temp

barGraph = peripheral.wrap("top")
x,y = barGraph.getSize()

function drawGraph(percentValue)
      for j = y,1,-1 do
         barGraph.setCursorPos(1,j)
         if ( y-j ) * ( y/100 ) <= percentValue then
            barGraph.setBackgroundColour(colors.green)
         else
            barGraph.setBackgroundColour(colors.black)
         end
         barGraph.write(string.rep(" ",x))
      end
end

for i = 1,100 do
   drawGraph(i)
   sleep(2)
end