Improved_Monster_AI_ACS_Script.txt

This is the script I use to get the monster to predict the player's movements and hence 'lead their shots.' 
It assumes the player is travelling in a circle at a constant speed (which is a common tactic players use in the hexen games) 
The distsqr variable is redundant and should really be removed.

**Beginning of script**
//I've changed this script to return the current shooter's angle if the target it too far away (this means you must you A_FaceTarget in order for this to work.)
// Yes I could use GetActorAngle instead of VectorAngle but I'd rather not mess too much with the code.

Script "Demon1CircularAngle" (Void)
{

	int OldActiID = ActivatorTID();
	Thing_ChangeTID(0,UniqueTid(1000,""));
	int NewActiID = ActivatorTID();

	SetActivatorToTarget(0);

	int OldTargID = ActivatorTID();
	Thing_ChangeTID(0,UniqueTid(1000,""));
	int NewTargID = ActivatorTID();

	int angle, dx, dy, velx, vely, dist, cross, distsqr, originalAngle;

	dx = (GetActorX(NewTargID)-GetActorX(NewActiID));
	dy = (GetActorY(NewTargID)-GetActorY(NewActiID));
	dist = VectorLength(dx,dy)>>16;
	velx = GetActorVelX(NewTargID)>>16;
	vely = GetActorVelY(NewTargID)>>16;
	cross = -(velx*(dy>>16)) + (vely*(dx>>16));
	distsqr = dist*dist;
	
	angle = ( ( ( (360*cross)/(94*dist) ) ) )+((VectorAngle(dx,dy))*360/65536);
	
	originalAngle = GetActorAngle(NewActiID)*360/65536;    //Get's the current's shooter angle
	
	Thing_ChangeTID(NewTargID,OldTargID);
	Thing_ChangeTID(NewActiID,OldActiID);
	
	//if the shooter is far away, it shoots directly at the player.  This is so that monster does not shoot in weird directions when fighting through a portal.
	if(dist > 3000)
	{
	SetResultValue(originalAngle);			
	}
	else
	{
	SetResultValue(angle);
	}
	
	//print(s:"angle ",d: originalAngle, s:"   cross ",d: cross, s:"   dist ",d: dist);

	
}