GUI API for the OS

local version = "1.4.2"
local textColor = colors.white

local resetCurs = function()
  term.setCursorPos(1, 1)
end

local set = function()
  term.setTextColor(textColor)
end

--Returns version of API
getVersion = function()
  return version
end

getTextColor = function()
  return textColor
end

setTextColor = function(textcolor)
  textColor = textcolor
end

--Gets the string length and subtracts it to get
--cursor position for text to be centered
centeredText = function( y, str )
  set()
  local w, h = term.getSize()
  term.setCursorPos( math.floor( w - #str) / 2, y )
  term.write( str )
  --resetCurs()
end


--Gets color and cords to draw a rectangle
coloredBox = function( color, sx, sy, ex, ey )
  set()
  term.setBackgroundColor(color)
  for i = sx, ex do
    for k = sy, ey do
      term.setCursorPos( i, k )
      term.write(" ")
    end
  end
  resetCurs()
end

--Line on the X axes
coloredHorzLine = function( color, sx, ex, y)
  set()
  term.setBackgroundColor(color)
  for i = sx, ex do
    term.setCursorPos( i, y)
    term.write(" ")
  end
  resetCurs()
end

--Sets a colored rectangle in the full terminal
setBackground = function( color )
  local w, h = term.getSize()
  coloredBox(color, 1, 1, w, h)
  resetCurs()
end

--Draws with a background color
drawString = function( str, color, x, y )
  set()
  term.setTextColor(colors.white)
  term.setBackgroundColor(color)
  term.setCursorPos(x, y)
  term.write(str)
  resetCurs()
end

--Given bounds and ran in a statement then it will return
getClickInBounds = function( sx, sy, ex, ey )
  set()
  event, button, x, y = os.pullEvent("mouse_click")
  if x <= ex and x >= sx and y <= ey and y >= sy then
    return true
  else
    return false
  end
end