); final JMenuItem saveAction = new JMenuItem("Save", new ImageIcon("images/save-file.png")); final JMenuItem exitAction = new JMenuItem("Exit", new ImageIcon("images/exit-icon.png")); final JMenuItem aboutAction = new JMenuItem("About", new ImageIcon("images/about-us.png")); ////////////////////////////////////////////////////////////////////////////////////////////// // Create a text area. final JTextArea textArea = new JTextArea(""); textArea.setFont(new Font("Serif", Font.BOLD, 16)); textArea.setLineWrap(true); textArea.setWrapStyleWord(true); textArea.setEditable(false); JScrollPane textScrollPane = new JScrollPane(textArea); // textArea.add(textScrollPane, BorderLayout.CENTER); //add the // JScrollPane to the panel // Scrollbars textScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); textScrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); textScrollPane.setPreferredSize(new Dimension(350, 550)); textScrollPane.setBorder( BorderFactory.createCompoundBorder(BorderFactory.createTitledBorder("Textual Representation"), BorderFactory.createEmptyBorder(5, 5, 5, 5))); // Create an graphics pane. JPanel graphicsArea = new JPanel(); //graphicsArea.setFont(new Font("Serif", Font.BOLD, 16)); JScrollPane graphicsScrollPane = new JScrollPane(graphicsArea); // Scrollbars graphicsScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); graphicsScrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); graphicsScrollPane.setPreferredSize(new Dimension(550, 550)); graphicsScrollPane.setBorder( BorderFactory.createCompoundBorder(BorderFactory.createTitledBorder("Graphical Representation"), BorderFactory.createEmptyBorder(5, 5, 5, 5))); // Put the graphics pane and the text pane in a split pane. JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, textScrollPane, graphicsScrollPane); splitPane.setOneTouchExpandable(true); splitPane.setResizeWeight(0.5); JPanel rightPane = new JPanel(new GridLayout(1, 0)); rightPane.add(splitPane); // Put everything together. JPanel leftPane = new JPanel(new BorderLayout()); add(rightPane, BorderLayout.LINE_END); //////////////////////////////////////////////////////////////////////////////////////////////////////////// // file menu shortcut fileMenu.setMnemonic(KeyEvent.VK_F); fileMenu.add(openAction); // openAction.addActionListener(this); openAction.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { if (arg0.getSource().equals(openAction)) { // using JFileChooser to open the text file JFileChooser fileChooser = new JFileChooser(); if (fileChooser.showOpenDialog(fileChooser) == JFileChooser.APPROVE_OPTION) { // fileChooser.setCurrentDirectory(new // File(System.getProperty("user.home"))); // setting // current // directory File file = fileChooser.getSelectedFile(); BufferedReader br = null; try { // FileReader fr = new FileReader(file); Scanner f = new Scanner(file); for (int i = 0; i < 6; i++) { readLines[i] = f.nextLine(); textArea.setText(textArea.getText() + readLines[i] + " "); String array[] = readLines[i].split(" "); } } catch (FileNotFoundException e) { JOptionPane.showMessageDialog(new JFrame(), "File not found!", "ERROR!", JOptionPane.ERROR_MESSAGE); // error message // if file not // found } catch (NullPointerException e) { // System.out.println(e.getLocalizedMessage()); } finally { if (br != null) { try { br.close(); } catch (IOException e) { e.printStackTrace(); } } } } } } }); fileMenu.add(saveAction); fileMenu.add(exitAction); // exit button shortcut exitAction.setMnemonic(KeyEvent.VK_X); exitAction.addActionListener(new ActionListener() { // setting up exit button public void actionPerformed(ActionEvent arg0) { if (arg0.getSource().equals(exitAction)) { System.exit(0); } } }); fileMenu.addSeparator(); helpMenu.addSeparator(); helpMenu.add(aboutAction); // about button shortcut aboutAction.setMnemonic(KeyEvent.VK_A); aboutAction.addActionListener(new ActionListener() { // clicking on about button opens up a dialog box which contain // information about the program public void actionPerformed(ActionEvent arg0) { JOptionPane.showMessageDialog(menuBar.getComponent(0), "This program is based on the development of a data visualization tool. " + "The basic concept is to produce a piece of software which reads in raw textual data, " + "analyses that data, then presents it graphically to the user.", "About Us", JOptionPane.PLAIN_MESSAGE); } }); } }解决方案Starting from your example, note the following:
Use a
ChartPanelfor yourgraphicsArea; then, youropenAction()can simply invokesetChart().Parse the chosen file in
creatChart(); the title and data lines are shown, but the remaining attributes are left as an exercise.Consider using
Propertiesfor your file format;To change the chart panel's default size, override
getPreferredSize()as shown here.Swing GUI objects should be constructed and manipulated only on the event dispatch thread.
P.S. The graph should be plotted using AWT/Swing libraries only.
For a single chart, replace
ChartPanelwithJPaneland overridepaintComponent()to perform the rendering. You can transform coordinates using the approach is outlined here or here.import java.awt.BorderLayout; import java.awt.EventQueue; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; import javax.swing.BorderFactory; import javax.swing.ImageIcon; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JOptionPane; import javax.swing.JScrollPane; import javax.swing.JSplitPane; import javax.swing.JTextArea; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; //* @see https://stackoverflow.com/a/36764715/230513 */ public class GUI extends JFrame { public GUI() { super("Data Visualiser"); setDefaultCloseOperation(EXIT_ON_CLOSE); final JMenuBar menuBar = new JMenuBar(); setJMenuBar(menuBar); JMenu fileMenu = new JMenu("File"); JMenu helpMenu = new JMenu("Help"); menuBar.add(fileMenu); menuBar.add(helpMenu); final JMenuItem openAction = new JMenuItem("Open", new ImageIcon("images/Open-icon.png")); final JMenuItem saveAction = new JMenuItem("Save", new ImageIcon("images/save-file.png")); final JMenuItem exitAction = new JMenuItem("Exit", new ImageIcon("images/exit-icon.png")); final JMenuItem aboutAction = new JMenuItem("About", new ImageIcon("images/about-us.png")); final JTextArea textArea = new JTextArea(8, 16); textArea.setFont(new Font("Serif", Font.BOLD, 16)); textArea.setLineWrap(true); textArea.setWrapStyleWord(true); textArea.setEditable(false); JScrollPane textScrollPane = new JScrollPane(textArea); textScrollPane.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder("Textual Representation"), BorderFactory.createEmptyBorder(5, 5, 5, 5))); ChartPanel graphicsArea = new ChartPanel(null); graphicsArea.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder("Graphical Representation"), BorderFactory.createEmptyBorder(5, 5, 5, 5))); JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, textScrollPane, graphicsArea); splitPane.setOneTouchExpandable(true); splitPane.setResizeWeight(0.5); add(splitPane, BorderLayout.LINE_END); fileMenu.setMnemonic(KeyEvent.VK_F); fileMenu.add(openAction); openAction.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { if (arg0.getSource().equals(openAction)) { JFileChooser fileChooser = new JFileChooser(new File(".")); if (fileChooser.showOpenDialog(fileChooser) == JFileChooser.APPROVE_OPTION) { File file = fileChooser.getSelectedFile(); graphicsArea.setChart(creatChart(file)); } } } private JFreeChart creatChart(File file) { String title = null; String xAxisLabel = null; String yAxisLabel = null; BufferedReader in = null; int start = 0; int interval = 0; String data = null; String line = null; try { in = new BufferedReader(new FileReader(file)); while ((line = in.readLine()) != null) { textArea.append(line + " "); if (line.startsWith("Title")) { title = line.split(":")[1].trim(); } // parse other lines here if (!line.contains(":")) { data = line; } } } catch (IOException ex) { ex.printStackTrace(System.err); } XYSeries dataset = new XYSeries(file.getName()); for (String s : data.split(",")) { dataset.add(start, Double.valueOf(s)); start += interval; } return ChartFactory.createXYLineChart(title, xAxisLabel, yAxisLabel, new XYSeriesCollection(dataset)); } }); fileMenu.add(saveAction); fileMenu.add(exitAction); exitAction.setMnemonic(KeyEvent.VK_X); exitAction.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { if (arg0.getSource().equals(exitAction)) { System.exit(0); } } }); fileMenu.addSeparator(); helpMenu.addSeparator(); helpMenu.add(aboutAction); aboutAction.setMnemonic(KeyEvent.VK_A); aboutAction.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent arg0) { JOptionPane.showMessageDialog(null, "Visualization tool.", "About Us", JOptionPane.PLAIN_MESSAGE); } }); pack(); setLocationRelativeTo(null); setVisible(true); } public static void main(String[] args) { EventQueue.invokeLater(() -> { new GUI(); }); } }这篇关于如何使用文本文件中的数据集在 Java 中绘制折线图?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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