[Spell] How do "Magic circle"

[mateuspv]

Well I'd like help making a magic pulled units in a certain region, the area of effect spell is like a circle.
The problem is I want an effect where the units are pulled slowly to the caster
The effect is going to a certain region and returns to the User who launched,
so when the effect is to pull back the units, someone knows how to do?
I leave here the model I have, I do not remember where ...

GUI no matter what method, Jass, just give me a direction

 

[Zaio]

Give a few more details please.

Do you want this circle to follow the caster if he moves? If not will the caster be able to move? Do you want it to pause the units being pulled back or make it able for them to attempt to run?

 

[mateuspv]

when the circle back, pull the units for whom the spell started
can move or not, is optional

edit:

anyone?

 

[CoLd Bon3]

Sooo you want a spell like this - the caster creates an circle at a point and all units inside the circle to be pulled towards the caster? Is that what you want?

 

[Zaio]

Im not really sure what it is you're after... Is it like my Divine Halo (in my signature) but it pulls units towards the caster on contraction?

 

[mateuspv]

Yes Is it like you Divine Halo.

just need to go and pulling unit.

 

[Zaio]

On contraction, you can just decrease a real so it will be the same radius as the dummies, EnumUnitsInRange it, check if they are allies/buildings/invulnerable/and if you want, magic immune, if all checks out then move that unit towards the caster by an amount you set.

To move units towards the caster, get the casters x and y with

set x = GetUnitX(whichunit) 
set y = GetUnitY(whichunit)

then do this

set x2 = x + <distance> * Cos((<angle>) * bj_DEGTORAD)
set y2 = y + <distance> * Sin((<angle>) * bj_DEGTORAD)

You can get the angle with

function AngleBetweenPoints takes location locA, location locB returns real
    return bj_RADTODEG * Atan2(GetLocationY(locB) - GetLocationY(locA), GetLocationX(locB) - GetLocationX(locA))
endfunction

Which would be

bj_RADTODEG * Atan2(<secondY> - <firstY>, <secondX> - <firstX>)

Then

SetUnitX(whichunit, x2)
SetUnitY(whichunit, y2)