moving alien ai in inform 7

story.ni

"alien" by "whiteline"

the sick bay is a room.

the corridor is a room.

the freezer is a room.

the sick bay is west of the corridor.

the freezer is north of the corridor.

the player is in the sick bay.

a chaser is a kind of animal.

a chaser is either chasing or wandering. A chaser is usually wandering.

a chaser has a room called the destination.

a person can be hidden. A person is usually not hidden.


the alien is a chaser in the freezer.

whistling is an action applying to nothing. understand "whistle" as whistling.

a carry out whistling rule:
	repeat with c running through chasers:
		now the destination of c is the location of the player;
		now c is chasing;
	
Hiding relates a person to a thing. The verb to hide in means the hiding relation. The verb to be hidden by implies the reversed hiding relation.

Every turn (this is the implied hiding rule):
	repeat with p running through people:
		if p is contained by a thing (called the hiding spot):
			now p is hidden by the hiding spot.
		
hiding is an action applying to one visible thing. understand "hide using [a thing]" as hiding.

a carry out hiding rule:
	now the player is hidden;
	now the player is hiding in the noun.
	
before going when the player is hidden:
	now the player is not hidden;
	continue the action.
	
every turn (this is the alien behavior rule):
	repeat with c running through chasers:
		if c is in the location of the player:
			if the player is not hidden:
				say "boo!";
			else:
				if c is chasing:
					now c is wandering;
		if c is chasing:
			let chasedir be the best route from the location of c to the location of the player;
			try c going chasedir;
		else:
			let wanderdir be the best route from the location of c to a random room adjacent to the location of c;
			try c going wanderdir;

The implied hiding rule is listed before the alien behavior rule in the every turn rules.