Solved

Creating an Image of a invisible component

Posted on 2003-11-04
9
192 Views
Last Modified: 2010-03-31
Hi, i know how to create a Image from a JComponent or anything that have a paint function. It create my Image with no problem. But now i have to create a Image Object of a JComponent that the user won't have to see. I set my Component to setVisible(false) and when i create the Image, my Image Object is null but if i setVisible(true) and i do the Image it's ok. So my question: "is there a way to create an Image Object from a Component that are not visible?"

i use this code to create the Image Object


Rectangle rect = table.getBounds();
Image ima = createImage(rect.width, rect.height);
Graphics2D g = (Graphics2D) ima.getGraphics();
table.paint(g);
g.dispose();



thx
0
Comment
Question by:bumpert
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 3
9 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 9680287
You could only save an image of something when it's visible, so you'd have to show it then hide it.
0
 

Author Comment

by:bumpert
ID: 9680329
hummm it's not really usefull.... cause i do my picture when a bi things is loading, so the user have the time to see the component visible, and i cant do my image elsewhere...

i was thinking that somebody could have a solution for that :(

thx
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 9680481
AFAIK, that's the situation i'm afraid
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:bumpert
ID: 9681393
humm ok
0
 

Accepted Solution

by:
vitallis earned 125 total points
ID: 9707900
I had the same task and the solution was very simple. What I did is
- created offscreen buffered image
    int width = <desired width>;
    int height = <desired height>;
    java.awt.image.BufferedImage bi = new java.awt.image.BufferedImage(width, height, java.awt.image.TYPE_INT_ARGB);
- created Graphics2D of it
    java.awt.Graphics2D gr = ni.createGraphics();
- called the component paint()
    table.paint(gr);

Now I have an offscreen image.
0
 

Author Comment

by:bumpert
ID: 9708049
thx someone already answer me on the java forum, but i'll give you the points
0
 

Author Comment

by:bumpert
ID: 9708053
java sun forum, sorry :)
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 9709695
Sorry bumpert - for some reason, an off-screen image didn't occur to me.
0
 

Author Comment

by:bumpert
ID: 9714587
no problem man, we cannot know all the things :)
if yes i didn't post qa question here :)

thx to all for your help
im leaving this topic
0

Featured Post

Creating Instructional Tutorials  

For Any Use & On Any Platform

Contextual Guidance at the moment of need helps your employees/users adopt software o& achieve even the most complex tasks instantly. Boost knowledge retention, software adoption & employee engagement with easy solution.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

An old method to applying the Singleton pattern in your Java code is to check if a static instance, defined in the same class that needs to be instantiated once and only once, is null and then create a new instance; otherwise, the pre-existing insta…
INTRODUCTION Working with files is a moderately common task in Java.  For most projects hard coding the file names, using parameters in configuration files, or using command-line arguments is sufficient.   However, when your application has vi…
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.

688 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question