java - Swing JFrame 水平滚动条

Question

我正在尝试使用我刚接触的 java swing 制作一个图表。在我的程序中，我从文本文件中获取一些随机数，根据这些随机数创建图表。我已经能够制作图表，但我需要添加一个滚动条才能查看完整的图表，该图表的长度足以适合生成的窗口。任何人都可以修改或建议我一个非常简单的所以

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FontMetrics;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.Stroke;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;

import javax.swing.JFrame;
import javax.swing.SwingUtilities;
 import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.swing.JFrame;

import javax.swing.*; // used to access the JFrame, JPanel, JLabel, and JScrollPane class
import java.awt.*; // used to access the Font class

public class NewLine {
   MyPanel panel;
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI(); 
            }
        });
    }

    private static void createAndShowGUI() {
        System.out.println("Created GUI on EDT? "+
        SwingUtilities.isEventDispatchThread());
        JFrame f = new JFrame("Swing Paint Demo");




 f.setResizable(true);
 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 //panel=new MyPanel();  

        f.add(new MyPanel());
        f.pack();
        f.setVisible(true);
    }
}

class MyPanel extends JPanel {
    private static final Color GRAPH_COLOR = Color.red;
    private static final Color GRID_COLOR = Color.gray;

    public MyPanel() {
        JScrollPane scroll = new JScrollPane(this, ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);
        //JLabel label = new JLabel("This is a JScrollPane Component");

    }

    public Dimension getPreferredSize() {
        return new Dimension(250,200);
    }


    void drawLines(Graphics g) {


        Graphics2D g2d = (Graphics2D) g;

         g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

        g2d.setColor(GRID_COLOR);


         for(int x =20 ; x <=1020; x +=25 ){
         g2d.drawLine(x, 70, x, 500);  // Y AXIS
         }
         for(int y =70 ; y <=500; y +=25 ){
         g2d.drawLine(20, y, 1020, y); // X axis
         }
         g2d.setColor(GRAPH_COLOR);

         int x = 20;

         int diff = 5;
                    try{    
                        FileInputStream fstream = new FileInputStream("data.txt");
                        BufferedReader br = new BufferedReader(new InputStreamReader(fstream));

                        String strLine;

                //Read File Line By Line
                int counter = 0;
                int prevPoint = 0;
                        while ((strLine = br.readLine()) != null)   {
                  // Print the content on the console
                        //x +=5

                        if( counter == 0){
                        System.out.println (strLine);
                        //g2d.drawLine(x, 500-312, x +=15, Integer.parseInt(strLine));
                        }
                        counter ++;
                        g2d.drawLine(x , 500-prevPoint, x +=5, 500-Integer.parseInt(strLine));

                        prevPoint =  Integer.parseInt(strLine);

                }
                //Close the input stream
                        br.close();
                        }
                        catch(Exception ec){}




    }



    public void paint(Graphics g) {
        super.paint(g);
        drawLines(g);
    }
}

文本文件的值如下所示，

360第334章第327章313第312章第302章301294第292章第289章第283章第287章278第282章275第277章274273273268273266273266270第267章第267章....

提前致谢。阿努帕姆。

Answer 1

替换

f.add(new MyPanel());

由

JScrollPane scroll = new JScrollPane(
        new MyPanel(), 
        ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS, 
        ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS
);
f.add(scroll);

并替换这个

public Dimension getPreferredSize() {
    return new Dimension(250,200);
}

按此

public Dimension getPreferredSize() {
    return new Dimension(1020,500);
}

哒哒哒!