mobile map

[moabiran]

hi all;
I wrote this program after reading this link

I'm developing program for mobile to load and scroll maps.
I want to know your opinion about this code.
breif:
main map divided to small tiles by photoshop
for show only some tiles


excuse me for poor english.

 package imagePack;
import java.io.IOException;
import javax.microedition.lcdui.Canvas; 
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

public class ImageCanvas extends Canvas
{
    private int SCRN_WDTH=this.getWidth();
    private int SCRN_HGHT=this.getHeight();
    
    private int TILE_WDTH=115;
    private int TILE_HGHT=130;
    
    /*
     * width of tile is near 115*4 => 115*4= bffrWdth=460;
     * hieght of tile is near 130=>130*4= bffrHght=520;
     */
    private int cntRowTile;
    private int cntColTile;
    
    private int BFFR_WDTH=460;
    private int BFFR_HGHT=520;
    
    private int bffrTop;
    private int bffrLeft;
    
    private int CURRENT_ROW,CURRENT_COL;
    private String [][] tilesName=new String[10][8]; 
    public ImageCanvas()
    {
        try
        {
            this.CURRENT_ROW=4;//srart row  
            this.CURRENT_COL=4;//start col
            
            this.bffrTop=-30;//buffer top 8
            this.bffrLeft=-30;//buffer left
            initialize();
            this.calculateBffrImg();
        } catch (Exception ex)
        {
            ex.printStackTrace();
        }
    }
    
    public void initialize()
    {
        String imgNm;
        int cntRow;
        int cntCol;
        //tilesName=new String[10][8];
        for( cntRow=1 ; cntRow<= 10 ;cntRow++)
        {
            for( cntCol=1 ; cntCol<= 8;cntCol++ )
            {
               imgNm="yazd-" +cntRow+ "("+ cntCol +")" ;
               tilesName[cntRow-1][cntCol-1]=imgNm;
            }
        }
     //......calculate count of tiles........ ...\\
     cntColTile= SCRN_WDTH/TILE_WDTH +2;
     cntRowTile= SCRN_HGHT/TILE_HGHT+2;
    
     BFFR_WDTH=cntColTile*TILE_WDTH ;
     BFFR_HGHT=cntRowTile*TILE_HGHT;
    }
    public void calculateBffrImg()
    {        
//-----------move between -----------\\
        //if(bffrTop!=0)
        {
            if(bffrTop>=0) 
            {
                bffrTop-=TILE_HGHT;
                CURRENT_ROW-=1;

            }
            else if(bffrLeft>=0) 
            {
                bffrLeft-=TILE_WDTH;
                CURRENT_COL-=1;
            }
            else if(Math.abs(bffrTop)+SCRN_HGHT+20>= BFFR_HGHT)
            {
                bffrTop+=TILE_HGHT;
                CURRENT_ROW+=1;
            }
            else if(Math.abs(bffrLeft)+SCRN_WDTH+20>= BFFR_WDTH)
            {
                bffrLeft+=TILE_WDTH;
                CURRENT_COL+=1;
            }
            this.repaint();
       }
    }
    protected void paint(Graphics g)
    {
        int cntRow;
        int cntCol;
        int tilesX=bffrLeft;
        int tilesY=bffrTop;
        String address;
        Image img;
        
        try
        {
            if (CURRENT_ROW<=0)
            {
                CURRENT_ROW=0;
                bffrTop-=TILE_HGHT;
            }
            else if (CURRENT_COL<=0) 
            {
                CURRENT_COL=1;
            }
            else
            {
                g.setColor(0, 0, 0);
                g.fillRect(0, 0, this.getWidth(), this.getHeight());
                for(cntRow=CURRENT_ROW ; cntRow<CURRENT_ROW+ cntRowTile; cntRow++)
                {
                    for(cntCol=CURRENT_COL ; cntCol<CURRENT_COL+cntColTile ; cntCol++)
                    {
                        address="/"+tilesName[cntRow][cntCol]+".png";
                        img=Image.createImage(address);
                        g.drawImage(img,tilesX,tilesY,0);
                        tilesX+=TILE_WDTH;
                    } 
                 tilesX=bffrLeft; tilesY+=TILE_HGHT;
                }
            }
       } 
       catch (IOException ex)
       {
           ex.printStackTrace();
       }
    }

    protected void keyPressed(int keyCode)
    {
        int gameAction = this.getGameAction(keyCode);
        int MOVE=10;
        if (keyCode== Canvas.KEY_NUM2 || gameAction==Canvas.UP)
        {
                  bffrTop+= MOVE;
        } else if (keyCode == Canvas.KEY_NUM8 || gameAction==Canvas.DOWN)
        {
            bffrTop-= MOVE;
        } else if (keyCode == Canvas.KEY_NUM6 || gameAction==Canvas.RIGHT)
        {
            bffrLeft -= MOVE;
        } else if (keyCode == Canvas.KEY_NUM4 ||gameAction==Canvas.LEFT)
        {
            bffrLeft+= MOVE;
        }
        calculateBffrImg();
    }
    protected void keyRepeated(int keyCode)
    {
       keyPressed(keyCode);
    }
}

[im2amit]

Are you facing any specific problem in this ?