Blazefarm monitor

m = peripheral.wrap("top")
w,h = m.getSize()
w = w+1
h = h+1
col = { ["white"]=1, ["orange"]=2, ["magenta"]=4, ["lightblue"]=8, ["yellow"]=16, ["lime"]=32, ["pink"]=64, ["gray"]=128, ["lightgray"]=256, ["cyan"]=512, ["purple"]=1024, ["blue"]=2048, ["brown"]=4096, ["green"]=8192, ["red"]=16384, ["black"]=32768 }
dispenser = false
extractor = false
os.startTimer(1)
cart = 0
rednet.open("right")
rednet.broadcast("dispoff")

function swrite(str,x,y,color)
	m.setCursorPos(x,y)
	m.setTextColor(col[color])
	m.write(str)
end

function drawbox(str,x1,x2,y1,y2,strcol,color)
	m.setCursorPos(x1,y1)
	m.setBackgroundColor(col[color])
	m.setTextColor(col[strcol])
	local bw = x2-x1
	local bh = y2-y1
	local bstr = " "
	while #bstr < bw do
		bstr = bstr.." "
	end
	for i=1,bh do
		m.setCursorPos(x1,y1+i-1)
		m.write(bstr)
	end
	m.setCursorPos(x1+bw/2-#str/2,y1+bh/2)
	m.write(str)
	m.setBackgroundColor(col["black"])
	return { [1]=x1, [2]=x2, [3]=y1, [4]=y2 }
end

function press(but)
	if event == "monitor_touch" then
		if pr2 >= but[1] and pr2 < but[2] and pr3 >= but[3] and pr3 < but[4] then
			return true
		else
			return false
		end
	end
end

function drawbackground(str,strcol,color)
	drawbox("",1,w,1,h,strcol,color)
	drawbox("",2,w-1,2,h-1,"black","black")
	drawbox(str,1,w,1,2,strcol,color)
end

function drawmenu()
	if active then
		button = drawbox("Stop",4,w-3,5,8,"black","green")
		rednet.broadcast("blazefarmon")
	else
		button = drawbox("Start",4,w-3,5,8,"black","red")
		rednet.broadcast("blazefarmoff")
	end
end

drawbackground("Blaze XP Farm","black","white")
drawmenu()

while true do
	event,pr1,pr2,pr3 = os.pullEvent()
	if press(button) then
		active = not active
		drawmenu()
	end
end