Precise Point Targetting

[jhnam95]

What should be my base ability for abilities like arrow? I tried using channel and shockwave and those aren't really precise. If I order the unit to fire in a certain direction, it will shoot slightly off.

 

[SineCosine]

Welcome to the world of WC3 map-making.
It's never perfect.

And, please, don't ever use GetUnitFacing to tell where you should fire a projectile in a direction.
Use Atan2(ToY - FromY, ToX - FromX)

 

[jhnam95]

Yea, I kind of figured that out a while ago x(
I'm going to guess that means angle between unit and casting point?

 

[SineCosine]

I'm going to guess that means angle between unit and casting point?

Yes, but you should use X and Y co-ordinates.
If you really have to use points, remember to null them :thup:

 

[jhnam95]

How do I get the coordinates of the point he's shooting at other than using the point itself?

 

[SineCosine]

Shouldn't it be somewhere along the lines of arithmetic operations?
Try using real variables.

I only know the Jass equivalent =x

set Angle = Atan2(ToY - FromY, ToX - FromX) //In radians
set Angle = Atan2(ToY - FromY, ToX - FromX) * bj_RADTODEG //In degrees

 

[Jedi]

The problem is

You are telling spell target coordinates are wrong.But you find real coordinate with using spell target coordinates.

GUI Atan2

function Atan2BJ takes real y, real x returns real
    return Atan2(y, x) * bj_RADTODEG
endfunction

 

[SineCosine]

[lJASS]GetSpellTargetX()[/lJASS] and [lJASS]GetSpellTargetY()[/lJASS] are indeed slightly inaccurate, but it isn't by a hell lot..
(Well, to me it's a lot, but what does it matter?)

 

[jhnam95]

Sorry, I'm more of a GUI person ):
As for JASS, I can only do things like using locals :\

I don't know what Atan2 means...

 

[Jedi]

It means Atan2 in GUI
Math- Arctangent

 

[SineCosine]

Hallelujah!
It exists!

 

[jhnam95]

Um, it's actually shooting even more weird now O_O
It shoots from behind the unit and doesn't even go the proper direction.

 

[SineCosine]

You're using the wrong variables.

Atan2(Target'sY - Caster'sY, Target'sX - Caster'sX) //<--Use that.

Not:

Atan2(Caster'sY - Target'sY, Caster'sX - Target'sX) //<--Don't use that.

 

[jhnam95]

Lol, it works now.
It's SLIGHTLY off still, but for the most part it works pretty well. Thank you.

EDIT: Actually, slight is quite annoying D: The projectile path seems to be slightly toward the upward direction than where it should
EDIT2: Never mind. It was just the flying height of the projectile.