How to compare Angles relative to unit facing?

[Pinzu]

Unit A is facing X. Unit B casts a spell on unit A facing Y. How do I detect if the spell is coming from the side of unit A?

Extremly Enlarged Image

The purple sides are front/back of unit A. A direct hit is the light-purple horizontal line and the damage should get higher and higher the closer the angle correspond to that line and smaller and smaller the further away (after the orange parameter).

 

[Vinz]

Create in map header:

function GetRealOpposite takes real r returns real
    return -r
endfunction

function AlwaysPos takes real r returns real
    if r < 0. then
        set r = -r
    endif
    return r
endfunction

//locals
local real r1 = Angle X
local real r2 = Angle X + 90
local real r3 = Angle X - 90
local real r4 = Angle Y
local location p1 = Unit A Pos
local location p2 = Unit B Pos
local real r5 = Angle Between p1 and p2

if AlwaysPos(r2 - r5) < 45. then
    set r6 = AlwaysPos(r2 - r5)
    set r7 = r2
endif
if AlwaysPos(r3 - r5) < 45. then
    set r6 = AlwaysPos(r3 - r5)
    set r7 = r3
endif

set damage = damage * (1. + GetRealOpposite((r7 * 0.01)))

//remove leaks

At 45 degrees away from the horizontal purple line this will deal a bonus of 0% damage, increasing to 45% damage when closest to it.
Of course, either you do this calculation before dealing damage, or in a DDS if it's a buff checker/etc. spell.

 

[Pinzu]

local real r5 = Angle Between X and Y

X and Y - can only find "Angle between points" I'm sure that can't be right.

 

[Vinz]

yea it is AngleBetweenPoints, just a shortcut for creating points, then using that. xD

Sorry for not being clear.
Or if you use coordinates it's somewhere with Cosine.

 

[Pinzu]

function Trig_Ram_Conditions takes nothing returns boolean
    if ( not ( GetSpellAbilityId() == 'Aslo' ) ) then
        return false
    endif
    return true
endfunction

function Trig_Ram_Actions takes nothing returns nothing
    local unit x = GetSpellTargetUnit()
    local unit y = GetTriggerUnit()
    local real r1 = GetUnitFacing(x)
    local real r2 = r1 + 90
    local real r3 = r1 - 90
    local real r4 = GetUnitFacing(y)
    local location p1 = GetUnitLoc(x)
    local location p1 = GetUnitLoc(y)
    local real r5 = AngleBetweenPoints(p1, p2)
    local real r6
    local real r7
    local real damage

    if AlwaysPos(r2 - r5) < 45. then
        set r6 = AlwaysPos(r3 - r5)
        set r7 = r3
    endif


    if AlwaysPos(r3 - r5) < 45. then
        set r6 = AlwaysPos(r3 - r5)
        set r7 = r3
    endif

    set damage = damage * (1. + GetRealOpposite((r7 * 0.01)))
    call DisplayTextToForce( GetPlayersAll(), R2S(damage) )

endfunction

//===========================================================================
function InitTrig_Ram takes nothing returns nothing
    set local trigger t = CreateTrigger(  )
    call TriggerRegisterAnyUnitEventBJ( t, EVENT_PLAYER_UNIT_SPELL_EFFECT )
    call TriggerAddCondition( t, Condition( function Trig_Ram_Conditions ) )
    call TriggerAddAction( t, function Trig_Ram_Actions )
    set t = null
endfunction

I suck at this XD

 

[Vinz]

function Trig_Ram_Actions takes nothing returns boolean
    local unit x = GetSpellTargetUnit()
    local unit y = GetTriggerUnit()
    local real r1 = GetUnitFacing(x)
    local real r2 = r1 + 90
    local real r3 = r1 - 90
    local real r4 = GetUnitFacing(y)
    local location p1 = GetUnitLoc(x)
    local location p1 = GetUnitLoc(y)
    local real r5 = AngleBetweenPoints(p1, p2)
    local real r6
    local real r7
    local real damage
    local integer b = GetUnitAbilityLevel(GetTriggerUnit(), GetSpellAbilityId())
    if GetSpellAbilityId() == 'Aslo' then
        if AlwaysPos(r2 - r5) < 45. then
            set r6 = AlwaysPos(r3 - r5)
            set r7 = r3
        endif
        if AlwaysPos(r3 - r5) < 45. then
            set r6 = AlwaysPos(r3 - r5)
            set r7 = r3
        endif
        //set damage = some amount
        set damage = (40. * b)
        //this line below only increases damage
        set damage = damage * (1. + GetRealOpposite((r7 * 0.01)))
        call DisplayTextToForce( GetPlayersAll(), R2S(damage) )
        call RemoveLocation(p1)
        call RemoveLocation(p2)
    endif
    return false
endfunction

//===========================================================================
function InitTrig_Ram takes nothing returns nothing
    set local trigger t = CreateTrigger(  )
    call TriggerRegisterAnyUnitEventBJ( t, EVENT_PLAYER_UNIT_SPELL_EFFECT )
    call TriggerAddCondition( t, Condition( function Trig_Ram_Actions ) )
    set t = null
endfunction

Always use AddCondition over AddAction as it does not create a new thread. Remember to return false at the end of the func, and 'returns boolean'.

Also do not create a separate condition function since it can be done in If/Then/Else. Doing otherwise nullifies the first sentence^.

 

[Vinz]

Oh, shit, I only realized. Place the RemoveLocation outside the endif unlike I did.