local str = "abcdefg\noaskdoikas dsd\n hrllo"
local tbl = {}
local length = #str

for i = 1, length do
    table.insert(tbl, {char = str:sub(i, i), color = HSVToColor((i / #str) * 360, 1, 1)})
end

surface.CreateFont("LOL", {
    font = "Arial",
    size = 800,
})

hook.Add("HUDPaint", "test", function()
    surface.SetFont("LOL")

    local w, h = ScrW(), ScrH()
    local last_w, last_h = 0, 0

    for i, data in pairs(tbl) do
        surface.SetTextPos(w/2 + last_w, h/2 + last_h)

        surface.SetTextColor(data.color)
        surface.DrawText(data.char)

        local w, h = surface.GetTextSize(data.char)
        last_w = last_w + w

        if data.char == "\n" then
            last_h = last_h + h / 2
            last_w = 0
        end
    end
end)