[Java] Picturebox

[elilo]

ciao,
sto sviluppando una picturebox, simile a quella di visual basic per intenderci...
sto cercando di modificare quella fatta da Mehmet Hakan Satman (qui il link)
ma ho qualche problema:

• Come ridimensiono l'immagine?
• Come posiziono l'immagine?
• Quando viene chiamato il paint (chiama lo stesso metodo anche il repaint?)

questo è il mio codice:

/**
 * JPictureBox
 * 
 * @author Ilo
 * @version 1.0
 * @info Inspired on Java PictureBox Control 1.0 by Mehmet Hakan Satman
 */

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.Toolkit;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.net.URL;

import com.msmfc.exceptions.MSMFCImageException;

public class JPictureBox2 extends Canvas {

    private static final long serialVersionUID = 1L;
    
    // constants
    public final int REDIM_CENTER = 1;
    public final int REDIM_FILL = 2;
    public final int REDIM_FIX = 3;
    public final int REDIM_EXTEND = 4;
    
    private BufferedImage bImg;
    private Graphics gImg;
    private int width;
    private int height;
    private boolean doRepaint = true;
    private Color bgColor;
    private Point imgPos;
    private int redimType;
    
    public JPictureBox2(int width, int height) {
        this.width = width;
        this.height = height;
        
        bImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        gImg = bImg.getGraphics();
        
        bgColor = Color.WHITE;
        imgPos = new Point(0, 0);
        redimType = REDIM_CENTER;
    }
    
    public void clear() {
        gImg.setColor(bgColor);
        gImg.clearRect(0, 0, width, height);
        if(doRepaint)
            this.repaint();
    }
    
    public boolean loadImage(String filename) {
        boolean result = true;
        URL url = null;
        
        try {
            url = new URL("file:" + filename);
        } catch (Exception e) {
            result = false;
        }
        
        MediaTracker med = new MediaTracker(this);
        Image gec = Toolkit.getDefaultToolkit().getImage(url);
        med.addImage(gec, 0);
        
        try {
            med.waitForAll();
        } catch (Exception e) {
            result = false;
        }
        gImg.drawImage(gec, 0, 0, this);
        
        if(doRepaint)
            this.repaint();
        
        return result;
    }
    
    private BufferedImage redimImage(BufferedImage img, int redimType) {
        double imgWidth = img.getWidth();
        double imgHeight = img.getHeight();
        
        switch(redimType) {
            case REDIM_CENTER:
                if((img.getHeight() < this.getHeight()) && (img.getWidth() < this.getWidth())) {
                    // center the image
                    int newX = (this.getWidth() - img.getWidth()) / 2;
                    int newY = (this.getHeight() - img.getHeight()) / 2;
                    
                    redimPos = new Point(newX, newY);
                }
                else {
                    // redim with FIX
                    // H : W = nH : nW
                    if(img.getHeight() >= img.getWidth()) {
                        // W = (H * nW) / nH
                        imgHeight = this.getHeight();
                        imgWidth = (imgHeight * this.getWidth()) / this.getHeight();
                    }
                    else {
                        // H = (W * nH) / nW
                        imgWidth = this.getWidth();
                        imgHeight = (imgWidth * this.getHeight()) / this.getWidth();
                    }
                }
                
                break;
            case REDIM_FILL:
                // H : W = nH : nW
                if(img.getHeight() < img.getWidth()) {
                    // W = (H * nW) / nH
                    imgHeight = this.getHeight();
                    imgWidth = (imgHeight * this.getWidth()) / this.getHeight();
                    
                    int newX = (-1) * ((img.getWidth() - this.getWidth()) /2);
                    
                    redimPos = new Point(newX, 0);
                }
                else {
                    // H = (W * nH) / nW
                    imgWidth = this.getWidth();
                    imgHeight = (imgWidth * this.getHeight()) / this.getWidth();

                    int newY = (-1) * ((img.getHeight() - this.getHeight()) /2);
                    
                    redimPos = new Point(0, newY);
                }
                
                break;
            case REDIM_FIX:
                // H : W = nH : nW
                if(img.getHeight() >= img.getWidth()) {
                    // W = (H * nW) / nH
                    imgHeight = this.getHeight();
                    imgWidth = (imgHeight * this.getWidth()) / this.getHeight();
                }
                else {
                    // H = (W * nH) / nW
                    imgWidth = this.getWidth();
                    imgHeight = (imgWidth * this.getHeight()) / this.getWidth();
                }
                
                break;
            case REDIM_EXTEND:
                imgHeight = this.getHeight();
                imgWidth = this.getWidth();
                
                break;
        }    
        
        BufferedImage ret = new BufferedImage((int)imgWidth, (int)imgHeight, img.getType());

        Graphics2D g = ret.createGraphics();
        AffineTransform at = AffineTransform.getScaleInstance(imgWidth, imgHeight);
        g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        g.drawImage(img, at, null);
        g.dispose();
        
        return ret;
    }

    @Override
    public void paint(Graphics g) {
        g.drawImage(bImg, imgPos.x, imgPos.y, this);
    }

} 

e la uso così

JPictureBox2 pic = new JPictureBox2(300, 200);
this.getContentPane().add(pic);

pic.clear();
pic.loadImage("D:\\asso_picche.jpg"); 

grazie in anticipo
ciao