本系列博客介绍以python+pygame库进行小游戏的开发。有写的不对之处还望各位海涵。
我们一同在前几期的博客中已经学到了很多pygame的基本知识了，现在该做个小游戏实战一下了。
前几期博客链接：
第一篇：初识pygame http://www.cnblogs.com/msxh/p/4966899.html
第二篇：pygame中的IO、数据 http://www.cnblogs.com/msxh/p/4973003.html
第三篇：pygame事件与设备轮询 http://www.cnblogs.com/msxh/p/4979380.html
第四篇：pygame中加载位图及些常用的数学函数 http://www.cnblogs.com/msxh/p/4990435.html
本次我们要做一个很简单的小游戏：从天上会随机的掉下鱼，你需要使用鼠标操纵猫去接住鱼，丢失一条鱼损失一条命，一共有10条命，同时还要避免接到炸弹。接住鱼会有积分。
游戏效果图如下：
游戏下载地址：http://pan.baidu.com/s/1qWA4xZ2
源代码下载地址：http://pan.baidu.com/s/1i3is15j
还是先上一下完整的源代码吧：
1 # -*-coding:utf-8-*- s = ' 2 #AoDaMiao Like Eating Fish 3 import sys, random, time, pygame 4 from pygame.locals import * 5 6 def print_text(font, x, y, text, color=(255,255,255)): 7 imgText = font.render(text, True, color) 8 screen.blit(imgText, (x,y)) 9 10 11 #main program begins 12 pygame.init() 13 screen = pygame.display.set_mode((600,500)) 14 pygame.display.set_caption("嗷大喵爱吃鱼！") 15 font1 = pygame.font.Font(None, 24) 16 font2 = pygame.font.Font(None, 18) 17 font3 = pygame.font.Font(None, 34) 18 pygame.mouse.set_visible(False) 19 white = 255,255,255 20 red = 220, 50, 50 21 yellow = 230,230,50 22 black = 0,0,0 23 cat=pygame.image.load("aodamiao_2.png") 24 width,height=cat.get_size() 25 pic=pygame.transform.scale(cat,(width,height)) 26 fish=pygame.image.load("fish.png") 27 width,height=fish.get_size() 28 fish=pygame.transform.smoothscale(fish,(width//3,height//3)) 29 init=pygame.image.load("init.png") 30 lives = 10 31 score = 0 32 clock_start = 0 33 game_over = 1 34 mouse_x = mouse_y = 0 35 Round =1 36 mine=0 37 mine_png=pygame.image.load("mine.png") 38 cat2=pygame.image.load("aodamiao_3.png") 39 flag=0 40 41 pos_x = 300 42 pos_y = 410-40 43 44 bomb_x = random.randint(0,500) 45 mine_x=random.randint(0,500) 46 bomb_y = -50 47 vel_y = 0.4 48 vel_yy=0.6 49 mine_y=-100 50 51 #repeating loop 52 while True: 53 for event in pygame.event.get(): 54 if event.type == pygame.QUIT: 55 #sys.exit() 56 pygame.quit() 57 exit() 58 elif event.type == MOUSEMOTION: 59 mouse_x,mouse_y = event.pos 60 move_x,move_y = event.rel 61 elif event.type == MOUSEBUTTONUP: 62 if game_over: 63 game_over = False 64 lives = 10 65 score = 0 66 Round =1 67 vel_y=0.4 68 mine=0 69 flag=0 70 pic=cat 71 bomb_y = -50 72 73 keys = pygame.key.get_pressed() 74 if keys[K_ESCAPE]: 75 sys.exit() 76 77 screen.fill((0,0,100)) 78 79 if game_over: 80 screen.blit(init,(60, 60)) 81 print_text(font3, 200, 400,"Clicked To Play!") 82 print_text(font2, 310, 480,"Copyright@2015 developed by xiaoxiami") 83 else: 84 #Round setting 85 if score >300 and score <600: 86 Round=2 87 elif score >600 and score <900: 88 Round =3 89 elif score >900 and score <1200: 90 Round=4 91 elif score >1200 and score <1500: 92 Round =5 93 elif score >=1500: 94 Round =6 95 #draw the Round 96 print_text(font1, 280, 0, "Round: " + str(Round)) 97 #speed setting 98 if Round ==1: 99 vel_y=0.4 100 elif Round ==2: 101 vel_y=0.6 102 elif Round ==3: 103 vel_y=0.8 104 elif Round ==4: 105 vel_y=1.0 106 elif Round ==5: 107 vel_y=1.2 108 #mine number setting 109 #mine=random.randint(1,9) 110 #move the fish 111 bomb_y += vel_y 112 mine_y+=vel_yy 113 114 #has the player missed the fish? 115 if bomb_y > 500: 116 bomb_x = random.randint(0, 500) 117 bomb_y = -50 118 lives -= 1 119 if lives == 0: 120 game_over = True 121 #see if player has caught the fish 122 elif bomb_y > pos_y: 123 if bomb_x > pos_x-10 and bomb_x < pos_x + 70: 124 score += 10 125 bomb_x = random.randint(0, 500) 126 bomb_y = -50 127 if Round >2: 128 #has the player missed the mine? 129 if mine_y > 500: 130 mine_x = random.randint(0, 500) 131 mine_y = -50 132 #see if player has caught the mine 133 elif mine_y > pos_y: 134 if mine_x > pos_x and mine_x < pos_x + 40: 135 mine_x = random.randint(0, 500) 136 mine_y = -50 137 lives-=1 138 pic=cat2 139 if lives == 0: 140 game_over = True 141 142 #draw the fish 143 screen.blit(fish,(bomb_x,int(bomb_y))) 144 #draw the mine 145 if Round >2: 146 screen.blit(mine_png,(mine_x,int(mine_y))) 147 148 #set cat position 149 pos_x = mouse_x 150 if pos_x < 0: 151 pos_x = 0 152 elif pos_x > 510: 153 pos_x = 500 154 #draw cat 155 if lives<5: 156 pic=cat2 157 screen.blit(pic,(pos_x,pos_y)) 158 159 #print # of lives 160 print_text(font1, 0, 0, "LIVES: " + str(lives)) 161 162 #print score 163 print_text(font1, 500, 0, "SCORE: " + str(score)) 164 165 pygame.display.update() 166 167
关于位图的加载，设备轮询等等的内容我们就不在这里赘述了，不熟悉的可以查看前几期的博客。
为了让游戏更有趣味性，我们设置一下鱼的速度是可以变的。当得到的分数在不同区间的时候，会有不同的速度。（速度会越来快。）详见代码83-107行。
为了判断玩家是否错过鱼或者接到鱼，我们还需要写一个简单的碰撞检测函数：
#如果错过鱼的话，就重置鱼的位置，给它一个随机的x值，然后生命值 减一 if bomb_y > 500: bomb_x = random.randint(0, 500) bomb_y = -50 lives -= 1 if lives == 0: game_over = True #简单碰撞检测函数，查看是否接住鱼 elif bomb_y > pos_y: if bomb_x > pos_x-10 and bomb_x < pos_x + 70: score += 10 bomb_x = random.randint(0, 500) bomb_y = -50
同理炸弹的检测和这个是类似的。
if bomb_y > 500: bomb_x = random.randint(0, 500) bomb_y = -50 lives -= 1 if lives == 0: game_over = True
为了控制猫的坐标不超出屏幕范围，我们加入了如下的代码：
pos_x = mouse_x if pos_x < 0: pos_x = 0 elif pos_x > 510: pos_x = 500
猫在接到炸弹。或者生命值小于5的时候，会变成哭脸，因此我们还需要加载一张哭脸的位图，然后在程序中添加一些相应的逻辑代码：
#加载猫的哭脸位图 cat2=pygame.image.load("aodamiao_3.png") #当接到炸弹的时候，猫变成哭脸 elif mine_y > pos_y: if mine_x > pos_x and mine_x < pos_x + 40: mine_x = random.randint(0, 500) mine_y = -50 lives-=1 pic=cat2 if lives == 0: game_over = True #当猫的生命值小于5时，猫变成哭脸 if lives<5: pic=cat2
最后我们可以使用py2exe将其打包成exe并发布。py2exe打包流程请看这里：http://www.cnblogs.com/msxh/p/4886628.html
通过这个十分简陋的游戏，我们大概回顾了一下之前学到的知识。（游戏相当的简陋了，连声音都没有。。。）
下个博客我们将深入学习pygame中的Sprite（精灵）模块，并且了解如何加载动画和Sprite中的碰撞检测函数。