Java-Gaming.org    
Featured games (81)
games approved by the League of Dukes
Games in Showcase (480)
Games in Android Showcase (110)
games submitted by our members
Games in WIP (547)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  How do I handle "bitmasks"-arrays of an image? Too long values!  (Read 536 times)
0 Members and 1 Guest are viewing this topic.
Offline DururumWheat

Junior Newbie





« Posted 2012-08-06 14:48:57 »

Hey I got this code that checks two images that overlap each other if any pixels are transparent, anyway; I made an array like this and I got it to work:

The image is 8x8 so I make the array like this:

1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
13  
14  
15  
16  
17  
18  
public long[] getArray(){
      long[] array = new long[8];
      String s = null;
     
      for(int i = 0; i<8; i++){
         for(int z = 0; z <8; z++){
            String s2;
            if(image.getRGB(z, i)==0){ s2 = "0";}
            else s2 = "1";
           
            if(s == null) {s = s2;}
            else s+=s2;  
         }
         array[i] = Long.parseLong(s);
         s = null;
      }
      return array;
   }



As you see, the result would be a 8 long array with each cell representing a whole row of the image so for example, the value of array[0] would represent a whole row like:
111000

But here's the problem... For this to work, the image has to be less wide than 20 pixels or else I get a NumberFormatException, in other words the whole combination of
1s and 0s becomes too long.

So, how are you actually supposed to handle these bitmask arrays since a mere 20 pixels is very restrictive!
Offline Riven
« League of Dukes »

JGO Overlord


Medals: 781
Projects: 4
Exp: 16 years


Hand over your head.


« Reply #1 - Posted 2012-08-06 14:52:07 »

Let's ignore that the use of Strings for this is rather inefficient, as 'it works'...

You should interpret the string as binary, so '10' wouldn't be ten, but two.

1  
Long.parseLong(s, 2 /* radix */);

Hi, appreciate more people! Σ ♥ = ¾
Learn how to award medals... and work your way up the social rankings
Offline DururumWheat

Junior Newbie





« Reply #2 - Posted 2012-08-06 15:59:53 »

Oh I see, such an easy solution! Thanks a lot!!!



However, if still interested, could you briefly just say what the more efficient method is? Instead of strings that is! Granted, I'm still at the level where optimization is irrelevant but it's always fun to know!
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline pjt33
« Reply #3 - Posted 2012-08-06 19:13:17 »

Check out java.util.BitSet.
Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

atombrot (25 views)
2014-08-19 09:29:53

Tekkerue (24 views)
2014-08-16 06:45:27

Tekkerue (23 views)
2014-08-16 06:22:17

Tekkerue (13 views)
2014-08-16 06:20:21

Tekkerue (20 views)
2014-08-16 06:12:11

Rayexar (58 views)
2014-08-11 02:49:23

BurntPizza (38 views)
2014-08-09 21:09:32

BurntPizza (30 views)
2014-08-08 02:01:56

Norakomi (37 views)
2014-08-06 19:49:38

BurntPizza (67 views)
2014-08-03 02:57:17
List of Learning Resources
by Longor1996
2014-08-16 10:40:00

List of Learning Resources
by SilverTiger
2014-08-05 19:33:27

Resources for WIP games
by CogWheelz
2014-08-01 16:20:17

Resources for WIP games
by CogWheelz
2014-08-01 16:19:50

List of Learning Resources
by SilverTiger
2014-07-31 16:29:50

List of Learning Resources
by SilverTiger
2014-07-31 16:26:06

List of Learning Resources
by SilverTiger
2014-07-31 11:54:12

HotSpot Options
by dleskov
2014-07-08 01:59:08
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!