How to detect backstab?

Aeroblyctos · Mar 26, 2011

Hey.

How do I do this?

If the enemy unit is attacked from behind the sword deals extra damage (AGIx2).

It suppose to be passive.

Adiktuz · Mar 26, 2011

search the T&S section, there are a lot of formulas on several threads for this...

Pharaoh_ · Mar 26, 2011

You can check this out:
http://www.wc3c.net/showthread.php?t=92733

Kitabatake · Mar 26, 2011

Backstab
- Events
  - Unit - A unit Is attacked
- Conditions
- Actions
  - Set Point = (Position of (Attacking unit))
  - Set angle[1] = (Facing of (Attacked unit))
  - Set Point2 = (Position of (Attacked unit))
  - Set angle[2] = (Angle from Point to Point2)
  - Set angle[2] = ((angle[2] - angle[1]) + 180.00)
  - If (angle[2] Greater than or equal to 360.00) then do (Set angle[2] = (angle[2] - 360.00)) else do (Do nothing)
  - If (angle[2] Less than 0.00) then do (Set angle[2] = (angle[2] + 360.00)) else do (Do nothing)
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - angle[2] Greater than or equal to 90.00
      - angle[2] Less than or equal to 270.00
    - Then - Actions
      - -------- Target is facing away from attacker --------
      - Unit - Cause (Attacking unit) to damage (Attacked unit), dealing (Damage taken) damage of attack type Normal and damage type Normal
      - Special Effect - Create a special effect attached to the chest of (Attacked unit) using Objects\Spawnmodels\Human\HumanLargeDeathExplode\HumanLargeDeathExplode.mdl
      - Special Effect - Destroy (Last created special effect)
    - Else - Actions
      - -------- Target is not facing away from attacker --------
  - Custom script: call RemoveLocation(udg_Point)
  - Custom script: call RemoveLocation(udg_Point2)

Adiktuz · Mar 26, 2011

why not just combine the two angle[2] sets?

Kitabatake · Mar 26, 2011

Adiktuz said:
why not just combine the two angle[2] sets?

Edited.

Aeroblyctos · Mar 26, 2011

Hmm. Hmm. Kita's trigger looks something I've been trying to do.

Excellent. Can you please give me the trigger via a map so I can test if it works and then add it to a project I'm making?

Kitabatake · Mar 26, 2011

Aeroblyctos said:
Hmm. Hmm. Kita's trigger looks something I've been trying to do.

Excellent. Can you please give me the trigger via a map so I can test if it works and then add it to a project I'm making?

You lazy bastard.

Aeroblyctos · Mar 26, 2011

Yes, YESH! It's working, and it's simple enough for my brains to understand what's going on. Superb thanks to everyone who helped in a way or another.

Oh laziness, oh laziness. Aah.

Garfield1337 · Mar 26, 2011

I know this is solved,but there's an easier/shorter solution:
http://www.hiveworkshop.com/forums/...fference-between-angles-easy-solution-181644/

You just need this

JASS:

function GetAngleDifference takes real ang1, real ang2 returns real
    return Acos(Cos((bj_DEGTORAD * ang1)-(bj_DEGTORAD * ang2))) * bj_RADTODEG
endfunction

Aeroblyctos · Mar 26, 2011

Hmm... I would also like to know how to make a system like this. When a boss starts to cast a spell and if player 1 units look at the boss they are damaged per second. If they don't look nothing happens.

How I do that?

Magtheridon96 · Mar 27, 2011

That's a hard one..
hmmmm....

I tried making something like that to detect if 2 units are facing each other, but to no avail.. i failed...

I'll try again

--------
EDIT:
Credits to Maker for the concept:
I think this should work.
If not, the problem is with the values in the comparison

JASS:

function CheckIfFacing takes unit u,unit u2 returns boolean
    local unit u = u
    local unit u2 = u2
    local real uX = GetUnitX(u)
    local real uY = GetUnitY(u)
    local real u2X = GetUnitX(u2)
    local real u2Y = GetUnitY(u2)
    local real r = Atan2(u2Y - uY, u2X - uX)
    local real r2 = GetUnitFacing(u) * bj_DEGTORAD
    local real r3
    
    set r3 = Acos(Cos(r) * Cos(r2) + Sin(r) * Sin(r2)) * bj_RADTODEG
    
    if r3 <= 185 and r3 >= 175 then
        return true
    endif
    return false
endfunction

Aeroblyctos · Mar 27, 2011

Yea it's like tier 2 from the original help.

Garfield1337 · Mar 27, 2011

Umm...is it a channeled spell? Or when casted,applies a buff on units facing the boss?

Aeroblyctos · Mar 27, 2011

Well it's actually a channeling spell. Of course I'll add some extra twists to it, but I want the basic idea. When player 1 units look at the boss they take damage per second.

You don't need to create other things, I'll of course do that myself. Just the idea, just the idea. Thanks for your effort.

Adiktuz · Mar 27, 2011

just use Magtheridon's code inside a loop... though for MUI you would need to use indexing or structs or hashes...

Aeroblyctos · Mar 27, 2011

No need MUI and please GUI!

Adiktuz · Mar 27, 2011

I don't do much GUI now so I can't help with that... and magtheridon's code is plain jass... you can just add it to the map header and call it via GUI...

Maker · Mar 27, 2011

@Mathgeridon
set r3 = Acos(Cos(r) * Cos(r2) + Sin(r) * Sin(r2)) * bj_RADTODEG
->
set r3 = Cos(r-r2)
and remove *bj_DEGTORAD from the facing.

If r3 > 0 then
backstab!
endif

Aero, you can change the event to periodic and use this:

Attack GUI Copy
- Events
  - Unit - A unit Is issued an order targeting an object
- Conditions
- Actions
  - -------- -------------------------------------------------- --------
  - -------- Set unit variables --------
  - -------- -------------------------------------------------- --------
  - Set u1 = (Triggering unit)
  - Set u2 = (Target unit of issued order)
  - -------- -------------------------------------------------- --------
  - -------- Set location variables --------
  - -------- -------------------------------------------------- --------
  - Set p1 = (Position of u1)
  - Set p2 = (Position of u2)
  - -------- -------------------------------------------------- --------
  - -------- Get angle from "caster" to target --------
  - -------- -------------------------------------------------- --------
  - Set r1 = (Angle from p1 to p2)
  - -------- -------------------------------------------------- --------
  - -------- Get target facing --------
  - -------- -------------------------------------------------- --------
  - Set r2 = (Facing of u2)
  - -------- -------------------------------------------------- --------
  - -------- Get angle difference --------
  - -------- -------------------------------------------------- --------
  - Set r3 = (Cos((r1 - r2)))
  - -------- -------------------------------------------------- --------
  - -------- Clear leaks --------
  - -------- -------------------------------------------------- --------
  - Custom script: call RemoveLocation(udg_p1)
  - Custom script: call RemoveLocation(udg_p2)
  - -------- -------------------------------------------------- --------
  - Game - Display to Player Group - Player 1 (Red) the text: (String(r3))
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - r3 Greater than 0.00
    - Then - Actions
      - Game - Display to Player Group - Player 1 (Red) the text: Backstab!
    - Else - Actions

You don't have to set r1,r2,r3, just use Cos((angle from p1 to p2) - facing of u2)) as the condition.

Attack GUI Copy Copy
- Events
  - Time - Every 0.25 seconds of game time
- Conditions
- Actions
  - Set p1 = (Position of u1)
  - Set p2 = (Position of u2)
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (Cos(((Angle from p1 to p2) - (Facing of u2)))) Greater than 0.00
    - Then - Actions
      - Game - Display to Player Group - Player 1 (Red) the text: Paladin is backstab...
    - Else - Actions
      - Game - Display to Player Group - Player 1 (Red) the text: Paladin is NOT back...
  - Custom script: call RemoveLocation(udg_p1)
  - Custom script: call RemoveLocation(udg_p2)

Aeroblyctos · Mar 27, 2011

I see. Good, good.

But that trigger only supports ONE UNIT. I want all player 1 units to be supported.

After that I can start to construct a nice boss spell.

Maker · Mar 27, 2011

Press ESC to make the Blood Mage channel.

Start channel
- Events
  - Player - Player 1 (Red) skips a cinematic sequence
- Conditions
- Actions
  - Set u1 = Blood Mage 0000 <gen>
  - Custom script: call IssueImmediateOrder(udg_u1 , "channel")
  - Trigger - Turn on Channel <gen>

Channel
- Events
  - Time - Every 0.25 seconds of game time
- Conditions
- Actions
  - If (All Conditions are True) then do (Then Actions) else do (Else Actions)
    - If - Conditions
      - (String((Current order of u1))) Equal to channel
    - Then - Actions
      - Set p1 = (Position of u1)
      - Set r1 = (Facing of u1)
      - Custom script: set bj_wantDestroyGroup = true
      - Unit Group - Pick every unit in (Units owned by Player 1 (Red)) and do (Actions)
        
        Loop - Actions
        
        Set u2 = (Picked unit)
        
        Set p2 = (Position of u2)
        
        If (All Conditions are True) then do (Then Actions) else do (Else Actions)
        
        If - Conditions
        
        (Cos(((Angle from p1 to p2) - r1))) Greater than 0.00
        
        Then - Actions
        
        Floating Text - Create floating text that reads I'm, hurting! above u2 with Z offset 0.00, using font size 10.00, color (100.00%, 100.00%, 100.00%), and 0.00% transparency
        
        Else - Actions
        
        Floating Text - Create floating text that reads Jolly gosh, I'm fin... above u2 with Z offset 0.00, using font size 10.00, color (100.00%, 100.00%, 100.00%), 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 1.00 seconds
        
        Floating Text - Change the fading age of (Last created floating text) to 0.75 seconds
        
        Custom script: call RemoveLocation(udg_p2)
      - Custom script: call RemoveLocation(udg_p1)
    - Else - Actions
      - Trigger - Turn off (This trigger)

Aeroblyctos · Mar 27, 2011

IM HURTING!

Hmm... Still not what I wanted. Oh noes.

I mean when the "paladins" look at the blood mage... then they say "IM HURTING!".

And if they don't look blood mage: Jolly gosh!

Maker · Mar 27, 2011

Right...then do this:

(Cos(((Angle from p2 to p1) - (Facing of u2)))) Greater than 0.00

Cos returns values in -1...1 range. So >0 equates to half circle.

Aeroblyctos · Mar 27, 2011

I did, doesn't work. :<

Maker · Mar 28, 2011

Not that it isn't
Cos(angle) - facing
it's
Cos(angle-facing)

Aeroblyctos · Mar 28, 2011

((Cos((Angle from p2 to p1))) - (Facing of u2)) Greater than 0.00

I don't see any wrong here. It's 100% same...

What the hell? Help the noob.

I've always hated all those mathematical calculations in school.

Maker · Mar 28, 2011

(Cos(((Angle from p2 to p1) - (Facing of u2)))) Greater than 0.00

((Cos((Angle from p2 to p1))) - (Facing of u2)) Greater than 0.00

The brackets. First one is correct, second one is not. First calculate angle from p2 to p1, then reduce facing of u2 from that. Then take cos of the whole thing.

In the editor:
New action -> set variable
Select cos function.
Select arithmetic inside the cos.
For the first part, select angle between points.
For the second part choose facing of unit.

Aeroblyctos · Mar 31, 2011

Ahh, okay. Now it works!

Great. With this superb trigger I can create some really nice boss tricks. Thanks to everyone for the great help!

How to detect backstab?

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