Talk:Linear Targeting/Buggy Implementations - Revision history

Voidious: add Buggy Implementation #5 discussion

2011-04-17T03:48:00Z

add Buggy Implementation #5 discussion

RednaxelaBot: Using .

2010-07-01T08:34:44Z

Using <syntaxhighlight>.

Chase-san: /* Off the top of my head.. but could this work */

2009-05-13T21:07:41Z

Off the top of my head.. but could this work

Chase-san: /* Off the top of my head.. but could this work */

2009-05-13T20:57:18Z

Off the top of my head.. but could this work

Chase-san: /* Off the top of my head.. but could this work */ - Forgot my signature

2009-05-13T20:55:19Z

Off the top of my head.. but could this work: - Forgot my signature

Chase-san: New section: Off the top of my head.. but could this work

2009-05-13T20:53:29Z

New section: Off the top of my head.. but could this work

CrazyBassoonist at 22:43, 9 April 2009

2009-04-09T22:43:40Z

Voidious: snippets need some reformatting

2007-11-14T19:43:14Z

snippets need some reformatting

New page

These code snippets should be modified to not have super long lines. Also, there's no reason for the last one to be indented across the whole snippet. --[[User:Voidious|Voidious]] 19:43, 14 November 2007 (UTC)

← Older revision		Revision as of 03:48, 17 April 2011
Line 61:		Line 61:

	: Actually now that I actually look at the other code this is like buggy implimentation #3 and the nano targeting (simple trig). --[[User:Chase-san\|Chase]] 21:07, 13 May 2009 (UTC)		: Actually now that I actually look at the other code this is like buggy implimentation #3 and the nano targeting (simple trig). --[[User:Chase-san\|Chase]] 21:07, 13 May 2009 (UTC)
		+
		+	== Buggy implementation #5 ? ==
		+
		+	Hey, I've been suffering with trig, and I need help. I've been trying to create a linear targeting [[Virtual Gun]] for [[BulletSimBot]], because the one it has at the moment is slightly inaccurate, and now it's many, many times more inaccurate... I need help! What's wrong with this? It ends up shooting opposite of where I want it to!
		+	<syntaxhighlight>
		+	//This calculates the angle the scanned robot would shoot at if he were using linear targeting, but fails miserably.
		+	public double linear(ScannedRobotEvent e, double power) {
		+	double absoluteBearing = getHeadingRadians() + e.getBearingRadians();
		+	double angleToFire = Utils.normalRelativeAngle(absoluteBearing + (e.getVelocity() * Math.asin(Math.sin(e.getHeadingRadians() -
		+	absoluteBearing) / (20 - power * 3))));
		+	return angleToFire;
		+	}
		+	</syntaxhighlight>
		+
		+	Any help? PS: Am I supposed to move all of the numbers or something so that I'm number one and so on? --[[User:Awesomeness\|Awesomeness]] 03:11, 23 January 2010 (UTC)
		+
		+	: No, you should actually move this to the bottom and label it number five. But I think think this belong to this page at all. --[[User:Nat\|<span style="color:#099;">Nat</span>]] [[User talk:Nat\|<span style="color:#0a5;">Pavasant</span>]] 12:02, 23 January 2010 (UTC)
		+
		+	Well, that "Utils.normalRelativeAngle" should be "Utils.normalAbsoluteAngle" since angleToFire is an absolute angle, unlike gunturn. Other than that it looks right to me. If that doesn't fix it, I'd suspect whatever code is making use of the 'angleToFire'. --[[User:Rednaxela\|Rednaxela]] 03:29, 23 January 2010 (UTC)
		+
		+	::Changing it didn't seem to change the result at all. Can you test it? It's not working... And I tested the bullet simulator, it works fine. --[[User:Awesomeness\|Awesomeness]] 04:03, 23 January 2010 (UTC)
		+
		+	I think you want to calculate the angle enemy will shoot at you, not the angle you are shooting at enemy. So...
		+	<syntaxhighlight>
		+	//This calculates the angle the scanned robot would shoot at if he were using linear targeting, but fails miserably.
		+	public double linear(ScannedRobotEvent e, double power) {
		+	double absoluteBearing = Utils.normalAbsoluteAngle(getHeadingRadians() + e.getBearingRadians() + Math.PI);
		+	double angleToFire = Utils.normalAbsoluteAngle(absoluteBearing + (getVelocity() * Math.asin(Math.sin(e.getBearingRadians()) / (20 - power * 3))));
		+	return angleToFire;
		+	}
		+	</syntaxhighlight>
		+
		+	Well, in case you confused; since the targeting formula:
		+
		+	:<math>
		+	velocity \times \sin (targetHeading - targetAngle) \over {bulletVelocity}
		+	</math>
		+
		+	:(TeX seems to be error, here is plain text version: ''velocity × ''sin''(targetHeading - targetAngle) / bulletVelocity'')
		+
		+	And thus the angle from enemy to you is your angle to enemy plus PI rad (= 180 degrees), yield <code>targetAngle = getHeadingRadians() + e.getBearingRadians() + Math.PI</code>
		+
		+	<code>targetHeading</code> is your own heading, since you are targeting your own robot. Put those things into the formula above will result in this ''sin'' expressions:
		+
		+	<code>sin(getHeadingRadians() - getHeadingRadians() - e.getBearingRadians() - Math.PI) == sin(-e.getBearingRadians() - Math.PI) == Math.sin(e.getBearingRadians())</code>.
		+
		+	Thus the final code being as my code above. --[[User:Nat\|<span style="color:#099;">Nat</span>]] [[User talk:Nat\|<span style="color:#0a5;">Pavasant</span>]] 12:00, 23 January 2010 (UTC)
		+
		+	:Oh, lol.. I feel so stupid XD --[[User:Awesomeness\|Awesomeness]] 13:10, 23 January 2010 (UTC)

@@ Line 1: / Line 1: @@
 These code snippets should be modified to not have super long lines. Also, there's no reason for the last one to be indented across the whole snippet.  --[[User:Voidious|Voidious]] 19:43, 14 November 2007 (UTC)
-<pre>
+<syntaxhighlight>
 		double absBearing=e.getBearingRadians()+getHeadingRadians();
@@ Line 21: / Line 21: @@
 		setFire(3);
-</pre>
+</syntaxhighlight>
@@ Line 30: / Line 30: @@
 Not sure if this could actually work, untested, and here it is in uncompiled code. I got this from my 3D version of my linear targeting, translated into java (I am sure I screwed up somewhere :P). Given locations of the two robots x and y, and your bullet and enemies velocities along the two axis, should get the final position of intersection in x and y coordinates. --[[User:Chase-san|Chase]] 20:55, 13 May 2009 (UTC)
-<pre>
+<syntaxhighlight>
 class vect {
 	double x;
@@ Line 58: / Line 58: @@
+	}
+}
-</pre>
+</syntaxhighlight>
 : Actually now that I actually look at the other code this is like buggy implimentation #3 and the nano targeting (simple trig). --[[User:Chase-san|Chase]] 21:07, 13 May 2009 (UTC)

← Older revision		Revision as of 21:07, 13 May 2009
Line 59:		Line 59:
	}		}
	</pre>		</pre>
		+
		+	: Actually now that I actually look at the other code this is like buggy implimentation #3 and the nano targeting (simple trig). --[[User:Chase-san\|Chase]] 21:07, 13 May 2009 (UTC)

@@ Line 54: / Line 54: @@
 		double a = bVel*bVel - tVel.dot(tVel);
 		double b = rPos.dot(eVel);
-		double c = (b + Math.sqrt(rPos.dot(rPos).mul(a)+b*b))/a;
+		double c = (b + Math.sqrt(rPos.dot(rPos)*a+b*b))/a;
 		return tPos.add(tVel.mul(c));
+	}
+}
 </pre>

@@ Line 28: / Line 28: @@
 == Off the top of my head.. but could this work ==
-Not sure if this could actually work, untested, and here it is in uncompiled code. I got this from my 3D version of my linear targeting, translated into java (I am sure I screwed up somewhere :P). Given locations of the two robots x and y, and your bullet and enemies velocities along the two axis, should get the final position of intersection in x and y coordinates.
+Not sure if this could actually work, untested, and here it is in uncompiled code. I got this from my 3D version of my linear targeting, translated into java (I am sure I screwed up somewhere :P). Given locations of the two robots x and y, and your bullet and enemies velocities along the two axis, should get the final position of intersection in x and y coordinates. --[[User:Chase-san|Chase]] 20:55, 13 May 2009 (UTC)
 <pre>

← Older revision		Revision as of 20:53, 13 May 2009
Line 25:		Line 25:

	I'm trying to make a gun that makes use of code similar to this, but for some reason this doesn't work exactly right... Does anyone know if this is a math problem or a programming problem?--[[User:CrazyBassoonist\|CrazyBassoonist]] 22:43, 9 April 2009 (UTC)		I'm trying to make a gun that makes use of code similar to this, but for some reason this doesn't work exactly right... Does anyone know if this is a math problem or a programming problem?--[[User:CrazyBassoonist\|CrazyBassoonist]] 22:43, 9 April 2009 (UTC)
		+
		+	== Off the top of my head.. but could this work ==
		+
		+	Not sure if this could actually work, untested, and here it is in uncompiled code. I got this from my 3D version of my linear targeting, translated into java (I am sure I screwed up somewhere :P). Given locations of the two robots x and y, and your bullet and enemies velocities along the two axis, should get the final position of intersection in x and y coordinates.
		+
		+	<pre>
		+	class vect {
		+	double x;
		+	double y;
		+	public vect(double nx, double ny) {
		+	x = nx;
		+	y = ny;
		+	}
		+	public double dot(vect i) {
		+	return i.xx+i.yy;
		+	}
		+	public vect sub(vect i) {
		+	return new vect(x-i.x,y-i.y);
		+	}
		+	public vect add(vect i) {
		+	return new vect(x+i.x,y+i.y);
		+	}
		+	public vect mul(double i) {
		+	return new vect(xi,yi);
		+	}
		+	public vect intercept(vect cPos, vect ePos, vector eVel, double bVel) {
		+	vect rPos = ePos.sub(cPos);
		+	double a = bVel*bVel - tVel.dot(tVel);
		+	double b = rPos.dot(eVel);
		+	double c = (b + Math.sqrt(rPos.dot(rPos).mul(a)+b*b))/a;
		+	return tPos.add(tVel.mul(c));
		+	}
		+	}
		+	</pre>

← Older revision		Revision as of 22:43, 9 April 2009
Line 1:		Line 1:
	These code snippets should be modified to not have super long lines. Also, there's no reason for the last one to be indented across the whole snippet. --[[User:Voidious\|Voidious]] 19:43, 14 November 2007 (UTC)		These code snippets should be modified to not have super long lines. Also, there's no reason for the last one to be indented across the whole snippet. --[[User:Voidious\|Voidious]] 19:43, 14 November 2007 (UTC)
		+
		+	<pre>
		+	double absBearing=e.getBearingRadians()+getHeadingRadians();
		+
		+	double eX=getX() + e.getDistance() * Math.sin(absBearing);
		+
		+	double eY=getY() + e.getDistance() * Math.cos(absBearing);
		+
		+	eXChange=(eX-oldX)*(e.getDistance()/11);
		+
		+	eYChange=(eY-oldY)*(e.getDistance()/11);
		+
		+	oldX=getX() + e.getDistance() * Math.sin(absBearing);
		+
		+	oldY=getY() + e.getDistance() * Math.cos(absBearing);
		+
		+	double enemyLocation=robocode.util.Utils.normalAbsoluteAngle(Math.atan2((eX-getX())+eXChange,(eY-getY())+eYChange));
		+
		+	setTurnGunRightRadians(robocode.util.Utils.normalRelativeAngle(enemyLocation-getGunHeadingRadians()));
		+
		+	setFire(3);
		+	</pre>
		+
		+
		+	I'm trying to make a gun that makes use of code similar to this, but for some reason this doesn't work exactly right... Does anyone know if this is a math problem or a programming problem?--[[User:CrazyBassoonist\|CrazyBassoonist]] 22:43, 9 April 2009 (UTC)