【python游戏编程之旅】第五篇---嗷大喵爱吃鱼小游戏开发实例

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：

# -*-coding:utf-8-*- s = '
#AoDaMiao Like Eating Fish
import sys, random, time, pygame
from pygame.locals import *

def print_text(font, x, y, text, color=(255,255,255)):
imgText = font.render(text, True, color)
screen.blit(imgText, (x,y))

#main program begins
pygame.init()
screen = pygame.display.set_mode((600,500))
pygame.display.set_caption("嗷大喵爱吃鱼！")
font1 = pygame.font.Font(None, 24)
font2 = pygame.font.Font(None, 18)
font3 = pygame.font.Font(None, 34)
pygame.mouse.set_visible(False)
white = 255,255,255
red = 220, 50, 50
yellow = 230,230,50
black = 0,0,0
cat=pygame.image.load("aodamiao_2.png")
width,height=cat.get_size()
pic=pygame.transform.scale(cat,(width,height))
fish=pygame.image.load("fish.png")
width,height=fish.get_size()
fish=pygame.transform.smoothscale(fish,(width//3,height//3))
init=pygame.image.load("init.png")
lives = 10
score = 0
clock_start = 0
game_over = 1
mouse_x = mouse_y = 0
Round =1
mine=0
mine_png=pygame.image.load("mine.png")
cat2=pygame.image.load("aodamiao_3.png")
flag=0

pos_x = 300
pos_y = 410-40

bomb_x = random.randint(0,500)
mine_x=random.randint(0,500)
bomb_y = -50
vel_y = 0.4
vel_yy=0.6
mine_y=-100

#repeating loop
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
#sys.exit()
pygame.quit()
exit()
elif event.type == MOUSEMOTION:
mouse_x,mouse_y = event.pos
move_x,move_y = event.rel
elif event.type == MOUSEBUTTONUP:
if game_over:
game_over = False
lives = 10
score = 0
Round =1
vel_y=0.4
mine=0
flag=0
pic=cat
bomb_y = -50

keys = pygame.key.get_pressed()
if keys[K_ESCAPE]:
sys.exit()

screen.fill((0,0,100))

if game_over:
screen.blit(init,(60, 60))
print_text(font3, 200, 400,"Clicked To Play!")
print_text(font2, 310, 480,"Copyright@2015 developed by xiaoxiami")
else:
#Round setting
if score >300 and score <600:
Round=2
elif score >600 and score <900:
Round =3
elif score >900 and score <1200:
Round=4
elif score >1200 and score <1500:
Round =5
elif score >=1500:
Round =6
#draw the Round
print_text(font1, 280, 0, "Round: " + str(Round))
#speed setting
if Round ==1:
vel_y=0.4
elif Round ==2:
vel_y=0.6
elif Round ==3:
vel_y=0.8
elif Round ==4:
vel_y=1.0
elif Round ==5:
vel_y=1.2
#mine number setting
#mine=random.randint(1,9)
#move the fish
bomb_y += vel_y
mine_y+=vel_yy

#has the player missed the fish?
if bomb_y > 500:
bomb_x = random.randint(0, 500)
bomb_y = -50
lives -= 1
if lives == 0:
game_over = True
#see if player has caught the fish
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
if Round >2:
#has the player missed the mine?
if mine_y > 500:
mine_x = random.randint(0, 500)
mine_y = -50
#see if player has caught the mine
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

#draw the fish
screen.blit(fish,(bomb_x,int(bomb_y)))
#draw the mine
if Round >2:
screen.blit(mine_png,(mine_x,int(mine_y)))

#set cat position
pos_x = mouse_x
if pos_x < 0:
pos_x = 0
elif pos_x > 510:
pos_x = 500
#draw cat
if lives<5:
pic=cat2
screen.blit(pic,(pos_x,pos_y))

#print # of lives
print_text(font1, 0, 0, "LIVES: " + str(lives))

#print score
print_text(font1, 500, 0, "SCORE: " + str(score))

pygame.display.update()

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。