state = global.rain_start_state
i = 0
while i < map_width()
{
    a = 0
    hit_ceiling = 0
    while a < map_height() and hit_ceiling = 0
    {
        if collision_line(i,a+state,i,a+state+20,Obstacle, true, true) == 1
        {
            hit_ceiling = 1
        }
        draw_line_width_color(i, a+state, i, a+state+10, 1, c_aqua, c_aqua)
        a += 20
    }

    i += 20
    state += 10

    if state == 20
    {
        state = 0
    }
}
if global.rain_counter == 16
{
    global.rain_start_state += 10
    if global.rain_start_state == 20
    {
        global.rain_start_state = 0
    }
    global.rain_counter = 0
}
else
{
    global.rain_counter += 1
}