A simple snake game

Author: prashantgo

Game_Development/Snake_Game/apple2.png

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+import random
+import pygame
+
+pygame.init()
+
+white = (255, 255, 255)
+black = (0, 0, 0)
+red = (255, 0, 0)
+green = (0, 255, 0)
+
+display_width = 900
+display_height = 600
+block_size = 30
+speed = 30
+apple_thickness = 30
+
+gameDisplay = pygame.display.set_mode((display_width, display_height))
+pygame.display.set_caption('Slither')
+apple_img = pygame.image.load('apple2.png')
+snakeHead = pygame.image.load('snakehead.png')
+pygame.display.set_icon(apple_img)
+clock = pygame.time.Clock()
+
+FPS = 15
+small_font = pygame.font.SysFont(None, 25)
+med_font = pygame.font.SysFont(None, 50)
+large_font = pygame.font.SysFont(None, 80)
+
+
+def pause():
+
+    paused = True
+    message_to_screen("Game Paused", red, -100, "large")
+    message_to_screen("press C to continue,R to restart and Q to quit", black, 25)
+    pygame.display.update()
+    while paused:
+        for event in pygame.event.get():
+            if event.type == pygame.KEYDOWN:
+                if event.key == pygame.K_q:
+                    pygame.quit()
+                    quit()
+                elif event.key == pygame.K_c:
+                    paused = False
+                elif event.key == pygame.K_r:
+                    paused = False
+                    game_loop()
+            elif event.type == pygame.QUIT:
+                pygame.quit()
+                quit()
+
+
+def score(underscore):
+    text = small_font.render("score: " + str(underscore), True, black)
+    gameDisplay.blit(text, [10, 10])
+
+
+def snake(snake_list, direction):
+    if direction == 'right':
+        head = pygame.transform.rotate(snakeHead, 270)
+    elif direction == 'left':
+        head = pygame.transform.rotate(snakeHead, 90)
+    elif direction == 'top':
+        head = pygame.transform.rotate(snakeHead, 0)
+    else:
+        head = pygame.transform.rotate(snakeHead, 180)
+    gameDisplay.blit(head, [snake_list[-1][0], snake_list[-1][1]])
+    for xny in snake_list[:-1]:
+        pygame.draw.rect(gameDisplay, green, [xny[0], xny[1], block_size, block_size])
+
+
+def text_objects(text, color, size):
+    text_surf = small_font.render(text, True, color)
+    if size == "small":
+        text_surf = small_font.render(text, True, color)
+    elif size == "medium":
+        text_surf = med_font.render(text, True, color)
+    elif size == "large":
+        text_surf = large_font.render(text, True, color)
+    return text_surf, text_surf.get_rect()
+
+
+def message_to_screen(msg, color, y_displace=0, size='small'):
+    text_surf, text_rect = text_objects(msg, color, size)
+    text_rect.center = (display_width / 2), (display_height / 2) + y_displace
+    gameDisplay.blit(text_surf, text_rect)
+
+
+def game_intro():
+    intro = True
+
+    while intro:
+        gameDisplay.fill(white)
+        message_to_screen("Welcome to Slither", green, -100, "large")
+        message_to_screen("Press C to play, P to pause, R to restart and Q to exit", black, -20, "small")
+        pygame.display.update()
+        clock.tick(5)
+
+        for event in pygame.event.get():
+            if event.type == pygame.KEYDOWN:
+                if event.key == pygame.K_q:
+                    pygame.quit()
+                    quit()
+                elif event.key == pygame.K_c:
+                    intro = False
+            elif event.type == pygame.QUIT:
+                pygame.quit()
+                quit()
+
+
+def game_loop():
+
+    game_exit = False
+    game_over = False
+
+    lead_x = display_width / 2
+    lead_y = display_height / 2
+
+    lead_x_change = speed
+    lead_y_change = 0
+
+    snake_list = []
+    snake_length = 1
+
+    rand_apple_x = random.randrange(0, display_width - apple_thickness + 1, 30)
+    rand_apple_y = random.randrange(0, display_height - apple_thickness + 1, 30)
+
+    direction = 'right'
+
+    while not game_exit:
+
+        if game_over:
+            message_to_screen("Game over ", red, y_displace=-50, size="large")
+            message_to_screen("Your score is: " + str(snake_length - 1), green, y_displace=10, size="medium")
+            message_to_screen("press C to continue, Q to quit", black, y_displace=60, size="medium")
+            pygame.display.update()
+
+        while game_over:
+            for event in pygame.event.get():
+                if event.type == pygame.KEYDOWN:
+                    if event.key == pygame.K_q:
+                        game_exit = True
+                        game_over = False
+                    elif event.key == pygame.K_c:
+                        game_loop()
+                elif event.type == pygame.QUIT:
+                    game_exit = True
+                    game_over = False
+
+        for event in pygame.event.get():
+            if event.type == pygame.QUIT:
+                game_exit = True
+            elif event.type == pygame.KEYDOWN:
+                if event.key == pygame.K_q:
+                    game_exit = True
+                    game_over = False
+                elif event.key == pygame.K_LEFT:
+                    lead_x_change = -speed
+                    lead_y_change = 0
+                    direction = 'left'
+                elif event.key == pygame.K_RIGHT:
+                    lead_x_change = speed
+                    lead_y_change = 0
+                    direction = 'right'
+                elif event.key == pygame.K_UP:
+                    lead_y_change = -speed
+                    lead_x_change = 0
+                    direction = 'top'
+                elif event.key == pygame.K_DOWN:
+                    lead_y_change = speed
+                    lead_x_change = 0
+                    direction = 'down'
+                elif event.key == pygame.K_p:
+                    pause()
+                elif event.key == pygame.K_r:
+                    game_loop()
+
+        if lead_x < 0 or lead_x > display_width - block_size or lead_y < 0 or lead_y > display_height - block_size:
+            game_over = True
+
+        lead_x += lead_x_change
+        lead_y += lead_y_change
+        gameDisplay.fill(white)
+        while [rand_apple_x, rand_apple_y] in snake_list:
+            rand_apple_x = random.randrange(0, display_width - apple_thickness + 1, 30)
+            rand_apple_y = random.randrange(0, display_height - apple_thickness + 1, 30)
+        gameDisplay.blit(apple_img, (rand_apple_x, rand_apple_y))
+
+        snake_head = list()
+        snake_head.append(lead_x)
+        snake_head.append(lead_y)
+        snake_list.append(snake_head)
+
+        for each in snake_list[:-2]:
+            if each == snake_head:
+                game_over = True
+
+        if len(snake_list) > snake_length:
+            del snake_list[0]
+
+        snake(snake_list, direction)
+        score(snake_length - 1)
+        pygame.display.update()
+
+        if rand_apple_x <= lead_x < rand_apple_x + apple_thickness:
+            if rand_apple_y <= lead_y < rand_apple_y + apple_thickness or rand_apple_y <= lead_y + block_size - 1 < \
+                    rand_apple_y + apple_thickness:
+                rand_apple_x = random.randrange(0, display_width - apple_thickness + 1, 30)
+                rand_apple_y = random.randrange(0, display_height - apple_thickness + 1, 30)
+                snake_length += 1
+
+        elif rand_apple_y <= lead_y < rand_apple_y + apple_thickness:
+            if rand_apple_x <= lead_x + block_size - 1 < rand_apple_x + apple_thickness or rand_apple_x <= lead_x < \
+                    rand_apple_x + apple_thickness:
+                rand_apple_x = random.randrange(0, display_width - apple_thickness + 1, 30)
+                rand_apple_y = random.randrange(0, display_height - apple_thickness + 1, 30)
+                snake_length += 1
+        clock.tick(FPS)
+
+    pygame.quit()
+    quit()
+
+game_intro()
+game_loop()