corners2.rb

require 'ncurses'

begin
  window = Ncurses.initscr
  Ncurses.cbreak
  
  lines, cols = [], []
  window.getmaxyx(lines, cols)
  rows = lines.first - 1
  cols = cols.first - 1
  
  window.mvaddch 0, 0, '*'[0]
  window.refresh
  Ncurses.napms(500)

  window.mvaddch 0, cols, '*'[0]
  window.refresh
  Ncurses.napms(500)

  window.mvaddch rows, 0, '*'[0]
  window.refresh
  Ncurses.napms(500)

  window.mvaddch rows, cols, '*'[0]
  window.refresh
  Ncurses.napms(500)
  
  window.move rows/2, cols/2
  window.refresh

  window.getch
ensure
  Ncurses.endwin
end