startup.lua

--- Variables
local mfsu1 = peripheral.wrap("ic2:mfsu_1")
local mfsu2 = peripheral.wrap("ic2:mfsu_2")
local mon = peripheral.wrap("top")
local rx,ry = mon.getSize()

-- text
local headLine = "EU Power Storage"

-- colors
local bc = colors.black
local tc = colors.white
local bar = colors.lime
local barOff = colors.gray

--- Functions
function drawIntro()
 mon.setBackgroundColor(bc)
 mon.setTextColor(tc)
 mon.clear()
 mon.setBackgroundColor(colors.gray)
 mon.setCursorPos(1, 1)
 mon.clearLine()
 mon.setCursorPos(math.floor((rx/2)-(string.len(headLine))/2)+1, 1)
 mon.write(headLine)
end

function drawBar(x, y, text, name)
 mon.setBackgroundColor(bc)
 mon.setTextColor(tc)
 if(name=="mfsu1") then
  ene = mfsu1.getEUStored()
  cap = mfsu1.getEUCapacity()
 elseif(name=="mfsu2") then
  ene = mfsu2.getEUStored()
  cap = mfsu2.getEUCapacity()
 end
 local per = math.ceil((ene/cap)*100)
 local pro = math.ceil(((rx-1)/100)*per)

 mon.setCursorPos(x, y)
 mon.write(text.." - "..ene.." / "..cap)

 if(per<15) then
  mon.setBackgroundColor(colors.red)
 elseif(per>15 and per<30) then
  mon.setBackgroundColor(colors.orange)
 else
  mon.setBackgroundColor(bar)
 end

 for i = x, pro do
  mon.setCursorPos(i, y+1)
  mon.write(" ")
  mon.setCursorPos(i, y+2)
  mon.write(" ")
  mon.setCursorPos(i, y+3)
  mon.write(" ")
 end

 mon.setBackgroundColor(barOff)

 for i = pro, rx-1 do
  if(i<x) then
   i=x
  end
  mon.setCursorPos(i, y+1)
  mon.write(" ")
  mon.setCursorPos(i, y+2)
  mon.write(" ")
  mon.setCursorPos(i, y+3)
  mon.write(" ")
 end

end

function draw()
 drawBar(2, 3, "MFSU 1", "mfsu1")
 drawBar(2, 8, "MFSU 2", "mfsu2")
end

--- Execute
function init()
 drawIntro()
 while true do
  draw()
  sleep(0.5)
 end
end

init()