Name: gsC80088 Date: 02/10/99


Dear Sir/Madam

I tried to change the Raster data directly (Raster of an Image Buffer),but the program does not do the operation I
implement in the code.Below is my code :

import java.awt.*;
import java.awt.event.*;
import com.sun.image.codec.jpeg.*;
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.geom.GeneralPath;
import java.awt.color.ColorSpace;
import java.io.*;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.lang.*;


public class HW51a extends Canvas {

    private Image img;

    public HW51a() {
        setBackground(Color.white);
    }


    public void paint(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;


BufferedImage bi = new BufferedImage(256, 256,BufferedImage.TYPE_BYTE_GRAY);

WritableRaster r = bi.getRaster();
System.out.println(r.getHeight());
System.out.println((r.getDataBuffer()).getDataTypeSize(0));
System.out.println(r.getBounds());
System.out.println(r.getNumBands());
System.out.println(r.getNumDataElements());

byte[] f = new byte[100];
Integer x = new Integer(1);
byte m = x.byteValue();
for(int j = 0;j < 100 ; j++)
f[j] = m;

r.setDataElements(0,0,9,9,(Object)f);
bi.setData((Raster)r);

Graphics2D big = bi.createGraphics();

// .. use rendering hints from J2DCanvas ..
        big.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        big.setRenderingHint(RenderingHints.KEY_RENDERING,
                            RenderingHints.VALUE_RENDER_QUALITY);

big.setBackground(Color.white);
big.clearRect(0, 0, 256, 256);

big.setColor(Color.black);

big.fillRect(64,120,128,16);


big.drawImage(bi, 0, 0, this);
 

    }


    public static void main(String s[]) {
WindowListener l = new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
};
Frame f = new Frame("Java2D Demo");
f.setResizable(false);
f.setLayout(null);
HW51a hw = new HW51a();
hw.setSize(new Dimension(256,256));
f.add(hw);
f.addWindowListener(l);
f.pack();
f.setSize(new Dimension(256,256));
f.show();
    }
}

If you compile it you will see that it doesnt paint the rectangle that I directly write into the raster of the BufferedImage.Waiting for an answer about that..

Sincerely
Cenk Demiroglu
(Review ID: 47416)
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