PyGobject（一百零二）Cairo系列——贪吃蛇游戏

例子

代码：

#!/usr/bin/env python3# Created by xiaosanyu at 16/7/6# section 152TITLE = "Snake game"DESCRIPTION = """Snake is an older classic video game. It was first created in late 70s.Later it was brought to PCs. In this game the player controls a snake.The objective is to eat as many apples as possible.Each time the snake eats an apple, its body grows.The snake must avoid the walls and its own body.This game is sometimes called Nibbles."""import gigi.require_version("Gtk", "3.0")from gi.repository import Gtk, Gdk, GLibimport cairoimport sysimport randomimport osFONT_SIZE = 14WIDTH = 300HEIGHT = 270DOT_SIZE = 10ALL_DOTS = int(WIDTH * HEIGHT / (DOT_SIZE * DOT_SIZE))RAND_POS = 26DELAY = 200x = [0] * ALL_DOTSy = [0] * ALL_DOTSclass Board(Gtk.DrawingArea):    def __init__(self):        super(Board, self).__init__()        self.modify_bg(Gtk.StateFlags.NORMAL, Gdk.Color(0, 0, 0))        self.set_size_request(WIDTH, HEIGHT)        self.connect("draw", self.draw)        self.init_game()    def on_timer(self):        if self.inGame:            self.check_apple()            self.check_collision()            self.move()            self.queue_draw()            return True        else:            return False    def init_game(self):        self.left = False        self.right = True        self.up = False        self.down = False        self.inGame = True        self.dots = 3        for i in range(self.dots):            x[i] = 50 - i * 10            y[i] = 50        try:            self.dot = cairo.ImageSurface.create_from_png(os.path.join(os.path.dirname(__file__), "../data/dot.png"))            self.head = cairo.ImageSurface.create_from_png(os.path.join(os.path.dirname(__file__), "../data/head.png"))            self.apple = cairo.ImageSurface.create_from_png(                    os.path.join(os.path.dirname(__file__), "../data/apple.png"))        except Exception as e:            print(e)            sys.exit(1)        self.locate_apple()        self.start_game()    def start_game(self):        GLib.timeout_add(DELAY, self.on_timer)    def draw(self, widget, cr):        if self.inGame:            cr.set_source_rgb(0.6, 0.6, 0.6)            cr.paint()            cr.set_source_surface(self.apple, self.apple_x, self.apple_y)            cr.paint()            for z in range(self.dots):                if z == 0:                    cr.set_source_surface(self.head, x[z], y[z])                    cr.paint()                else:                    cr.set_source_surface(self.dot, x[z], y[z])                    cr.paint()        else:            self.game_over(widget, cr)    def game_over(self, widget, cr):        w = widget.get_allocated_width()        h = widget.get_allocated_height()        (x, y, width, height, dx, dy) = cr.text_extents("Game Over")        cr.set_source_rgb(65535, 0, 0)        cr.set_font_size(FONT_SIZE)        cr.move_to((w - width) / 2, h / 2)        cr.show_text("Game Over")        self.inGame = False    def check_apple(self):        if x[0] == self.apple_x and y[0] == self.apple_y:            self.dots += 1            self.locate_apple()    def move(self):        z = self.dots        while z > 0:            x[z] = x[(z - 1)]            y[z] = y[(z - 1)]            z -= 1        if self.left:            x[0] -= DOT_SIZE        if self.right:            x[0] += DOT_SIZE        if self.up:            y[0] -= DOT_SIZE        if self.down:            y[0] += DOT_SIZE    def check_collision(self):        z = self.dots        while z > 0:            if z > 4 and x[0] == x[z] and y[0] == y[z]:                self.inGame = False            z -= 1        if y[0] > HEIGHT - DOT_SIZE:            self.inGame = False        if y[0] < 0:            self.inGame = False        if x[0] > WIDTH - DOT_SIZE:            self.inGame = False        if x[0] < 0:            self.inGame = False    def locate_apple(self):        r = random.randint(0, RAND_POS)        self.apple_x = r * DOT_SIZE        r = random.randint(0, RAND_POS)        self.apple_y = r * DOT_SIZE    def on_key_down(self, event):        key = event.keyval        if key == Gdk.KEY_Left and not self.right:            self.left = True            self.up = False            self.down = False        if key == Gdk.KEY_Right and not self.left:            self.right = True            self.up = False            self.down = False        if key == Gdk.KEY_Up and not self.down:            self.up = True            self.right = False            self.left = False        if key == Gdk.KEY_Down and not self.up:            self.down = True            self.right = False            self.left = False        if key == Gdk.KEY_space:            if self.inGame:                self.inGame = False            else:                self.inGame = True                self.start_game()class Snake(Gtk.Window):    def __init__(self):        super(Snake, self).__init__()        self.set_title('Snake')        self.set_size_request(WIDTH, HEIGHT)        self.set_resizable(False)        self.move((Gdk.Screen.width() - WIDTH) / 2, (Gdk.Screen.height() - HEIGHT) / 2)        self.board = Board()        self.connect("key-press-event", self.on_key_down)        self.add(self.board)        self.connect("destroy", Gtk.main_quit)        self.show_all()    def on_key_down(self, widget, event):        key = event.keyval        self.board.on_key_down(event)def main():    Snake()    Gtk.main()if __name__ == "__main__":    main()

代码下载地址：http://download.csdn.net/detail/a87b01c14/9594728