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Python實(shí)現(xiàn)貪吃蛇小游戲(單人模式)

發(fā)布日期:2022-01-24 10:08 | 文章來源:CSDN

簡(jiǎn)單用py寫了一個(gè)貪吃蛇游戲,有單人、雙人模式,比較簡(jiǎn)單,適合初學(xué)者練手。基本上每行重要的語(yǔ)句都有注釋,做了什么事一目了然

這里先介紹單人模式

一、游戲設(shè)計(jì)要點(diǎn)

1.游戲主體窗口(尺寸)、畫布(尺寸、位置)、按鈕(尺寸、位置)、文字(大小、顏色、位置)、圖像、背景音樂及相關(guān)響應(yīng)函數(shù)(主要是鼠標(biāo)移動(dòng)及點(diǎn)擊的響應(yīng))的設(shè)計(jì)與合理排布
2.蛇與食物的類的屬性設(shè)計(jì)
3.蛇位置的更新(根據(jù)鍵盤輸入)、吃到食物加分的判定、食物的更新
4.蛇死亡的判定條件設(shè)計(jì)

二、主要模塊

1.pygame
2.sys
3.random

三、用到的類

1.Snake類,定義蛇頭蛇身元素的位置
2.Food類,定義食物元素的位置及單個(gè)元素的顏色

四、主要函數(shù)

1.new_food(),功能:生成一個(gè)不與蛇頭位置重合的食物并返回該食物對(duì)象

def new_food(head):
 while True:
  # 循環(huán),不斷實(shí)例化new_food對(duì)象直到生成一個(gè)不與蛇頭重合的食物
  new_food = Food(randint(0, 45) * 20, randint(0, 28) * 20, (randint(10, 255), randint(10, 255), randint(10, 255)))
  # 若new_food和蛇頭重合則不創(chuàng)鍵
  if new_food.x != head.x and new_food.y != head.y:
break
  else:
continue
 return new_food

2.draw_snake()、draw_food()函數(shù),功能:繪制蛇與食物的圖像,傳入?yún)?shù)為顏色和對(duì)象:

# 在窗體中繪制貪吃蛇
# 形參:一個(gè)是顏色另一個(gè)是實(shí)例化對(duì)象
def draw_snake(color, object):
 pygame.draw.circle(window, color, (object.x, object.y), 10)
 
# 在窗體中繪制食物
# 形參:實(shí)例化對(duì)象
def draw_food(food):
 pygame.draw.circle(window, food.color, (food.x, food.y), 10)

3.show_end函數(shù),功能:顯示單人模式結(jié)束時(shí)的得分界面:

# 游戲結(jié)束時(shí),單人模式顯示得分的窗體的設(shè)置
def show_end_single():
 while True:
  window.blit(init_background, (0, 0))
  for event in pygame.event.get():
if event.type == pygame.QUIT:
 exit_end()
  # 定義標(biāo)題
  pygame.display.set_caption("貪吃蛇大冒險(xiǎn)")
  # 定義提示文字
  font = pygame.font.SysFont("simHei", 40)
  fontsurf = font.render('游戲結(jié)束! 你的得分為: %s' % score, False, black)
  window.blit(fontsurf, (250, 100))
  button("返回主菜單", 370, 300, 200, 40, blue, brightred, into_game)
  button("退出游戲", 370, 470, 200, 40, red, brightred, exit_end)
  pygame.display.update()
  clock.tick(20)

4.exit_end()函數(shù),功能:在初始界面和游戲結(jié)束顯示得分界面點(diǎn)擊右上角的"×"時(shí),直接退出整個(gè)游戲:

def exit_end():
 pygame.quit()
 sys.exit()

5.start_game()函數(shù),功能:實(shí)現(xiàn)單人正常模式:

def start_game():
 # 播放音樂
 pygame.mixer.music.play(-1)
 # 定義存分?jǐn)?shù)的全局變量
 global score
 score = 0
 # 定義存放玩家鍵盤輸入運(yùn)動(dòng)方向的變量,初始為向右
 run_direction = "right"
 # 定義貪吃蛇運(yùn)動(dòng)方向的變量,初始為玩家鍵入方向
 run = run_direction
 # 實(shí)例化貪吃蛇和食物對(duì)象
 head = Snake(randint(0, 30) * 20, randint(0, 20) * 20)
 # 實(shí)例化蛇身長(zhǎng)度為2個(gè)單位
 snake_body = [Snake(head.x, head.y + 20), Snake(head.x, head.y + 40)]
 # 實(shí)例化食物列表,列表隨著其中食物被吃掉應(yīng)該不斷縮短
 food_list = [Food(randint(0, 45) * 20, randint(0, 28) * 20, (randint(10, 255), randint(10, 255), randint(10, 255)))]
 for i in range(1,24):
  food_list.append(Food(randint(0, 45) * 20, randint(0, 28) * 20, (randint(10, 255), randint(10, 255), randint(10, 255))))
 # 實(shí)例化單個(gè)食物,方便循環(huán)內(nèi)生成單個(gè)新食物
 food = Food(randint(0, 45) * 20, randint(0, 28) * 20, (randint(10, 255), randint(10, 255), randint(10, 255)))
 while True:
  window.blit(background, (0,0))
  # 監(jiān)聽玩家鍵盤輸入的運(yùn)動(dòng)方向值,并根據(jù)輸入轉(zhuǎn)為up、down、right或left,方便程序中調(diào)用
  # pygame.event.get()返回一個(gè)列表,存放本次game執(zhí)行中程序遇到的一連串事件(按時(shí)間順序依次存放)
  for event in pygame.event.get():
# pygame.QUIT事件是指用戶點(diǎn)擊窗口右上角的"×"
if event.type == pygame.QUIT:
 # 顯示結(jié)果界面
 show_end()
# 若事件類型是按下鍵盤,分↑ ↓ ← →四種情況討論
elif event.type == pygame.KEYDOWN:
 # 若事件類型是按下鍵盤↑
 # key是鍵值,表示按下去的鍵值是什么
 if event.key == ord('w'):
  run_direction = "up"
 # 若事件類型是按下鍵盤↓
 if event.key == ord('s'):
  run_direction = "down"
 # 若事件類型是按下鍵盤←
 if event.key == ord('a'):
  run_direction = "left"
 # 若事件類型是按下鍵盤→
 if event.key == ord('d'):
  run_direction = "right"
  # 繪制初始化的25個(gè)食物圖像(24+1=25)
  # 隨著該列表中的食物被吃掉,列表應(yīng)該不斷pop以清除已經(jīng)被吃的事物
  for item in food_list:
draw_food(item)
  # 繪制被貪吃蛇吃掉后新增的食物圖像
  draw_food(food)
  # 繪制蛇頭圖像
  draw_snake(black, head)
  # 繪制蛇身圖像
  for item in snake_body:
draw_snake(blue, item)
  # 判斷貪吃蛇原運(yùn)動(dòng)方向(run)與玩家鍵盤輸入的運(yùn)動(dòng)方向(run_direction)是否違反正常運(yùn)動(dòng)情況
  if run == "up" and not run_direction == "down":
run = run_direction
  elif run == "down" and not run_direction == "up":
run = run_direction
  elif run == "left" and not run_direction == "right":
run = run_direction
  elif run == "right" and not run_direction == "left":
run = run_direction
  # 插入蛇頭位置到蛇身列表中
  snake_body.insert(0, Snake(head.x, head.y))
  # 根據(jù)玩家鍵入方向進(jìn)行蛇頭xy的更新
  if run == "up":
head.y -= 20
  elif run == "down":
head.y += 20
  elif run == "left":
head.x -= 20
  elif run == "right":
head.x += 20
  # 判斷是否死亡
  die_flag = False
  # 遍歷存放貪吃蛇位姿的列表,從第1個(gè)開始,(第0個(gè)位蛇頭)
  for body in snake_body[1:]:
# 如果蛇頭的xy和蛇身xy相等,則判定相撞,設(shè)置flag為ture
if head.x == body.x and head.y == body.y:
 die_flag = True
  # 若蛇頭的xy在顯示窗體外,或flag為true,則顯示結(jié)束界面,并退出游戲
  if die_flag == True or head.x < 0 or head.x > 960 or head.y < 0 or head.y > 600:
# 停止播放音樂
pygame.mixer.music.stop()
show_end()
  # die_snake(head, snake_body)
  # 判斷蛇頭和食物坐標(biāo),若相等,則加分,并生成新的食物
  # 定義標(biāo)志,表明是否找到和蛇頭相等的事物
  global flag
  flag = 0
  # 如果蛇頭和食物重合
  for item in food_list:
if head.x == item.x and head.y == item.y or head.x == food.x and head.y == food.y:
 flag = 1
 score += 1
 # 彈出被吃掉的這個(gè)食物
 food_list.pop(food_list.index(item))
 # 再產(chǎn)生一個(gè)食物
 food = new_food(head)
 # 把新食物插入food_list,下一次循環(huán)中會(huì)更新繪制食物全體
 food_list.append(food)
 break
  if flag == 0:
snake_body.pop()
  font = pygame.font.SysFont("simHei", 25)
  mode_title = font.render('正常模式', False, grey)
  socre_title = font.render('得分: %s' % score, False, grey)
  window.blit(mode_title, (50, 30))
  window.blit(socre_title, (50, 65))
  # 更新蛇頭蛇身和食物的數(shù)據(jù)
  pygame.display.update()
  # 通過幀率設(shè)置貪吃蛇速度
  clock.tick(8)

6.start_kgame()函數(shù),功能:實(shí)現(xiàn)單人穿墻模式:

def start_kgame_single():
 # 播放音樂
 pygame.mixer.music.play(-1)
 global score
 score = 0
 # 定義存放玩家鍵盤輸入運(yùn)動(dòng)方向的變量,初始為向右
 run_direction = "right"
 # 定義貪吃蛇運(yùn)動(dòng)方向的變量,初始為玩家鍵入方向
 run = run_direction
 # 實(shí)例化蛇頭、蛇身、食物對(duì)象
 head = Snake(160, 160)
 # 實(shí)例化蛇身
 snake_body = [Snake(head.x, head.y + 20), Snake(head.x, head.y + 40), Snake(head.x, head.y + 60)]
 # 實(shí)例化食物列表,列表隨著其中食物被吃掉應(yīng)該不斷縮短
 food_list = [Food(randint(0, 45) * 20, randint(0, 28) * 20, (randint(10, 255), randint(10, 255), randint(10, 255)))]
 for i in range(1,24):
  food_list.append(Food(randint(0, 45) * 20, randint(0, 28) * 20, (randint(10, 255), randint(10, 255), randint(10, 255))))
 # 實(shí)例化單個(gè)食物,方便循環(huán)內(nèi)生成單個(gè)新食物
 food = Food(randint(0, 45) * 20, randint(0, 28) * 20, (randint(10, 255), randint(10, 255), randint(10, 255)))
 # 死循環(huán),監(jiān)聽鍵盤鍵值
 while True:
  window.blit(background, (0, 0))
  for event in pygame.event.get():
if event.type == pygame.QUIT:
 show_end_single()
elif event.type == pygame.KEYDOWN:
 # 若事件類型是按下鍵盤w
 # key是鍵值,表示按下去的鍵值是什么
 if event.key == ord('w'):
  run_direction = "up"
 # 若事件類型是按下鍵盤s
 if event.key == ord('s'):
  run_direction = "down"
 # 若事件類型是按下鍵盤a
 if event.key == ord('a'):
  run_direction = "left"
 # 若事件類型是按下鍵盤d
 if event.key == ord('d'):
  run_direction = "right"
  # 繪制初始化的25個(gè)食物圖像(24+1=25)
  # 隨著該列表中的食物被吃掉,列表應(yīng)該不斷pop以清除已經(jīng)被吃的事物
  for item in food_list:
draw_food(item)
  # 繪制被貪吃蛇吃掉后新增的食物圖像
  draw_food(food)
  # 繪制蛇頭圖像
  draw_snake(black, head)
  # 繪制蛇身圖像
  for item in snake_body:
draw_snake(blue, item)
  # 判斷貪吃蛇原運(yùn)動(dòng)方向與玩家鍵盤輸入的運(yùn)動(dòng)方向是否違反正常運(yùn)動(dòng)情況
  if run == "up" and not run_direction == "down":  # 若運(yùn)動(dòng)方向?yàn)橄蛏?,玩家輸入運(yùn)動(dòng)方向向下,則違背貪吃蛇正常運(yùn)動(dòng)情況
run = run_direction
  elif run == "down" and not run_direction == "up":
run = run_direction
  elif run == "left" and not run_direction == "right":
run = run_direction
  elif run == "right" and not run_direction == "left":
run = run_direction
  # 插入蛇頭位置到蛇身列表中
  snake_body.insert(0, Snake(head.x, head.y))
  # 根據(jù)玩家鍵入方向進(jìn)行蛇頭xy的更新
  if run == "up":
head.y -= 20
  elif run == "down":
head.y += 20
  elif run == "left":
head.x -= 20
  elif run == "right":
head.x += 20
  # 穿墻實(shí)現(xiàn)
  # 定義標(biāo)志位
  die_flag = False
  # 遍歷,蛇頭碰到蛇身時(shí),flag為true退出游戲
  for body in snake_body[1:]:
if head.x == body.x and head.y == body.y:
 die_flag = True
  if die_flag:
pygame.mixer.music.stop()
show_end()
  else: 
# 當(dāng)蛇頭穿出窗體時(shí)有四種情況,分別討論
if head.x < 0:
 head.x = 960
if head.x > 960:
 head.x = 0
if head.y < 0:
 head.y = 600
if head.y > 600:
 head.y = 0
  # 判斷蛇頭和食物坐標(biāo),若相等,則加分,并生成新的食物
  # 定義標(biāo)志,表明是否找到和蛇頭相等的事物
  global flag
  flag = 0
  # 如果蛇頭和食物重合
  for item in food_list:
if head.x == item.x and head.y == item.y or head.x == food.x and head.y == food.y:
 flag = 1
 score += 1
 # 彈出被吃掉的這個(gè)食物
 food_list.pop(food_list.index(item))
 # 再產(chǎn)生一個(gè)食物
 food = new_food(head)
 # 把新食物插入food_list,下一次循環(huán)中會(huì)更新繪制食物全體
 food_list.append(food)
 break
  # 若沒吃到食物則從蛇身pop一個(gè)元素以更新蛇位置
  if flag == 0:
snake_body.pop()
  font = pygame.font.SysFont("simHei", 25)
  mode_title = font.render('穿墻模式', False, grey)
  socre_title = font.render('得分: %s' % score, False, grey)
  window.blit(mode_title, (50, 30))
  window.blit(socre_title, (50, 65))
  # 繪制更新
  pygame.display.update()
  # 通過幀率設(shè)置貪吃蛇速度
  clock.tick(8)

7.button()函數(shù),功能:實(shí)現(xiàn)按鈕樣式設(shè)計(jì)和響應(yīng)鼠標(biāo)操作:

def button(msg, x, y, w, h, ic, ac, action=None):
 # 獲取鼠標(biāo)位置
 mouse = pygame.mouse.get_pos()
 # 獲取鼠標(biāo)點(diǎn)擊情況
 click = pygame.mouse.get_pressed()
 if x + w > mouse[0] > x and y + h > mouse[1] > y:
  pygame.draw.rect(window, ac, (x, y, w, h))
  if click[0] == 1 and action != None:
action()
 else:
  pygame.draw.rect(window, ic, (x, y, w, h))
 # 設(shè)置按鈕中的文字樣式和居中對(duì)齊
 font = pygame.font.SysFont('simHei', 20)
 smallfont = font.render(msg, True, white)
 smallrect = smallfont.get_rect()
 smallrect.center = ((x + (w / 2)), (y + (h / 2)))
 window.blit(smallfont, smallrect)

8.into_game()函數(shù),功能:實(shí)現(xiàn)游戲初始界面,選擇模式:

def into_game():
 while True:
  window.blit(init_background, (0, 0))
  for event in pygame.event.get():
if event.type == pygame.QUIT:
 exit_end()
  # 設(shè)置字體
  font = pygame.font.SysFont("simHei", 50)
  # 初始界面顯示文字
  fontsurf = font.render('歡迎來到貪吃蛇大冒險(xiǎn)!', True, black)  # 文字
  fontrect = fontsurf.get_rect()
  fontrect.center = ((480), 200)
  window.blit(fontsurf, fontrect)
  button("正常模式", 370, 370, 200, 40, blue, brightred, start_game)
  button("可穿墻模式", 370, 420, 200, 40, violte, brightred, start_kgame)
  button("退出游戲", 370, 470, 200, 40, red, brightred, exit_end)
  pygame.display.update()
  clock.tick(20)

9.主函數(shù),功能:初始化參數(shù)設(shè)定,進(jìn)入游戲:

if __name__ == '__main__':
 # 定義需要用到的顏色
 white = (255, 255, 255)
 red = (200, 0, 0)
 green = (0, 128, 0)
 blue = (0, 202, 254)
 violte = (194, 8, 234)
 brightred = (255, 0, 0)
 brightgreen = (0, 255, 0)
 black = (0, 0, 0)
 grey = (129, 131, 129)
 # 設(shè)計(jì)窗口
 window = pygame.display.set_mode((960, 600))
 # 定義標(biāo)題
 pygame.display.set_caption("貪吃蛇大冒險(xiǎn)")
 # 定義背景圖片
 init_background = pygame.image.load("image/init_bgimg.jpg")
 background = pygame.image.load("image/bgimg.jpg")
 # 背景音樂
 pygame.mixer.init()
 pygame.mixer.music.load("background.mp3")
 # 創(chuàng)建時(shí)鐘
 clock = pygame.time.Clock()
 # 初始化,自檢所有模塊是否完整
 pygame.init()
 # 初始界面
 into_game()

注:其中的圖片、背景音樂需要自己找合適(尺寸要與窗口大小相適應(yīng))的,也可以參考我上傳的資源:貪吃蛇單人版源代碼+背景+音樂

附:Blog:雙人模式詳解

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