Mothback/code/entities/arrow.lua

Arrow = Entity:New()

function Arrow:New(x,y,rotation,speed)
	local o = Entity:New(x,y)

	o.type = "arrow"

	o.pos = {x = x, y = y}
	o.speed = speed or 10
	o.sprite_rotation = rotation or 0
	o.vel = {
		x = o.speed * math.cos(o.sprite_rotation),
		y = o.speed * math.sin(o.sprite_rotation)
	}
	o.sprite_offset = {x = 13, y = 1}
	o.stuck = false
	o.illuminated = true

	-- animations
	o.body = Animation:New(animation.kupo.arrow)

	o.boxCollision = {
		from = {x = -0.5, y = -0.5}, --gameworld pixels
		to = {x = 0.5, y = 0.5} -- gameworld pixels
	}

	table.insert(LoadedObjects.Entities,o)
	o.id = #LoadedObjects.Entities

	setmetatable(o, self)
	self.__index = self
	return o
end

function Arrow:DrawBackground()
	self:Draw(self.body)
end

function Arrow:DoPhysics()
	if not self:isCollidingAt(self.pos.x + self.vel.x, self.pos.y, LoadedObjects.Collisions) then
		self.pos.x = self.pos.x + self.vel.x
	else
		self.stuck = true
	end
	if not self:isCollidingAt(self.pos.x, self.pos.y + self.vel.y, LoadedObjects.Collisions) then
		self.pos.y = self.pos.y + self.vel.y
	else
		self.stuck = true
	end
	if self.stuck then
		self.pos.x = self.pos.x + self.vel.x * (2/3)
		self.pos.y = self.pos.y + self.vel.y * (2/3)
		self.vel.x = 0
		self.vel.y = 0
	end
end