startup

while true do
 sleep(300)

local mon = peripheral.wrap("monitor_61")
local pylon = peripheral.wrap("draconic_rf_storage_5")
monX, monY = mon.getSize()

function clear()
  mon.setBackgroundColor(colors.black)
  mon.clear()
  mon.setCursorPos(1,6)
end

function drawText(x, y, text, color_txt, color_bg)
  mon.setBackgroundColor(color_bg)
  mon.setTextColor(color_txt)
  mon.setCursorPos(x,y)
  mon.write(text)
end

function drawLine(x, y, length, size, color_bar)
  for yPos = y, y+size-1 do
    mon.setBackgroundColor(color_bar)
    mon.setCursorPos(x, yPos)
    mon.write(string.rep(" ", length))
  end
end

function drawProg(x, y, name, length, size, minVal, maxVal, color_bar, color_bg)
  drawLine(x, y, length, size, color_bg)
  local barSize = math.floor((minVal/maxVal)*length)
  drawLine(x, y, barSize, size, color_bar)
  local text = name.." "..math.floor((minVal/maxVal)*100).."%"
  if barSize > length/2+#text/2 then
    drawText(x+length/2-#text/2, y+size/2, text, colors.black, color_bar)
  elseif barSize > #text then
    drawText((x+barSize)-#text, y+size/2, text, colors.black, color_bar)
  else
    drawText(x+length/2-#text/2, y+size/2, text, colors.black, color_bg)
  end
end

  drawProg(2,8, " ", 27, 3, pylon.getEnergyStored(), pylon.getMaxEnergyStored(), colors.lime, colors.gray)

end