new

mon = peripheral.wrap("left")
core = peripheral.wrap("top")
max = core.getMaxEnergyStored()
monX, monY = mon.getSize()

function clear()
  mon.setBackgroundColor(colors.black)
  mon.clear()
  mon.setCursorPos(1,1)
end
function title()
  mon.setBackgroundColor(colors.black)
  mon.setCursorPos(monX/2-5, 2)
  mon.write("Power Status")
end
function current()
  mon.setBackgroundColor(colors.black)
  mon.setCursorPos(monX/2-6, 6)
  mon.write("Current Stored")
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 > monX/2+#text/2 then
      drawText(monX/2-#text/2, y+size/2, text, colors.black, colors.green)
    elseif barSize > #text then
      drawText((x+barSize)-#text, y+size/2, text, colors.black, colors.green)
    else
      drawText(monX/2-#text/2+2, y+size/2, text, colors.black, colors.gray)
    end
end

clear()
while true do
  stored = core.getEnergyStored()
  title()
  mon.setCursorPos(1,4)
  mon.write("---------------------------------------")
  current()
  drawProg(3, 7, stored , monX-4, 2, stored, max, colors.green, colors.gray)
  sleep(1)

end