--[[Utility classes]]

mod = ...

class Vec3
	new:(x,y,z) =>
		@x = x or 0
		@y = y or 0
		@z = z or 0

class Vec2
	new: (x,y) =>
		@x = x or 0
		@y = y or 0
	area: () => math.abs(@x * @y)
	__sub: (a,b) ->
		Vec2(a.x-b.x,a.y-b.y)
	__add: (a,b) ->
		Vec2(a.x + b.x, a.y + b.y)

--getmetatable(Vec2).__sub = (a,b) ->
	--Vec2(a.x-b.x,b.x-b.y) 

drawable = (c) ->
	assert(c.sprite or c.anim)

anim_co = (a) ->
	while true
		a.keyframe = math.floor(am.current_time()*4) % #(a.anim)
		assert(a.anim[a.keyframe + 1], "Failed to find an appropriate image to draw.")
		a.node\replace("sprite",am.sprite(a.anim[a.keyframe + 1])\tag "sprite")
		coroutine.yield()


mod["Vec2"] = Vec2
mod["Vec3"] = Vec3
mod