class Snake_game:
'''Main class to maintain game assets and behavior '''
def __init__(self):
'''Init game and create game resourses'''
pygame.init()
self.settings = Settings()
self.screen = pygame.display.set_mode(
(self.settings.screen_width, self.settings.screen_height))
pygame.display.set_caption('Snake Game')
self.screen_rect = self.screen.get_rect()
self.button = Button(self, 'Play')
self.sb = Scoreboard(self)
self.rect_x = self.screen_rect.centerx
self.rect_y = self.screen_rect.centery
self.rect_width = 20
self.rect_height = 20
self.snake_speed = 20
# apple settings
self.apple_dim = 20
'''
self.apple_x = random.randrange(0, self.settings.screen_width - self.rect_width, self.rect_width)
self.apple_y = random.randrange(0, self.settings.screen_height - self.rect_height, self.rect_width)
'''
self.apple_x = random.randrange(
self.settings.game_start_x,
self.settings.game_end_x - self.rect_width, self.rect_width)
self.apple_y = random.randrange(
self.settings.game_start_y,
self.settings.game_end_y - self.rect_height, self.rect_width)
self.last_key = pygame.K_w
self.direction = None
self.green = (0, 255, 0)
self.red = (255, 0, 0)
self.grey = (100, 100, 100)
self.clock = pygame.time.Clock()
self.FPS = 20 #10
#collision check
self.collide = False
self.snakelist = []
self.snake_len = 1
self.snake_lives = 3
self.game_active = False
#self.score = 0
def run_game(self):
'''Main game loop'''
while True:
self._intro_screen()
while self.game_active:
self._update_screen() # update graphics
self._check_events(
) #check for inputs and increase snake positions
self._update_snake_head(
) #update snake list and head positions, we store all positions deleting the first position to keep same with snake length
self._collision() # determine
def _check_events(self):
''' Determine when to change directions and not allow the snake to go over its own body
do this by storing direction and not allowing to go left than right etc.'''
# last_key is the key pressed
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_d and self.direction != 'left':
self.last_key = event.key
self.direction = 'right'
#self.rect_x += 5
elif event.key == pygame.K_a and self.direction != 'right':
self.last_key = event.key
self.direction = 'left'
elif event.key == pygame.K_w and self.direction != 'down':
self.last_key = event.key
self.direction = 'up'
elif event.key == pygame.K_s and self.direction != 'up':
self.last_key = event.key
self.direction = 'down'
elif event.key == pygame.K_q:
sys.exit()
# allow the snake to stay in the game board and allow continous movement by using self.last_key to store direction
if self.last_key == pygame.K_d and (
self.rect_x + self.rect_width
) < self.settings.game_end_x: #self.screen_rect.right:
self.rect_x += self.snake_speed
elif self.last_key == pygame.K_a and (
self.rect_x) > self.settings.game_start_x: #0:
self.rect_x -= self.snake_speed
elif self.last_key == pygame.K_w and (
self.rect_y) > self.settings.game_start_y: #0:
self.rect_y -= self.snake_speed
elif self.last_key == pygame.K_s and (
self.rect_y + self.rect_height
) < self.settings.game_end_y: #self.settings.screen_height:
self.rect_y += self.snake_speed
def _draw_rect(self, color, x, y, width, height):
pygame.draw.rect(self.screen, color, [x, y, width, height])
def _draw_apple(self):
self._draw_rect(self.red, self.apple_x, self.apple_y, self.apple_dim,
self.apple_dim)
def _collision(self):
'''Determine collision of the snake and apple'''
if self.rect_x == self.apple_x and self.rect_y == self.apple_y:
self.apple_loc = [self.apple_x, self.apple_y]
#have to make sure the apple is not placed within the snake position
while True:
if self.apple_loc in self.snakelist:
self.apple_x = random.randrange(
self.settings.game_start_x,
self.settings.game_end_x - self.rect_width,
self.rect_width)
self.apple_y = random.randrange(
self.settings.game_start_y,
self.settings.game_end_y - self.rect_height,
self.rect_width)
# set new postion of the apple location
self.apple_loc[0] = self.apple_x
self.apple_loc[1] = self.apple_y
else:
break
#self.collide = True
self.snake_len += 1
self.settings.score += 10
self.sb.prep_score()
def _draw_grid(self):
for i in range(self.settings.game_start_y,
self.settings.game_end_y + 1, self.rect_height):
pygame.draw.line(self.screen, self.grey,
[self.settings.game_start_x, i],
[self.settings.game_end_x, i], 1)
for j in range(self.settings.game_start_x,
self.settings.game_end_x + 1, self.rect_height):
pygame.draw.line(self.screen, self.grey,
[j, self.settings.game_start_y],
[j, self.settings.game_end_y], 1)
def _update_snake_head(self):
self.snake_head = []
self.snake_head.append(self.rect_x)
self.snake_head.append(self.rect_y)
if self.snake_head not in self.snakelist:
self.snakelist.append(self.snake_head)
else:
self._game_rules()
def snake(self, snakelist):
'''Snake is gonna be contolled by a list of lists [[x1,y1], [x2, y2]] storing all positions of
the snake until the length of the snake_len'''
if len(self.snakelist) > self.snake_len:
del self.snakelist[0]
for xy in snakelist:
self._draw_rect(self.green, xy[0], xy[1], self.rect_height,
self.rect_height)
def _game_rules(self):
'''reset the snake in the middle and reduce the amount of lives'''
if self.snake_len > 1:
#print('Cross Over')
self.rect_x = self.screen_rect.centerx
self.rect_y = self.screen_rect.centery
self.snakelist.clear()
self.snake_lives -= 1
time.sleep(1)
if self.snake_lives == 0:
self.game_active = False
self.snakelist.clear()
self.snake_len = 1
self.settings.score = 0
self.sb.prep_score()
self.snake_lives = 3
def _update_screen(self):
# update and draw graphic items and control FPS
self.screen.fill((0, 0, 0))
self.snake(self.snakelist)
self._draw_apple()
self._draw_grid()
self.sb.show_score()
pygame.display.flip()
self.clock.tick(self.FPS)
def _intro_screen(self):
#self.screen.fill((0, 0, 0))
self.button.draw_button()
self.button._credit()
self._start_click()
pygame.display.flip()
def _start_click(self):
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
elif event.type == pygame.MOUSEBUTTONDOWN:
mouse_pos = pygame.mouse.get_pos()
self._check_play_button(mouse_pos)
def _check_play_button(self, mouse_pos):
''' detemine when player clicks and enter game.'''
if self.button.rect.collidepoint(mouse_pos):
self.game_active = True
