curses.rb

require 'curses'

# Innit.
Curses::init_screen

# Don't echo keypress on the console.
Curses::noecho

# Create a centered window, of size:
height, width = 32, 64
win = Curses::Window.new(height, width, (Curses::lines - height) / 2 , (Curses::cols - width) / 2)

# Arguments can specify horizontal and vertical characters used.
# Not sure how to specify which chars to use for corners.
win.box(0,0)

# Make arrow keys match Curses::KEY_UP and friends as expected.
win.keypad = true

# Don't block when calling Window#getch and friends.
win.nodelay = true


# Enable colour.
Curses.start_color

# Curses define the following constant, which are just integers 0-7:
# Curses::COLOR_BLUE     Curses::COLOR_CYAN     Curses::COLOR_GREEN    Curses::COLOR_MAGENTA
# Curses::COLOR_RED      Curses::COLOR_WHITE    Curses::COLOR_YELLOW   Curses::COLOR_BLACK

# You can use 16 colours if your terminal support it.
# e.g. export TERM=xterm-16color

# Pairs of foreground and background colours declared before use.
0.upto(15) do |fg|
  Curses.init_pair(fg+1, fg, Curses::COLOR_BLACK)
end

# Can flip fg and bg.
win.attron(Curses::A_REVERSE)
#win.attroff(Curses::A_REVERSE)

begin
  100.times do
    # Random point.
    x, y = rand(31), rand(30)
    # Random colour pair.
    win.attron(Curses.color_pair(rand(16)+1))
    win.setpos(y+1, (x*2)+1)
    # Add a single char.
    #win.addch(32)
    win.addstr("  ")
  end
  # Hide cursor.
  Curses.curs_set(0)
  win.refresh
  sleep 0.1
end while win.getch != ?q

# Clean up.
win.close
Curses::close_screen