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#!/usr/bin/env python
#
# snake.py
# Playing with ctypes and libcaca
# http://mornie.org/blog/2007/03/25/Playng-with-ctypes-and-libcaca/
#
# Copyright (C) 2007 Daniele Tricoli aka Eriol <eriol@mornie.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# -- Changelog
# * 23/03/07
# Initial release
# * 20/10/07
# Applied patch by Sam Hocevar: check for caca_get_event's return value
# and added caca_event's missing first member
# * 25/10/07
# Updated for newer libcaca API (Sam Hocevar)
import ctypes as C
import random
import sys
import time
CANVAS_WIDTH = 80
CANVAS_HEIGHT = 40
CENTER_X = CANVAS_WIDTH / 2
CENTER_Y = CANVAS_HEIGHT / 2
UP = 273
DOWN = 274
LEFT = 275
RIGHT = 276
class ev(C.Structure):
_fields_ = [('opaque_structure', C.c_char_p * 32)]
class Snake(object):
def __init__(self, center_point, length):
self.head = center_point
self.body = []
for y in xrange(self.head[1] + 1, self.head[1] + length + 1):
self.body.append((self.head[0], y))
def move(self, direction):
phead = tuple(self.head)
if direction == 'UP':
self.head[1] -=1
elif direction == 'DOWN':
self.head[1] +=1
elif direction == 'LEFT':
self.head[0] -=1
elif direction == 'RIGHT':
self.head[0] +=1
self.body = [phead] + self.body[:-1]
def grow(self):
self.body += [tuple(self.head)] * 2
def draw(self):
global cv
lcaca.cucul_set_color_ansi(cv, 0x05, 0x00)
for p in self.body:
lcaca.cucul_put_char(cv, p[0], p[1], ord('o'))
lcaca.cucul_set_color_ansi(cv, 0x02, 0x00)
lcaca.cucul_put_char(cv, self.head[0], self.head[1], ord('@'))
lcaca.caca_refresh_display(dp)
class Target(object):
def __init__(self):
self.total = 0
def random(self, width, height):
self.x = int(random.uniform(1, width))
self.y = int(random.uniform(1, height))
self.value = random.choice(range(1,10))
def sum(self):
self.total += self.value
def draw(self):
global cv
lcaca.cucul_set_color_ansi(cv, 0x03, 0x00)
lcaca.cucul_put_char(cv, self.x, self.y, ord(str(self.value)))
lcaca.caca_refresh_display(dp)
def draw_border():
lcaca.cucul_set_color_ansi(cv, 0x04, 0x00)
lcaca.cucul_draw_box(cv,
0,
0,
CANVAS_WIDTH - 1,
CANVAS_HEIGHT - 1,
ord('#'))
event = ev()
lcaca = C.cdll.LoadLibrary('libcaca.so.0')
cv = lcaca.cucul_create_canvas(CANVAS_WIDTH, CANVAS_HEIGHT)
dp = lcaca.caca_create_display(cv)
lcaca.caca_set_display_title(dp, "snake.py - playing with ctypes and libcaca")
s = Snake([CENTER_X, CENTER_Y], 5)
t = Target()
t.random(CANVAS_WIDTH - 2, CANVAS_HEIGHT - 2)
draw_border()
s.draw()
t.draw()
lcaca.caca_get_event(dp, 0x0001, C.byref(event), -1)
while True:
while lcaca.caca_get_event(dp, 0x0001, C.byref(event), 0):
ch = lcaca.caca_get_event_key_ch(C.byref(event))
if ch == 113: # 'q' pressed
sys.exit()
elif ch == UP:
d = 'UP'
elif ch == DOWN:
d = 'DOWN'
elif ch == LEFT:
d = 'LEFT'
elif ch == RIGHT:
d = 'RIGHT'
try:
s.move(d)
except NameError:
pass
if (tuple(s.head) in s.body[1:] or
not 0 < s.head[0] < CANVAS_WIDTH - 1 or
not 0 < s.head[1] < CANVAS_HEIGHT - 1):
print 'Game Over!'
print 'Total score:', t.total
sys.exit()
elif tuple(s.head) == (t.x, t.y):
t.sum()
t.random(CANVAS_WIDTH - 2, CANVAS_HEIGHT - 2)
s.grow()
lcaca.cucul_clear_canvas(cv)
draw_border()
s.draw()
t.draw()
time.sleep(0.1)
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