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Python游戏开发教程五：大喵爱吃鱼小游戏开发实例

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本文目标

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

源码分享

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# -*-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：

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#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

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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：

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     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：

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#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PyInstaller将其打包成exe并发布。

PyInstaller打包流程请看这里：http://code.py40.com/38.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。

未经允许不得转载：Python在线学习 » Python游戏开发教程五：大喵爱吃鱼小游戏开发实例

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