Please Help me on Image Scaling!!

Question

I am trying to get a map.jpg to scale to fit the window while still able to zoom in & out with mouselistener(which where I clicked). I am able to zoom in & out but the coordinate is according to the original size. Please help.

Answer 1

1.I am not familiar with Graphics & Graphics2D. The Following code have problem in showing the map in BufferedImage, which is plotted with small dots on it. Actually, it's the Graphics & Graphics2D coding problem that I am facing. I don't know how to use the function.
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.net.*;
import java.io.*;
import java.util.*;
import java.awt.image.*;
import java.awt.geom.*;
public class GPSMap extends JPanel
private Image map,scaled;
private double zoomfac=1;
private BufferedImage bufi;
int zoomcx,zoomcy,zoomh,zoomw,w,h,newHeight,newWidth,newx,newy,newcx,newcy;
public GPSMap()
System.out.println("Loading GPSStatus");
this.setLayout(new BorderLayout());
map = getToolkit().getImage("Map3.jpg");
MediaTracker track=new MediaTracker(this);
track.addImage(map,0);
try{track.waitForID(0);}
catch(InterruptedException ie){}
w=map.getWidth(this);
h=map.getHeight(this);
bufi=new BufferedImage(w,h,BufferedImage.TYPE_INT_ARGB_PRE);
newHeight=650;
newWidth=(int)(newHeight*w/h);
scaled=map.getScaledInstance(newWidth,newHeight,map.SCALE_SMOOTH);
addMouseMotionListener(new MouseMotionAdapter()
public void mouseMoved(MouseEvent m)
     System.out.println("Move at ["+m.getX()+", "+m.getY()+"]");
zoomcx = m.getX()-(zoomw/2);
zoomcy = m.getY()-(zoomh/2);
     newx=(int)(m.getX()*newWidth/w);
     newy=(int)(m.getX()*newHeight/h);
     newcx=newx-(zoomw/2);
     newcy=newy-(zoomh/2);
if (zoomcx <= 0)
zoomcx = 0;
if (zoomcy <= 0)
zoomcy = 0;
// if (zoomfac != 1)
// repaint();
repaint();
The following part is an extra but cannot do it.
addMouseListener(new MouseAdapter()
public void mouseReleased(MouseEvent m)
if (m.getModifiers() == InputEvent.BUTTON3_MASK)
zoomfac = zoomfac - 0.21;
else
zoomfac = zoomfac + 0.21;
     if (zoomfac <=1)
     zoomfac=1;
repaint();
public void paint (Graphics g)
GPS3 s3=new GPS3();
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHints(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_SPEED);
Graphics2D gc=bufi.createGraphics();
gc.setColor(Color.red);
for(int i=0;i<=s3.ix.length;i++){
     gc.drawRect(s3.iy[i]-1,s3.ix[i]-1,2,2);//For plotting purposes, but not yet finish
gc.drawImage(scaled,50,50,this);
gc.drawImage(bufi,zoomcx,zoomcy,newcx,newcy,100,70,this);
P.S. I don't know how to change it to runnable application. Please help.