invaders

local m = peripheral.find("monitor")
local cBlack = colors.black
local cWhite = colors.white

local s = ""

function setCharMode(_isWhiteOnBlack)
    if _isWhiteOnBlack then
        m.setTextColor(cWhite)
        m.setBackgroundColor(cBlack)
    else
        m.setTextColor(cBlack)
        m.setBackgroundColor(cWhite)
    end
end

function drawSpaceship(_x, _y)
    setCharMode(true)
    m.setCursorPos(_x, _y)
    m.write(string.char(158))

    setCharMode(false)
    m.setCursorPos(_x+1, _y)
    m.write(string.char(146))

    setCharMode(true)
end

function drawAlien(_x, _y)
    setCharMode(true)
    m.setCursorPos(_x, _y)
    m.write(string.char(155))
    setCharMode(false)
    m.setCursorPos(_x+1, _y)
    m.write(string.char(152))

    setCharMode(true)
end

m.clear()

drawSpaceship(13, 11)

for i=0, 5 do
    for j=0, 1 do
        drawAlien(2 + i*4, 2 + j*3)
    end
end