function spawn(s)
    Spawn.configure(s,"etincelle.png", 4);
    for i = 0, 100 do
        Spawn.createParticle(s,0,0,40*i,0,3,true)
    end
    Spawn.start(s,0.01)
end


function trajectoire(particle)

    lifeTime, age, frameTime = Particle.getAge(particle);
    if age >= lifeTime/2 then
        transparence = 255 * 2 * age / lifeTime
        if transparence > 510 then
            transparence = 510
        end
        Particle.setColor(particle,255,255- transparence,255 - transparence, 255 - transparence)
    end
    angle = Particle.getAngle(particle);
    speed = Particle.getSpeed(particle);
    Particle.turn(particle, 10);
    x = Particle.getX(particle);
    y = Particle.getY(particle);
    Particle.setPosition(particle, x + math.cos(angle*math.pi/180)*speed, y + math.sin(angle*math.pi/180)*speed);
end

enregistrerParticule("nuage", trajectoire, spawn)