note blocks and sticky test

note.lua

@@ -0,0 +1,30 @@
+require "entity"
+
+-- An editor annotation dropped onto the grid. A Note is a normal Entity (so it
+-- serializes, places and hit-tests like any other object) that carries a bit of
+-- author text. It is deliberately non-collidable — the player passes straight
+-- through it — and only ever renders as a translucent icon while the editor is
+-- available (DEBUG) and notes are toggled on (see NOTES_VISIBLE / Room:draw).
+Note = class("Note", Entity)
+
+local noteSprite = loadSprite("art/_debug/notepad.png")
+
+function Note:initialize(x, y, text)
+	self.text = text or ""
+	self.saveClass = "note"
+	Entity.initialize(self, {
+		x = x, y = y,
+		color = "white",   -- representative only; Note:draw ignores channels
+		collision = "none",
+		sprite = noteSprite,
+	})
+end
+
+-- Drawn once (not per-channel) as a faint overlay. Called directly from the
+-- room's note pass, so it takes no channel argument.
+function Note:draw()
+	love.graphics.setColor(1, 1, 1, 0.85)
+	local p = self:getDrawPos()
+	love.graphics.draw(self.sprite, p.x, p.y, 0, drawScale, drawScale)
+	love.graphics.setColor(1, 1, 1, 1)
+end