Air hockey

local monitor = peripheral.find("monitor")
local width1,width2 = 5,5
local x1,x2=13,12
local bx,by,sx,sy = 15,17,2,1
-- Score
local p1,p2 = 0,0
--Resolution x=29 y=33

function Movement()

    if (x2<1) then x2=1 end
    if (x2>29-width2) then x2=29-width2 end

    -- Ball movement
    bx=bx+sx
    by=by+sy

    -- Wall collision
    if (bx<1) then
        sx=(sx*-1)
        bx = 2
    elseif (bx>29) then
        sx=(sx*-1)
        bx = 28
    end

    -- Score?
    if (by<=1)then
        bx,by = 15,17
        p2=p2+1
        sy=sy*-1
    elseif (by>=33) then
        bx,by = 15,17
        p1=p1+1
        sy=sy*-1
    end

    -- Player 1 collision
    if (bx>=x1 and bx<=x1+width1 and by<=3)then
        sy=(sy*-1) -- + math.random(-2,2)
        bx = bx + math.random(-1,1)
    end

    -- Player 2 collision
    if (bx>=x2 and bx<=x2+width2 and by>=31)then
        sy=(sy*-1) -- + math.random(-2,2)
        bx = bx + math.random(-1,1)
    end
end

function Paint()
    term.setBackgroundColor(colors.white)
    term.clear()

    -- Score
    term.setTextColor(colors.black)
    term.setCursorPos(13,20)
    term.write(tostring(p1) .. " - " .. tostring(p2))

    -- Middle bar
    paintutils.drawLine(1,17,12,17,colors.lightGray)
    paintutils.drawBox(13,15,17,19,colors.lightGray)
    paintutils.drawLine(18,17,29,17,colors.lightGray)

    -- Areas
    paintutils.drawBox(6,0,24,5,colors.lightGray)
    paintutils.drawBox(6,34,24,29,colors.lightGray)

    -- Player1 bar
    paintutils.drawLine(x1,2,x1+width1,2,colors.blue)

    -- Player2 bar
    paintutils.drawLine(x2,32,x2+width2,32,colors.red)

    -- Ball
    paintutils.drawPixel(bx,by,colors.green)
end

-- Main --
term.redirect(monitor)
while(true) do
    sx, sy = 2,1
    Paint()
    term.setBackgroundColor(colors.white)
    term.setTextColor(colors.yellow)
    term.setCursorPos(10,22)
    term.write("INSERT COIN")
    if (redstone.getAnalogInput("bottom") > 0) then
        local loop = true
        while(loop) do
            parallel.waitForAny(function()
                local event, button, x, y = os.pullEvent("monitor_touch")
                if (y > 16) then
                    x2 = x-2
                else
                    x1 = x-2
                end
            end,
            function()
                Movement()
                Paint()
                sleep(0.2)
                if(p1>10 or p2>10) then
                    loop=false
                    p1,p2 = 0,0
                end
            end)
        end
    end
    sleep(0.1)
end