通常游戏中的角色都有所谓的生命值，而且头顶上会有一个血条显示。生命值无非就是一个属性而已，很容易在Player.py类中增加，头顶上的血条其实就是绘制二个矩形，叠加在一起。

以上节的Player.py为例：

import pygame

# 主角

class Player(object):

    def __init__(self, x, y, width, height, img_base_path):

        self.x = x

        self.y = y

        self.width = width

        self.height = height

        self.speed = 5

        self.left = False

        self.right = True

        self.isJump = False

        self.walkCount = 0

        self.t = 10

        self.speed = 5

        # 生命值

        self.life = 10

        self.char = pygame.image.load(img_base_path + 'standing.png')

        self.walkRight = [pygame.image.load(img_base_path + 'actor/R1.png'),

                          pygame.image.load(img_base_path + 'actor/R2.png'),

                          pygame.image.load(img_base_path + 'actor/R3.png'),

                          pygame.image.load(img_base_path + 'actor/R4.png'),

                          pygame.image.load(img_base_path + 'actor/R5.png'),

                          pygame.image.load(img_base_path + 'actor/R6.png'),

                          pygame.image.load(img_base_path + 'actor/R7.png'),

                          pygame.image.load(img_base_path + 'actor/R8.png'),

                          pygame.image.load(img_base_path + 'actor/R9.png')]

        self.walkLeft = [pygame.image.load(img_base_path + 'actor/L1.png'),

                         pygame.image.load(img_base_path + 'actor/L2.png'),

                         pygame.image.load(img_base_path + 'actor/L3.png'),

                         pygame.image.load(img_base_path + 'actor/L4.png'),

                         pygame.image.load(img_base_path + 'actor/L5.png'),

                         pygame.image.load(img_base_path + 'actor/L6.png'),

                         pygame.image.load(img_base_path + 'actor/L7.png'),

                         pygame.image.load(img_base_path + 'actor/L8.png'),

                         pygame.image.load(img_base_path + 'actor/L9.png')]

        self.hit_box = (self.x + 17, self.y + 11, 29, 52)

    def draw(self, win):

        if self.walkCount >= 9:

            self.walkCount = 0

        if self.left:

            win.blit(self.walkLeft[self.walkCount % 9], (self.x, self.y))

            self.walkCount += 1

        elif self.right:

            win.blit(self.walkRight[self.walkCount % 9], (self.x, self.y))

            self.walkCount += 1

        else:

            win.blit(self.char, (self.x, self.y))

        self.hit_box = (self.x + 17, self.y + 11, 29, 52)

        # 血条(头顶的绿色背景矩形）

        pygame.draw.rect(win, (0, 128, 0), (self.hit_box[0], self.hit_box[1] - 10, 40, 8))

        # 血条(头顶的红色背景矩形，即：消耗的血）

        pygame.draw.rect(win, (255, 0, 0),

                         (self.hit_box[0] + self.life * 4, self.hit_box[1] - 10, 40 - self.life * 4, 8))

敌人类Enemy.py也是类似处理：　

import pygame

class Enemy(object):

    def __init__(self, x, y, width, height, end, img_base_path):

        self.x = x

        self.y = y

        self.width = width

        self.height = height

        self.path = [x, end]

        self.walkCount = 0

        self.vel = 3

        self.walkRight = [pygame.image.load(img_base_path + 'enemy/R1E.png'),

                          pygame.image.load(img_base_path + 'enemy/R2E.png'),

                          pygame.image.load(img_base_path + 'enemy/R3E.png'),

                          pygame.image.load(img_base_path + 'enemy/R4E.png'),

                          pygame.image.load(img_base_path + 'enemy/R5E.png'),

                          pygame.image.load(img_base_path + 'enemy/R6E.png'),

                          pygame.image.load(img_base_path + 'enemy/R7E.png'),

                          pygame.image.load(img_base_path + 'enemy/R8E.png'),

                          pygame.image.load(img_base_path + 'enemy/R9E.png'),

                          pygame.image.load(img_base_path + 'enemy/R10E.png'),

                          pygame.image.load(img_base_path + 'enemy/R11E.png')]

        self.walkLeft = [pygame.image.load(img_base_path + 'enemy/L1E.png'),

                         pygame.image.load(img_base_path + 'enemy/L2E.png'),

                         pygame.image.load(img_base_path + 'enemy/L3E.png'),

                         pygame.image.load(img_base_path + 'enemy/L4E.png'),

                         pygame.image.load(img_base_path + 'enemy/L5E.png'),

                         pygame.image.load(img_base_path + 'enemy/L6E.png'),

                         pygame.image.load(img_base_path + 'enemy/L7E.png'),

                         pygame.image.load(img_base_path + 'enemy/L8E.png'),

                         pygame.image.load(img_base_path + 'enemy/L9E.png'),

                         pygame.image.load(img_base_path + 'enemy/L10E.png'),

                         pygame.image.load(img_base_path + 'enemy/L11E.png')]

        self.hit_box = (self.x + 17, self.y + 2, 31, 57)

        #生命值

        self.life = 10

    def draw(self, win):

        if self.life > 0:

            self.move()

            if self.walkCount >= 11:

                self.walkCount = 0

            if self.vel > 0:

                win.blit(self.walkRight[self.walkCount % 11], (self.x, self.y))

                self.walkCount += 1

            else:

                win.blit(self.walkLeft[self.walkCount % 11], (self.x, self.y))

                self.walkCount += 1

            self.hit_box = (self.x + 17, self.y + 2, 31, 57)

            # 血条

            pygame.draw.rect(win, (0, 128, 0), (self.hit_box[0], self.hit_box[1] - 12, 40, 8))

            pygame.draw.rect(win, (255, 0, 0),

                             (self.hit_box[0] + self.life * 4, self.hit_box[1] - 12, 40 - self.life * 4, 8))

    def move(self):

        if self.vel > 0:

            if self.x < self.path[1] + self.vel:

                self.x += self.vel

            else:

                self.vel = self.vel * -1

                self.x += self.vel

                self.walkCount = 0

        else:

            if self.x > self.path[0] - self.vel:

                self.x += self.vel

            else:

                self.vel = self.vel * -1

                self.x += self.vel

                self.walkCount = 0

然后主类里，碰撞检测到后，将各自的生命值减1：

import os

from bullet import *

from player import *

from enemy import *

WIN_WIDTH, WIN_HEIGHT = 500, 500

pygame.init()

win = pygame.display.set_mode((WIN_WIDTH, WIN_HEIGHT))

pygame.display.set_caption("first game")

img_base_path = os.getcwd() + '/img/'

bg = pygame.image.load(img_base_path + 'bg.jpg')

clock = pygame.time.Clock()

def redraw_game_window():

    win.blit(bg, (0, 0))

    you_win = font.render('YOU WIN! ', 1, (0, 0, 255))

    you_lost = font.render('YOU LOST! ', 1, (255, 0, 0))

    # 敌人消灭，结束

    if enemy.life <= 0:

        win.blit(you_win, (200, 230))

        pygame.display.update()

        return

    # 主角被打死，结束

    if man.life <= 0:

        win.blit(you_lost, (200, 230))

        pygame.display.update()

        return

    # 主角的生命值

    life_text = font.render('Life: ' + str(man.life), 1, (0, 0, 0))

    win.blit(life_text, (20, 10))

    # 显示击中后的得分

    text = font.render('Score: ' + str(score), 1, (0, 0, 0))

    win.blit(text, (370, 10))

    man.draw(win)

    enemy.draw(win)

    for bullet in bullets:

        bullet.draw(win)

    pygame.display.update()

def collision_check(a, b):

    temp1 = (b.x <= a.x + a.width <= b.x + b.width)

    temp2 = (b.y <= a.y + a.height <= b.y + b.height)

    return temp1 and temp2

# main

font = pygame.font.SysFont('comicsans', 30, True)

man = Player(200, 410, 64, 64, img_base_path)

enemy = Enemy(100, 414, 64, 64, 400, img_base_path)

run = True

score = 0

bullets = []

while run:

    clock.tick(27)

    for event in pygame.event.get():

        if event.type == pygame.QUIT:

            run = False

    # 如果被敌人打到了，主角生命值-1

    if collision_check(man, enemy) or collision_check(enemy, man):

        man.life -= 1

        # 自动跳跃，防止血降得太快

        man.isJump = True

    for b in bullets:

        # 碰撞检测

        if collision_check(b, enemy) or collision_check(enemy, b):

            score += 1

            enemy.life -= 1

            bullets.pop(bullets.index(b))

        if WIN_WIDTH > b.x > 0:

            b.x += b.vel

        else:

            bullets.pop(bullets.index(b))

    keys = pygame.key.get_pressed()

    if keys[pygame.K_SPACE]:

        if man.left:

            direction = -1

        else:

            direction = 1

        if len(bullets) < 5:

            bullets.append(Bullet(man.x + man.width // 2, man.y + man.height // 2, direction, img_base_path))

    if keys[pygame.K_LEFT] and man.x > 0:

        man.x -= man.speed

        man.left = True

        man.right = False

    elif keys[pygame.K_RIGHT] and man.x < win.get_size()[0] - man.width:

        man.x += man.speed

        man.left = False

        man.right = True

    else:

        man.walkCount = 0

    if not man.isJump:

        if keys[pygame.K_UP]:

            man.isJump = True

            man.walkCount = 0

    else:

        if man.t >= -10:

            a = 1

            if man.t < 0:

                a = -1

            man.y -= 0.5 * a * (man.t ** 2)

            man.t -= 1

        else:

            man.isJump = False

            man.t = 10

    redraw_game_window()

pygame.quit()

源码下载： https://github.com/yjmyzz/pygame_tutorial

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