Check if unit is in front of certain unit

[Leazy]

Hello! I need a way to check if udg_Target is in front of udg_Caster, how do I do this? This is what I got so far (don't know if it works correctly):

• Check Facing
  • Events
  • Conditions
  • Actions
    • Set Point[1] = (Position of Target)
    • Set Point[2] = (Position of Caster)
    • Set Real[1] = (Angle from Point[1] to Point[2])
    • Set Real[2] = (Facing of Caster)
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • And - All (Conditions) are true
          • Conditions
            • And - All (Conditions) are true
              • Conditions
                • Real[1] Greater than or equal to (Real[2] - 90.00)
                • Real[1] Less than or equal to (Real[2] + 90.00)
      • Then - Actions
        • Set Behind = True
      • Else - Actions
        • Set Behind = False
    • Custom script: call RemoveLocation (udg_Point[1])
    • Custom script: call RemoveLocation (udg_Point[2])

 

[merlinds]

I think that`s the idea, but +90/-90 is a very great angle, it will work even if the unit is in the side of the caster. i suggest you to reduce those angles to 45.

 

[Trollvottel]

You Should know that (Angle from Point[1] to Point[2]) returns values between -180° and 180° (as far as i remember)
so you should convert that to 0-360° first of all.
Then you should get the difference between Real[1] and Real[2] and get it's absolute value.
then you can check if it is smaller than 90° or not.

 

[tommerbob]

An easier way is to set 3 points, Point A for caster, Point B for target, Point C X distance in front of target. Then check the distance. If target is closer to Point C than the caster, it means he is behind his target.

 

[Sgqvur]

I think what you have will work but you will need to add 360 to Real[1] (the angle between points) and then take the remainder of it with 360 so like Trollvottel wrote you'll end up with an angle [0, 359].

 

[Trollvottel]

You can aswell just check if it is smaller than 0 and if so do Real[1] = 360+Real[1]

 

[GFreak45]

just a heads up, this part:

• If - Conditions
  • And - All (Conditions) are true
    • Conditions
      • And - All (Conditions) are true
        • Conditions
          • Real[1] Greater than or equal to (Real[2] - 90.00)
          • Real[1] Less than or equal to (Real[2] + 90.00)

does not need all of those and conditions

• If - Conditions
  • Real[1] Greater than or equal to (Real[2] - 90.00)
  • Real[1] Less than or equal to (Real[2] + 90.00)

should work

 

[Leazy]

Thank you very much for all the help guys!

This is what I got so far:

• Check Facing
  • Events
  • Conditions
  • Actions
    • Set Point[1] = (Position of Target)
    • Set Point[2] = (Position of Caster)
    • Set Real[1] = (Angle from Point[1] to Point[2])
    • Set Real[2] = (Facing of Caster)
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • Real[1] Less than 0.00
      • Then - Actions
        • Set Real[1] = (Real[1] + 360.00)
      • Else - Actions
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • Real[1] Greater than or equal to (Real[2] - 45.00)
        • Real[1] Less than or equal to (Real[2] + 45.00)
      • Then - Actions
        • Set InFront = False
      • Else - Actions
        • Set InFront = True
    • Custom script: call RemoveLocation (udg_Point[1])
    • Custom script: call RemoveLocation (udg_Point[2])

Only detect that the target is behind when it's as far away (facing-wise) as possible. I want it to detect that it's behind anywhere between this range: (tried increasing and decreasing the 45 values, but that messed things up)

 

[Sgqvur]

I think you've reversed:

• Then - Actions
  • Set InFront = False
  • Else - Actions
    • Set InFront = True

I think it should be:

• Then - Actions
  • Set InFront = True
  • Else - Actions
    • Set InFront = False

 

[Leazy]

Okey, I got this now:

• Check Facing
  • Events
  • Conditions
  • Actions
    • Set Point[1] = (Position of Target)
    • Set Point[2] = (Position of Caster)
    • Set Real[1] = (Angle from Point[1] to Point[2])
    • Set Real[2] = (Facing of Caster)
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • Real[1] Less than 0.00
      • Then - Actions
        • Set Real[1] = (Real[1] + 360.00)
      • Else - Actions
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • Real[1] Greater than or equal to (Real[2] - 45.00)
        • Real[1] Less than or equal to (Real[2] + 45.00)
      • Then - Actions
        • Set InFront = True
      • Else - Actions
        • Set InFront = False
    • Custom script: call RemoveLocation (udg_Point[1])
    • Custom script: call RemoveLocation (udg_Point[2])

I use a condition like this:
InFront Equal to False
If InFront = false I send a error message saying that you need to face the target and skips remaning actions. I get the error message despite facing, and at some random facings etc. Works in front and if the target is exactly behind etc. Anyone know why this bugs so much?

 

[Sgqvur]

Hm... shouldn't the angle be from the caster towards the target so

• Set Real[1] = (Angle from Point[1] to Point[2])

becomes

• Set Real[1] = (Angle from Point[2] to Point[1])

 

[gameman]

I made out my own trigger. I don't think I tested it enough (seems to have an occasional bug). But it works!

You'll need to adjust the values, and clean it up.

EDIT: Oh, sorry, I made my trigger with cone detection, not the way you wanted it. Well, maybe this will be of some use.

• Working
  • Events
    • Unit - A unit Starts the effect of an ability
  • Conditions
    • (Ability being cast) Equal to Detect
  • Actions
    • Set Range = 500.00
    • Set Detector = (Triggering unit)
    • Set Detected = (Target unit of ability being cast)
    • Set DetectorFacing = (Facing of Detector)
    • Set Points[1] = (Position of Detector)
    • Set Points[3] = (Points[1] offset by Range towards (DetectorFacing + 30.00) degrees)
    • Set Points[4] = (Points[1] offset by Range towards (DetectorFacing - 30.00) degrees)
    • Set Points[5] = (Position of Detected)
    • Custom script: //===================================
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • And - All (Conditions) are true
          • Conditions
            • (Distance between Points[1] and Points[5]) Greater than or equal to 0.00
            • (Distance between Points[4] and Points[5]) Greater than or equal to 0.00
            • (Distance between Points[3] and Points[5]) Greater than or equal to 0.00
            • And - All (Conditions) are true
              • Conditions
                • (Distance between Points[1] and Points[5]) Less than Range
                • (Distance between Points[4] and Points[5]) Less than Range
                • (Distance between Points[3] and Points[5]) Less than Range
      • Then - Actions
        • Set Correct_Placement = True
      • Else - Actions

 

[Leazy]

Works now, thanks for all the help guys!!