[Computercraft] Monitor API

--(C) Corona 2013
--DO NOT STEAL THIS CODE!!!
function drawButton(button,side)
  xStart=button["x1"]
  xEnd=button["x2"]
  yStart=button["y1"]
  yEnd=button["y2"]
  fillColor=button["color"]
  x=xEnd-xStart
  y=yEnd-yStart
  textCentery=(yStart+y/2)
  textCenterx=(xStart+(x/2))-(string.len(button["text"])/2)
  monitor=peripheral.wrap(side)
  monitor.setCursorPos(xStart,yStart)
  if button["color"] ~= nil and term.isColor() then
    monitor.setBackgroundColor(button["color"])
  else
    monitor.setBackgroundColor(colors.white)
  end
  for j=1,y do
    for i=1,x do
        monitor.write(" ")
    end
  monitor.setCursorPos(xStart,yStart+j)
  end
  if button["text"] ~= nil and monitor.isColor() then
    monitor.setCursorPos(textCenterx,textCentery)
    monitor.write(button["text"])
  end
  monitor.setBackgroundColor(colors.black)
end

function drawBox(area,side)
  m = peripheral.wrap(side)
  x1 = area["x1"]
  x2 = area["x2"]
  y1 = area["y1"]
  y2 = area["y2"]
  color = area["color"]
  xSpan = x2-x1
  ySpan = y2-y1
  cornerCount = 1
  m.setCursorPos(x1,y1)
  for j=1,ySpan do
    for i=1,xSpan do
      if (cornerCount == 1) or (cornerCount == ySpan) or (i == 1) or (i == xSpan) then
        m.setBackgroundColor(color)
        m.write(" ")
      else
        local tx,ty = m.getCursorPos()
        m.setCursorPos(tx+1,ty)
      end
    end
    cornerCount = cornerCount+1
    m.setCursorPos(x1,y1+j)
  end
end

function pressed(object,x,y)
  if (object["x1"]<=x) and (object["x2"]>=x) and (object["y1"]<=y) and (object["y2"]>=y) then
    return true
  else
    return false
  end
end

function changeColor(button,color)
  button["color"] = color
  draw(button)
  return button
end

function cls(side)
  local monitor=peripheral.wrap(side)
  monitor.setBackgroundColor(colors.black)
  monitor.clear()
end

function getFocus(area)
  term.setCursorPos(area["x1"]+1,area["y1"]+1)
end