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Wicked Studios



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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.

 
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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.

 
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Radix

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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

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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".

 
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Werbad



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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
24th August, 2006 at 11:37:17 -

Sqr and pow? O.o Whats that?

 

Alice Pierce



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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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24th August, 2006 at 12:18:25 -

Yeah, thanks alot.
Now it all makes sense.

 

DaVince

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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.

 
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Joe.H

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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

 
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Werbad



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25th August, 2006 at 02:21:39 -

I think aTan is used when calculating angles

 
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25th August, 2006 at 02:47:49 -

^ I think so too, unless I just code wrong.

 
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Joe.H

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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

 
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Flava



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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)

 
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Radix

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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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Werbad



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25th August, 2006 at 12:08:49 -

You couldn't get distance in KnP since it didn't have an advanced expression editor nor extension support... The closest would be to get the difference in X or Y position...
But it was like 5 years since i last used KnP so i don't remember that well

 
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Flava



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25th August, 2006 at 12:50:16 -

He's using MMF2, not KNP.
Or are you replying to somebody else?

 
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Sephirenn

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25th August, 2006 at 16:02:34 -

ORRRR, you could judt make a circle radius 50, have it invisible, and its always attached to center of the bullet, then when it touches or overlaps the character, have it chase him

 
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Wicked Studios



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25th August, 2006 at 17:05:45 -

angle calculator hasnt been ported to mmf2 yet (at least i think) and the distance formula I tried did look like something Radix did although i probably ended up typing something in wrong cuz it didnt work. i'll try again and let you all know, and thanks for all the help

 
"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."

Wicked Studios



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25th August, 2006 at 17:07:33 -

thanks for the heads up on that extension flava, it seems when i read this the first time i must've skipped right past your post lol.

 
"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."

Radix

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26th August, 2006 at 02:36:54 -

You couldn't get distance in KnP since it didn't have an advanced expression editor nor extension support... The closest would be to get the difference in X or Y position...

Fail.
Image

The only limitation is that you have to use alt values instead of brackets and you're finding the square of the distance, not the distance itself.

 
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Werbad



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26th August, 2006 at 04:30:09 -

Never thought about that! It's not the same way as in MMF but it works! nice!

 
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