ZAS overhaul

code/ZAS/_docs.dm

@@ -0,0 +1,35 @@
+/*
+
+Zone Air System:
+
+This air system divides the station into impermeable areas called zones.
+When something happens, i.e. a door opening or a wall being taken down,
+zones equalize and eventually merge. Making an airtight area closes the connection again.
+
+Control Flow:
+Every air tick:
+	Marked turfs are updated with update_air_properties(), followed by post_update_air_properties().
+	Edges, including those generated by connections in the previous step, are processed. This is where gas is exchanged.
+	Fire is processed.
+	Marked zones have their air archived.
+
+Important Functions:
+
+air_master.mark_for_update(turf)
+	When stuff happens, call this. It works on everything. You basically don't need to worry about any other
+	functions besides CanPass().
+
+Notes for people who used ZAS before:
+	There is no connected_zones anymore.
+	To get the zones that are connected to a zone, use this loop:
+	for(var/connection_edge/zone/edge in zone.edges)
+		var/zone/connected_zone = edge.get_connected_zone(zone)
+
+*/
+
+//#define ZASDBG
+//#define ZLEVELS
+
+#define AIR_BLOCKED 1
+#define ZONE_BLOCKED 2
+#define BLOCKED 3