Q: A unique application of "atan2"

[martix]

Is there some unique thing that you can do with this func, that you can't do with some other one.
Up till now I haven't been able to think of anything that can't also be done with angle between points?
And something useful too, something that can get in your map.

 

[Kerberos]

You can use Atan2 to make AngleBetweenPoints work. If you look at blizzard.j, you'll see that AngleBetweenPoints uses the function Atan2. I think that Atan2 was a Reign of Chaos thing, and AngleBetweenPoints was put in in The Frozen Throne.

 

[Chocobo]

You can use Atan2 to make AngleBetweenPoints work. If you look at blizzard.j, you'll see that AngleBetweenPoints uses the function Atan2. I think that Atan2 was a Reign of Chaos thing, and AngleBetweenPoints was put in in The Frozen Throne.

The list of Atan2 usage :

MeleeGetProjectedLoc
AngleBetweenPoints
Atan2BJ


But well, AngleBetweenPoints can be modified to :

function ChocoboAngleBetweenPoints takes real x1,real x2, real y1, real y2 returns real
    return 180.0/3.14159*Atan2(y2-y1,x2-x1)
endfunction

MeleeGetProjectedLoc (AFAIK, it returns a location which has a <distance> from <a source> in the direction of <the target> :

function ChocoboMeleeGetProjectedLoc takes real x1, real y1, real x2, real y2, real dist, real Angle returns location
    return Location(x1+dist*Cos(Atan2(y2-y1,x2-x1)+Angle),y1+dist*Sin(Atan2(y2-y1,x2-x1)+Angle))
endfunction

(real x1, real y1 for the source, real x2, real y2 for the target)

 

[martix]

I mean - I wonder why its put there at all... if you can do that with angle between points.
Say you know only GUI, you like working with points and stuff - why would you use that function. I believe it was called "Math - Arctangent from deltas" in GUI.