Solved

Image flicker

Posted on 2002-06-05
5
272 Views
Last Modified: 2010-03-31
I have written an applet that does banner rotation. The only thing is that the banners flicker, as though they are being redrawn by clearing to the background first. It doesn't matter whether the banner is animated of not and it is not occuring at the point when the banner image is changed.

My paint method looks as follows

     public void paint(Graphics g)
     {
          Image image=getImage(u[current_image]);
          g.drawImage(image,0,0,this);
     }

Just to make sure I used Mediatracker to ensure the image was loaded, but this had no effect.

Any clues how I can overcome this?
0
Comment
Question by:mouatts
  • 3
  • 2
5 Comments
 
LVL 16

Accepted Solution

by:
imladris earned 50 total points
ID: 7057489
In your applet, you need to override the update method. In the same class that contains the paint method, provide an override for the update method like:

public void update(Graphics g)
{   paint(g);
    return;
}


This needs to be done to avoid the flicker because the default update does exactly what you suspected. It clears the image by redrawing the background first.
0
 
LVL 11

Author Comment

by:mouatts
ID: 7058268
Thanks that sort of did the trick, there was another wrinkle that someone else might have mentioned had you not locked the question!
0
 
LVL 16

Expert Comment

by:imladris
ID: 7059476
For the sake of the value of the PAQ's, it would be nice if you mentioned what the wrinkle was.

If you dislike questions being "locked" (which does not in fact prevent anyone from adding comments), you could mention that in the question or reject the answer.

The guideline for answers below notes that an answer should be "a specific solution to a question ... [that] will solve the questioner's problem and doesn't duplicate a previous comment".
The answer I gave obviously did not duplicate a comment, and it was my conviction that it would solve your problem. There is always the possibilty that I am wrong, of course, which is why you have access to the "reject answer" button.
0
 
LVL 16

Expert Comment

by:imladris
ID: 7059486
P.S. there is an extensive debate on the topic of answers and comments at: http://www.experts-exchange.com/expinput/Q_20304200.html .
0
 
LVL 11

Author Comment

by:mouatts
ID: 7059529
You've been on EE long enough to know that locking questions is frowned on by the vast majority of members.

The wrinkle is of course dealing with the situation when you do want to repaint the background. The answer of course being to use super.update(g) on those occasions.
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
javap not working 8 58
Way to decrease size of apk file 9 86
sql import cannot be resolved jsp 3 47
junit as external jar or library 7 22
For beginner Java programmers or at least those new to the Eclipse IDE, the following tutorial will show some (four) ways in which you can import your Java projects to your Eclipse workbench. Introduction While learning Java can be done with…
Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Viewers learn about the “while” loop and how to utilize it correctly in Java. Additionally, viewers begin exploring how to include conditional statements within a while loop and avoid an endless loop. Define While Loop: Basic Example: Explanatio…
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:

860 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