[JASS] Making an orbital in XE

[Titanhex]

I'm using XEColliders to create an orbital effect. Mostly it does straight lines but I figured I could manipulate it by setting loopControl to change the direction the unit rotates.

Well I haven't had much luck since my math is sub-par and setting the direction angle for a unit to move in a circle isn't easy nor are there tutorials I can adapt for it (Tried Daelin's static shapes tutorial)

Anyways, take a look, hopefully someone can help me make it so the xecollider rotates in a circle around the casting unit.

Orb

scope Orb initializer init

globals
    private constant integer SPELLID        = 'puor'
endglobals

private struct Data extends xecollider

    unit caster
    
    method loopControl takes nothing returns nothing
        local real dx = this.x - GetUnitX(this.caster)
        local real dy = this.y - GetUnitY(this.caster)
        local real dist = SquareRoot(dx * dx + dy * dy)
        local real angle = bj_RADTODEG * Atan2( this.y - GetUnitY(this.caster), this.x - GetUnitX(this.caster)) - 5.00
        local real x = this.x + dist * Cos(angle * bj_DEGTORAD)
        local real y = this.y + dist * Sin(angle * bj_DEGTORAD)
        set this.direction = bj_RADTODEG * Atan2( this.y - y, this.x - x )
    endmethod
    
    method onUnitHit takes unit target returns nothing
        if IsUnitEnemy(target, GetOwningPlayer(this.caster)) then
            call this.terminate()
        endif
    endmethod

    static method Actions takes unit c returns nothing
        local real angle = bj_RADTODEG * Atan2(GetUnitFacing(c) - GetUnitY(c), GetUnitFacing(c) - GetUnitX(c))
        local Data xc = Data.create( GetUnitX(c)+200, GetUnitY(c)+200, 0 )
        set xc.caster           = c
        set xc.fxpath           = GetAbilityEffectById(SPELLID, EFFECT_TYPE_MISSILE, 0)
        set xc.speed            = 375
    endmethod

    static method Conditions takes nothing returns boolean
        if GetSpellAbilityId() == SPELLID then
            call Data.Actions(GetTriggerUnit())
        endif
     return false
    endmethod
    
endstruct

//===========================================================================
public function init takes nothing returns nothing
local trigger t = CreateTrigger(  )
    call TriggerRegisterAnyUnitEventBJ( t, EVENT_PLAYER_UNIT_SPELL_EFFECT )
    call TriggerAddCondition( t, function Data.Conditions )
endfunction

endscope

 

[watermelon_1234]

First off, you're converting needlessly to radians and degrees. As far as I can remember, xecollider, along with xefx, does everything in radians.

Second, I would just rotate xecollider manually through loopControl because trying to do so with its default movement would just give you a headache.

In loopControl:

set .ang = .ang + r // r = number of radians that should be rotated every XE_ANIMATION_PERIOD. .ang is a struct member that's a real.
set .x = GetUnitX(.caster) + OFFSET*Cos(.ang) // OFFSET would be how far the xecollider should be from the caster. In your case, 200
set .y = GetUnitY(.caster) + OFFSET*Sin(.ang)

By the way, the way you created your xecollider should look something like this:

local Data xc = Data.create( GetUnitX(c)+200*Cos(.ang), GetUnitY(c)+200*Sin(.ang), 0 )

This way, your xecollider would be created in regards to direction. .ang should be in radians and is used in loopControl.