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Posted By
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Wicked Studios
Registered
25/10/2004
Points
460
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22nd August, 2006 at 17:28:31 -
I'm making some bullets that home in on enemies for a game, and i wanted it so when they are about 50 pixels away from and enemy, they will chase it. Problem is, theres no angle calculator for MMF2 and i can't quite get the distance formula to work for me (maybe a little help with that?) so if anyone can help or has any ideas, I'd really appreciate it.
"Actually sir, we found a tiny unicorn in your exhaust. It was jumping around poking holes in your gas tank." "Oh thank you I did not know that. A tiny unicorn? Wow."
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DaVince
This fool just HAD to have a custom rating
Registered
04/09/2004
Points
7998
    
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22nd August, 2006 at 17:32:50 -
No angle calculator? Browse through the forums better. 
http://www.create-games.com/forum_post.asp?id=166186
OKAY NOW THIS IS A USE TO SOMEONE APPARENTLY 
You could also do: when the x of the bullet > the x of the enemy - 50 AND when the bullet x < enemy x + 50 AND these two for the Y, toggle a flag that makes the bullet chase the enemy.
Old member (~2004-2007).
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Radix
hot for teacher
Registered
01/10/2003
Points
3139
   
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22nd August, 2006 at 22:44:05 -
I'm not sure what the hell you just said so I'll just give him the answer.
Distance formula is: sqrt((y1-y2)^2+(x1-x2)^2)
Which in klik looks a little something like this: Sqr( ( ( X( "Object 1" ) - X( "Object 2" ) ) * ( X( "Object 1" ) - X( "Object 2" ) ) ) + ( ( Y( "Object 1" ) - Y( "Object 2" ) ) * ( Y( "Object 1" ) - Y( "Object 2" ) ) ) )
I'm sure there are extensions to make it easier but that's pretty much what I do.
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Fifth
Quadruped
Registered
07/05/2003
Points
5818
  
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23rd August, 2006 at 01:34:27 -
You can also make your expressions a little tidier by using "pow" to raise the distances to the second power.
You just have to remember that its syntax isn't like "pow(x,y)", but rather "x pow y".
Go Moon!
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Werbad
Registered
18/09/2002
Points
235
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24th August, 2006 at 10:41:34 -
Sqr( ( X( "Object 1" ) - X( "Object 2" ) ) pow 2 + ( Y( "Object 1" ) - Y( "Object 2" ) ) pow 2 )
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Deleted User
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24th August, 2006 at 11:37:17 -
Sqr and pow? O.o Whats that?
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Alice Pierce
Registered
08/01/2006
Points
6
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24th August, 2006 at 12:16:20 -
X Power Y = X*X*...*X }Y times
e.g. 3 pow 4 = 3*3*3*3, 7 pow 2 = 7*7
Squarte of X = Y only if Y*Y = X
e.g. Sqrt 4 = 2 cause 2*2=4, Sqrt 25 = 5 cause 5*5 = 25
Now you understand it?
;]
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Deleted User
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24th August, 2006 at 12:18:25 -
Yeah, thanks alot.
Now it all makes sense.
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DaVince
This fool just HAD to have a custom rating
Registered
04/09/2004
Points
7998
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24th August, 2006 at 15:45:45 -
Squarte? Square root.
Pow is power. Like 2^5 (or 2 pow 5) is 2*2*2*2*2.
Old member (~2004-2007).
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Joe.H
Evil Faker
Registered
19/08/2002
Points
3305
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24th August, 2006 at 20:30:25 -
you could also do 2^(1/5), to get the 5th root, could you not?
I've never tried this... Someone try it and tell me
(Also might consider trying a^(x/y) i.e 2^(3/2) to give the square root of 2 cubed... I've never tried it in mmf, if it works it could be useful for saving on coding if it were ever used... not useful in this situation though, as it has to be the square root((X difference)² + (Y difference)²))
You could also get the angle using tan (y difference/x difference) but i think MMF has tan angles in radians... easy to convert to degrees though, (1 radian = 180/pi degrees)
uh... yeah
My signature is never too big!!!
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Werbad
Registered
18/09/2002
Points
235
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25th August, 2006 at 02:21:39 -
I think aTan is used when calculating angles
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Peblo
Custom ratings must be 50 characters or less
Registered
05/07/2002
Points
185
      
      
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25th August, 2006 at 02:47:49 -
^ I think so too, unless I just code wrong.
"Isn't it always amazing how we characterize a person's intelligence by how closely their thinking matches ours?"
~Belgarath
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Joe.H
Evil Faker
Registered
19/08/2002
Points
3305
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25th August, 2006 at 07:28:28 -
uh... no, you're right, i just wrote that at about 1am, when i was very tired 
My signature is never too big!!!
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Flava
Registered
30/07/2002
Points
684
 
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25th August, 2006 at 07:37:05 -
Try using the advanced direction object?
It was converted to MMF2 and can find the distance between two points (if that is what you want - I haven't read the post fully to be honest)
This is a signature. Have this one on me.
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Radix
hot for teacher
Registered
01/10/2003
Points
3139
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25th August, 2006 at 10:57:09 -
Distance formula isn't too hard. Generally you're better doing it manually as to dodge the extension overhead. I've been doing it that way since KNP.
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