User talk:Voidious

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Revision as of 22:35, 23 August 2009 by Rsim (talk | contribs) (just a thought)
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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)

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)