--Ported from javascript

local particles = {}

local numberOfSprites = 5
local spawnCooldown = 0

local gfx = {}
for i=1, numberOfSprites do
	gfx[i] = Graphics.loadImage(i .. ".png")
end

local function sin(d)
	return math.sin(d*0.017453292519943)
end

function onDraw()
	--Red overlay:
	Graphics.glDraw{vertexCoords={0, 0, 0, 600, 800, 0, 800, 600}, color={1, 0, 0, 0.133}, primitive=Graphics.GL_TRIANGLE_STRIP, priority = 1}

	if spawnCooldown <= 0 then
		spawnCooldown = math.random(3)

		spawnParticle(math.random()*832 - 16, 600) --Up to 16px off either end of screen
	end

	Text.print(mem(0x00B250E2, FIELD_WORD),0,0) --Line to check if paused
	if true then
		for i,part in ipairs(particles) do
			if part ~= -1 then
				part.x = part.baseX + sin(part.timer*5)*40        --Wavy effect
				part.y = (part.y + 100) * (1 + 1/part.yV) - 100   --Converging effect
				part.timer = part.timer + 0.65

				if part.y < -32 then
					particles[i] = -1
				end

				Graphics.glDraw{vertexCoords={part.x, part.y, part.x + 6, part.y, part.x + 6, part.y + 6, part.x, part.y + 6}, texture=gfx[part.sprite], textureCoords={0, 0, 1, 0, 1, 1, 0, 1}, color={1,1,1,0.8}, primitive=Graphics.GL_TRIANGLE_FAN, priority = -98}
				--Graphics.drawImage(gfx[part.sprite], part.x, part.y)
			end
		end
	end

	spawnCooldown = spawnCooldown - 1
end

function spawnParticle(x, y)
	local obj = {x=x, y=y}
	obj.sprite = math.random(numberOfSprites)

	obj.xV = 0
	obj.yV = math.random(-110, -70)
	obj.baseX = x
	obj.timer = 0

	table.insert(particles, obj)
end