Yousuf
Posts: 19
Nickname: saeed
Registered: Mar, 2002
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Re: light a pixel
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Posted: Mar 27, 2002 8:35 PM
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Hello fara..
I hope the following code of mine will you help that explore the functionality of pixel grabber class.
This class is used to adjust your image in terms of pixel according to your requirement.
import java.awt.*;
import java.io.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.color.*;
import java.util.*;
import javax.swing.*;
public class RGBImageFactory implements ImageObserver{
public static void main(String[] args){
RGBImageFactory ifact = new RGBImageFactory();
/* if(args.length <1) {
System.out.println("Enter a valid image file name");
System.exit(0);
}*/
ifact.createRGBBufferedImage("Bup.jpg");//any image should be in same folder
}
public Image readImage(String imageName){
Image image = Toolkit.getDefaultToolkit().getImage(imageName);
MediaTracker imageTracker = new MediaTracker(new JPanel());
imageTracker.addImage(image, 0);
try{
imageTracker.waitForID(0);
}catch(InterruptedException e){ return null;}
return image;
}
public boolean imageUpdate(Image img,
int infoflags,
int x,
int y,
int width,
int height){
if((infoflags & ImageObserver.ERROR) != 0){
System.out.println("ERROR in image loading or drawing");
return false;
}
if((infoflags & (ImageObserver.FRAMEBITS | ImageObserver.ALLBITS))!= 0) {
return false;
}
return true;
}
public int[] fetchPixels(Image image, int width, int height){
int pixMap[] = new int[width*height];
PixelGrabber pg = new PixelGrabber(image, 0,0,width,height, pixMap, 0, width);//thats you want...Use OF PixelGrabber
try {
pg.grabPixels();
} catch (InterruptedException e){return null;}
if((pg.status() & ImageObserver.ABORT)!=0){
return null;
}
return pixMap;
}
public byte[] extractData(int[] pixmap, int numbands) {
byte data[] = new byte[pixmap.length*numbands];
for(int i=0;i<pixmap.length;i++){
int pixel = pixmap;
byte a = (byte)((pixel >> 24) & 0xff);
byte r = (byte)((pixel >> 16) & 0xff);
byte g = (byte)((pixel >> 8) & 0xff);
byte b = (byte)((pixel ) & 0xff);
if(numbands == 4){
data[i*numbands+0] = r;
data[i*numbands+1] = g;
data[i*numbands+2]= b;
data[i*numbands+3] = a;
} else {
data[i*numbands+0] = r;
data[i*numbands+1] = g;
data[i*numbands+2]= b;
}
}
return data;
}
public static void displayImage(BufferedImage img){
JFrame fr = new JFrame();
ImagePanel pan = new ImagePanel(img);
pan.setSize(150,150);
fr.getContentPane().add(pan);
fr.pack();
fr.setSize(150,150);
fr.show();
}
public void createRGBBufferedImage(String filename) {
Image awtImage = readImage(filename);
int imageWidth = awtImage.getWidth(this);
int imageHeight = awtImage.getHeight(this);
int[] pix = fetchPixels(awtImage, imageWidth, imageHeight);
byte[] data = extractData(pix, 4);
BufferedImage image = createInterleavedRGBImage(imageWidth, imageHeight, 8, data,true);
displayImage(image);
}
public static BufferedImage createInterleavedRGBImage(int imageWidth,
int imageHeight,
int imageDepth,
byte data[],
boolean hasAlpha){
int pixelStride,transparency ;
if(hasAlpha) {
pixelStride = 4;
transparency = Transparency.BITMASK;
}
else {
pixelStride = 3;
transparency = Transparency.OPAQUE;
}
int[] numBits = new int[pixelStride];
int[] bandoffsets = new int[pixelStride];
for(int i=0;i<pixelStride;i++){
numBits = imageDepth;
bandoffsets =i;
}
ComponentColorModel ccm = new ComponentColorModel(
ColorSpace.getInstance(ColorSpace.CS_sRGB),
numBits,
hasAlpha,
false, //Alpha pre-multiplied
transparency,
DataBuffer.TYPE_BYTE);
PixelInterleavedSampleModel csm = new PixelInterleavedSampleModel(
DataBuffer.TYPE_BYTE,
imageWidth, imageHeight,
pixelStride, //Pixel stride
imageWidth*pixelStride, // Scanline stride
bandoffsets);
DataBuffer dataBuf = new DataBufferByte(data, imageWidth*imageHeight*pixelStride);
WritableRaster wr = Raster.createWritableRaster(csm, dataBuf, new Point(0,0));
Hashtable ht = new Hashtable();
ht.put("owner", "Lawrence Rodrigues");
return new BufferedImage(ccm, wr, false, ht);
}
static class ImagePanel extends JComponent {
protected BufferedImage image;
public ImagePanel(){}
public ImagePanel(BufferedImage img){ image = img;}
public void setImage(BufferedImage img){ image = img; }
public void paintComponent(Graphics g){
Rectangle rect = this.getBounds();
if(image != null) {
g.drawImage(image, 0,0,rect.width, rect.height, this);
}
}
}
}
Yousuf
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