用Python的Pygame包实现水果忍者小游戏

先上一下运行结果

长按鼠标左键出刀, 切割水果几分, 切割炸弹结束游戏, 漏掉的水果也会几分, 难度会随时间慢慢提高(水果的刷新频率变快)

初始化

帧率200帧/秒, 游戏窗口大小800×600

# 游戏设置
pygame.init()
FPS = 200
fpsClock = pygame.time.Clock()
WIDTH, HEIGHT = 800, 600
sur = pygame.display.set_mode((WIDTH, HEIGHT))
back = pygame.image.load('back2.jpg')
sur.blit(back, (0, 0))

# 颜色资源
WHITE = (255, 255, 255)
RED  = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE  = (0, 0, 255)
BLACK = (0, 0, 0)
YELLOW = (255, 255, 0)
SILVER = (192, 192, 192)
GRAY = (169, 169, 169)
PURPLE = (127, 0, 255)
PINK = (255, 51, 153)
ORANGE = (255, 128, 0)
BROWN = (165, 42, 42)
LIGHTBLUE = (137, 207, 240)

基础变量

主要是一些语法糖, 图片导入, 和基本存储数据结构的定义, 后面会一一细说这些变量的作用

# 水果变量
MAXFRUIT = 10  # 同时存在的水果最多数量
SCORE = pygame.image.load('score.png')
ERROR = pygame.image.load('error.png')
APPLE, BANANA, PEACH, STRAWBERRY, WATERMELON = 'apple', 'banana', 'peach', 'strawberry', 'watermelon'
FRUIT = (APPLE, BANANA, PEACH, STRAWBERRY, WATERMELON)
# 导入水果图片
FRUIT_IMG = {BANANA:pygame.image.load('banana.png'), APPLE:pygame.image.load('apple.png'),
    PEACH:pygame.image.load('peach.png'), STRAWBERRY:pygame.image.load('strawberry.png'),
    WATERMELON:pygame.image.load('watermelon.png')}
# 导入切割水果图片
FRUITCUT_IMG = {BANANA: (pygame.image.load('banana1.png'), pygame.image.load('banana2.png')),
    APPLE: (pygame.image.load('apple1.png'), pygame.image.load('apple2.png')),
    PEACH: (pygame.image.load('peach1.png'), pygame.image.load('peach2.png')),
    STRAWBERRY: (pygame.image.load('strawberry1.png'), pygame.image.load('strawberry2.png')),
    WATERMELON: (pygame.image.load('watermelon2.png'), pygame.image.load('watermelon1.png'))}
FRUIT_SIZE = {BANANA:(126, 50), APPLE:(65, 65), PEACH:(62, 59), STRAWBERRY:(68, 72),
    WATERMELON:(97, 84)}  # 水果的尺寸
existfruit = 0  # 目前存在水果的数量
fruits = [False for _ in range(MAXFRUIT)]  # 当前存在的水果
cutfruits = [False for _ in range(MAXFRUIT*2)]  # 被切割的水果数组
cut_count = 0  # 已经切割水果的数量
error_count = 0  # 失误次数
boom = None  # 炸弹的信息
BOOMSIZE = (65, 67)  # 炸弹尺寸
points = []  # 刀痕的点存放数组

# 水果类
class Afruit:
    sx, sy = 0, 0  # x和y的速度
    p, t = 0, 0  # 初始位置, 生成时间
    dis, img, fru = None, None, None    # 方向, 图片, 水果类型
    x, y = 0, 0  # 坐标

    def __init__(self, x, y, position, dis, img, fru):
        self.sx, self.sy = x, y
        self.p = position
        self.dis, self.img, self.fru = dis, img, fru

# 被切割的水果类
class Acut_fruit:
    sx = 0  # x速度
    x1, x2 = 0, 0
    y = 0
    fru = None
    t = 0  # 时间
    def __init__(self, sx, x1, x2, y, fru):
        self.sx = sx
        self.x1, self.x2 = x1, x2
        self.y = y
        self.fru = fru

如何随机生成一个水果

水果有八种生成方式, 即: 从左边出来往右上或右下走, 从右边出来往左上或左下走, 从上面出来往左下或右下走, 从下面出来往左上或右上走

在主循环里只需要用随机概率来随机生成即可, 这里difficult表示当前游戏的难度, 每秒平均生成 (8*difficult*FPS) /1000个水果, 也就是每秒平均生成 1.6*difficult 个水果

然后根据不同的生成位置, 设置不同的速度和初始坐标即可, 生成炸弹同理, 这里就不赘述了, 代码如下: 

while True:
        ...
        ...
        if random.randint(0, 1000) < difficult: create_fruit('left_down')
        if random.randint(0, 1000) < difficult: create_fruit('left_up')
        if random.randint(0, 1000) < difficult: create_fruit('right_down')
        if random.randint(0, 1000) < difficult: create_fruit('right_up')
        if random.randint(0, 1000) < difficult: create_fruit('up_left')
        if random.randint(0, 1000) < difficult: create_fruit('up_right')
        if random.randint(0, 1000) < difficult: create_fruit('down_left')
        if random.randint(0, 1000) < difficult: create_fruit('down_right')      


def create_fruit(dis):  # 随机生成一个水果
    global idx, existfruit, MAXFRUIT
    if existfruit >= MAXFRUIT:  # 如果已经存在足够多的水果, 就不生成
        return
    existfruit += 1
    fru = random.choice(FRUIT)  # 水果类型
    img = FRUIT_IMG[fru]  # 获取图片
    if dis in ('left_up', 'right_up'):  # 从两边出来, 往上走
        position = random.randint(300, 650)
        speed_x = random.randint(200, 300)
        speed_y = random.randint(50, 100)
    elif dis in ('left_down', 'right_down'):  # 从两边出来, 往下走
        position = random.randint(-50, 300)
        speed_x = random.randint(200, 300)
        speed_y = random.randint(50, 100)
    elif dis in ('up_left', 'down_left'):  # 从上下出来, 往左走
        position = random.randint(400, 850)
        speed_x = random.randint(100, 300)
        speed_y = random.randint(100, 200)
    elif dis in ('down_right', 'up_right'):  # 从上下出来, 往右走
        position = random.randint(-50, 400)
        speed_x = random.randint(100, 300)
        speed_y = random.randint(100, 200)
    else:
        position, speed_x, speed_y = 0, 0, 0
    for i in range(MAXFRUIT):  # 生成水果
        if not fruits[i]:
            fruits[i] = Afruit(speed_x, speed_y, position, dis, img, fru)
            break  

如何画出刀锋划过的痕迹

首先需要记录鼠标的位置, 从按下左键开始, 每一帧都会搜集鼠标的坐标, 直到松开左键, 在此过程中还要边搜集边画出刀锋

代码思路就用列表来实现动态增删即可

while True:
        ...
        ...
　　　　　　# 根据鼠标走过的点绘制刀锋轨迹
        if points:
            copy = list(points)
            while points[-1][2] - points[0][2] >= 0.05:
                points.pop(0)
            linex, liney, _ = copy.pop(0)
            for temx, temy, _ in points:
                pygame.draw.line(sur, WHITE, (linex, liney-2), (temx, temy-2), 1)
                pygame.draw.line(sur, GRAY, (linex, liney), (temx, temy), 3)
                pygame.draw.line(sur, WHITE, (linex, liney+2), (temx, temy+2), 1)
                linex, liney = temx, temy
　　　　  ...
        ...

# 响应事件
for event in pygame.event.get():
    if event.type == QUIT:
        pygame.quit()
        sys.exit()
    # 鼠标长按响应, 连续的点形成刀锋
    elif event.type == MOUSEBUTTONDOWN:
        loose = True
    elif event.type == MOUSEBUTTONUP:
        loose = False
        points.clear()
        sur.blit(back, (0, 0))
    if event.type == MOUSEMOTION and loose:
        x1, y1 = event.pos
        points.append((x1, y1, p_time))

...
...

总结

剩下还有部分功能就不一一描述了, 有兴趣或者有问题可以私信, 代码这里不方便放出来, 因为图片素材实在是太多.