arrow: added an entity for pointing at things

entities/arrow.lua

@@ -0,0 +1,31 @@
+Class = require 'hump.class'
+require 'entities/entity'
+
+local ARROW_IMG = love.graphics.newImage("resources/graphics/arrow-up.png")
+local ARROW_QUAD = love.graphics.newQuad(0, 0, 90, 90, 90, 90)
+
+Arrow = Class {
+    __includes = Entity,
+    
+    init = function(self, x, y, level, r, g, b)
+	Entity.init(self, x, y, level)
+	self.pointX = 45
+	self.pointY = 90
+	self.r = r
+	self.g = g
+	self.b = b
+    end;
+
+    setX = function(self, x)
+	self.x = x
+    end;
+
+    setY = function(self, y)
+	self.y = y
+    end;
+
+    draw = function(self)
+	love.graphics.setColor(self.r, self.g, self.b);
+        love.graphics.draw(ARROW_IMG, ARROW_QUAD, self.x + self.pointX, self.y + self.pointY, 0, 1, 1, 90, 90)
+    end
+}