Sandstorm flow

local sandstorm = {}

local function moveParticles()
    local group = sandstorm.group
    for i = 1, group.numChildren do
        local particle = group[i]
        particle.x = particle.x + math.random(-1, 1)
    particle.y = particle.y + 1
    end
end

function sandstorm.new(quantity)
    local random = math.random
    sandstorm.group = display.newGroup()
    local group = sandstorm.group
    for i = 1, quantity do
        local particle = group[i]
        particle = display.newRect(group, 0, 0, 1, 1)
        particle:setReferencePoint(display.TopLeftReferencePoint)
        particle.x, particle.y = random(display.screenLeft, display.screenRight), random(display.screenTop, display.screenBottom)
        particle:setFillColor(random(232, 255) , random(183, 213), random(117, 147))
    end
    group:addEventListener("enterFrame", moveParticles)
    return group
end

return sandstorm