Hi Andrew,
Thanks for the reply , I am using jdk 1.5.0_06.
Here are the steps I tried
1. First I created the BufferedImage object
BufferedImage buffered_image =
new BufferedImage (600, 300, BufferedImage.TYPE_INT_RGB);
new BufferedImage (600, 300, BufferedImage.TYPE_INT_RGB);
2. Now I create a Graphics2D object fromt the buffer so that I can write it into this bufferedImage object.
Graphics2D buf_image_graphics = buffered_image.createGraphics ();
3. Now once I have the graphics2d object I call
drawImage() method using it and construct a composite image.
Once done drawing, I need write the constructed composite image in the buffer object it to the file.
4.Now I create a new file using
File f = new File ("c:\\anImage.gif");
and write BufferedImage object into the file using
try {
ImageIO.write (buffered_image, "gif", f);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
After excuting the above progrm,
ImageIO.write (buffered_image, "gif", f);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
After excuting the above progrm,
A new file c:\\anImage.gif is created but this file is empty?
I dont know where did I go wrong.
Any help is appreciated.
Thanks
Deepak
On 6/13/06, Andrew Brygin <[EMAIL PROTECTED]> wrote:
Hi Deepak,
What version of jdk are you using?
ImageIO plugin for writing GIF images is available only starting
from jdk 6.0 b39.
If you are using older version please try latest jdk 6.0 beta.
Also note that GIF image format directly supports only images
with color palette. You are using TYPE_INT_RGB image that does
not have palette.
In such case palette will be constructed automatically but such
palette might be not ideal especially if original image has more
than 256 colors.
If GIF is not strict requirement for you I'd suggest to use PNG.
It should work fine with your images (without any quality issues)
and it is available since 1.4.2.
Thanks,
Andrew
Deepak Jain wrote:
> Hi,
> I am completely lost with Java2d. I have some how managed to construct a
> composite image and i dont understand how i did it. Please find the code
> below, I was working on one of ur examples.Now i need to dump this
> composite image to a temp file so that i can display it on the
> web-browser using the <img> tag of html. I tried BufferedImage but I am
> not able to understand what BufferedImage does, read java doc but
> failed to understand. Please let me know any solution for this.
>
>
>
> import java.awt.Dimension;
> import java.awt.Graphics;
> import java.awt.Graphics2D;
> import java.awt.Image;
> import java.awt.MediaTracker;
> import java.awt.RenderingHints ;
> import java.awt.Toolkit;
> import java.awt.event.WindowAdapter;
> import java.awt.event.WindowEvent;
> import java.awt.image.BufferedImage;
> import java.io.File;
> import java.io.IOException ;
>
> import javax.imageio.ImageIO;
> import javax.swing.JApplet;
> import javax.swing.JFrame;
> /*
> <applet code="ACImages" width="600" height="300"></applet>
> */
> public class ACimages extends JApplet {
>
> private String m_backGroundImgName = "emptyEnclosure.gif";
>
> private Image backImgObj;
>
> private final int []backImgDimen = {240,150};
>
> private String dimentionInfo[] =
> {"server_1X_2Y","server_1X_2Y","server_1X_2Y","server_1X_2Y"
> ,"server_1X_2Y","server_1X_2Y","server_1X_2Y","server_1X_2Y"};
>
> private Image eleImgObj[] = new Image[dimentionInfo.length];
>
> private final int MAX_NUM_SLOTS_XDIRECT = 8;
>
> public void init() {
> Toolkit tk = getToolkit();
> backImgObj =
> tk.getImage(ACimages.class.getResource(m_backGroundImgName));
> try {
> MediaTracker tracker = new MediaTracker(this);
> tracker.addImage (backImgObj, 0);
> tracker.waitForID (0);
> } catch (Exception e) {}
>
> for(int i = 0; i < dimentionInfo.length; i++) {
> eleImgObj[i] =
> tk.getImage (ACimages.class.getResource(dimentionInfo[i] + ".gif"));
> try {
> MediaTracker tracker = new MediaTracker(this);
> tracker.addImage(eleImgObj[i], 0);
> tracker.waitForID(0);
> } catch (Exception e) {}
> }
> }
>
> public void drawDemo(int w, int h, Graphics2D g2) {
>
> int iw = 24;
> int ih = 150;
> float xx = 0, yy = 10;
> g2.drawImage(backImgObj, (int) xx, (int) yy, backImgDimen[0],
> backImgDimen[1], null);
> for (int i =0; i < eleImgObj.length ; i++) {
>
> if(i>MAX_NUM_SLOTS_XDIRECT-1) {
> xx = 0;
> }
> xx += iw;
> g2.drawImage(eleImgObj[i], (int) xx, (int) yy, iw, ih, null);
> Image status =getToolkit().getImage(
> ACimages.class.getResource("Critical" + ".gif"));
> try {
> MediaTracker tracker = new MediaTracker(this);
> tracker.addImage(status, 0);
> tracker.waitForID(0);
> } catch (Exception e) {}
> g2.drawImage(status, (int) xx+6, (int) yy+6, 13, 13, null);
> }
> }
>
>
> public void paint(Graphics g) {
> Graphics2D g2 = (Graphics2D) g;
> Dimension d = getSize();
> g2.setBackground(getBackground());
> g2.clearRect(0, 0, d.width, d.height);
> g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
> RenderingHints.VALUE_ANTIALIAS_ON);
> g2.setRenderingHint (RenderingHints.KEY_RENDERING,
> RenderingHints.VALUE_RENDER_QUALITY );
> drawDemo(d.width, d.height, g2);
>
> }
>
> private void writeToFile() {
> BufferedImage buffered_image =
> new BufferedImage (600, 300, BufferedImage.TYPE_INT_RGB );
> Graphics2D buf_image_graphics = buffered_image.createGraphics ();
> System.out.println("buffered_image :"+buffered_image);
> Dimension d = getSize();
> buf_image_graphics.setBackground(getBackground());
> buf_image_graphics.clearRect(0, 0, d.width, d.height);
> buf_image_graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
> RenderingHints.VALUE_ANTIALIAS_ON);
> buf_image_graphics.setRenderingHint( RenderingHints.KEY_RENDERING,
> RenderingHints.VALUE_RENDER_QUALITY);
> drawDemo(d.width, d.height, buf_image_graphics);
> File f = new File ("c:\\anImage.gif");
> try {
> ImageIO.write (buffered_image, "gif", f);
> } catch (IOException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
>
> System.out.println("buffered_image :"+buffered_image);
>
> }
>
> public static void main(String argv[]) {
> final ACimages demo = new ACimages();
> demo.init();
> JFrame f = new JFrame("Java 2D(TM) Demo - ACimages");
> f.addWindowListener (new WindowAdapter() {
> public void windowClosing(WindowEvent e) {System.exit (0);}
> });
> f.getContentPane().add("Center", demo);
> f.pack();
> f.setSize(new Dimension(600,300));
> f.show();
> demo.writeToFile ();
> }
> }
>
>
> --
> Bad boy for life !!!
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