为什么不将
Graphics2D图形放在（大的）图形中
BufferedImage并在滚动窗格的标签中显示？像这样的东西（动画，5000x5000px）：
import java.awt.*;import java.awt.event.*;import java.awt.image.BufferedImage;import java.util.Random;import javax.swing.*;public class BigScrollImage { BigScrollImage() { final int x = 5000; final int y = 5000; final BufferedImage bi = new BufferedImage(x,y,BufferedImage.TYPE_INT_RGB); Graphics2D g1 = bi.createGraphics(); g1.setColor(Color.BLACK); g1.fillRect(0, 0, x, y); g1.dispose(); final JLabel label = new JLabel(new ImageIcon(bi)); ActionListener listener = new ActionListener() { Random rand = new Random(); @Override public void actionPerformed(ActionEvent ae) { Graphics2D g2 = bi.createGraphics(); int x1 = rand.nextInt(x); int x2 = rand.nextInt(x); int y1 = rand.nextInt(y); int y2 = rand.nextInt(y); int r = rand.nextInt(255); int g = rand.nextInt(255); int b = rand.nextInt(255); g2.setColor(new Color(r,g,b)); g2.drawLine(x1,y1,x2,y2); g2.dispose(); label.repaint(); } }; Timer t = new Timer(5,listener); JScrollPane scroll = new JScrollPane(label); Jframe f = new Jframe("Big Scroll"); f.setDefaultCloseOperation(Jframe.DISPOSE_ON_CLOSE); f.add(scroll); f.pack(); f.setSize(800, 600); f.setLocationByPlatform(true); f.setVisible(true); t.start(); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable(){ @Override public void run() { new BigScrollImage(); } }); }}它试图每秒绘制200线，并且似乎在此处平滑滚动。
