add dialog

npc.lua

@@ -1,14 +1,22 @@
-npc = class("npc", Entity)
+require "entity"
+require "dialogable"
 
-function npc:initialize(x, y, color, name)
+-- A dialogable placed in the world. Signs, npcs and artifacts will each be a
+-- small Entity subclass that includes Dialogable and names its own book; Sign is
+-- the first. It just picks art + a story — the talking lives in the mixin.
+Sign = class("Sign", Entity)
+Sign:include(Dialogable)
+
+function Sign:initialize(x, y)
+	self.book = startSignBook
 	Entity.initialize(self, {
-		x = x,
-		y = y,
-		color = color,
+		x = x, y = y,
+		color = "red",            -- representative only; sprites are per-channel
 		collision = "unmoveable",
-		sprite = sprites.npc[name][color],
-		onBump = function(self)
-			
-		end,
+		sprites = {
+			red   = loadSprite("art/npc/start_sign_r.png"),
+			green = loadSprite("art/npc/start_sign_g.png"),
+			blue  = loadSprite("art/npc/start_sign_b.png"),
+		},
 	})
-end
+end