[Solved] If unit is facing unit condition.

[Yours Truly]

How do you detect if deez unit face dat unit?

 

[pOke]

[Snippet] UnitOrientation

 

[Yours Truly]

[Snippet] UnitOrientation

Can you explain how I can use that system? Its a bit confusing and I can't do custom scripts without proper instructions or an example.

 

[pOke]

• Custom script: call IsUnitFacingUnit(DeezUnit, DatUnit, angleMargin)

Where angleMargin is how strictly "facing" they need to be.

 

[Yours Truly]

• Custom script: call IsUnitFacingUnit(DeezUnit, DatUnit, angleMargin)

Where angleMargin is how strictly "facing" they need to be.

K,thanks for your help.
(lol, deez unit and dat unit xd )

 

[KILLCIDE]

Well given that IsUnitFacingUnit(DeezUnit, DatUnit, angleMargin) returns a boolean, you can just put it inside some JASS if statements.

• Custom script: if (IsUnitFacingUnit(DeezUnit, DatUnit, angleMargin)) then
• -------- do stuff --------
• Custom script: endif

Alternatively, if you want to avoid using a lot of custom script, you can store it into a global boolean variable.

• Custom script: set udg_SomeBoolean = IsUnitFacingUnit(DeezUnit, DatUnit, angleMargin)
• If (All Conditions are True) then do (Then Actions) else do (Else Actions)
  • If - Conditions
    • SomeBoolean Equal to True
  • Then - Actions
    • -------- unit is facing unit; do stuff--------
  • Else - Actions
    • -------- unit is not facing unit --------

 

[Yours Truly]

Well given that IsUnitFacingUnit(DeezUnit, DatUnit, angleMargin) returns a boolean, you can just put it inside some JASS if statements.

• Custom script: if (IsUnitFacingUnit(DeezUnit, DatUnit, angleMargin)) then
• -------- do stuff --------
• Custom script: endif

Alternatively, if you want to avoid using a lot of custom script, you can store it into a global boolean variable.

• Custom script: set udg_SomeBoolean = IsUnitFacingUnit(DeezUnit, DatUnit, angleMargin)
• If (All Conditions are True) then do (Then Actions) else do (Else Actions)
  • If - Conditions
    • SomeBoolean Equal to True
  • Then - Actions
    • -------- unit is facing unit; do stuff--------
  • Else - Actions
    • -------- unit is not facing unit --------

My trigger doesn't actually need a lot of custom scripts or an "Else" action because it only checks if DeezUnit is facing DatUnit. If DeezUnit is not facing DatUnit however,nothing will be triggered. So no "Else" action means less lines.

 

[KILLCIDE]

I'm sorry I'm a little confused, but simply calling the function as pOke did isn't going to do anything. You have to do either one of the suggestions I showed you

 

[Yours Truly]

I'm sorry I'm a little confused, but simply calling the function as pOke did isn't going to do anything. You have to do either one of the suggestions I showed you

I know lel.
But just because he didn't write it in a condition format doesn't mean I don't know how to convert it into one.

 

[Wietlol]

That cannot be said for everyone... and ussually, we do not care who asks the question, we just care about the question.

 

[Dr Super Good]

Since a unit might never perfectly face another unit a tolerance is needed. One can use the properties of cosine for this as it is symmetric around 0 degrees and aliases so simulates +/- tolerances well.

Say one wants to test that unit A is facing unit B within +/- X degrees...
First get the angle from A to B. Then subtract the facing of A from it. This gives an alias of the delta angle that B is at with respect to the current facing of A. The condition uses this delta angle to test if it is within the +/- angle tolerance of X. This is done by putting the delta angle through cosine and then checking if the result is greater than or equal to the cosine of X. If this test passes then B is within the specified tolerance of X from the facing of A.

(cosine((angle from A to B) - (facing of A))) greater than or equal to (cosine(X))

The (cosine(X)) term can be pre-computed as a constant for speed, hence only 1 cosine and 1 arctangent (2 parameter geometric version) are needed. In normal computing cosine is reasonably expensive to compute so a modular angle test is normally faster. This is the opposite with JASS (what GUI compiles to and WC3 runs) where the expense of cosine is masked by the JASS virtual machine overhead and is significantly less than emulating modular real. Hence this is the fastest approach for JASS, but probably is not in real programming languages.