自定义Swing组件模型，组件，UI委托

Question

我对java很新，特别是使用Swing。我创建了一个自定义的swing组件，可以使用滑块放大和缩小图片。但是我现在需要这样做，以便我的代码代表三个类
•模型

•UI代表

•用于捆绑模型和UI委托的组件的实现
一起

我很丢失，当我开始将它分成不同的类时，似乎无法让代码正常运行。我在单个类中实现了接口。任何有关如何最好地重新调整此代码以使其适合前面提到的模型的帮助将不胜感激。这是我的代码。

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.event.*;

import java.io.File;
import java.net.URL;

import javax.imageio.ImageIO;

public class CustomComponent extends JComponent implements ChangeListener {

JPanel gui;
JLabel imageCanvas;
Dimension size;
double scale = 1.0;
private BufferedImage image;

public CustomComponent() {
    size = new Dimension(10, 10);
    setBackground(Color.black);
    try {
         image = ImageIO.read(new File("car.jpg"));
    } catch (Exception ex) {
        ex.printStackTrace();
    }
}

public void setImage(Image image) {
    imageCanvas.setIcon(new ImageIcon(image));
}

public void initComponents() {
    if (gui == null) {
        gui = new JPanel(new BorderLayout());
        gui.setBorder(new EmptyBorder(5, 5, 5, 5));
        imageCanvas = new JLabel();
        JPanel imageCenter = new JPanel(new GridBagLayout());
        imageCenter.add(imageCanvas);
        JScrollPane imageScroll = new JScrollPane(imageCenter);
        imageScroll.setPreferredSize(new Dimension(300, 100));
        gui.add(imageScroll, BorderLayout.CENTER);
    }
}

public Container getGui() {
    initComponents();
    return gui;
}

public void stateChanged(ChangeEvent e) {
    int value = ((JSlider) e.getSource()).getValue();
    scale = value / 100.0;
    paintImage();
}

protected void paintImage() {

    int imageWidth = image.getWidth();
    int imageHeight = image.getHeight();
    BufferedImage bi = new BufferedImage(
            (int)(imageWidth*scale), 
            (int)(imageHeight*scale), 
            image.getType());
    Graphics2D g2 = bi.createGraphics();
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
            RenderingHints.VALUE_ANTIALIAS_ON);
    AffineTransform at = AffineTransform.getTranslateInstance(0, 0);
    at.scale(scale, scale);
    g2.drawRenderedImage(image, at);
    setImage(bi);
}

public Dimension getPreferredSize() {
    int w = (int) (scale * size.width);
    int h = (int) (scale * size.height);
    return new Dimension(w, h);
}

private JSlider getControl() {
    JSlider slider = new JSlider(JSlider.HORIZONTAL, 1, 500, 50);
    slider.setMajorTickSpacing(50);
    slider.setMinorTickSpacing(25);
    slider.setPaintTicks(true);
    slider.setPaintLabels(true);
    slider.addChangeListener(this);
    return slider;
}

public static void main(String[] args) {
    CustomComponent app = new CustomComponent();
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setContentPane(app.getGui());
    app.setImage(app.image);

    // frame.getContentPane().add(new JScrollPane(app));  
    frame.getContentPane().add(app.getControl(), "Last");
    frame.setSize(700, 500);
    frame.setLocation(200, 200);
    frame.setVisible(true);
}
}