Sonar Gorae

local function doSonarSweep()
    rs.setOutput("back", true)
    sleep(0.5)
    rs.setOutput("back", false)
end

local sonColors = {1024, 2048, 512, 8192, 32, 2, 16, 16384}

local function clearScreen()
    term.setBackgroundColor(32768)
    term.clear()
    term.setCursorPos(1,1)
    term.setTextColor(1)

term.setCursorPos(1, 1)
term.write("       Sulyeog eumhyang danji «Arktika»")
term.setCursorPos(25, 2)
term.write("-O-")

term.setCursorPos(50, 3)
term.write("0")
term.setCursorPos(50, 6)
term.write(".5")
term.setCursorPos(50, 9)
term.write("1k")
term.setCursorPos(50, 12)
term.write("2k")
term.setCursorPos(50, 15)
term.write("4k")
term.setCursorPos(50, 18)
term.write("8k")

term.setCursorPos(1, 3)
term.write("0")
term.setCursorPos(1, 6)
term.write(".5")
term.setCursorPos(1, 9)
term.write("1k")
term.setCursorPos(1, 12)
term.write("2k")
term.setCursorPos(1, 15)
term.write("4k")
term.setCursorPos(1, 18)
term.write("8k")
end

local function drawLine(y, modifier)
    for i = 4, 48 do
        local ran = math.floor(math.random(1, 2))
        local m1 = math.floor(math.random(1, 3))
        local m2 = math.floor(math.random(1, 3))
        local m3 = math.floor(math.random(1, 2))
        if i > 30+m2 then
            ran = ran
        elseif i > 20-m1 then
            ran = ran + 1 + modifier
--        elseif i < 20 then
--            ran = ran
        end
        ran = ran + modifier
        if (ran+1) > 8 then
            ran = 9 - (math.floor(math.random(1,2)))
        end
        local colorBase = sonColors[ran]
        paintutils.drawPixel(i, y, colorBase)

   end
end

clearScreen()



term.setCursorPos(21, 10)
term.setBackgroundColor(colors.red)
term.setTextColor(colors.white)
term.write("SIYAG")


event = os.pullEvent("mouse_click")

clearScreen()
doSonarSweep()

while true do
    for i = 3, 21 do
        mod = 8 - i
        if mod < 0 then
          mod = 0
        end
        drawLine(i, mod)
        sleep(0.1)
    end
    doSonarSweep()
end