Engine
Class LineOfSightTrigger

Core.Object
   |
   +--Engine.Actor
      |
      +--Engine.Triggers
         |
         +--Engine.LineOfSightTrigger

00001	//=============================================================================
00002	// LineOfSightTrigger
00003	// triggers its event when player looks at it from close enough
00004	// ONLY WORKS IN SINGLE PLAYER (or for the local client on a listen server)
00005	// You could implement a multiplayer version using a tick function and PlayerCanSeeMe(),
00006	// but that would have more performance cost
00007	//=============================================================================
00008	class LineOfSightTrigger extends Triggers
00009		native;
00010	
00011	var() float MaxViewDist;	// maximum distance player can be from this trigger to trigger it
00012	var   float OldTickTime;
00013	var() bool  bEnabled;
00014	var	  bool  bTriggered;		
00015	var() name	SeenActorTag;	// tag of actor which triggers this trigger when seen
00016	var	  actor SeenActor;
00017	var() int MaxViewAngle;		// how directly a player must be looking at SeenActor center (in degrees)
00018	var float RequiredViewDir;	// how directly player must be looking at SeenActor - 1.0 = straight on, 0.75 = barely on screen
00019	
00020	function PostBeginPlay()
00021	{
00022		Super.PostBeginPlay();
00023	
00024		RequiredViewDir = cos(MaxViewAngle * PI/180);
00025		if ( (SeenActorTag != '') && (SeenActorTag != 'None') )
00026			ForEach AllActors(class'Actor',SeenActor,SeenActorTag)
00027				break;
00028	}
00029	
00030	event PlayerSeesMe(PlayerController P)
00031	{
00032		TriggerEvent(Event,self,P.Pawn);
00033		bTriggered = true;
00034	}
00035	
00036	function Trigger( actor Other, Pawn EventInstigator )
00037	{
00038		bEnabled = true;
00039	}
00040	
00041	defaultproperties
00042	{
00043	     MaxViewDist=3000.000000
00044	     bEnabled=True
00045	     MaxViewAngle=15
00046	     bCollideActors=False
00047	}