Snippet Position of a Unit towards another Unit

[Tom_Kazansky]

I don't know how should I name this snippet, so if anyone can rename it, please tell me.
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ok, now, about my snippet.
There is two units, unit U and unit S, this snippet allows you to check if U is in front of S or U is behind S or U is at left side of S or U is at right side of S.

Here is my code:

function UnitPosChecker takes unit check, unit source returns integer
    local real face = GetUnitFacing(source)
    local real angle = bj_RADTODEG * Atan2(GetUnitY(check) - GetUnitY(source), GetUnitX(check) - GetUnitX(source))
    //I think it is easier if we check when source face 0 degree,
    // so the angle between source and check should be decreased by facing angle of source

    if angle < 0 then //only check with positive angle
        set angle = angle + 360.  - face
    else
        set angle = angle - face
    endif

    if angle < 0 then //only check with positive angle
        set angle = angle + 360.
    endif
        
    if ( angle <= 30. and angle >= 0. ) or  ( angle <= 360. and angle >= 330. ) then
        return 1 //check is in front of source
    endif
    if angle > 30. and angle < 135. then
        return 2 //check is at left side of source
    endif
    if angle > 225. and angle < 330. then
        return 3 //check is at right side of source
    endif
    //angle >= 135 and angle <= 225
    return 4 //check is behind source
endfunction
    
function IsUnitInfront takes unit check, unit source returns boolean
    return (UnitPosChecker( check , source ) == 1)
endfunction
    
function IsUnitAtLeftSide takes unit check, unit source returns boolean
    return (UnitPosChecker( check , source ) == 2)
endfunction
    
function IsUnitAtRightSide takes unit check, unit source returns boolean
    return (UnitPosChecker( check , source ) == 3)
endfunction
    
function IsUnitBehind takes unit check, unit source returns boolean
    return (UnitPosChecker( check , source ) == 4)
endfunction

Implement
- For GUI users:
+ Copy and Paste these functions to the map header. (In the Trigger Editor (F4), left click on your map's name)
+ Create a boolean variable, ex: TempCheck, and use custom script actions:

Custom Script: set udg_TempCheck = IsUnitInfront( udg_<unit U variable name>, udg_<unit S variable name> )
//or
Custom Script: set udg_TempCheck = IsUnitBehind( udg_<unit U variable name>, udg_<unit S variable name> )
//or
Custom Script: set udg_TempCheck = IsUnitAtLeftSide( udg_<unit U variable name>, udg_<unit S variable name> )
//or
Custom Script: set udg_TempCheck = IsUnitAtRightSide( udg_<unit U variable name>, udg_<unit S variable name> )

and then check the udg_TempCheck variable

- For Jass users:
+ Copy and Paste these functions to the map header, or to your library (if you use NewGen)
+ You can directly call function UnitPosChecker (it returns integer) or you can call function IsUnitInfront, IsUnitBehind, IsUnitAtLeftSide, IsUnitAtRightSide.

Demo
I have made a spell called Kris Slice:

A strike that deals 100 + 1.5 times Agility of the Hero to a single target. 
If this unit is struck from sides, it will suffer more damage.
If this unit is struck from behide, it will suffer more damage and be knocked back.

[Level 1] Extra damage: 100
[Level 2] Extra damage: 125
[Level 3] Extra damage: 150
[Level 4] Extra damage: 175

Kris Slice
    Events
        Unit - A unit Starts the effect of an ability
    Conditions
        (Ability being cast) Equal to Kris Slice 
    Actions
        Set TempUnit = (Triggering unit)
        Set TempInt = (Level of Kris Slice  for TempUnit)
        Set TempUnit2 = (Target unit of ability being cast)
        Set TempReal = (100.00 + (1.50 x (Real((Agility of TempUnit (Include bonuses))))))
        [B]Custom script:   set udg_TempCheck = IsUnitBehind( udg_TempUnit , udg_TempUnit2 )[/B]
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
            If - Conditions
                TempCheck Equal to True
            Then - Actions
                -------- plus the damage --------
                Set TempReal = (TempReal + (75.00 + (25.00 x (Real(TempInt)))))
                -------- slide (knockback) --------
                Set TempLoc = (Position of TempUnit)
                Set TempLoc2 = (Position of TempUnit2)
                Set SlideIndex = (SlideIndex + 1)
                Set SlideUnit[SlideIndex] = TempUnit2
                Set SlideAngle[SlideIndex] = (Angle from TempLoc to TempLoc2)
                Set SlideTick[SlideIndex] = 20
                Set SlideDistance[SlideIndex] = 10.00
                Custom script:   call RemoveLocation( udg_TempLoc )
                Custom script:   call RemoveLocation( udg_TempLoc2 )

            Else - Actions
                [B]Custom script:   set udg_TempCheck = ( IsUnitAtLeftSide( udg_TempUnit , udg_TempUnit2 ) or IsUnitAtRightSide( udg_TempUnit , udg_TempUnit2 ) )[/B]
                If (All Conditions are True) then do (Then Actions) else do (Else Actions)
                    If - Conditions
                        TempCheck Equal to True
                    Then - Actions
                        -------- plus the damage --------
                        Set TempReal = (TempReal + (75.00 + (75.00 x (Real(TempInt))))) 
                    Else - Actions
        -------- Visual and Deals damage --------
        Floating Text - Create floating text that reads ((String((Integer(TempReal)))) + !) above TempUnit with Z offset 0.00, using font size 10.00, color (100.00%, 0.00%, 0.00%), and 0.00% transparency
        Floating Text - Set the velocity of (Last created floating text) to 64.00 towards 90.00 degrees
        Floating Text - Change (Last created floating text): Disable permanence
        Floating Text - Change the lifespan of (Last created floating text) to 3.00 seconds
        Floating Text - Change the fading age of (Last created floating text) to 1.00 seconds
        Unit - Cause TempUnit to damage TempUnit2, dealing TempReal damage of attack type Chaos and damage type Normal

I have attached the demo map below.
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Please comment :thup:

 

[cr4xzZz]

> If this unit is struck from sides, it will suffer more damage.

If you cast an ability how could possibly the unit be at your sides? The unit is facing it's target instantly, right? ^^

 

[Tom_Kazansky]

> If this unit is struck from sides, it will suffer more damage.

If you cast an ability how could possibly the unit be at your sides? The unit is facing it's target instantly, right? ^^

Oh my.. English . I mean when the caster is at sides of the target, the target will suffer more damage.

 

[cr4xzZz]

Oh, sorry, it's my mistake... I was thinking about the caster's facing, my bad.

 

[T.s.e]

Awesome, now my spell idea can be completed