我正在尝试制作 Snake 游戏。我拥有大部分功能（蛇头、网格移动、吃东西）。我遇到的问题是让蛇在吃了一块食物后长大。我已经让蛇的头部更正了它到网格中心的路径，但我想创建一个跟随头部（蛇的身体）的新精灵。
我正在考虑创建一个身体对象，然后对该对象进行延迟，以便在玩家按下箭头键后需要一些时间来转动。这样它就可以模拟蛇身后的身体。这是我所拥有的（带有一些测试代码）：
#Snake07
#Snake grows after eating food
import random
from livewires import games
games.init(screen_width = 530, screen_height = 530, fps = 50)
squares = [(17, 17), (17, 50), (17, 83), (17, 116), (17, 149), (17, 182), (17, 215), (17, 248),
(17, 281), (17, 314), (17, 347), (17, 380), (17, 413), (17, 446), (17, 479), (17, 512),
(50, 17), (50, 50), (50, 83), (50, 116), (50, 149), (50, 182), (50, 215), (50, 248),
(50, 281), (50, 314), (50, 347), (50, 380), (50, 413), (50, 446), (50, 479), (50, 512),
(83, 17), (83, 50), (83, 83), (83, 116), (83, 149), (83, 182), (83, 215), (83, 248),
(83, 281), (83, 314), (83, 347), (83, 380), (83, 413), (83, 446), (83, 479), (83, 512),
(116, 17), (116, 50), (116, 83), (116, 116), (116, 149), (116, 182), (116, 215), (116, 248),
(116, 281), (116, 314), (116, 347), (116, 380), (116, 413), (116, 446), (116, 479), (116, 512),
(149, 17), (149, 50), (149, 83), (149, 116), (149, 149), (149, 182), (149, 215), (149, 248),
(149, 281), (149, 314), (149, 347), (149, 380), (149, 413), (149, 446), (149, 479), (149, 512),
(182, 17), (182, 50), (182, 83), (182, 116), (182, 149), (182, 182), (182, 215), (182, 248),
(182, 281), (182, 314), (182, 347), (182, 380), (182, 413), (182, 446), (182, 479), (182, 512),
(215, 17), (215, 50), (215, 83), (215, 116), (215, 149), (215, 182), (215, 215), (215, 248),
(215, 281), (215, 314), (215, 347), (215, 380), (215, 413), (215, 446), (215, 479), (215, 512),
(248, 17), (248, 50), (248, 83), (248, 116), (248, 149), (248, 182), (248, 215), (248, 248),
(248, 281), (248, 314), (248, 347), (248, 380), (248, 413), (248, 446), (248, 479), (248, 512),
(281, 17), (281, 50), (281, 83), (281, 116), (281, 149), (281, 182), (281, 215), (281, 248),
(281, 281), (281, 314), (281, 347), (281, 380), (281, 413), (281, 446), (281, 479), (281, 512),
(314, 17), (314, 50), (314, 83), (314, 116), (314, 149), (314, 182), (314, 215), (314, 248),
(314, 281), (314, 314), (314, 347), (314, 380), (314, 413), (314, 446), (314, 479), (314, 512),
(347, 17), (347, 50), (347, 83), (347, 116), (347, 149), (347, 182), (347, 215), (347, 248),
(347, 281), (347, 314), (347, 347), (347, 380), (347, 413), (347, 446), (347, 479), (347, 512),
(380, 17), (380, 50), (380, 83), (380, 116), (380, 149), (380, 182), (380, 215), (380, 248),
(380, 281), (380, 314), (380, 347), (380, 380), (380, 413), (380, 446), (380, 479), (380, 512),
(413, 17), (413, 50), (413, 83), (413, 116), (413, 149), (413, 182), (413, 215), (413, 248),
(413, 281), (413, 314), (413, 347), (413, 380), (413, 413), (413, 446), (413, 479), (413, 512),
(446, 17), (446, 50), (446, 83), (446, 116), (446, 149), (446, 182), (446, 215), (446, 248),
(446, 281), (446, 314), (446, 347), (446, 380), (446, 413), (446, 446), (446, 479), (446, 512),
(479, 17), (479, 50), (479, 83), (479, 116), (479, 149), (479, 182), (479, 215), (479, 248),
(479, 281), (479, 314), (479, 347), (479, 380), (479, 413), (479, 446), (479, 479), (479, 512),
(512, 17), (512, 50), (512, 83), (512, 116), (512, 149), (512, 182), (512, 215), (512, 248),
(512, 281), (512, 314), (512, 347), (512, 380), (512, 413), (512, 446), (512, 479), (512, 512)]
class Snake(games.Sprite):
""" The snake. """
image = games.load_image("snake_sprite.png")
snake_length = 0
def update(self):
""" Move up, down, left, and right. """
#move up/down/left/right with arrow keys
if games.keyboard.is_pressed(games.K_UP) or games.keyboard.is_pressed(games.K_DOWN):
if games.keyboard.is_pressed(games.K_UP):
self.dy = -2
self.dx = 0
if games.keyboard.is_pressed(games.K_DOWN):
self.dy = 2
self.dx = 0
if self.x > 0 and self.x < 35:
self.x = 17
if self.x > 34 and self.x < 68:
self.x = 50
if self.x > 67 and self.x < 101:
self.x = 83
if self.x > 100 and self.x < 134:
self.x = 116
if self.x > 133 and self.x < 167:
self.x = 149
if self.x > 166 and self.x < 200:
self.x = 182
if self.x > 199 and self.x < 233:
self.x = 215
if self.x > 232 and self.x < 266:
self.x = 248
if self.x > 265 and self.x < 299:
self.x = 281
if self.x > 298 and self.x < 332:
self.x = 314
if self.x > 331 and self.x < 365:
self.x = 347
if self.x > 364 and self.x < 397:
self.x = 380
if self.x > 397 and self.x < 431:
self.x = 413
if self.x > 430 and self.x < 464:
self.x = 446
if self.x > 463 and self.x < 497:
self.x = 479
if self.x > 496 and self.x < 530:
self.x = 512
if games.keyboard.is_pressed(games.K_LEFT) or games.keyboard.is_pressed(games.K_RIGHT):
if games.keyboard.is_pressed(games.K_LEFT):
self.dx = -2
self.dy = 0
if games.keyboard.is_pressed(games.K_RIGHT):
self.dx = 2
self.dy = 0
if self.y > 0 and self.y < 35:
self.y = 17
if self.y > 34 and self.y < 68:
self.y = 50
if self.y > 67 and self.y < 101:
self.y = 83
if self.y > 100 and self.y < 134:
self.y = 116
if self.y > 133 and self.y < 167:
self.y = 149
if self.y > 166 and self.y < 200:
self.y = 182
if self.y > 199 and self.y < 233:
self.y = 215
if self.y > 232 and self.y < 266:
self.y = 248
if self.y > 265 and self.y < 299:
self.y = 281
if self.y > 298 and self.y < 332:
self.y = 314
if self.y > 331 and self.y < 365:
self.y = 347
if self.y > 364 and self.y < 397:
self.y = 380
if self.y > 397 and self.y < 431:
self.y = 413
if self.y > 430 and self.y < 464:
self.y = 446
if self.y > 463 and self.y < 497:
self.y = 479
if self.y > 496 and self.y < 530:
self.y = 512
#collision with wall
if self.bottom > games.screen.height or self.top < 0 or self.right > games.screen.width or self.left < 0:
self.die()
if self.overlapping_sprites:
Snake.snake_length += 1
def die(self):
self.destroy()
class Food(games.Sprite):
""" Food that the snake eats. """
image = games.load_image("food_sprite.png")
def __init__(self, x, y):
""" Create food. """
super(Food, self).__init__(
image = Food.image,
x = x, y = y)
def update(self):
"""Check for overlap. """
if self.overlapping_sprites:
self.die()
def die(self):
"""Destroy food. """
food_space = random.choice(squares)
x = food_space[0]
y = food_space[1]
new_food = Food(x = x,
y = y)
games.screen.add(new_food)
#snake_length += 1
self.destroy()
class Body(games.Sprite):
""" The body dots of the snake. """
def __init__(self, delay):
self.delay = delay
def update(self):
if self.delay > 0:
self.delay -= 1
if games.keyboard.is_pressed(games.K_UP) or games.keyboard.is_pressed(games.K_DOWN):
if games.keyboard.is_pressed(games.K_UP) and self.delay == 0:
self.dy = -2
self.dx = 0
if games.keyboard.is_pressed(games.K_DOWN) and self.delay == 0:
self.dy = 2
self.dx = 0
if self.x > 0 and self.x < 35:
self.x = 17
if self.x > 34 and self.x < 68:
self.x = 50
if self.x > 67 and self.x < 101:
self.x = 83
if self.x > 100 and self.x < 134:
self.x = 116
if self.x > 133 and self.x < 167:
self.x = 149
if self.x > 166 and self.x < 200:
self.x = 182
if self.x > 199 and self.x < 233:
self.x = 215
if self.x > 232 and self.x < 266:
self.x = 248
if self.x > 265 and self.x < 299:
self.x = 281
if self.x > 298 and self.x < 332:
self.x = 314
if self.x > 331 and self.x < 365:
self.x = 347
if self.x > 364 and self.x < 397:
self.x = 380
if self.x > 397 and self.x < 431:
self.x = 413
if self.x > 430 and self.x < 464:
self.x = 446
if self.x > 463 and self.x < 497:
self.x = 479
if self.x > 496 and self.x < 530:
self.x = 512
if games.keyboard.is_pressed(games.K_LEFT) or games.keyboard.is_pressed(games.K_RIGHT):
if games.keyboard.is_pressed(games.K_LEFT) and self.delay == 0:
self.dx = -2
self.dy = 0
if games.keyboard.is_pressed(games.K_RIGHT) and self.delay == 0:
self.dx = 2
self.dy = 0
if self.y > 0 and self.y < 35:
self.y = 17
if self.y > 34 and self.y < 68:
self.y = 50
if self.y > 67 and self.y < 101:
self.y = 83
if self.y > 100 and self.y < 134:
self.y = 116
if self.y > 133 and self.y < 167:
self.y = 149
if self.y > 166 and self.y < 200:
self.y = 182
if self.y > 199 and self.y < 233:
self.y = 215
if self.y > 232 and self.y < 266:
self.y = 248
if self.y > 265 and self.y < 299:
self.y = 281
if self.y > 298 and self.y < 332:
self.y = 314
if self.y > 331 and self.y < 365:
self.y = 347
if self.y > 364 and self.y < 397:
self.y = 380
if self.y > 397 and self.y < 431:
self.y = 413
if self.y > 430 and self.y < 464:
self.y = 446
if self.y > 463 and self.y < 497:
self.y = 479
if self.y > 496 and self.y < 530:
self.y = 512
def main():
#background
grid_image = games.load_image("grid.png")
games.screen.background = grid_image
#create snake
snake_length = 0
snake = Snake(image = Snake.image,
x = games.screen.width/2,
y = games.screen.height/2)
games.screen.add(snake)
#create food
food_space = random.choice(squares)
x = food_space[0]
y = food_space[1]
new_food = Food(x = x,
y = y)
games.screen.add(new_food)
#create body parts
delay = 25
if Snake.snake_length == 1:
body1 = Body(delay)
games.screen.add(body1)
#body2 = Body(delay *2)
games.screen.mainloop()
main()
这是 Snake06 （在此之前的一代）的代码，它按照我想要的方式工作，只是没有蛇生长：
#Snake06
#Food respawns after eaten
import random
from livewires import games
games.init(screen_width = 530, screen_height = 530, fps = 50)
squares = [(17, 17), (17, 50), (17, 83), (17, 116), (17, 149), (17, 182), (17, 215), (17, 248),
(17, 281), (17, 314), (17, 347), (17, 380), (17, 413), (17, 446), (17, 479), (17, 512),
(50, 17), (50, 50), (50, 83), (50, 116), (50, 149), (50, 182), (50, 215), (50, 248),
(50, 281), (50, 314), (50, 347), (50, 380), (50, 413), (50, 446), (50, 479), (50, 512),
(83, 17), (83, 50), (83, 83), (83, 116), (83, 149), (83, 182), (83, 215), (83, 248),
(83, 281), (83, 314), (83, 347), (83, 380), (83, 413), (83, 446), (83, 479), (83, 512),
(116, 17), (116, 50), (116, 83), (116, 116), (116, 149), (116, 182), (116, 215), (116, 248),
(116, 281), (116, 314), (116, 347), (116, 380), (116, 413), (116, 446), (116, 479), (116, 512),
(149, 17), (149, 50), (149, 83), (149, 116), (149, 149), (149, 182), (149, 215), (149, 248),
(149, 281), (149, 314), (149, 347), (149, 380), (149, 413), (149, 446), (149, 479), (149, 512),
(182, 17), (182, 50), (182, 83), (182, 116), (182, 149), (182, 182), (182, 215), (182, 248),
(182, 281), (182, 314), (182, 347), (182, 380), (182, 413), (182, 446), (182, 479), (182, 512),
(215, 17), (215, 50), (215, 83), (215, 116), (215, 149), (215, 182), (215, 215), (215, 248),
(215, 281), (215, 314), (215, 347), (215, 380), (215, 413), (215, 446), (215, 479), (215, 512),
(248, 17), (248, 50), (248, 83), (248, 116), (248, 149), (248, 182), (248, 215), (248, 248),
(248, 281), (248, 314), (248, 347), (248, 380), (248, 413), (248, 446), (248, 479), (248, 512),
(281, 17), (281, 50), (281, 83), (281, 116), (281, 149), (281, 182), (281, 215), (281, 248),
(281, 281), (281, 314), (281, 347), (281, 380), (281, 413), (281, 446), (281, 479), (281, 512),
(314, 17), (314, 50), (314, 83), (314, 116), (314, 149), (314, 182), (314, 215), (314, 248),
(314, 281), (314, 314), (314, 347), (314, 380), (314, 413), (314, 446), (314, 479), (314, 512),
(347, 17), (347, 50), (347, 83), (347, 116), (347, 149), (347, 182), (347, 215), (347, 248),
(347, 281), (347, 314), (347, 347), (347, 380), (347, 413), (347, 446), (347, 479), (347, 512),
(380, 17), (380, 50), (380, 83), (380, 116), (380, 149), (380, 182), (380, 215), (380, 248),
(380, 281), (380, 314), (380, 347), (380, 380), (380, 413), (380, 446), (380, 479), (380, 512),
(413, 17), (413, 50), (413, 83), (413, 116), (413, 149), (413, 182), (413, 215), (413, 248),
(413, 281), (413, 314), (413, 347), (413, 380), (413, 413), (413, 446), (413, 479), (413, 512),
(446, 17), (446, 50), (446, 83), (446, 116), (446, 149), (446, 182), (446, 215), (446, 248),
(446, 281), (446, 314), (446, 347), (446, 380), (446, 413), (446, 446), (446, 479), (446, 512),
(479, 17), (479, 50), (479, 83), (479, 116), (479, 149), (479, 182), (479, 215), (479, 248),
(479, 281), (479, 314), (479, 347), (479, 380), (479, 413), (479, 446), (479, 479), (479, 512),
(512, 17), (512, 50), (512, 83), (512, 116), (512, 149), (512, 182), (512, 215), (512, 248),
(512, 281), (512, 314), (512, 347), (512, 380), (512, 413), (512, 446), (512, 479), (512, 512)]
class Snake(games.Sprite):
""" The snake. """
image = games.load_image("snake_sprite.png")
def update(self):
""" Move up, down, left, and right. """
#move up/down/left/right with arrow keys
if games.keyboard.is_pressed(games.K_UP) or games.keyboard.is_pressed(games.K_DOWN):
if games.keyboard.is_pressed(games.K_UP):
self.dy = -2
self.dx = 0
if games.keyboard.is_pressed(games.K_DOWN):
self.dy = 2
self.dx = 0
if self.x > 0 and self.x < 35:
self.x = 17
if self.x > 34 and self.x < 68:
self.x = 50
if self.x > 67 and self.x < 101:
self.x = 83
if self.x > 100 and self.x < 134:
self.x = 116
if self.x > 133 and self.x < 167:
self.x = 149
if self.x > 166 and self.x < 200:
self.x = 182
if self.x > 199 and self.x < 233:
self.x = 215
if self.x > 232 and self.x < 266:
self.x = 248
if self.x > 265 and self.x < 299:
self.x = 281
if self.x > 298 and self.x < 332:
self.x = 314
if self.x > 331 and self.x < 365:
self.x = 347
if self.x > 364 and self.x < 397:
self.x = 380
if self.x > 397 and self.x < 431:
self.x = 413
if self.x > 430 and self.x < 464:
self.x = 446
if self.x > 463 and self.x < 497:
self.x = 479
if self.x > 496 and self.x < 530:
self.x = 512
if games.keyboard.is_pressed(games.K_LEFT) or games.keyboard.is_pressed(games.K_RIGHT):
if games.keyboard.is_pressed(games.K_LEFT):
self.dx = -2
self.dy = 0
if games.keyboard.is_pressed(games.K_RIGHT):
self.dx = 2
self.dy = 0
if self.y > 0 and self.y < 35:
self.y = 17
if self.y > 34 and self.y < 68:
self.y = 50
if self.y > 67 and self.y < 101:
self.y = 83
if self.y > 100 and self.y < 134:
self.y = 116
if self.y > 133 and self.y < 167:
self.y = 149
if self.y > 166 and self.y < 200:
self.y = 182
if self.y > 199 and self.y < 233:
self.y = 215
if self.y > 232 and self.y < 266:
self.y = 248
if self.y > 265 and self.y < 299:
self.y = 281
if self.y > 298 and self.y < 332:
self.y = 314
if self.y > 331 and self.y < 365:
self.y = 347
if self.y > 364 and self.y < 397:
self.y = 380
if self.y > 397 and self.y < 431:
self.y = 413
if self.y > 430 and self.y < 464:
self.y = 446
if self.y > 463 and self.y < 497:
self.y = 479
if self.y > 496 and self.y < 530:
self.y = 512
#collision with wall
if self.bottom > games.screen.height or self.top < 0 or self.right > games.screen.width or self.left < 0:
self.die()
### THE PICTURE IS TOO BIG (BEING BASED OFF PICTURE AND NOT GREEN DOT)
def die(self):
self.destroy()
class Food(games.Sprite):
""" Food that the snake eats. """
image = games.load_image("food_sprite.png")
def __init__(self, x, y):
""" Create food. """
super(Food, self).__init__(
image = Food.image,
x = x, y = y)
def update(self):
"""Check for overlap. """
if self.overlapping_sprites:
self.die()
def die(self):
"""Destroy food. """
food_space = random.choice(squares)
x = food_space[0]
y = food_space[1]
new_food = Food(x = x,
y = y)
games.screen.add(new_food)
self.destroy()
def main():
#background
grid_image = games.load_image("grid.png")
games.screen.background = grid_image
#create snake
snake = Snake(image = Snake.image,
x = games.screen.width/2,
y = games.screen.height/2)
games.screen.add(snake)
#create food
food_space = random.choice(squares)
x = food_space[0]
y = food_space[1]
new_food = Food(x = x,
y = y)
games.screen.add(new_food)
games.screen.mainloop()
main()
我正在使用 Python 3.1，但任何建议都会有所帮助。