import java.awt.*;
import java.awt.image.*;
import java.io.*;
import com.sun.image.codec.jpeg.*;

/**
 * Resizes jpeg image files on your file system.
 * Uses the com.sun.image.codec.jpeg package shipped
 * by Sun with Java 2 Standard Edition.
 *
 * @author Randy Belknap
 */
public class Resize extends Panel {

 /**
  * @param originalImage the file name of the image to resize
  * @param newImage the new file name for the resized image
  * @param factor the new image's width will be  width * factor.
         * The height will be proportionally scaled.
  */
    public void doResize(String originalImage, String newImage, double factor) {
        Image img = getToolkit().getImage(originalImage);
        loadImage(img);
        int iw = img.getWidth(this);
        int ih = img.getHeight(this);
        
        //Reduce the image
        int w = (int)(iw * factor);
        Image i2 = img.getScaledInstance(w, -1, 0);
        loadImage(i2);
            
        //Load it into a BufferedImage
        int i2w = i2.getWidth(this);
        int i2h = i2.getHeight(this);
        BufferedImage bi = new BufferedImage(i2w, i2h, BufferedImage.TYPE_INT_RGB);
        Graphics2D big = bi.createGraphics();
        big.drawImage(i2,0,0,this);
        
        //Use JPEGImageEncoder to write the BufferedImage to a file
        try{
         OutputStream os = new FileOutputStream(newImage);
         JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
         encoder.encode(bi);
        } catch(IOException ioe){
         ioe.printStackTrace();
        }
    }
    
    public void doResize(String originalImage, String newImage, int area) {
        Image img = getToolkit().getImage(originalImage);
        loadImage(img);
        int iw = img.getWidth(this);
        int ih = img.getHeight(this);
        
        double factor = (double)area / (iw * ih);
        
        //Reduce the image
        int w = (int)(iw * factor);
        Image i2 = img.getScaledInstance(w, -1, 0);
        loadImage(i2);
            
        //Load it into a BufferedImage
        int i2w = i2.getWidth(this);
        int i2h = i2.getHeight(this);
        BufferedImage bi = new BufferedImage(i2w, i2h, BufferedImage.TYPE_INT_RGB);
        Graphics2D big = bi.createGraphics();
        big.drawImage(i2,0,0,this);
        
        //Use JPEGImageEncoder to write the BufferedImage to a file
        try{
         OutputStream os = new FileOutputStream(newImage);
         JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
         encoder.encode(bi);
        } catch(IOException ioe){
         ioe.printStackTrace();
        }
    }
    
    /**
     * Cause the image to be loaded into the Image object
     */
    private void loadImage(Image img){
      try {
      MediaTracker tracker = new MediaTracker(this);
      tracker.addImage(img, 0);
      tracker.waitForID(0);
      } catch (Exception e) {}
    }

    public static void main(String args[]) {
      if(args.length != 3){usage();}
      //double factor = Double.parseDouble(args[2]);
      int area = Integer.parseInt(args[2]);
      Resize resizer = new Resize();
      //resizer.doResize(args[0], args[1], factor);
      resizer.doResize(args[0], args[1], area);
      System.exit(0);
    }
    
    public static void usage(){
     System.out.println("usage: java Resize original_file new_filename resize_factor");
     System.exit(1);
    }

}