Particles.lua

particles = {}

function particles.new(r, g, b, a, size)

	local self = {}

	self.r = r or 255
	self.g = g or 255
	self.b = b or 255
	self.a = a or 255
	self.size = size
	self.particles = {}

	local random = love.math.random

	self.emit_single = function (x, y, vx, vy, l)
		table.insert(self.particles, {x=x,y=y,size=0.5+random(),vx=vx,vy=vy,life=l})
	end

	self.emit = function (x, y, vx, vy, l, r, c)
		for i = 1, c do
			self.emit_single(x,y,vx + r * (random() - 0.5), vy + r * (random() - 0.5), l)
		end
	end

	self.update = function (ts)
		for i, p in ipairs(self.particles) do
			p.life = p.life - 1
			if p.life <= 0 then
				table.remove(self.particles, i)
			else
				p.x = p.x + p.vx * ts
				p.y = p.y + p.vy * ts
			end
		end
	end

	self.draw = function ()
		local rect = love.graphics.rectangle
		love.graphics.setColor(self.r, self.g, self.b, self.a)
		for i, p in ipairs(self.particles) do
			rect("fill", p.x - 2, p.y - 2, p.size * self.size, p.size * self.size)
		end
	end

	return self
end

return particles