Simple keypad

term.clear()
term.setCursorPos(1,1)
screenX, screenY = term.getSize()
code = ""
validOption = false
pass = 22222
abbruch = 33333
startXpos = math.ceil(screenX/2) - 5
startYpos = math.floor(screenY/2)

t_keypad = {
    {text = "1", xPos = startXpos, yPos = startYpos, color = colours.yellow},
    {text = "2", xPos = startXpos + 4, yPos = startYpos, color = colours.yellow},
    {text = "3", xPos = startXpos + 8, yPos = startYpos, color = colours.yellow},
    {text = "4", xPos = startXpos, yPos = startYpos + 2, color = colours.yellow},
    {text = "5", xPos = startXpos + 4, yPos = startYpos + 2, color = colours.yellow},
    {text = "6", xPos = startXpos + 8, yPos = startYpos + 2, color = colours.yellow},
    {text = "7", xPos = startXpos, yPos = startYpos + 4, color = colours.yellow},
    {text = "8", xPos = startXpos + 4, yPos = startYpos + 4, color = colours.yellow},
    {text = "9", xPos = startXpos + 8, yPos = startYpos + 4, color = colours.yellow},
    {text = "0", xPos = startXpos + 4, yPos = startYpos + 6, color = colours.yellow},
    {text = "CLR", xPos = startXpos - 1, yPos = startYpos + 6, color = colours.lightBlue},
    {text = "ENT", xPos = startXpos + 7, yPos = startYpos + 6, color = colours.red}
}

function drawKeyPad()
    term.clear()
    term.setCursorPos(startXpos - 2, startYpos - 4) print("-Zugangscode-")
    term.setCursorPos(startXpos - 2, startYpos - 3) print("-------------")
    term.setCursorPos(startXpos - 2, startYpos - 2) print("|---     ---|")
    term.setCursorPos(startXpos - 2, startYpos - 1) print("-------------\n")
    term.setCursorPos(startXpos - 2, startYpos)     print("|   |   |   |")
    term.setCursorPos(startXpos - 2, startYpos + 1) print("-------------")
    term.setCursorPos(startXpos - 2, startYpos + 2) print("|   |   |   |")
    term.setCursorPos(startXpos - 2, startYpos + 3) print("-------------")
    term.setCursorPos(startXpos - 2, startYpos + 4) print("|   |   |   |")
    term.setCursorPos(startXpos - 2, startYpos + 5) print("-------------")
    term.setCursorPos(startXpos - 2, startYpos + 6) print("|   |   |   |")
    term.setCursorPos(startXpos - 2, startYpos + 7) print("-------------")
    for i = 1, #t_keypad do
        term.setCursorPos(t_keypad[i].xPos, t_keypad[i].yPos)
        if type(t_keypad[i].color) == "number" then term.setTextColour(t_keypad[i].color) else term.setTextColour(colours.black) end
        write(t_keypad[i].text)
    end
end

function checkMouseClick(_xPos, _yPos)
    clicked = ""
    bool = false
    for i = 1, #t_keypad do
        if _xPos >= t_keypad[i].xPos and _xPos <= (t_keypad[i].xPos + (string.len(t_keypad[i].text) - 1)) and
        _yPos == t_keypad[i].yPos then
            text = t_keypad[i].text
            bool = true
            break
        end
    end
    return bool, text
end

drawKeyPad()

while true do
    term.setCursorPos(startXpos + 2, startYpos - 2)
    write("     ")
    term.setCursorPos(startXpos + 2, startYpos - 2)
    write(string.rep("*", #code))
    event, button, x, y = os.pullEvent()
    if event == "mouse_click" then
        validOption, clicked = checkMouseClick(x, y)
        if validOption then
            if tonumber(clicked) and #code < 5 then
                code = code .. clicked
            elseif clicked == "CLR" then
                code = ""
            elseif clicked == "ENT" then
                code = tonumber(code)
                if code == pass then
                    rs.setOutput("bottom",true)
                    sleep(3)
                    rs.setOutput("bottom",false)
                elseif code == abbruch then
                    term.setCursorPos(1, 1)
                    term.clear()
                    term.setTextColour(colours.red)
                    print("Aborted.\n")
                    term.setTextColour(colours.black)
                    break
                else
                    term.setCursorPos(startXpos - 1, startYpos - 2)
                    term.setTextColour(colours.red)
                    write("  Invalid  ")
                    sleep(1.5)
                    term.setTextColour(colours.white)
                    term.setCursorPos(startXpos - 2, startYpos - 2) print("|---     ---|")
                    term.setTextColour(colours.red)
                end
                code = ""
            end
        end
    end
end