本系列博客介紹以python+pygame庫進行小游戲的開發。有寫的不對之處還望各位海涵。
我們一同在前幾期的博客中已經學到了很多pygame的基本知識了，現在該做個小游戲實戰一下了。
前幾期博客鏈接：
第一篇：初識pygame http://www.cnblogs.com/msxh/p/4966899.html
第二篇：pygame中的IO、數據 http://www.cnblogs.com/msxh/p/4973003.html
第三篇：pygame事件與設備輪詢 http://www.cnblogs.com/msxh/p/4979380.html
第四篇：pygame中加載位圖及些常用的數學函數 http://www.cnblogs.com/msxh/p/4990435.html
本次我們要做一個很簡單的小游戲：從天上會隨機的掉下魚，你需要使用鼠標操縱貓去接住魚，丟失一條魚損失一條命，一共有10條命，同時還要避免接到炸彈。接住魚會有積分。
游戲效果圖如下：
游戲下載地址：http://pan.baidu.com/s/1qWA4xZ2
源代碼下載地址：http://pan.baidu.com/s/1i3is15j
還是先上一下完整的源代碼吧：
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("嗷大喵愛吃魚！") 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
關於位圖的加載，設備輪詢等等的內容我們就不在這里贅述了，不熟悉的可以查看前幾期的博客。
為了讓游戲更有趣味性，我們設置一下魚的速度是可以變的。當得到的分數在不同區間的時候，會有不同的速度。（速度會越來快。）詳見代碼83-107行。
為了判斷玩家是否錯過魚或者接到魚，我們還需要寫一個簡單的碰撞檢測函數：
#如果錯過魚的話，就重置魚的位置，給它一個隨機的x值，然后生命值 減一 if bomb_y > 500: bomb_x = random.randint(0, 500) bomb_y = -50 lives -= 1 if lives == 0: game_over = True #簡單碰撞檢測函數，查看是否接住魚 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
同理炸彈的檢測和這個是類似的。
if bomb_y > 500: bomb_x = random.randint(0, 500) bomb_y = -50 lives -= 1 if lives == 0: game_over = True
為了控制貓的坐標不超出屏幕范圍，我們加入了如下的代碼：
pos_x = mouse_x if pos_x < 0: pos_x = 0 elif pos_x > 510: pos_x = 500
貓在接到炸彈。或者生命值小於5的時候，會變成哭臉，因此我們還需要加載一張哭臉的位圖，然后在程序中添加一些相應的邏輯代碼：
#加載貓的哭臉位圖 cat2=pygame.image.load("aodamiao_3.png") #當接到炸彈的時候，貓變成哭臉 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 #當貓的生命值小於5時，貓變成哭臉 if lives<5: pic=cat2
最后我們可以使用py2exe將其打包成exe並發布。py2exe打包流程請看這里：http://www.cnblogs.com/msxh/p/4886628.html
通過這個十分簡陋的游戲，我們大概回顧了一下之前學到的知識。（游戲相當的簡陋了，連聲音都沒有。。。）
下個博客我們將深入學習pygame中的Sprite（精靈）模塊，並且了解如何加載動畫和Sprite中的碰撞檢測函數。