Java Jpanel重新绘制时调整大小

我在下面的代码中执行缩放操作。表单中的两个滑块是缩放仿射变换的X和Y参数。我在这里的问题是，当我更改滑块时，图像正在缩放，如何动态调整绘制图像的jpanel的大小

/*
     * To change this template, choose Tools | Templates
     * and open the template in the editor.
     */
    package newpackage;

    import java.awt.Graphics;
    import java.awt.Image;
    import java.awt.geom.AffineTransform;
    import java.awt.image.AffineTransformOp;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.util.logging.Level;
    import java.util.logging.Logger;
    import javax.imageio.ImageIO;

    /**
     *
     * @author ABC
     */
    public class Swon extends javax.swing.JFrame {

        final BufferedImage img;
        /**
         * Creates new form Swon
         */
        public Swon() throws IOException{
           BufferedImage im=ImageIO.read(new File("C:/Users/ABC/Desktop/I-RIX2012_Final_logo_out.jpg"));
           this.img=new BufferedImage(im.getWidth(),im.getWidth(),BufferedImage.TYPE_BYTE_GRAY);
           this.img.getGraphics().drawImage(im, 0, 0, null);
            initComponents();
        }

        /**
         * This method is called from within the constructor to initialize the form.
         * WARNING: Do NOT modify this code. The content of this method is always
         * regenerated by the Form Editor.
         */
        @SuppressWarnings("unchecked")
        // <editor-fold defaultstate="collapsed" desc="Generated Code">
        private void initComponents() {

            jPanel1 = new javax.swing.JPanel(){

                // @Override

                //    public void paint(Graphics g)
                //    {
                    //        super.paint(g);
                    //        g.drawImage(img.getScaledInstance(this.getWidth(), this.getHeight(), Image.SCALE_FAST),0,0,null);
                    //    }

            };
            jSlider1 = new javax.swing.JSlider();
            jSlider2 = new javax.swing.JSlider();

            setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

            jPanel1.setBorder(new javax.swing.border.SoftBevelBorder(javax.swing.border.BevelBorder.RAISED));
            jPanel1.addComponentListener(new java.awt.event.ComponentAdapter() {
                public void componentResized(java.awt.event.ComponentEvent evt) {
                    jPanel1ComponentResized(evt);
                }
            });

            javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
            jPanel1.setLayout(jPanel1Layout);
            jPanel1Layout.setHorizontalGroup(
                jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGap(0, 268, Short.MAX_VALUE)
            );
            jPanel1Layout.setVerticalGroup(
                jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGap(0, 209, Short.MAX_VALUE)
            );

            jSlider1.setMaximum(5);
            jSlider1.setValue(1);
            jSlider1.addChangeListener(new javax.swing.event.ChangeListener() {
                public void stateChanged(javax.swing.event.ChangeEvent evt) {
                    jSlider1StateChanged(evt);
                }
            });

            jSlider2.setMaximum(5);
            jSlider2.setValue(1);
            jSlider2.addChangeListener(new javax.swing.event.ChangeListener() {
                public void stateChanged(javax.swing.event.ChangeEvent evt) {
                    jSlider2StateChanged(evt);
                }
            });

            javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
            getContentPane().setLayout(layout);
            layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGap(45, 45, 45)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                        .addComponent(jSlider2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jSlider1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                    .addContainerGap(242, Short.MAX_VALUE))
            );
            layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addGap(36, 36, 36)
                    .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGap(33, 33, 33)
                    .addComponent(jSlider1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                    .addComponent(jSlider2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addContainerGap(38, Short.MAX_VALUE))
            );

            pack();
        }// </editor-fold>

        private void jPanel1ComponentResized(java.awt.event.ComponentEvent evt) {
            // TODO add your handling code here:
          //  AffineTransform f=new AffineTransform();

        }

        private void jSlider1StateChanged(javax.swing.event.ChangeEvent evt) {
            // TODO add your handling code here:

                        AffineTransform scale = AffineTransform.getScaleInstance(jSlider1.getValue(),jSlider2.getValue());       
                    AffineTransformOp op3 = new AffineTransformOp(scale, AffineTransformOp.TYPE_BILINEAR);
                    BufferedImage scaling = new BufferedImage(this.img.getHeight(), this.img.getWidth(), this.img.getType());
                    BufferedImage img1=op3.filter(this.img, scaling);
                    jPanel1.getGraphics().drawImage(img1.getScaledInstance(jPanel1.getWidth(), jPanel1.getHeight(), Image.SCALE_FAST), 0, 0, null);
        }

        private void jSlider2StateChanged(javax.swing.event.ChangeEvent evt) {
            // TODO add your handling code here:
             AffineTransform scale = AffineTransform.getScaleInstance(jSlider1.getValue(),jSlider2.getValue());       
                    AffineTransformOp op3 = new AffineTransformOp(scale, AffineTransformOp.TYPE_BILINEAR);
                    BufferedImage scaling = new BufferedImage(this.img.getHeight(), this.img.getWidth(), this.img.getType());
                    BufferedImage img1=op3.filter(this.img, scaling);
                    jPanel1.getGraphics().drawImage(img1.getScaledInstance(jPanel1.getWidth(), jPanel1.getHeight(), Image.SCALE_FAST), 0, 0, null);
        }

        /**
         * @param args the command line arguments
         */
        public static void main(String args[]) {
            /* Set the Nimbus look and feel */
            //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
            /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
             * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
             */
            try {
                for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                    if ("Nimbus".equals(info.getName())) {
                        javax.swing.UIManager.setLookAndFeel(info.getClassName());
                        break;
                    }
                }
            } catch (ClassNotFoundException ex) {
                java.util.logging.Logger.getLogger(Swon.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
            } catch (InstantiationException ex) {
                java.util.logging.Logger.getLogger(Swon.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
            } catch (IllegalAccessException ex) {
                java.util.logging.Logger.getLogger(Swon.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
            } catch (javax.swing.UnsupportedLookAndFeelException ex) {
                java.util.logging.Logger.getLogger(Swon.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
            }
            //</editor-fold>

            /* Create and display the form */
            java.awt.EventQueue.invokeLater(new Runnable() {
                public void run() {
                    try {
                        new Swon().setVisible(true);
                    } catch (IOException ex) {
                        Logger.getLogger(Swon.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
            });
        }
        // Variables declaration - do not modify
        public javax.swing.JPanel jPanel1;
        private javax.swing.JSlider jSlider1;
        private javax.swing.JSlider jSlider2;
        // End of variables declaration
    }

/*
*要更改此模板，请选择工具|模板
*然后在编辑器中打开模板。
*/
包装新包装；
导入java.awt.Graphics；
导入java.awt.Image；
导入java.awt.geom.AffineTransform；
导入java.awt.image.AffineTransformOp；
导入java.awt.image.buffereImage；
导入java.io.File；
导入java.io.IOException；
导入java.util.logging.Level；
导入java.util.logging.Logger；
导入javax.imageio.imageio；
/**
*
*@author-ABC
*/
公共类Swon扩展了javax.swing.JFrame{
最终缓冲图像img；
/**
*创建新形式Swon
*/
公共Swon（）抛出IOException{
BuffereImage im=ImageIO.read（新文件（“C:/Users/ABC/Desktop/I-RIX2012_Final_logo_out.jpg”）；
this.img=new BufferedImage（im.getWidth（），im.getWidth（），BufferedImage.TYPE_BYTE_GRAY）；
this.img.getGraphics（）.drawImage（im，0，0，null）；
初始化组件（）；
}
/**
*从构造函数中调用此方法来初始化表单。
*警告：不要修改此代码。此方法的内容始终为
*由表单编辑器重新生成。
*/
@抑制警告（“未选中”）
// 
私有组件（）{
jPanel1=newjavax.swing.JPanel（）{
//@覆盖
//公共空间涂料（图g）
//    {
//超级油漆（g）；
//g.drawImage（img.getScaledInstance（this.getWidth（），this.getHeight（），Image.SCALE\u FAST），0,0，null）；
//    }
};
jSlider1=newjavax.swing.JSlider（）；
jSlider2=newjavax.swing.JSlider（）；
setDefaultCloseOperation（javax.swing.WindowConstants.EXIT_ON_CLOSE）；
setboorder（newjavax.swing.border.SoftBevelOrder（javax.swing.border.BevelOrder.RAISED））；
addComponentListener（新java.awt.event.ComponentAdapter（）{
public void ComponentResistized（java.awt.event.ComponentEvent evt）{
JPANEL1元件电阻化（evt）；
}
});
javax.swing.GroupLayout jPanel1Layout=新的javax.swing.GroupLayout（jPanel1）；
setLayout（jPanel1Layout）；
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGap（0，268，短。最大值）
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGap（0，209，短.MAX_值）
);
jSlider1.setMaximum（5）；
jSlider1.setValue（1）；
jSlider1.addChangeListener（新的javax.swing.event.ChangeListener（）{
public void stateChanged（javax.swing.event.ChangeEvent evt）{
jSlider1StateChanged（evt）；
}
});
jSlider2.setMaximum（5）；
jSlider2.setValue（1）；
jSlider2.addChangeListener（新的javax.swing.event.ChangeListener（）{
public void stateChanged（javax.swing.event.ChangeEvent evt）{
jSlider2StateChanged（evt）；
}
});
javax.swing.GroupLayout=newjavax.swing.GroupLayout（getContentPane（））；
getContentPane（）.setLayout（布局）；
layout.setHorizontalGroup(
createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（layout.createSequentialGroup（）
.addGap（45,45,45）
.addGroup（layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addComponent（jSlider2，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addComponent（jSlider1，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addComponent（jPanel1，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，Short.MAX\u VALUE））
.addContainerGap（242，简称最大值））
);
layout.setVerticalGroup(
createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（layout.createSequentialGroup（）
.addGap（36,36,36）
.addComponent（jPanel1，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，Short.MAX\u值）
.addGap（33,33,33）
.addComponent（jSlider1，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addPreferredGap（javax.swing.LayoutStyle.ComponentPlacement.UNRELATED）
.addComponent（jSlider2，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addContainerGap（38，简称最大值））
);
包装（）；
}// 
私有void JPanel1ComponentResistized（java.awt.event.ComponentEvent evt）{
//TODO在此处添加您的处理代码：
//AffineTransform f=新的AffineTransform（）；
}
私有void jSlider1StateChanged（javax.swing.event.ChangeEvent evt）{
//TODO在此处添加您的处理代码：
public class ResizableImagePane {

    public static void main(String[] args) {
        new ResizableImagePane();
    }

    public ResizableImagePane() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new ScalerPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    protected class ScalerPane extends JPanel {
        private JSlider slider;
        private ImagePane imagePane;
        public ScalerPane() {

            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();

            gbc.gridx = 0;
            gbc.gridy = 0;

            imagePane = new ImagePane();

            add(imagePane, gbc);

            gbc.gridy = 1;
            gbc.weightx = 0;
            gbc.weighty = 0;
            gbc.fill = GridBagConstraints.HORIZONTAL;

            slider = new JSlider();
            slider.setMinimum(1);
            slider.setMaximum(100);
            gbc.weightx = 1;
            gbc.weighty = 1;
            gbc.anchor = GridBagConstraints.SOUTH;
            gbc.fill = GridBagConstraints.HORIZONTAL;
            add(slider, gbc);

            slider.addChangeListener(new ChangeListener() {
                @Override
                public void stateChanged(ChangeEvent ce) {
                    imagePane.setZoom(slider.getValue() / 100f);
                }
            });
            slider.setValue(100);
        }
    }

    protected class ImagePane extends JPanel {
        private BufferedImage background;
        private Image scaled;
        private float zoom;
        public ImagePane() {
            try {
                background = ImageIO.read(new File("path/to/your/image"));
            } catch (IOException ex) {
                ex.printStackTrace();
            }

            setZoom(1f);
            setBorder(new LineBorder(Color.RED));
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(scaled.getWidth(this), scaled.getHeight(this));
        }

        public void setZoom(float zoom) {
            this.zoom = zoom;
            int width = Math.round(background.getWidth() * zoom);
            scaled = background.getScaledInstance(width, -1, Image.SCALE_SMOOTH);

            invalidate();
            revalidate();
            repaint();
        }

        public float getZoom() {
            return zoom;
        }

        @Override
        protected void paintComponent(Graphics grphcs) {
            super.paintComponent(grphcs);

            int x = (getWidth() - scaled.getWidth(this)) / 2;
            int y = (getHeight() - scaled.getHeight(this)) / 2;

            grphcs.drawImage(scaled, x, y, this);
        }
    }
}