OCDonut: donut.c opencomputers port

-- Donut.C Ported to opencomputers by nonogamer9
-- Original C Code By Andy Sloane
local component = require("component")
local gpu = component.gpu
local term = require("term")
local math = require("math")

local A, B = 0, 0

local function main()
  while true do
    local z = {}
    local b = {}

    for i = 1, 1760 do
      b[i] = ' '
      z[i] = 0
    end

    for j = 0, 6.28, 0.07 do
      for i = 0, 6.28, 0.02 do
        local sini = math.sin(i)
        local cosj = math.cos(j)
        local sinA = math.sin(A)
        local sinj = math.sin(j)
        local cosA = math.cos(A)
        local cosj2 = cosj + 2
        local mess = 1 / (sini * cosj2 * sinA + sinj * cosA + 5)
        local cosi = math.cos(i)
        local cosB = math.cos(B)
        local sinB = math.sin(B)
        local t = sini * cosj2 * cosA - sinj * sinA
        local x = math.floor(40 + 30 * mess * (cosi * cosj2 * cosB - t * sinB))
        local y = math.floor(12 + 15 * mess * (cosi * cosj2 * sinB + t * cosB))
        local o = x + 80 * y
        local N = math.floor(8 * ((sinj * sinA - sini * cosj * cosA) * cosB - sini * cosj * sinA - sinj * cosA - cosi * cosj * sinB))

        if y < 22 and y > 0 and x > 0 and x < 80 and mess > z[o + 1] then
          z[o + 1] = mess
          b[o + 1] = string.sub(".,-~:;=!*#$@", N > 0 and N or 1, N > 0 and N or 1)
        end
      end
    end

    term.setCursor(1, 1)
    for k = 1, 1760 do
      if k % 80 == 0 then
        term.write("\n")
      else
        term.write(b[k])
      end
    end

    A = A + 0.08
    B = B + 0.06

    os.sleep(0.03) -- Adding a small delay to make the animation smoother
  end
end

term.clear()
main()