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Filename : pingpong.stp

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#!/usr/bin/stap
# Ping pong ball in tty window
# Run in a xterm and resize window
# Copyright (C) 2011 Masami Hiramatsu <masami.hiramatsu@gmail.com>
#
# This file is free software and is distributed under the terms of the GNU
# General Public License (GPL); either version 2, or (at your option) any
# later version.

global Row, Col
global dr = 1, dc = 1

probe begin {
	Row = game_tty_ws_row()/2; Col = game_tty_ws_col()/2
}

probe timer.ms(50) {
	Row += dr; Col += dc
	if (Row >= game_tty_ws_row()) {
		dr = -dr; Row = game_tty_ws_row()
	} else if (Row <= 1) {
		dr = -dr; Row = 1
	}
	if (Col >= game_tty_ws_col()) {
		dc = -dc; Col = game_tty_ws_col()
	} else if (Col <= 1) {
		dc = -dc; Col = 1
	}
	ansi_clear_screen()
	ansi_cursor_move(Col, Row)
	print("@")
}