Elevator

books = {"FloorB","Dense","Clickme"}
names = {"BedrockFloor","Dense Ores World","Click Me!"}
xes = {}


function reset()
  term.setBackgroundColor(colors.white)
  term.setTextColor(colors.black)
  term.clear()
end


function cprint(w,y,text)
  term.setCursorPos((w/2)-(#text/2),y)
  term.write(text)
end


function getCenter(w,text,reset)
  if reset == false then
    one = (w/2)-(#text/2)
    two = one+#text
    tbl = {}
    table.insert(tbl,one)
    table.insert(tbl,two)
    table.insert(xes,tbl)
  elseif reset == true then
    xes = {}
  end
end


while true do
  reset()
  term.setBackgroundColor(colors.red)
  term.setCursorPos(1,1)
  size = {term.getSize()} --term has already been redirected.
  for i = 1,size[1] do
    term.write(" ")
  end
  term.setCursorPos(1,size[2])
  for i = 1,size[1] do
    term.write(" ")
  end
  cprint(size[1],1,"EBTele Terminal")
  term.setBackgroundColor(colors.white)
  cprint(size[1],3,"Select a Destination")
  for i = 1,#books do
    term.setBackgroundColor(colors.red)
    cpos = {term.getCursorPos()}
    cprint(size[1],cpos[2]+2," "..names[i].." ")
    getCenter(size[1]," "..names[i].." ",false)
  end


  evnt = {os.pullEvent()}
  if evnt[1] == "mouse_click" then
    for i = 1,#books do
      if evnt[4] == 3+(2*i) then
        if evnt[3] >= xes[i][1] and evnt[3] <= xes[i][2] then
          print(names[i])
              sleep(1)
        end
      end
    end
  end
  getCenter(size[1],"na",true)
end