Java(TM) Boutique - Using Rasters for Image Processing, Part 2

Listing 2: Extracting a raster from a BufferedImage object.


Listing-ul RasterFromBufferedImage.java

import java.awt.*;
import java.awt.image.*;

class ExtractingRaster extends Frame{

Image IMG=null;
//the Image object used for obtain a BufferedImage object
BufferedImage BI=null; 
// the BufferedImage object from witch the raster will be extracted
BufferedImage BIR=null;  
//the BufferedImage used for drawing raster on screen

    public ExtractingRaster(String title)
           {
           super(title);
           }

    void init()
           {       
           setLayout(null);
           setSize(400,150);  
           setVisible(true);
           }           
           
    void extracting()
           { 
           Toolkit tk=Toolkit.getDefaultToolkit();
           IMG=tk.getImage("C:\\JEditor\\x\\raptor.jpg");       
           MediaTracker mt = new MediaTracker(this);
           mt.addImage(IMG,1);
           try {
                mt.waitForAll();
                } catch (InterruptedException e) 
                                    {System.out.println(e.getMessage());};
         
           //getting the Image dimensions
           int W=IMG.getWidth(this);
           int H=IMG.getHeight(this);
           
           //creating from the IMG object a BufferedImage
           BI=new BufferedImage(W,H,BufferedImage.TYPE_INT_RGB);
           }
            
public void paint(Graphics g)
       {   
       //drawing the original image
       g.drawImage(IMG,20,20,this);  
       
       Graphics2D g2D = BI.createGraphics();
       g2D.drawImage(IMG,0,0,this);       

       Graphics2D g2=(Graphics2D)g;              
        
        //getting the BufferedImage dimensions                 
       int w = BI.getWidth(this);
       int h = BI.getHeight(this); 

      //setting the raster dimensions      
      Rectangle rect=new Rectangle(0,0,w/3,h/3);        

      //using the getData method for extracting the raster   
      Raster R=BI.getData(rect);                   
      
      //convert the raster back to a BufferedImage
      BufferedImage BIR=new
	   BufferedImage(BI.getColorModel(),(WritableRaster)R,false,null);    
      
      //drawing the raster
       g2.drawImage(BIR,null,300,30);
       }                 
  }

public class RasterFromBufferedImage{
       public static void main(String[] args)
              {
              ExtractingRaster t=new ExtractingRaster("Raptor");
              t.extracting();
              t.init();
              }
}

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