Archived talk:User:Voidious 20110909

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Point2D Help

Hey. I'm trying to debug my Anti-Gravity Movement I'm working on implementing into GITS. I'm trying to draw a circle with Point2D, but I can't get it to compile. The code I'm using is drawCircle(java.awt.Point2D.Double, int, java.awt.Color);. I just want to know if I'm doing it right. Thank you --HACKhalo2 19:47, 21 May 2009 (UTC)

Hey dude - I'm guessing you saw that method in Dooki's I derived my drawing code from User:David Alves' DrawingBot (not migrated yet, see David_Alves/DrawingBot), which is similar to User:Nat/DrawingBot. Basically, you would need something like this to support that call:

private static Vector _renderables = new Vector();

public void onPaint(Graphics2D g) {
    Iterator i = _renderables.iterator();
        Renderable r = (Renderable);

public static void drawCircle(Point2D.Double center, double radius, Color color){
    _renderables.add(new Renderable.Circle(center, radius, color));
} the Renderables class from DrawingBot (linked above). Does that help / make sense? --Voidious 20:08, 21 May 2009 (UTC)


Hey, thanks for fixing all those redirects. I never knew that you had to do that to remove them from the category listings. --AaronR 03:17, 12 November 2007 (UTC)

Misc Chatter

Why not you run more TwinDuel now? I'd like to participated it. --Nat 07:50, 4 January 2009 (UTC)

Hey, have you read my message? Look here » Nat | Talk » 09:24, 25 March 2009 (UTC)

So I see Nat said he'd be interested in the TwinDuel - is anyone else still interested? If I recall correctly, I needed to update my automation for newer versions of Robocode, but that shouldn't be a problem when I get some time. I've definitely been getting the itch recently to do some real Robocoding again, but I'm afraid that if I start, none of the rest of the wiki migration stuff will ever get done. =)

And whether just for TwinDuel or for some active Robocoding, I really need to either explore this "Soy Latte" version of Java 6, or find another machine to work on, as I've come to accept that I will never see Java 6 on my Mac. =(

--Voidious 14:58, 23 April 2009 (UTC)

Thanks for reply. I think I add that comment very first day on this wiki ;D I don't really think the migration stuff will never finish even you start robocoding again. I'm currently take a pause from developing robot for migration work (and few other reasons) But, do you think I should finished Challenge 2K9 before start my own migration work? Does robocode require Java 6? » Nat | Talk » 15:23, 23 April 2009 (UTC)

I don't know, I think that's up to you about Challenge 2K9. I haven't really read all the Challenge 2K9 info yet, but I'll try to soon. No, Robocode doesn't require Java 6, but some people use Java 6 in their TwinDuel bots, and it feels silly at this point to require people not to use Java 6 just because I don't have it on my Mac! --Voidious 15:54, 23 April 2009 (UTC)
If you have time, please help me doing the thing on Komarious. I want it to controlled distance at 450 (using Dookious AgressiveDistanceController), surf non-firing wave (rolled at 1, weight 1/6), surf hit (rolled at 0.8, weight 2), surf visit (rolled 1, weight 1) from Komarious 1.78 please? Thanks. » Nat | Talk » 16:08, 23 April 2009 (UTC)

I used SoyLatte successfully until I upgraded to Leopard (which has an optional 1.6 install). Let me know if you ever want to integrate TwinDuel into the rumble. --Darkcanuck 15:35, 23 April 2009 (UTC)

Wow, cool, thanks for the info! I definitely heard of a developer beta at some point, but I think it was only for 64-bit processors, and I'm still on a 1st gen MacBook. Looking to upgrade soon, though, so maybe Java 6 is one more thing I can look forward to there. =) --Voidious 15:54, 23 April 2009 (UTC)
You're probably right about 64-bits -- mine's one of the first 64bit models. Buy SoyLatte worked great under X11 last time I tried. --Darkcanuck 16:41, 23 April 2009 (UTC)
And a TwinDuel rumble sounds very appetizing! The scoring is the only kind of weird thing, since it's survivalist, ignores total score, and is 75 rounds. If we could make the ELO + Glicko + PL stuff look at % rounds won instead of % total score, that would seem more "right" to me. But even just a 2v2 team battle on an 800x800 battlefield with all the normal scoring could be cool, too, if all of the "weird scoring" is a problem. --Voidious 15:54, 23 April 2009 (UTC)
(Edit conflict) I'm curious, can roborumble client handler the 2000-bytes thing? And will 75 rounds take too long on the client? I don't know really that will anyone run battle for it. MeleeRumble and TeamRumble get only little battles before Deewiant come along with melee rumble, then GrubbmGait start to run team rumble. » Nat | Talk » 16:01, 23 April 2009 (UTC)
We would have to modify the client to add the new game type and maybe work out a modified version of scoring. The new server does have a % survival scoring option though. With a low number of participants, it wouldn't require much client processing time (less than melee rumble for sure). --Darkcanuck 16:41, 23 April 2009 (UTC)

Do you have any planned with any of your robots now? Dookious hasn't been updated for an ages. » Nat | Talk » 14:08, 12 May 2009 (UTC)

Well, rest assured that I'm working on something. =) I'm not sure when it will be released, maybe a couple more weeks? As for my existing bots, I don't have specific plans, but they have all been on my mind. I will definitely get back to Dookious sometime -- I can't let Skilgannon have all that fun all by himself. --Voidious 14:20, 12 May 2009 (UTC)

Testing e-mail notification when I edit a page on my watchlist.... --Voidious 23:08, 22 July 2009 (UTC)

The page Special:AllMessages isn't accessible. Just FYI, I don't think I need to use it. And the only solution is to increase the PHP's memory_limit. I always set to unlimited (0) on my machine and on my host (well, I don't really care if the script stole other site that hosted on the same server memory), but you have, let see, 256MB of RAM? Are you still using David Alves' server or the Vic's one (the old server)? » Nat | Talk » 14:45, 23 July 2009 (UTC)

Hey, I see that you're on the wiki right now; could I get your opinion on whether my nanobot SavantWS is a real wavesurfer? So far I've got one yes and one no, and you've been wavesurfing for longer than most of us. I'd like to hear what you think about it--CrazyBassoonist 01:56, 31 July 2009 (UTC)

Just a quick note that I've disabled the "rollback" link for sysops, so I won't be accidentally clicking it any more... sorry about that. --Voidious 18:59, 8 September 2009 (UTC)

Hi, thanks for the welcoming message, im not used to using Wiki other then reading it, so excuse me for poor formatting.
I will post some information when i've figured that out haha.
Anyway, Any chance you are on IRC somewhere? could use input for my second bot tho.

Hey, no problem, I think we all learn as we go with this wiki stuff. I don't use IRC much, but I'm on AIM (Voidious) and Jabber/GTalk (my handle at But the wiki is also a good place to post questions where more people will see them. You could post on the appropriate talk page or just on your own and people will see it on Special:RecentChanges. --Voidious 19:28, 11 September 2010 (UTC)

Hi again, i have a question for you (if you dont mind), i did read about bullet shielding and made the code for it,
now when they collide, there isnt anything happening? (no matter what power i use, lower, equal or higher) they go straight trough each other haha..and i mean really through each other centre's
Any idea if this has been taken out or something?

Well, I haven't really done any bullet shielding myself... But I know that each tick, a bullet is a line segment between where it started and ended on that tick. When two of these line segments intersect, that is a bullet collision. If you have two bots just sitting still and shooting right at each other, the bullets will not collide (probably rounding errors so they are parallel and super close), though it seems like they should. Does that help? Or you know that and they still aren't colliding? --Voidious 15:48, 15 September 2010 (UTC)

Thanks for the help Voidious! If you are interested, have a look at the final result: CirclingBot --Hapiel 20:43, 16 January 2011 (UTC)

Happy Birthday! (I think) --Nat Pavasant 07:01, 8 April 2011 (UTC)

Happy Birthday indeed, I think :P --Rednaxela 01:06, 9 April 2011 (UTC)

Indeed it was - thanks guys! :-) --Voidious 13:21, 9 April 2011 (UTC)

Segmenting Help

I WILL NOT GIVE UP! I'm going to keep trying! I need a bit of help. I understand wave surfing much better now because of the tutorial you made. Thanks! In the GuessFactor Targeting Tutorial, it teaches you what to change to segment it. Very useful. I've segmented my GF gun with distance, velocity, etc. already. However, I only see part of what I have to change in the wave surfing code. Could you give a simple example in the tutorial to help me? Thanks. -- User:Awesomeness

Sure, here's a real simple example. Let's say you want to segment your surf stats on distance. Let's go real simple and just segment into "distance < 300" and "distance >= 300".

  • In your instance variable declarations:
    • public static double _surfStats[] = new double[BINS];
    • becomes public static double _surfStats[][] = new double[2][BINS];
  • You need to track distance at fire time in your EnemyWave class now.
    • In the EnemyWave class definition, add double distance;
    • In onScannedRobot, where you detect the bullet and initialize the EnemyWave class, add ew.distance = e.getDistance();
  • In logHit:
    • _surfStats[x] += 1.0 / (Math.pow(index - x, 2) + 1);
    • becomes _surfStats[ew.distance < 300 ? 0 : 1][x] += 1.0 / (Math.pow(index - x, 2) + 1);. (That's an inline if/else statement, you don't have to do it like that if you don't want. Just need to use 0 or 1 for the first array index, depending on the distance.)
  • Similarly, in checkDanger:
    • return _surfStats[index];
    • becomes return _surfStats[surfWave.distance < 300 ? 0 : 1][index];

Basically, any information you want to segment on, you would store that information in your wave class. Then whenever you access your _surfStats, you use that data to come up with the array indexes. Effectively, you end up with a bunch of surfStats[] arrays, one for each situation (segment). Make sense?

--Voidious 01:05, 7 May 2009 (UTC)

There is another way doing this. I'm not using that way because it more complex. I use the magic of reference to do the thing similar to the one in GuessFactor Targeting Tutorial:

  • In your instance variable declarations:
    • public static double _surfStats[] = new double[BINS];
    • becomes public static double _surfStats[][] = new double[2][BINS];
  • You need to reference the new segment in your enemy wave now.
    • In the EnemyWave class definition, add double[] stats;
    • In onScannedRobot, where you detect the bullet and initialize the EnemyWave class, add ew.stats = _surfStats[e.getDistance() < 300 ? 0 : 1]; (That's an inline if/else statement, you don't have to do it like that if you don't want. Just need to use 0 or 1 for the first array index, depending on the distance.)
  • In logHit:
    • _surfStats[x] += 1.0 / (Math.pow(index - x, 2) + 1);
    • becomes ew.stats[x] += 1.0 / (Math.pow(index - x, 2) + 1);.
  • Similarly, in checkDanger:
    • return _surfStats[index];
    • becomes return surfWave.stats[index];

(copy from yours, Voidious) This way if you are adding more segment, you just need to change only one place (vs. 2 places). Actually I done the ew.stats = _surfStats[ew.distance < 300 ? 0 : 1]; thing in constructor of EnemyWave class (by assigning the data to the global variable first of corse). » Nat | Talk » 15:13, 7 May 2009 (UTC)

Time to upgrade

Hi Voidious. I think the upgrade time has come. Please upgrade soon. Thanks. I know you are backing the database up, but first you need is "Wiki Lockdown" or your backup will never present. » Nat | Talk » 15:21, 7 May 2009 (UTC)

Soon. =) Probably tomorrow, as I'll be on the away from the computer this evening. --Voidious 15:50, 7 May 2009 (UTC)

public class EnemyWave

Awesome basicsurfer tutoral.

Could you edit class EnemyWave to be public class EnemyWave? APIs freak out otherwise.

Thanks! —Preceding unsigned comment added by Mageek (talkcontribs)

You can changed it yourself. Robocode's robots don't need API, their classes cannot be used outside (unless you count when someone copy it over). » Nat | Talk » 08:27, 23 May 2009 (UTC)

I'm not sure what you mean by "APIs freak out"? You could define it differently, eg as a public class in its own file, but it worked fine as it is last I checked. If there is some reason it should be changed, though, I'm all for it... Glad you liked the tutorial, good luck! Feel free to make a page for yourself and tell us about your bots. --Voidious 19:06, 23 May 2009 (UTC)

Robot's Image

Voidious, I'm wondering why do you uploaded those images (File:Phoenix3.jpg & File:Silversurfer05.jpg)? It seems to be robot's image. But you didn't migrate those pages (Phoenix & SilverSurfer) » Nat | Talk » 15:53, 14 July 2009 (UTC)

It is because I intended to migrate the pages, I just haven't actually done it yet. =) They are the most wanted pages right now. --Voidious 17:01, 14 July 2009 (UTC)

User welcoming

Hi Voidious, I noticed that lately you also welcome all new robocoders (usually after I insert that template) in your own test that mean the same. I wonder why don't you make changes to the template {{Welcome}}, you are welcome to use it to welcome people instead of your writing. The usage is describe on its page. This is applied to all other Robocoders who might read this too.

It just feels a little more personal to me. It's not like we get that many new users, I can take a minute to say hi. =) Your welcome template is fine, too, it contains some good information. --Voidious 17:37, 16 July 2009 (UTC)

You can post both the template and personal welcome. I sometimes did that too. I'm not 24/7 robot so I'm not active all the time. OK, all I asked is that when you welcome users using your own text and I haven't put that template on yet, you are very welcome to put that template in (on? which preposition to use here?). Thank you in advance. --Nat

Ok, will do. As for correctness, I think "to put that template onto the page" would be technically correct, but if you leave out "the page", then "to put that template in" sounds right to me, though "on" does not sound wrong. I'm not sure I can even explain why -- English is really weird. --Voidious 14:18, 17 July 2009 (UTC)

Thank you. I did go over my sheet on preposition several time and can't find the right one. So you see why I am not sure which one to use. Both "in" and "on" don't sound wrong... You may noticed that I use both "on" and "in" in that sentence, bad I know. » Nat | Talk » 14:27, 17 July 2009 (UTC)

Rumble Help

Voidious, since you've been so helpful... I created a new version without the faulty call. I've uploaded it to the repository, deleted the old one, and changed the participants in the wiki to point to the new one (1.1 version). But the server keeps using the old one? Am I doing something wrong? Thanks! --Borkstation 13:15, 17 July 2009 (UTC)

The rumble clients update its list every 2 hours, and the server will allowed clients to remove the bot after four hours of no updates. You need to wait for about an hour more to watch the result. » Nat | Talk » 13:19, 17 July 2009 (UTC)

Yeah, as Nat said, a running rumble client only updates its list every 2 hours or so. Also, once a bot has a certain number of battles (50 I think?), the server will try to run battles for it until it completes all its pairings, even if it is removed (so it might run both versions until then). I see my client (which I just fired back up) is running BoxCar 1.1, so it should be getting steady battles at this point. --Voidious 14:27, 17 July 2009 (UTC)

Thanks guys. I'm really just getting started and trying to create a bot that doesn't stink before I jump into anything complicated. You've all been a great help. --Borkstation 15:24, 17 July 2009 (UTC)

Upload directory not writable

Old problem arise, I can't upload again =( » Nat | Talk » 04:21, 19 July 2009 (UTC)

Ok, could you try again please? --Voidious 04:25, 19 July 2009 (UTC)
Thanks, fixed. » Nat | Talk » 04:33, 19 July 2009 (UTC)


Hey Voidious, have you change the server? It seems that the memory_limit PHP configuretion is lower than it used to be. I got PHP's fatal error when I tried to add the header to Shadow's archived talk page. I must use dummy header to successfully add them. Please fix soon, remember that MediaWiki need at least 96MB. » Nat | Talk » 12:10, 25 July 2009 (UTC)

wget on

Heya Voidious, is it known/intended that trying to do a wget on fails with a 403 error while using firefox or the rumble client does download it successfully? Doesn't really matter but it did leave me in confusion for a moment :) --Rednaxela 05:47, 6 August 2009 (UTC)

No, not known nor intended. I didn't even know what "wget" was until this morning. =) I'm curious now, though, so I'll look into it when I get a chance (if I can remember)... --Voidious 13:07, 6 August 2009 (UTC)

Modifying Diamond question

Hey Voidious, I guess it's okay, but I feel it's proper to ask: Do you mind if I turn off some debugging graphics (the t-... thing) in Diamond and use it as a wavesurfing demonstration in a youtube video? :) --Positive 20:29, 14 August 2009 (UTC)

Of course not! =) You may have already seen, but there are variables in the gun, radar, and movement classes to disable all graphics within that class. --Voidious 20:37, 14 August 2009 (UTC)
Here you go :).

Re: "stupid #@$% iPhone"

I know your pain. The autocorrect when typing is also a pain when typing rarely typed acronyms :) --Rednaxela 15:11, 15 August 2009 (UTC)

Hehe. Yeah, I adore my iPhone, but sometimes the browser wigs out and totally clicks the wrong place - I think it's scrolling before noticing the click or something, as the touch is usually super accurate. I wish reverting edits required confirmation, too, as I've done that several times now. I hear ya on the autocorrect, but I must say it's pretty cool that it has learned (and even suggests) my favorite swear words now. =) --Voidious 15:17, 15 August 2009 (UTC)

You can always create another user for admin and remove sysop right from your username. That will cause the rollback link to disappear I believe =) Just kidding. (Note: but it will disappear) » Nat | Talk » 16:38, 15 August 2009 (UTC)

Wierd scores

Hi Voidious! I'm glad you liked my bot. However i'm thoughtful about why your own bot is performing so much better on your own computer then everyone elses. Check the stats page:

On your client my bot scores about 40% while on other clients my bot scores >70% --Rsim 18:27, 15 August 2009 (UTC)

Hmm, I have no idea. It could just be luck, that's only a few battles. I'll try running some more battles between them with and see what happens. --Voidious 18:33, 15 August 2009 (UTC)

Ok, 25 battles on my main machine (MacBook, SoyLatte Java 6) had a range of 53-85% and an average of 69%, BulletCatcher winning. But on my Linux box (OpenJDK 6), Komarious wins with ~70%. Maybe there is something about Robocode's bullet collision that is JVM dependent? Is anyone else on Linux that could give this a try? --Voidious 18:50, 15 August 2009 (UTC)

You could try a more controlled experiment on your machines by running the same start positions and random seed on both machines. In theory you should get an identical result on both? --Darkcanuck 19:00, 15 August 2009 (UTC)
I've never done that before... Any pointers on how I'd go about configuring that? The scoring discrepancy between the two is large and consistent enough that I'm already convinced there is one, but it would still be a good test. --Voidious 19:06, 15 August 2009 (UTC)
Never done it myself, but I think it's what Fnl uses for testing and also how the engine handles replays. I know there's a command-line option -DRANDOMSEED (from the robocode.jar usage text) to preset the random number generator. And if you run using a saved battle file there's a property called robocode.battle.initialPositions that lets you set the initial positions and headings (although I'm not sure of the syntax/format). --Darkcanuck 19:29, 15 August 2009 (UTC)

Hmm... the nature of BulletCatcher leads me to believe that this discrepency is due to a CPU or JVM dependent rounding error perhaps... Hopefully we can get this sorted out --Rednaxela 20:31, 15 August 2009 (UTC)

Having BulletCatcher in Voidious excluded list would make me happy while this is beeing sorted out :) --Rsim 20:44, 15 August 2009 (UTC)

No problem, done. --Voidious 20:48, 15 August 2009 (UTC)

To compare, my computer shows BulletCatcher averaging 73.25% over 8 matches, using Sun JVM 1.6.0 on Linux. I'll test with OpenJDK in a moment. --Rednaxela 20:57, 15 August 2009 (UTC)

Over 8 matches with OpenJDK 6 on Linux, the average is 74.5% in favor of BulletCatcher still. Whatever this issue is, it's neither the fault of OpenJDK 6, Linux, or Robocode Maybe the processor on that box has a rounding bug issue or something? I don't know what else to think. --Rednaxela 21:29, 15 August 2009 (UTC)
I'm still seeing mostly Komarious wins under the Sun JVM 1.6.0, but with 50-60% scores, compared to the 70-80% scores I see under OpenJDK. There's definitely a difference between them on this machine. I switched to OpenJDK because I suspected the Sun JVM was responsible for the machine crashing, and indeed it seemed to be more stable immediately upon switching to OpenJDK. But I guess I'll switch back to the Sun JVM for now (and cross my fingers). Still excluding BulletCatcher, though. It's Ubuntu 8.10 on an AMD2000+, if that means anything to anyone.
I'm getting a new computer in the next week or so, so the old Linux box will become almost negligible in my total rumble power. Maybe I'll just throw it out the window at that point. =)
--Voidious 21:36, 15 August 2009 (UTC)
Update: the machine totally crashed sometime yesterday after 30-40 days up-time, so I do believe it's the Sun JVM's fault (at least in part). --Voidious 14:20, 18 August 2009 (UTC)
Did you check the scripts? I once had a similar problem and I had 256MB for heap size on one of the script files. --zyx 22:11, 15 August 2009 (UTC)
Good idea, but I just double-checked all three (Robocode, roborumble, meleerumble) and they all use 512 mb. --Voidious 22:14, 15 August 2009 (UTC)
This could be related to this --Rsim 21:35, 23 August 2009 (UTC)

Faulty Score

I detected battles where your machine reports wired scored:

For other battles involving GeomancyBS 0.11 you report reasonable scores (I think), could you check what's wrong with the battle against TheBrainPi? (note that this should not be releated to the issue above as i changed the line-intersecting code to be VM independent.) --Rsim 18:36, 4 September 2009 (UTC)

I am checking it out now. I think TheBrainPi throws exceptions sometimes, so maybe that is causing the issue. Also, just FYI, the above problems were only on my Linux RoboRumble box, which I'm not running any more, anyway... --Voidious 18:40, 4 September 2009 (UTC)

Here's what I'm seeing. The first round, GeomancyBS sheilds 3 bullets, then TheBrainPi gets disabled with the following:

apv.TheBrainPi 0.5: Exception: java.lang.NullPointerException
	at apv.nrlibj.NNet.frwNNet(
	at apv.TheBrainPi.aim(
	at apv.TheBrainPi.onScannedRobot(
	at robocode.peer.robot.EventManager.onScannedRobot(Unknown Source)
	at robocode.peer.robot.EventManager.dispatchEvent(Unknown Source)
	at robocode.peer.robot.EventManager.processEvents(Unknown Source)
	at robocode.peer.RobotPeer.execute(Unknown Source)
	at robocode.peer.proxies.BasicRobotProxy.execute(Unknown Source)
	at robocode.AdvancedRobot.execute(Unknown Source)
	at Source)

GeomancyBS sits there (waiting for next bullet?) and eventually gets disabled for not doing anything, and they both die. Every round after that, TBP hits the above NPE before firing, and GBS just sits and also gets disabled. Maybe you need a clause to just fire 3.0 bullets at a disabled opponent?

--Voidious 18:46, 4 September 2009 (UTC)

Yes, it probably should (i though it did). But the strange thing is that apv.TheBrainPi works flawlessly on my machine and doesn't throw any errors at all. Thanks for investigating it! --Rsim 18:56, 4 September 2009 (UTC)

Out of curiosity, are you seeing that every single time with TBP Voidious? Or is it only sometimes? --Rednaxela 19:28, 4 September 2009 (UTC)

Against everyone, it looks like -- I tried Raiko, Duelist, and Infinity, and I tried both SoyLatte (my normal JVM) and the Apple JVM with the same results. This is in Robocode --Voidious 19:36, 4 September 2009 (UTC)

I decided to do some more investigation of this. First, it looks like most of TBP's zero scores have come from me, but a few have also come from Darkcanuck: [1], [2], [3]. More importantly, though, I remembered that TBP saves its NN info between matches, and uses the same data against every bot (as if all opponents are just one opponent). So I thought maybe TBP had somehow corrupted its own NN data. I tried clearing the data directory and reloading the bot, and indeed, he works fine after that. I'm not sure what to do about this... obviously, it's not fair to make everyone watch out for this and baby-sit their data directories because of a buggy bot, but I also feel bad removing it (especially since Albert is the father of the RoboRumble). Thoughts? --Voidious 20:04, 4 September 2009 (UTC)

That is indeed an emotional situation. Maybe we could make a fix version, as it was done with SilverSurfer (although reasons are different) and just try and catch that exception you posted, if it happens force a clean on the data. If people agree I wouldn't mind checking if I can fix it. --zyx 20:13, 4 September 2009 (UTC)
Sounds like a good idea to me. I vote for this --Rsim 20:18, 4 September 2009 (UTC)
Yeah, that's a great idea. I didn't think TheBrainPi was open source, but it is. Just FYI - TBP actually comes with some pre-loaded data (my test above included restoring those files), but seems to work fine starting from a clean data dir, so your proposed fix should work. --Voidious 20:30, 4 September 2009 (UTC)

I was looking how hard/easy would that fix be. I easily tracked down a good place to put the fix in and when I tested my fix I realized the File.delete() method was returning false(didn't delete it successfully), some reading on the web of when that happens made me realize he isn't closing the file after reading. If I add the close call to his reading method, then my delete fix works properly. But now I'm thinking that maybe the corruption comes from not closing the files after reading, so I will add the call to close and leave the delete fix, but I will print to the console whether the delete part ever happens, hopefully it will never have to actually the files. --zyx 20:57, 4 September 2009 (UTC)

Choice of license

I've been giving serious thought to changing what source code license I use for my bots. It's been a long time since I decided on RWPCL, and my views have evolved a bit since then. A few things recently (including Rednaxela opting for zlib, and this article about a graphics engine going from LGPL to MIT) have gotten me thinking hard about why I open source my bots, and in turn, what license best fits those goals. There are 3 main reasons I open source:

  1. To give others the opportunity to learn from my code in the same way that I have been able to learn from so many other bots and people on this wiki.
  2. To contribute to the collective advancement of Robocode bots.
  3. To encourage others to open source their bots.

The RWPCL certainly contributes to all of these points, but I think it may put undue weight on #3, when I actually care a lot more about #1 and #2. And if a more permissive license would result in more people using/learning from my code, that might contribute to #3 more than a Copyleft license's restrictions. I'm considering RWLPCL or something like zlib or MIT. I already have a good idea where some of you stand, but I'd really appreciate hearing what you guys think about this topic. Thanks,

--Voidious 18:16, 25 September 2009 (UTC)

Yeah, similar reflection on why I open source my bots is what led me to decide on a slightly slimmed/modified zlib licence for my kd-tree. In the future (i.e. with Glacier), I'm considering doing a practice of using a somewhat restricted licence (look at the code, learn from it, but don't copy-paste and release it without asking) for unique behavioural parts of the bot like targeting/movement, but using a permissive licence (i.e. slimmed/modified zlib) for all utility code (which seems to make up over half of my bots lately). I don't mind people reusing my code, but I'd use the more restrictive licence on the unique behavioural parts in order to encourage people to do their own thing. If people ask I'd be very open to either changing particular classes to a permissive licence or giving case-by-case exceptions. As I see it, that would be best for allowing people to learn from my code, use useful utility classes they come across, but encourage innovation. Also, for nanos/micros I'd probably just go fully in a permissive licence since it's so small anyway, I'm mainly talking about megas here. That's my position and those are my current plans anyway, as far a the licence of my bots is concerned. --Rednaxela 18:52, 25 September 2009 (UTC)

My thoughts exactly =) I like to provide my code as a reference implementation, but it needs to be clear that it's the idea behind the code that is important for people to grasp, not the code itself. If people want to use parts of DrussGT, CunobelinDC, Toorkild or Wintermute that make them the unique bots they are, then I really would prefer if they either 1) ask first or 2) make their own implementation based on the concept of what my code is trying to achieve. If there's a licence that provides this I'd happily use it, I'm just mostly too lazy, and too legalese-phobic, to go looking. --Skilgannon 19:24, 25 September 2009 (UTC)

You're probably right Voidious that RWLPCL contributes more to the community than RWPCL. Otoh you want to share your ideas and some utilities, not the complete source. For my bots the license is not that important, as they do not contain any unique code. --GrubbmGait 22:28, 25 September 2009 (UTC)

Skilgannon said exactly my thoughts. I like to share my code so people can learn stuff from them but I don't want them to just copy out of them, but laziness and fear to get too legal about it makes me stay away from licenses. I just want to enjoy Robocode as a very fun game, so I prefer to have no license and let people copy from it than search for an appropriate one and worry about it being violated. At the end I think is their loss if they don't implement it themselves as that is exactly what I enjoy doing. But if this conversation leads to a license that expresses that, I'd happily go for it. --zyx 03:34, 26 September 2009 (UTC)

Thanks guys, I really appreciate all the input. My ideal vision for how others would use my source code is exactly the same as all of yours. What I'm not sure about is whether I want to, or even can, enforce that with a restrictive license. At what point does someone "truly understand" my code? Do they really need to understand it to be able to build innovations on top of it? There are many parts of Java's libraries that I don't fully understand, but I still use them as building blocks - how is that any different?

Another part of my thought process is that a license restriction is not going to stop someone who really wants to steal my code without giving credit. But it may stop other uses that I would be OK with, such as someone with a closed source bot releasing a test/hybrid bot with my movement, to compare the guns. Kind of along the lines of, "if you outlaw guns, only the outlaws will have guns". In my mind, as long as credit is given, even copying large portions of another bot is not necessarily a bad thing in every circumstance (though I personally wouldn't enjoy doing so). I'm leaning towards RWLPCL right now (basically, "just give credit"), but I'm still thinking it over. --Voidious 04:12, 26 September 2009 (UTC)

I think we all have almost the same thought on this. How about my NPRL ? (I should remove the first rule of that license) Basically, it is RWLPCL with some extra to control the use and improvement of the source code (much like RWLPCL + Skilgannon's license)

I don't think you need to fully understand the code before you can use it. Of course, by truly understand it you are able to use it better, but if you don't doesn't mean you can't. Such as when I first implement wave surfing, I never understand what the predictPosition() do in BasicSurfer, but I know what it is and what is it use for (like how you understand the Java's libraries). That's enough for me create wave surfer. And what point is to 'truly understand' the code? I say, when you are able to provide the pseudo-code for it. I mean, I think can provide you how Simonton's nano PM gun work, but I can't really make them nano-size. Nat Pavasant 07:52, 26 September 2009 (UTC)

I agree with everyone who responded to you. Perhaps licenses for different source files work best (like Rednaxela suggested), so people can use your utilities but don't copy what makes your bots so unique. Also, I'd like it if I could use your surf wave graphics, they're so damn cool. :) --Positive 21:13, 26 September 2009 (UTC)

Dookious vs. Horizon

Hey, Voidious, it looks like Horizon is back to beating Dookious. And this time, it's doing it legitimately ;). « AaronR « Talk « 11:47, 24 October 2009 (UTC)

Wow, nice work! Dookious is tough. Your win/loss record looks really weird to me. You also beat Pris, while Pris completely destroys Diamond, but you lose to Diamond and quite a few weaker bots. My first thought is that your flattener might be turning on too often, and your version history seems to corroborate that. I think you'll be in really good shape once you tune that a bit! --Voidious 16:49, 24 October 2009 (UTC)

Thanks! The heuristic I tried was the simplest one I could think of, so it's no surprise that the flattener turns on at the wrong times. I just wanted to get this out there to see how it does. « AaronR « Talk « 00:04, 25 October 2009 (UTC)
Just an observation, DrussGT usually loses to Raiko in the 2nd or 3rd round, after Raiko disables the Musashi Trick and uses his VERY strong random movement. --Skilgannon 14:10, 25 October 2009 (UTC)

Recent hiatus

I have been consumed by Quake Live since last October, which is most of the reason for my Robocoding hiatus since then. Also did NaNoWriMo in November. I'm still checking the wiki and even done some Robocoding here and there, but nothing that's led to an actual new version. Figured it's been long enough that I wanted to post an explanation. =) --Voidious 16:11, 19 January 2010 (UTC)

Happy Birthday

Happy Birthday Voidious! Hope you have good day and have fun! May the surfboard be with your jewellery =) --Nat Pavasant 08:50, 8 April 2010 (UTC)

Thanks dude. =) Never heard that expression before... not sure I understand. ;) --Voidious 20:54, 8 April 2010 (UTC)

Happy birthday indeed! Haven't heard that expression either, interesting. --Rednaxela 21:02, 8 April 2010 (UTC)

Sorry, so caught up with my latest releases I must have missed it. Happy birthday man =) --Skilgannon 05:19, 9 April 2010 (UTC)

Explanation: As your name 'Voidious' came from Star War series, I adopted the sentence 'May the force be with you.' Surfboard == thing use for surfing && jewellery == Diamond =) --Nat Pavasant 08:45, 9 April 2010 (UTC)

I know I'm a little late, but here it goes: happy birthday! --Navajo 13:28, 9 April 2010 (UTC)

Well, I hope you had a good day yesterday. Our birthdays are a day and likely a few years apart. Today I turned 37. Poker party at my house tonight. --Martin 15:35, 9 April 2010 (UTC)

(Happy birthday to you too then Martin! Have fun :P --Rednaxela 15:45, 9 April 2010 (UTC))

Thanks dudes. And yeah, Happy Bday to you too, Martin. Sounds like you prolly had more fun than I did. ;) --Voidious 23:23, 10 April 2010 (UTC)

Some kind of change in the last year?

Has something changed about the act order on bots in the last year?

My students and I just worked together to produce linear targeting with the Law of Sines, etc.. and the gun consistently fires behind the target. Interestingly enough, this exact code last year worked perfectly, and bots from last year are suddenly missing Walls!

One of my students' bots works perfectly though.... same code as everyone else wrote. This is very vexing! - Tkiesel 19:08, 18 November 2010 (UTC)

I don't think so, but then it's not like I've tested it lately. You could grab from here if you want to test it explicitly: [4]. How far behind the target? I ask because even if it had changed, it would probably be an off-by-1 error and still hit Walls pretty well... You could also try WaveSurfingChallengeBotB from WSC2K6 reference bots, that uses a solid linear targeting. --Voidious 19:23, 18 November 2010 (UTC)


Just curious, I wonder if Henryark and Lucabb is the same person? --Nat Pavasant 01:51, 11 March 2011 (UTC)

I know the IPs are different for sure, since the ban included an ip block on account recreation both times. Also, spambots rather than persons I'd think. It's seeming that the captcha is not adequate anymore I guess? --Rednaxela 05:29, 11 March 2011 (UTC)

Due to the timing difference, I believe it is human who register the account. Is the account from the public proxy or from the same subnet? Maybe we can block on subnet basis? --Nat Pavasant 02:25, 12 March 2011 (UTC)

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