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Mwa Ha Ha!

I just did something absolutely brilliant which squeezed 14 bytes from the GFT system itself, and I now have 18 bytes free, plus ~9 bytes if I get desperate. Any ideas about what I should do with that space?

Sheldor19:41, 1 May 2013

Huh, it seems it wasn't so brilliant after all. Version 1.9.0 is ~0.5 APS lower than 1.8.0.

The main change was to the way the wave system gathers bearing offsets. Version 1.8.0 used the traditional, coordinate-based method, whereas version 1.9.0 sums angular velocities. I made sure to keep it as precise as I could, I even adjusted the distance by which I divide the lateral velocity to calculate angular velocities with advancing velocities (actually negative advancing velocities, you might call them "retreating velocities") to account for the opponent moving toward or away from the source location of the wave.

Is there some obscure element of Robocode physics that makes sums of angular velocities inaccurate? Or is there a bug in my code?

Sheldor01:57, 2 May 2013
 

Don't think anything about Robocode itself should lead to an inaccuracy. Could it be a normalization bug? When normalizing angles, an individual angle is equivalent no matter how it gets normalized, but if you're summing or averaging them it can screw things up. E.g., average of {2.9, 3.0, 3.1, -3.1, -3.0, -2.9} is 0, but you'd want the result to be something more like pi.

Voidious03:23, 2 May 2013

Normalization should be irrelevant because everything is already relative.

I might be on to something though. I'm wondering if the inaccuracy is coming from the original absoluteBearing being used to calculate LV and AV. Should it be updated with angular velocities?

Sheldor04:05, 2 May 2013
 

You'd need to keep a list of the positions you were in and backtrace the enemy movement until the wave could originate at your location - a sort of backwards wave, as it were, otherwise you are getting the angular velocities from your current location, not from where you were when you wanted to fire. Also, are the indexes for the VCS calculated using the values from when you were firing, or when you are having the wave hit?

Skilgannon08:59, 2 May 2013

All segmentation is calculated when the wave is fired.

Why do you think I'm getting the angular velocities relative to EM's current location? I store the absoluteBearing from the tick in which the wave was fired, and both e.getVelocity() and e.getHeadingRadians() are absolute and shouldn't be relative to anything.

Thanks

Sheldor12:37, 2 May 2013

Ah, OK, looking at the source I see that you've still kept the wave structure, I thought you had completely gotten rid of it and then each tick look back to see what wave would hit now over the last N ticks of bullet flight time and retro-actively construct the wave from the conditions as they were then. What you've done isn't quite that drastic =)

As for what is different, have you tried projecting the point back into the cartesian plane and printing it to see if it is the same as the actual enemy location? How about using both types of tracking at once and seeing if they are giving the same results at wave-hit time?

Skilgannon13:22, 2 May 2013
 

Here is a sample of the console output from a match against Aristocles:

^^^ TEXT TRUNCATED ^^^
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Old Method - Tick: 520 - 0.28131803697981717
New Method - Tick: 520 - -0.060455259921373884
Old Method - Tick: 521 - 0.29290033395189496
New Method - Tick: 522 - -0.07502984289909014
Old Method - Tick: 522 - 0.2960367157168413
New Method - Tick: 522 - -0.29619178040319977
Old Method - Tick: 523 - 0.2899908526755475
New Method - Tick: 523 - 0.22169448823247304
Old Method - Tick: 524 - 0.2760204846278116
Old Method - Tick: 525 - 0.25577027201679137
New Method - Tick: 526 - 0.15245120142562935
New Method - Tick: 526 - -0.22812338529550522
Old Method - Tick: 526 - 0.22930969968853532
Old Method - Tick: 527 - 0.19668849565923807
Old Method - Tick: 528 - 0.16725117335496087
Old Method - Tick: 529 - 0.14110692751317888
New Method - Tick: 530 - 0.1412167984332873
Old Method - Tick: 530 - 0.10884652853130561
Old Method - Tick: 531 - 0.07964887886982464
New Method - Tick: 531 - -0.0810958634673436
New Method - Tick: 531 - 5.897452652249852E-4
New Method - Tick: 532 - 0.01902162842853444
New Method - Tick: 532 - -0.08149230223197829
Old Method - Tick: 532 - 0.05497008902185918
Old Method - Tick: 533 - 0.03326246412528633
New Method - Tick: 533 - 0.042695473939825736
Old Method - Tick: 534 - 0.014584881686217521
New Method - Tick: 535 - 0.020269013411352108
Old Method - Tick: 535 - -9.690074222916678E-4
New Method - Tick: 536 - -0.009596987690487153
Old Method - Tick: 536 - -0.022698811856896484
New Method - Tick: 536 - 0.01943110788083105
Old Method - Tick: 536 - -0.04758080623707883
Old Method - Tick: 537 - -0.06598990578246333
New Method - Tick: 538 - 0.018835370643752222
Old Method - Tick: 538 - -0.07467365319832098
New Method - Tick: 539 - -0.035456421395411754
New Method - Tick: 539 - -0.061056158782288504
Old Method - Tick: 539 - -0.08368798941205657
New Method - Tick: 539 - 0.04190673169846087
Old Method - Tick: 540 - -0.08311431685420168
Old Method - Tick: 541 - -0.07291687943394187
New Method - Tick: 542 - 0.05769422064795285
Old Method - Tick: 542 - -0.05643122097141684
New Method - Tick: 543 - -0.018503081588482
New Method - Tick: 543 - -0.04231620583648981
Old Method - Tick: 543 - -0.03374614546503585
New Method - Tick: 543 - 0.01682262513855787
New Method - Tick: 544 - 0.015501153805450427
Old Method - Tick: 544 - -0.0049686422443038225
New Method - Tick: 545 - -0.013208912037196915
Old Method - Tick: 545 - 0.029736782213975577
New Method - Tick: 545 - -0.012661903080969608
Old Method - Tick: 546 - 0.06999273507585069
New Method - Tick: 546 - 0.07214868477423399
New Method - Tick: 546 - -0.020117819029679622
Old Method - Tick: 547 - 0.11257498982935532
Old Method - Tick: 548 - 0.15675215836404144
New Method - Tick: 548 - -0.1670853333757256
New Method - Tick: 548 - -0.07283786682336481
Old Method - Tick: 549 - 0.19536375960979324
New Method - Tick: 549 - 0.23017212843685103
Old Method - Tick: 550 - 0.21875697269535332
Old Method - Tick: 551 - 0.2455376323052989
New Method - Tick: 552 - 0.0330083050561058
Old Method - Tick: 552 - 0.2694079618210987
New Method - Tick: 552 - -0.15564066699115975
Old Method - Tick: 553 - 0.2821507354130621
New Method - Tick: 553 - -0.2924143744002721
Old Method - Tick: 554 - 0.2824911546939428
Old Method - Tick: 555 - 0.27669062651924325
New Method - Tick: 555 - 0.26008665921713736
Old Method - Tick: 556 - 0.2637974319085832
New Method - Tick: 557 - 0.058142759064519475
Old Method - Tick: 557 - 0.2540467826384143
New Method - Tick: 557 - -0.1876115085104718
New Method - Tick: 558 - -0.24792638079509347
Old Method - Tick: 558 - 0.25454507966729545
Old Method - Tick: 559 - 0.2548703664537104
Old Method - Tick: 560 - 0.25525167048969966
New Method - Tick: 561 - 0.11600118570824959
Old Method - Tick: 561 - 0.26579890216887336
Old Method - Tick: 562 - 0.2761838593688304
Old Method - Tick: 563 - 0.2866128447908334
Old Method - Tick: 564 - 0.2969202811951328
New Method - Tick: 564 - -0.2740181388324343
New Method - Tick: 565 - 0.20634503267166837
Old Method - Tick: 565 - 0.30706624364667423
New Method - Tick: 566 - -0.25236612652453705
Old Method - Tick: 566 - 0.313222884543469
New Method - Tick: 567 - 0.3078270673958768
Old Method - Tick: 567 - 0.3095104990958406
New Method - Tick: 567 - -0.006545734643486848
Old Method - Tick: 568 - 0.2964133043472643
Old Method - Tick: 569 - 0.2774838827853665
Old Method - Tick: 570 - 0.2527009764430055
New Method - Tick: 571 - -0.25238054453759357
Old Method - Tick: 571 - 0.225218732731026
New Method - Tick: 572 - -0.10756332853954043
Old Method - Tick: 572 - 0.19497105677460125
New Method - Tick: 572 - 0.056675186941033164
New Method - Tick: 573 - 0.18615223915590853
Old Method - Tick: 573 - 0.16776538379857775
Old Method - Tick: 574 - 0.14356874905519912
New Method - Tick: 575 - -0.01570802316837205
Old Method - Tick: 575 - 0.12235173377070363
New Method - Tick: 575 - -0.08773334711104014
New Method - Tick: 576 - -0.025353454575477233
Old Method - Tick: 576 - 0.11345160768459284
Old Method - Tick: 576 - 0.11729707647375731
New Method - Tick: 577 - 0.09025584443520074
Old Method - Tick: 577 - 0.1213375185641854
New Method - Tick: 577 - 0.12665608972528775
New Method - Tick: 578 - -0.08232607243228518
Old Method - Tick: 578 - 0.12379969169013139
New Method - Tick: 578 - 0.05725009615201489
Old Method - Tick: 579 - 0.12578382144606914
Old Method - Tick: 579 - 0.11996712134001153
New Method - Tick: 579 - -0.1279624462458224
Old Method - Tick: 580 - 0.1093618815390105
New Method - Tick: 581 - 0.013063278883171225
Old Method - Tick: 581 - 0.0916042678944855
Old Method - Tick: 582 - 0.06690797876374832
SYSTEM: sheldor.micro.EpeeistMicro 1.9.0* has died
New Method - Tick: 582 - 0.06085342630254822
New Method - Tick: 582 - -0.06258786528602456
Old Method - Tick: 582 - 0.04657607501171923
New Method - Tick: 582 - 2.8660691268322675E-4

Obviously, something isn't right. Could this be some kind of event timing error? Like how energy drops are always detected two ticks late?

Sheldor15:01, 2 May 2013

I'm not sure, I'd have to see source code to properly understand what's happening here. But it seems that they aren't being registered as 'hit' at the same time. Could it be that?

Skilgannon15:39, 2 May 2013
 

That's what I assume.

Here's the current developmental code with all the debug code (I realize that it's quite a bit larger than 730 bytes.):

/*
EpeeistMicro v1.9.1 by Sheldor.  05/02/2013
A MicroBot with Stop and Go/Random movement and a guess factor gun.
Codesize: 730 Bytes without any colors.

Epee (pronounced ey-PEY) is one of the three forms of modern sport fencing,
along with Foil and Sabre.  http://en.wikipedia.org/wiki/Epee

Credits: 
Thanks go to the authors of the following bots:
	Targeting: Falcon, pez.micro.Aristocles, voidious.mini.Komarious, kc.micro.Thorn, jam.micro.RaikoMicro, jk.mini.CunobelinDC, mld.LittleBlackBook, jk.micro.Connavar.
	Movement : jk.micro.Toorkild, kc.micro.Thorn, wiki.nano.RaikoNano.
Special thanks to Jdev and Voidious for helping me with a math error.
And a general thanks to all open source bot authors and contributors to the RoboWiki.

EpeeistMicro is open source and released under the terms of the RoboWiki Public Code License (RWPCL) - Version 1.1.
See license here: http://robowiki.net/wiki/RWPCL
*/

package sheldor.micro;

import robocode.*;
import robocode.util.Utils;
import java.awt.geom.*;

public class EpeeistMicro extends AdvancedRobot
{
	//Constants.
	static final int    GUESS_FACTORS = 25;
	static final int    MIDDLE_FACTOR = (GUESS_FACTORS - 1) / 2;
	static final double MAXIMUM_ESCAPE_ANGLE = 0.72727272727272727272727272727273; //8 / 11
	static final double FACTOR_ANGLE = MAXIMUM_ESCAPE_ANGLE / MIDDLE_FACTOR;
	
	//Global variables.
	static double averageLateralVelocity;
	static double direction = 1;
	static double enemyBulletSpeed;
	static double enemyEnergy;
	static double enemyHeading;
	static double enemyVelocity;
	static double enemyX;
	static double enemyY;
	static double hits;
	static int    absoluteEnemyLateralVelocity;
	static int    movementMode;
	static int    timeSinceVelocityChange;
	
	static int ticks;
	
	//Array to store the number of times the enemy has visited each guess factor.
	//Segmented on acceleration, time since velocity change, absolute enemy lateral velocity, near wall, and distance.
	static int[][][][][][] guessFactors = new int[3][4][5][2][5][GUESS_FACTORS];
	
	//En garde!
	public void run()
	{
		//Set the radar and gun to turn independently.
		setAdjustRadarForGunTurn(true);
		setAdjustGunForRobotTurn(true);
	}
	
	public void onStatus(StatusEvent e)
	{
		//Turn the radar every tick.
		//Putting the code here instead of in the run() method saves one byte.
		//I believe Wompi discovered this.
    	setTurnRadarRightRadians(1);
	}
	
	public void onScannedRobot(ScannedRobotEvent e)
	{
		//Local variables.	
		//Declare most used integer before most used double to save several bytes.
		int    antiRam;
		double enemyDistance;
		double absoluteBearing;
		double enemyDirection;
		double lateralVelocity;
		double offset;
		double theta;
		int    acceleration;
		
		ticks = (int)getTime();
		
		//Fire a wave.
		Wave wave;
		addCustomEvent(wave = new Wave());
		
		enemyX = (wave.sourceX = getX()) + Math.sin(wave.absoluteBearing = absoluteBearing = 
			(e.getBearingRadians() + getHeadingRadians())) * (enemyDistance = e.getDistance());
		enemyY = (wave.sourceY = getY()) + Math.cos(absoluteBearing) * enemyDistance;
		
		/*********************************************
		 *---------------MOVEMENT CODE---------------*
		 *********************************************/
				
		//Retreat very heavily when the enemy is ramming.
		offset = 2 + (antiRam = (int)(100 / (wave.enemyDistance = enemyDistance = e.getDistance())));
		
		//Wall smoothing based on Toorkild's.
		//Subtract current coordinates from lower wall bounds instead of adding 
		//current coordinates to every fieldRectangle.contains() projection to save six bytes.  Thanks go to Skilgannon.
		Rectangle2D.Double fieldRectangle;
		while(!(fieldRectangle = new Rectangle2D.Double(18 - getX(), 18 - getY(), 764, 564)).
			contains(160 * Math.sin(theta = (wave.absoluteBearing = absoluteBearing = 
			(e.getBearingRadians() + getHeadingRadians())) + direction * (offset -= .02)), 160 * Math.cos(theta)));
		setTurnRightRadians(Math.tan(theta -= getHeadingRadians()));
			
		//Stop and Go movement based on Toorkild's.
		//Move when the enemy fires, or when the robot is moving randomly, or when the enemy is ramming.
		double energyDelta;
		if ((energyDelta = (enemyEnergy - (enemyEnergy = e.getEnergy()))) > movementMode - antiRam)
		{			
			//Calculate the length of Stop and Go movement based on enemy bullet power.
			setAhead(((3 + (int)(energyDelta / 0.5000001)) << 3) * Math.signum(Math.cos(theta)));
		}
		
		//Random movement from Toorkild.
		//Don't move randomly if the enemy is ramming, or if the bot is in Stop and Go mode.
		//Reverse direction if the bot gets too close to a wall.
		if (Math.random() + antiRam < (-0.6 * Math.sqrt(enemyBulletSpeed / enemyDistance) + 0.04) * movementMode || offset < Math.PI/3.5)
		{
			direction = -direction;
		}
		
		/********************************************
		 *--------------TARGETING CODE--------------*
		 ********************************************/
		
		//Determine the enemy's lateral velocity and movement direction.
		//Use a simple rolling average to store the previous lateral direction
		//if enemy lateral velocity == 0.  Inspired by LittleBlackBook.
		wave.enemyDirection = enemyDirection = (averageLateralVelocity = ((averageLateralVelocity * .01) +
			(lateralVelocity = ((enemyVelocity = e.getVelocity()) * Math.sin((enemyHeading = e.getHeadingRadians()) - absoluteBearing))))) < 0 ? -FACTOR_ANGLE : FACTOR_ANGLE;
		
		//Determine if the enemy is accelerating or decelerating.
		if ((acceleration = (int)Math.signum(absoluteEnemyLateralVelocity - (absoluteEnemyLateralVelocity = (int)Math.abs(lateralVelocity)))) != 0)
		{
			timeSinceVelocityChange = 0;
		}
					
		//Determine the current situation.
		//Declaring a local array saves two bytes.
		double angle;
		int[] guessFactorsLocal = wave.guessFactors = guessFactors
			[1 + acceleration] //Acceleration.
			[Math.min(3, (int)(Math.pow(280 * timeSinceVelocityChange++ / enemyDistance, .7)))] //Ticks since velocity change.
			[absoluteEnemyLateralVelocity / 2] //Absolute enemy lateral velocity.
			[(int)Math.signum(fieldRectangle.outcode(Math.sin(angle = (absoluteBearing +
				enemyDirection * MIDDLE_FACTOR)) * enemyDistance, Math.cos(angle) * enemyDistance))] //Near wall.  Many thanks go to Skilgannon for the outcode trick.
			[(int)enemyDistance / 200]; //Distance.

		//Find the most visited guess factor for the current situation.
		//Looping like this is ugly, but it saves two bytes over the proper way.
		int mostVisited = MIDDLE_FACTOR;
		int i = 0;
		try
		{
			while (true)
			{
				if (guessFactorsLocal[i] > guessFactorsLocal[mostVisited])
				{
					mostVisited = i;
				}
				i++;
			}			
		}
		catch(Exception ex)
		{
		}
		
		//Turn the gun to the most visited guess factor.
		//The slight offset helps to defeat simple bullet shielding.
		setTurnGunRightRadians(0.0005 + Utils.normalRelativeAngle(absoluteBearing - getGunHeadingRadians()
			+ (enemyDirection * (mostVisited - MIDDLE_FACTOR))));
		
		//Fire medium power bullets most of the time, but use full power at very close range.
		//If the enemy is weak, fire the minimum power needed to destroy them.
		setFire(Math.min(2 + antiRam, enemyEnergy / 4));
		
		//Narrow lock radar.
		setTurnRadarRightRadians(2 * Utils.normalRelativeAngle(absoluteBearing - getRadarHeadingRadians()));
	}
	
	public void onBulletHit(BulletHitEvent e)
	{
		//Adjust enemy energy variable when the bot hits the enemy.
		//This makes a big difference against linear targeting.
		enemyEnergy -= 10;
	}
	
	public void onHitByBullet(HitByBulletEvent e)
	{
		//Adjust enemy energy variable when the bot gets hit.
		//Store the velocity of the enemy bullet for the random movement.
		enemyEnergy += 20 - (enemyBulletSpeed = e.getVelocity());	
		
		//If the bot takes a lot of damage on average in Stop and Go mode, switch to Random Movement.
		//Thanks go to Skilgannon.
		if ((hits += (4.25 / enemyBulletSpeed)) > getRoundNum() + 2)
		{
			movementMode = -1;
		}
    }	
	
	static class Wave extends Condition
	{
		//Global variables.
		double absoluteBearing;
		double bearingOffset;
		double enemyDirection;
		double enemyDistance;
		double sourceX;
		double sourceY;	
		double waveDistanceTraveled;
		double distanceTraveled;
		int[]  guessFactors;
		
		public boolean test()
		{
			//Update the bearing offset with angular velocities.
			bearingOffset += (enemyVelocity * Math.sin(enemyHeading -= absoluteBearing)) / (enemyDistance += (enemyVelocity * Math.cos(enemyHeading/* - absoluteBearing*/)));
			
			//Check if the wave has passed the enemy's current location.
			if (Math.abs((waveDistanceTraveled += 14) - enemyDistance) <= 7)
			{
				//Calculate the guess factor that would have hit the enemy.
				//Increment the bin that represents that guess factor.
				guessFactors[(int)Math.round((bearingOffset / enemyDirection) + MIDDLE_FACTOR)]++;
				
				System.out.println("New Method - Tick: " + ticks + " - "  + bearingOffset);
			}
			
			if (Math.abs((distanceTraveled += 14) - Point2D.distance(sourceX, sourceY, enemyX, enemyY)) <= 7)
			{
				//Calculate the guess factor that would have hit the enemy.
				//Increment the bin that represents that guess factor.
				System.out.println("Old Method - Tick: " + ticks + " - "  + Utils.normalRelativeAngle(Math.atan2(enemyX - sourceX,
					enemyY - sourceY) - absoluteBearing));
			}
			return false;
		}
	}
}

Thanks

Sheldor16:22, 2 May 2013
 

Doing enemyHeading -= absoluteBearing in the test() method breaks things because many waves are evaluated each tick, but even after fixing that I'm seeing very different values for Point2D.distance(sourceX, sourceY, enemyX, enemyY) and enemyDistance, which is where I suspect the errors are creeping in. Of course, I can't see anything wrong with what you are doing :-/ Maybe a step-by-step printing/debugging with only one wave in the air would let you see how enemyDistance is deviating from the old value on a per-tick basis?

Skilgannon16:51, 2 May 2013
 

For some reason, enemyDistance is always 20-40 pixels less than the Point2D.distance() calculation.

Sheldor03:32, 3 May 2013