Solved

Java Newbie with Errors Question

Posted on 2011-03-06
6
829 Views
Last Modified: 2012-05-11
Hi All,

I have just started learning Java; so I don't know much and could really
use some help on this since I have spent hours and I'm not getting
anywhere.   I had H.W. that wanted me to do a  rotate filter on an image.
I thought it would be a switch of x,y.  Well, the code compiles but I'm getting all
these errors when I try to apply it.  What do all these errors mean?

Here's the code:

import java.awt.Color;

public class RotateFilter extends Filter
{
      
    public RotateFilter(String name)
    {
        super(name);
      }
    public void apply(OFImage image)
    {
        int height = image.getHeight();
        int width = image.getWidth();
        for(int y = 0; y < height; y++) {
            for(int x = 0; x < width; x++) {
             image.setPixel(y, x, image.getPixel(y, height-1-x));
}}}}
                       
            Here's part of the errors:  They go on and on
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: Coordinate out of bounds!
      at sun.awt.image.ByteInterleavedRaster.getDataElements(ByteInterleavedRaster.java:301)
      at java.awt.image.BufferedImage.getRGB(BufferedImage.java:871)
      at OFImage.getPixel(OFImage.java:54)
      at RotateFilter.apply(RotateFilter.java:33)
      at ImageViewer.applyFilter(ImageViewer.java:126)
      at ImageViewer.access$600(ImageViewer.java:22)

Thanks in advance for any help.
      
0
Comment
Question by:NewbieITGal
6 Comments
 
LVL 20

Expert Comment

by:Sathish David Kumar N
ID: 35046936
> >>>>>>Here the problem height-1-x


can you post get pixel code
0
 
LVL 86

Accepted Solution

by:
CEHJ earned 80 total points
ID: 35047129
I think they probably mean you to extend ImageFilter. Here's an example:

http://www.enme.umd.edu/ESCML/Courseware/Rotate90DegreeFilter.java
0
 
LVL 47

Assisted Solution

by:for_yan
for_yan earned 45 total points
ID: 35047170

Has your image square shape  - so that always width == height ?
If not then
as the first position corresponds to width, and your y corresponds to height,
so if your image is rectangular (not square) , then y in the fist position going up to height
will become higher than the limit of your image on the width if height > width, or
there wiil be similar problem on the second position if height < width.

I am also not sure you can manipulate all within one image - it is safer to create new image instance
with the same dimensions and assign pixels of image1 to image
and then replace the whole image.

Of course to extend ImageFilter as CEHJ suggested is probably the way the do such things

 
0
Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
LVL 92

Expert Comment

by:objects
ID: 35048276
you need to create a new image to copy the rotated pixels into (as the rotated image will not be the same size as the original image), similiar to what is done when resizing an image
0
 

Author Closing Comment

by:NewbieITGal
ID: 35058734
Thank you to all of you for getting me back on track
with the extend Image Filter.

Thanks again for the help.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 35059721
:)
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
mockito example issue 8 73
java 8 lambda expresssions exception handling 3 91
more than one jdk and one jre 1 41
MySqlDump not dumping triggers 1 31
For customizing the look of your lightweight component and making it look lucid like it was made of glass. Or: how to make your component more Apple-ish ;) This tip assumes your component to be of rectangular shape and completely opaque. (COD…
By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:
The viewer will learn how to implement Singleton Design Pattern in Java.

810 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