Working of ImageObserver

ImageObserver interface is implemented by Applet in the form of imageUpdate method by which we can continuosly monitor the status of the image.
Does anybody know how this works internally ??
Does the imageUpdate fucntion periodically probe the image object to gather the state of the object
or
does the object itself push the changes to this funciton whenver it has accumulated more data ??
Can anyone help ?

or is it simply sloppy code that does not defined the ImageObserver in the drawImage parameter?As you are using BufferedImage, so using null as fourth parameter is alright.
Could someone explain the inner workings of this bit of code?I also don't know much about images, image observers, etc. so I don't know about inner workings. But following links would help you:
[http://java.sun.com/javase/6/docs/api/java/awt/Graphics.html#drawImage(java.awt.Image, int, int, java.awt.image.ImageObserver)]
[http://java.sun.com/docs/books/tutorial/2d/images/drawimage.html]
Thanks!

Similar Messages

  • GrabPixel() not working - ImageObserver.ALLBITS- HELZ PLZ

    I capturing an image form a camera (that works). Now I want to process the image so I call grabPixels but i get a problem. The bug occurs in the following piece of code.
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    I would really appreciate some help!

    I capturing an image form a camera (that works). Now I want to process the image so I call grabPixels but i get a problem. The bug occurs in the following piece of code.
    PixelGrabber pgObj = new PixelGrabber(
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    try{                              
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    So the problem is that ((pgObj.getStatus() & ImageObserver.ALLBITS != 0)) returns false. Same happens when I use ImageObserver.ERROR, ABORT and PROPERTIES.
    However it returns true when i use ImageObserver.FRAMEBITS, HEIGHT, SOMEBITS and WIDTH but the image i get is extremelly messed up (like disturbed by vertical black lines and u can hardly recognize a thing).
    Does anyone have an idea about what the cause might be?
    I would really appreciate some help!

  • Why Graphics.drawImage() can't work?

    Hi Veterans,
    I met some problems when I create an image by calling the Graphics.drawImage() method. Firstly, I created an off-screen image by calling the method frame.createImage(800, 640), then I was drawing some graphical elements on the the graphics acquired from the offscreen image, like drawString(), drawLine. And the most important step is as follows, I want to append another image from the file system to the current one by calling drawImage(Image img, int x, int y, ImageObserver frame), but it can't work, I got the appended image by calling Toolkit.getDefaultToolkit().createImage("D:\\abc.gif"). But I am not sure if it is a correct way to get an image from the file system. After that, I will use a 3rd party utitliy to generate new gif image. But when I view the new generated image, it only include the grahpical elements I drew by drawString(), drawLine, and the drawImage() seems can't work. Why?
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    This isn't right. The Toolkit returned by getDefaultToolkit has an implementation for all these methods. The issue here is that you are calling getWidth on the Image before the Image has been loaded from your gif file. What you need to do is to call getWidth(ImageObserver) and then, if the width comes back as -1 wait for the ImageObserver to notify you that it has loaded the width attribute of the image. Take a look at
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  • DrawImage and ImageObserver

    I'm trying to implement Servlet to render images from my local drive to Web-clients.
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    Where is that wise article which would tell me HOW to deal with this thig properly ?
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    I've been doing some more experiments around this issue since I started this topic.
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    WHERE IS THE LIGHT IN THIS JAVA-MAD-DARKNESS ?!

  • How does drawImage work?

    I'm working with drawImage of a JPanel Component. It has a very odd behaviour. It should require an Image as the first argument: for example, drawImage(img,0,0,null). Everything works fine when img is, for example, a BufferedImage created with createImage or ImageIO.read. The problems come when I use some MyImage class that extends Image. No way to get the image drawn. For example, I tried:
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    Status
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    Application Name: iTunes.exe
    Application Version: 10.0.0.68
    Application Timestamp: 4c7e6c10
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    Fault Module Version: 7.67.75.0
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    Exception Offset: 0082e666
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    Additional Information 1: 9c79
    Additional Information 2: 18d391556384f03f39cb1810be4919d6
    Additional Information 3: cbd8
    Additional Information 4: 7823eb2f440e23b0eb8dcc58dcf1c44e
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  • [Guide] Install and run Windows 7/8 from an external drive without using bootcamp (works for late 2012 iMacs with 3TB drive)

    This is a copy of a post from my blog, you can also Read it on my blog...
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    Hi i'm trying to follow your guide, I installed windows 8 on bootcamp to do it planning to remove it after the operation is done, but i get stuck at part 3: every command i give to imagex i get a pop-up ftom windws asking how do I want to open this kind of file install.wim and imagex does nothing, what do i have to do to stop those pop-ups?

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    thanks in advance

    Dear Sandy,
    Go to V/N1 transaction select your self defined access sequence then go in to the accesses and fields and check all fields are activated.
    Make sure that these fields are flowing in your sales order.
    I hope this will help you,
    Regards,
    Murali.

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