Calculator

term.setCursorPos(1, 1)
term.setBackgroundColor(colors.white)
term.clear()

-- Hack OS - v0.19
-- By FoxWorn3365


-- APPUNTI
-- Configurazioni sistema: .localConf
-- Configurazioni pubbliche: .publicConf
-- Immagini: /Hack/images/
-- APP: /Hack/programmi/
-- App di esempio:
--   Directory: /Hack/programmi/fileManager/
--   Icona: /Hack/programmi/fileManager/app.ico
--   File da eseguire: /Hack/programmi/fileManager/exec.luaDir
--   Configurazioni (facoltativo) (OBBLIGO AUTOGENERAZIONE): /Hack/programmi/fileManager/conf.public
--   Nome dell'APP (massimo 4 caratteri): /Hack/programmi/fileManager/app.name
--   API: https://fcosma.it/hackos/api

maxw, maxh = term.getSize()
local function drawPixelInternal(xPos, yPos)
    term.setCursorPos(xPos, yPos)
    term.write(" ")
end

local tColourLookup = {}
for n = 1, 16 do
    tColourLookup[string.byte("0123456789abcdef", n, n)] = 2 ^ (n - 1)
end

function drawFilledBox(startX, startY, endX, endY, nColour)
    if type(startX) ~= "number" or type(startX) ~= "number" or type(endX) ~=
        "number" or type(endY) ~= "number" or
        (nColour ~= nil and type(nColour) ~= "number") then
        error("Expected startX, startY, endX, endY, colour", 2)
    end

    startX = math.floor(startX)
    startY = math.floor(startY)
    endX = math.floor(endX)
    endY = math.floor(endY)

    if nColour then term.setBackgroundColor(nColour) end
    if startX == endX and startY == endY then
        drawPixelInternal(startX, startY)
        return
    end

    local minX = math.min(startX, endX)
    if minX == startX then
        minY = startY
        maxX = endX
        maxY = endY
    else
        minY = endY
        maxX = startX
        maxY = startY
    end

    for x = minX, maxX do for y = minY, maxY do drawPixelInternal(x, y) end end
end

function  giremu(inputstr, sep)
        local t={}
        for str in string.gmatch(inputstr, "([^"..sep.."]+)") do
                table.insert(t, str)
        end
        return t
end

function clear()
    sfondo(colors.black)
    term.clear()
    term.setCursorPos(1, 1)
end

function clearRed()
    sfondo(colors.red)
    term.clear()
    term.setCursorPos(1, 1)
end

function titolo(testo)
    drawFilledBox(1, 1, maxw, 1, colors.orange)
    term.setCursorPos((maxw - #testo) / 2, 1)
    term.setTextColor(colors.white)
    term.write(testo)
end

function alarm(testo, colore, y)
    drawFilledBox(1, y, maxw, y, colors[colore])
    term.setCursorPos((maxw - #testo) / 2, y)
    term.setTextColor(colors.white)
    term.write(testo)
    no()
end


function ico(x, y, color, text)
   term.setBackgroundColor(colors[color])
   term.setTextColor(colors.white)
   term.setCursorPos(x, y)
   print(text)
   drawA()
end

function drawA()
   term.setBackgroundColor(colors.white)
   term.setTextColor(colors.black)
end

function drawMenu()
   drawA()
   term.clear()
   term.setCursorPos(1, 1)
   titolo("Hack Calculator")
   ico(51, 1, "red", "X")
end
don = 0

while true do
  if don == 0 then
    drawMenu()
    print("\n\nAddizione: + | Sottrazione: -\nMoltiplicazione: x | Divisione: /")
    print("\n")
    num1 = read()
    div = read()
    num2 = read()
    if num1 ~= nil and num1 ~= '' and num2 ~= nil and num2 ~= '' and div ~= nil and div == "+" or div == "-" or div == "x" or div == "/" then
      if div == "+" then
        ris = tonumber(num1) + tonumber(num2)
      elseif div == "-" then
        ris = tonumber(num1) - tonumber(num2)
      elseif div == "x" then
        ris = tonumber(num1) * tonumber(num2)
      elseif div == "/" then
        ris = tonumber(num1) / tonumber(num2)
      else
        ris = "Operazione invalida!"
      end
     else
       ris = "Campi invalidi!"
     end
     term.setCursorPos(15, 9)
     print("=  "..ris)
     ico (15, 16, "green", " ALTRO CALCOLO ")
     local event, bt, x, y = os.pullEvent("mouse_click")
       if y == 1 and x == 51 then
          shell.run("desktop")
       elseif y == 16 then
          don = 0
       end
  end
end