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?

查看：124
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

我写了一个Java GUI程序，它打开一个文本文件并在左面板中读取数据。现在我想显示从右侧面板上的相同文件读取的数据图。



我已经使用了 JFileChooser 打开文件并读取数据并将其显示在文本区域中。我希望使用二维X-Y图形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的轴。 X轴上的值应从指定的x轴起始值开始，间隔以x轴间隔值确定的速率递增。 Y轴上的值将需要从数据本身确定。图上绘制的每个点应该用一行代码连接。



我已经使用了几种方法，但都没有成功。我已经尝试将文本文件中的每行读取为数组，并将数组作为数据集使用，但它不起作用。请帮助我从文本文件中的数据绘制图表。任何帮助，将不胜感激。谢谢。



PS该图应该仅使用AWT / Swing库进行绘制。



文件中的数据如下： 

 标题：年龄对技能的影响
 Xlabel：年龄
 Ylabel：技能
 start：0 
 interval：15 
 0,3,4.2,7,5.1,10,3.2

以下是我到目前为止编写的代码： 

  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; 
 
导入org.jfree.chart.ChartFactory; 
导入org.jfree.chart.ChartPanel; 
导入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 {
 $ b $ private String [] readLines = new String [6]; 
 $ b public GUI（）{
 //设置标题，大小和布局
 setTitle（Data Visualiser）; 
 setSize（950，1000）; 
 setLayout（new BorderLayout（））; 
 
 //为JFrame创建菜单栏
 final JMenuBar menuBar = new JMenuBar（）; 
 
 //将菜单栏添加到框架
 setJMenuBar（menuBar）; 
 
 //定义菜单栏并添加两个下拉菜单，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））; 
 $ b $ 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）; //将
 // JScrollPane添加到面板
 
 //滚动条
 textScrollPane.setVerticalScrollBarPolicy（JScrollPane.VERTICAL_SCROLLBAR_​​ALWAYS）; 
 textScrollPane.setHorizo​​ntalScrollBarPolicy（JScrollPane.HORIZONTAL_SCROLLBAR_​​ALWAYS）; 
 
 textScrollPane.setPreferredSize（new Dimension（350，550））; 
 textScrollPane.setBorder（
 BorderFactory.createCompoundBorder（Textual Representation），
 BorderFactory.createEmptyBorder（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.setHorizo​​ntalScrollBarPolicy（JScrollPane.HORIZONTAL_SCROLLBAR_​​ALWAYS）; 
 
 graphicsScrollPane.setPreferredSize（new Dimension（550，550））; 
 graphicsScrollPane.setBorder（
 BorderFactory.createCompoundBorder（图形表示​​法），
 BorderFactory.createEmptyBorder（5，5，5）））; 
 
 //将图形窗格和文本窗格放在拆分窗格中。 
 JSplitPane splitPane =新的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（））; 
 add（rightPane，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（）{
 
 public void actionPerformed（ActionEvent arg0）{
 if（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）））; //设置
 //当前
 //目录
 File file = fileChooser.getSelectedFile（）; 
 BufferedReader br = null; 
 
 try {
 // FileReader fr = new FileReader（file）; 
 Scanner f =新扫描仪（文件）; 
 for（int i = 0;我< 6; i ++）{
 readLines [i] = f.nextLine（）; 
 textArea.setText（textArea.getText（）+ readLines [i] +\\\
）; 
 String array [] = readLines [i] .split（）; 
 
 $ b} catch（FileNotFoundException e）{
 JOptionPane.showMessageDialog（new JFrame（），File not found！，ERROR！，
 JOptionPane 。错误信息）; //错误消息
 //如果文件不是
 //找到
} 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）; 
 
 //退出按钮快捷方式
 exitAction.setMnemonic（KeyEvent.VK_X）; 
 exitAction.addActionListener（new ActionListener（）{
 
 //设置退出按钮
 public void actionPerformed（ActionEvent arg0）{
 if（arg0.getSource（） .equals（exitAction））{
 System.exit（0）; 
} 
} 
}）; 
 
 fileMenu.addSeparator（）; 
 
 helpMenu.addSeparator（）; 
 helpMenu.add（aboutAction）; 
 
 //关于按钮快捷方式
 aboutAction.setMnemonic（KeyEvent.VK_A）; 
 aboutAction.addActionListener（new ActionListener（）{
 
 //点击about按钮打开一个对话框，其中包含
 //有关程序的信息
 public void actionPerformed（ActionEvent arg0）{
 JOptionPane.showMessageDialog（menuBar.getComponent（0），
该程序基于数据可视化工具的开发。\\\

 +基本概念是生成一段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）; 
} 
}）; 
 
 
 $ b


解决方案

从您的示例开始，请注意以下几点：


  • 使用 ChartPanel 为你的 graphicsArea ;那么您的 openAction（）可以简单地调用 setChart（）。


  • 解析 creatChart（）中选定的文件;显示标题和数据行，但剩下的属性留作练习。

    • 考虑使用 

      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; 
    导入org.jfree.chart.ChartFactory; 
    导入org.jfree.chart.ChartPanel; 
    导入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）; 
     $ b $ 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）））; 
     
     ChartPanel graphicsArea = new ChartPanel（null）; 
     graphicsArea.setBorder（BorderFactory.createCompoundBorder（
     BorderFactory.createTitledBorder（Graphical Representation），
     BorderFactory.createEmptyBorder（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 ））{
    如果（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; $ b $ int interval = 0; 
    字符串数据=空; 
     String line = null; 
    尝试{
     in = new BufferedReader（new FileReader（file））; （（line = in.readLine（））！= null）{
     textArea.append（line +\\\
    ）; 
     while 
     if（line.startsWith（Title））{
     title = line.split（：）[1] .trim（）; 
    } 
     //在这里解析其他行
     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; 
    } 
    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（）{
     
     @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。 ，
    关于我们，JOptionPane.PLAIN_MESSAGE）; 
    } 
    }）; 
     pack（）; 
     setLocationRelativeTo（null）; 
     setVisible（true）; 
     
     
     public static void main（String [] args）{
     EventQueue.invokeLater（（） - > {
     new GUI（）; 
    }）; 
    } 
    }


    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 JFileChooser to 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, 3.2

    Following 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] + "\n");
                                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. \n"
                    + "The basic concept is to produce a piece of software which reads in raw textual data, \n"
                    + "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 ChartPanel for your graphicsArea; then, your openAction() can simply invoke setChart().

    • Parse the chosen file in creatChart(); the title and data lines are shown, but the remaining attributes are left as an exercise.

    • Consider using Properties for your file format;

    • For greater flexibility, use Action as shown here.

    • 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 ChartPanel with JPanel and override paintComponent() 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 + "\n");
                        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！

查看全文
相关文章
Java开发最新文章
热门教程
热门工具
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆