comets.lua

comet = {}

for i = -10, 10, 4 do

	table.insert(comet, i)
end

function comet:new()

	self.e = true
	
	self.dx = self[math.random(#self)]
	self.dy = self[math.random(#self)]

	if math.random(2) > 1 then

		self.x = love.graphics.getWidth()/2 - self.dx/math.abs(self.dx) * love.graphics.getWidth()/2
		self.y = math.random(0, love.graphics.getHeight())
	else

		self.x = math.random(0, love.graphics.getWidth())
		self.y = love.graphics.getHeight()/2 - self.dy/math.abs(self.dy) * love.graphics.getHeight()/2
	end
end

function comet:update(dt)
	
	self.x = self.x + self.dx * dt * 0x40
	self.y = self.y + self.dy * dt * 0x40

	if self.x < - love.graphics.getWidth()	or self.x > love.graphics.getWidth() * 2
	or self.y < - love.graphics.getWidth()	or self.y > love.graphics.getHeight() * 2 then
	
		self.e = nil
	end
end

function comet:draw()

	for i = 16, 1, -1 do
	
		local c = 0x80/i
		
		love.graphics.setColor(0xff, 0xff, 0xff, c)
		
		love.graphics.line(
			self.x, self.y,
			self.x - i * self.dx, self.y - i * self.dy
		)
	end
end