test disegno di un grafico

local history = {}

local function calculateHeight(maxHeight, value, maxValue)
  return math.floor(maxHeight * (value / maxValue) + 0.5)
end

local function drawGraph(history, xPos, yPos, length, height, maxValue)
  local len = #history
  for x = length, 1, -1 do
    local i = length - x + 1
    for y = 1, calculateHeight(height, history[i], maxValue) do
      -- draw a pixel at that position.
      term.setCursorPos(xPos + x,  yPos + y)
      term.write(' ')
    end
  end
end

local function addHistory(value)
  table.insert(history, value)
  if #history > 50 then
    table.remove(history, 1)
  end
end


addHistory(83)
addHistory(29)
addHistory(37)
addHistory(99)
addHistory(75)
addHistory(16)
addHistory(1)
addHistory(5)

drawGraph(history, 3, 15, 9, 12, 100)