Allow specifying chamber locations relative to any map edge or corner…

…, or relative to the map center

data/lua/cave_map_generator.lua

@@ -74,6 +74,27 @@ function callbacks.generate_map(params)
 	for chamber in wml.child_range(params, "chamber") do
 		local chance = tonumber(chamber.chance) or 100
 		local x, y = MG.random_location(chamber.x, chamber.y)
+		if chamber.relative_to == "top-right" then
+			x = map.w - x
+		elseif chamber.relative_to == "bottom-right" then
+			x = map.w - x
+			y = map.h - y
+		elseif chamber.relative_to == "bottom-left" then
+			y = map.h - y
+		elseif chamber.relative_to == "top-middle" then
+			x = (map.w / 2) + x
+		elseif chamber.relative_to == "bottom-middle" then
+			x = (map.w / 2) + x
+			y = map.h - y
+		elseif chamber.relative_to == "middle-left" then
+			y = (map.h / 2) + y
+		elseif chamber.relative_to == "middle-right" then
+			y = (map.h / 2) + y
+			x = map.w - x
+		elseif chamber.relative_to == "center" then
+			x = (map.w / 2) + x
+			y = (map.h / 2) + y
+		end -- Default is "top-left" which means no adjustments needed
 		local id = chamber.id
 		if chance == 0 or random(100) > chance then
 			-- Set chance to 0 so that the scenario generator can tell which chambers were used

data/multiplayer/scenarios/Random_Scenario_Cave.cfg

@@ -89,12 +89,13 @@ Rb,Rb,Rb,Rb,Rb,Rb,Rb,Rb^Uf,Rb^Ii,Sm,Sm,Uue,Rb^Fetd,Rb^Fdw#enddef
 	[/road_cost]
 #enddef
 
-#define PLAYER_CHAMBER NUMBER X Y
+#define PLAYER_CHAMBER NUMBER X Y REL
 	[chamber]
 		id=player_{NUMBER}
 		require_player={NUMBER}
 		x={X}
 		y={Y}
+		relative_to={REL}
 		size=5
 		jagged=2
 		[item_location]
@@ -169,10 +170,10 @@ Rb,Rb,Rb,Rb,Rb,Rb,Rb,Rb^Uf,Rb^Ii,Sm,Sm,Uue,Rb^Fetd,Rb^Fdw#enddef
             jagged=12
             terrain_clear=Wwg
         [/chamber]
-        {PLAYER_CHAMBER 1 3..10 3..10}
-        {PLAYER_CHAMBER 2 30..37 30..37}
-        {PLAYER_CHAMBER 3 3..10 30..37}
-        {PLAYER_CHAMBER 4 30..37 3..10}
+        {PLAYER_CHAMBER 1 3..10 3..10 top-left}
+        {PLAYER_CHAMBER 2 3..10 3..10 bottom-right}
+        {PLAYER_CHAMBER 3 3..10 3..10 bottom-left}
+        {PLAYER_CHAMBER 4 3..10 3..10 top-right}
     [/generator]
 [/multiplayer]