很常见的游戏之一，实现原理并不复杂，并且参考了几个相关的代码。这边主要还是以学习编程语言和学习编程思路为重点记录一下吧。最近时间有点吃紧，只能匆忙记录一下。用pygame做的大鱼吃小鱼的游戏截图如下：（有些鱼的图片背景没有做透明处理，这块确实需要点美工时间，只能先凑合了）。
下面的图片是网上随便找的素材，这里用于切换主角的图片有三张，其他则是其他小鱼和boss鱼。我们控制的主人鱼的大小范围来决定加载不同的图片。以上准备的素材，其中一些背景色没有时间做处理，所以游戏中会有难看的背景色，只能凑合着用。。。
一、玩法及逻辑相关：
控制你的鱼，有个初始大小，当碰到比你小的鱼的时候，你会吃掉它，并且会变大；遇到比你大的鱼，受到一点伤害，当总生命值为0时，失败游戏结束；当你控制的鱼大小增大最大时，游戏获胜。当鱼受到伤害时，有一段时间是无敌时间，且会闪烁。下面是主要的逻辑处理代码
1FlashIsOn=round(time.time(),1)*10%2==12ifnotgameOverModeandnot(invulnerableModeandflashIsOn):3playerobj['rect']=pygame.Rect((playerobj['x']-camerax,playerobj['y']4-cameray,playerobj['size'],playerobj['size']))5SCREEN.blit(playerobj['surface'],playerobj['rect'])6foreventinpygame.event.get():7ifevent.type ==QUIT:8pygame.quit()9sys.exit()10elifevent.type==KEYDOWN:11ifevent.keyin(K_UP,K_w):12moveDown =False13moveUp =True14elifevent.keyin(K_DOWN,K_s):15moveDown =True16moveUp =False17elifevent.keyin(K_LEFT,K_a):18moveRight =False19moveLeft=True20ifplayerobj['facing']==RIGHT:21playerobj['surface']=playersurfaceset(playerobj['size'], True)22playerobj['facing']=LEFT23elifevent.keyin(K_RIGHT,K_d):24moveRight =True25moveLeft=False26ifplayerobj['facing']==LEFT:27playerobj['surface']=playersurfaceset(playerobj['size'], False)28playerobj['facing']=RIGHT29elifwinModeandevent.key ==K_r:30return31elifevent.type==KEYUP:32ifevent.keyin(K_LEFT,K_a):33moveLeft=False34elifevent.keyin(K_RIGHT,K_d):35moveRight=False36elifevent.keyin(K_UP,K_w):37moveRight=False38elifevent.keyin(K_DOWN,K_s):39moveRight=False40ifnotgameOverMode:41ifmoveLeft:42playerobj['x']-=MOVESPEED43ifmoveRight:44playerobj['x']+=MOVESPEED45ifmoveUp:46playerobj['y']-=MOVESPEED47ifmoveDown:48playerobj['y']+=MOVESPEED49foriinrange(len(fishobjs)-1,-1,-1):50obj=fishobjs[i]51if'rect'inobjandplayerobj['rect'].colliderect(obj['rect']):52ifobj['width']*obj['height']<=playerobj['size']**2:53playerobj['size']+=int((obj['width']*obj['height'])**0.2)54delfishobjs[i]55ifplayerobj['face']==LEFT:56playerobj['surface']=playersurfaceset(playerobj['size'],True)57ifplayerobj['face']==RIGHT:58playerobj['surface']=playersurfaceset(playerobj['size'],False)59ifplayerobj['size']>WINSIZE:60winMode=True61elifnotinvulnerableMode:62invulnerableMode=True63invulnerableStartTime=time.time()64playerobj['health']-=165ifplayerobj['health']==0:66gameOverMode =True67gameOverStartTime=time.time()
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主人公的控制类似一般的处理，这边用flashIsonl来生成时间差（偶数值时间为真）playersurfaceset（）函数决定主人公的图片类型。
二、敌方鱼的生成处理
上篇做的敌方的处理会在当前视口随即出现，这个突兀感太强，鱼的出现也不能随机显示在当前视口，应该由摄像机视角之外生成才符合常理。并且当鱼离摄像区域太远的距离，需要删除掉鱼对象。
1foriinrange(len(fishobjs)-1,-1,-1):2ifisOutsideArea(camerax,cameray,fishobjs[i]):3delfishobjs[i]4whilelen(fishobjs)<10:5fishobjs.append(makeNewfish(camerax,cameray))
1defmakeNewfish(camerax,cameray):2sq={}3generalSize=random.randint(5,25)4multiplier = random.randint(1,3)5sq['width'] = (generalSize +random.randint(0,10))*multiplier6sq['height']= (generalSize +random.randint(0,10))*multiplier7sq['x'],sq['y']=getRandomoffCameraPos(camerax,cameray,sq['width'],sq['height'])8sq['movx'] =getRandomVelcocity()9sq['movy'] =getRandomVelcocity()10ifsq['movx']<0:11sq['surface']=surfaceset(sq['width'],sq['height'],True)12else:13sq['surface']=surfaceset(sq['width'],sq['height'],False)14returnsq
三、跟随视角的处理
这个主要是跟随主人公视角的问题，计算出主人公的中心点距离摄像机中心点的距离，当距离偏大的时候，需要移动摄像机的位置，具体处理代码如下：
1playerCenterx=playerobj['x']+int(playerobj['size']/2)2playerCentery=playerobj['y']+int(playerobj['size']/2)3if(camerax+HALF_WINWIDTH)-playerCenterx>CAMERASLACK:4camerax=playerCenterx+CAMERASLACK-HALF_WINWIDTH5elifplayerCenterx-(camerax+HALF_WINWIDTH)>CAMERASLACK:6camerax=playerCenterx-CAMERASLACK-HALF_WINWIDTH7if(cameray+HALF_WINHEIGHT)-playerCentery>CAMERASLACK:8cameray=playerCentery+CAMERASLACK-HALF_WINHEIGHT9elifplayerCentery-(camerax+HALF_WINHEIGHT)>CAMERASLACK:10cameray=playerCentery-CAMERASLACK-HALF_WINHEIGHT
大部分应该介绍的应该就这些了，只能说游戏这块水比较深，只能浅尝辄止一番，python做游戏只能简单玩玩，这块不是他的优势。有人感兴趣的话可以研究它，推荐一本不错的书《Making games with python $ pygame》,哎 只能说有巨人的肩膀上站真好。
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附全部源代码如下，比较粗陋，建议以书上源码学习为主：
importpygame,sys,time,randomfrompygame.localsimport*WINWIDTH=640WINHEIGHT=480CAMERASLACK=70lfish_img=[]
FISHSIZE=8PLAYERSIZE=3SCREEN=None
rfish_img=[]
lplayer_img=[]
rplayer_img=[]
backgroundimg=None
rboss_img=None
lboss_img=None
FPS=30WHITE=[255,255,255]
MAXHEALTH=3MINSPEED=3MAXSPEED=9MOVESPEED=7HALF_WINWIDTH=int(WINWIDTH/2)
HALF_WINHEIGHT=int(WINHEIGHT/2)
WINSIZE=300defmain():globalFPSCLOCK,SCREEN,lfish_img,rfish_img,lplayer_img,rplayer_img,BASICFONT\
,rboss_img,lboss_img,backgroundimg
pygame.init()
FPSCLOCK=pygame.time.Clock()
SCREEN=pygame.display.set_mode((WINWIDTH,WINHEIGHT))
pygame.display.set_caption("fish eat fish")
BASICFONT=pygame.font.Font("freesansbold.ttf",32)foriinrange(FISHSIZE):
fishimg=pygame.image.load("Fish%s.bmp"%i)
fishimg.set_colorkey(WHITE)
lfish_img.append(fishimg)
rfishimg=pygame.transform.flip(fishimg,True,False)
rfish_img.append(rfishimg)foriinrange(PLAYERSIZE):
playerimg=pygame.image.load("player%s.png"%i)
playerimg.set_colorkey(WHITE)
lplayer_img.append(playerimg)
rplayerimg=pygame.transform.flip(playerimg,True,False)
rplayerimg.set_colorkey(WHITE)
rplayer_img.append(rplayerimg)
bossimg=pygame.image.load("boss.png")#bossimg.set_colorkey([0,0,0])#SCREEN.blit(bossimg,(0,0))lboss_img=bossimg
rbossimg=pygame.transform.flip(bossimg,True,False)
rboss_img=rbossimg
backgroundimg=pygame.image.load("background.jpg")whileTrue:
runGame()defrunGame():
invulnerableMode=False
invulnerableStartTime=0
gameOverMode=False
gameOverStartTime=0
winMode=False
gameOverSurf=BASICFONT.render('Game Over',True,WHITE)
gameOverRect=gameOverSurf.get_rect()
gameOverRect.center=(HALF_WINWIDTH,HALF_WINHEIGHT)
winSurf=BASICFONT.render('you succeed',True,WHITE)
winRect=winSurf.get_rect()
winRect.center=(HALF_WINWIDTH,HALF_WINHEIGHT)
winSurf2=BASICFONT.render('you succeed',True,WHITE)
winRect2=winSurf2.get_rect()
winRect2.center=(HALF_WINWIDTH,HALF_WINHEIGHT+30)
camerax=0
cameray=0
LEFT=0
RIGHT=1fishobjs=[]
playerobj={'surface':pygame.transform.scale(lplayer_img[0],(25,25)),'size':25,'facing':LEFT,'x':HALF_WINWIDTH,'y':HALF_WINHEIGHT,'health':MAXHEALTH}
moveLeft=False
moveRight=False
moveUp=False
moveDown=FalsewhileTrue:ifinvulnerableModeandtime.time() - invulnerableStartTime>2:
invulnerableMode=Falseforsobjinfishobjs:
sobj['x']+=sobj['movx']
sobj['y']+=sobj['movy']foriinrange(len(fishobjs)-1,-1,-1):ifisOutsideArea(camerax,cameray,fishobjs[i]):delfishobjs[i]whilelen(fishobjs)<5:
fishobjs.append(makeNewfish(camerax,cameray))
playerCenterx=playerobj['x']+int(playerobj['size']/2)
playerCentery=playerobj['y']+int(playerobj['size']/2)if(camerax+HALF_WINWIDTH)-playerCenterx>CAMERASLACK:
camerax=playerCenterx+CAMERASLACK-HALF_WINWIDTHelifplayerCenterx-(camerax+HALF_WINWIDTH)>CAMERASLACK:
camerax=playerCenterx-CAMERASLACK-HALF_WINWIDTHif(cameray+HALF_WINHEIGHT)-playerCentery>CAMERASLACK:
cameray=playerCentery+CAMERASLACK-HALF_WINHEIGHTelifplayerCentery-(camerax+HALF_WINHEIGHT)>CAMERASLACK:
cameray=playerCentery-CAMERASLACK-HALF_WINHEIGHT
backrect=pygame.Rect((camerax-WINWIDTH,cameray-WINHEIGHT,WINWIDTH*3,WINHEIGHT*3))
newbackgroundimg=pygame.transform.scale(backgroundimg,(WINWIDTH*3,WINHEIGHT*3))
SCREEN.blit(newbackgroundimg,backrect)forobjinfishobjs:
obj['rect']=pygame.Rect((obj['x']-camerax,obj['y']-cameray,obj['width']
,obj['height']))
SCREEN.blit(obj['surface'],obj['rect'])
flashIsOn=round(time.time(),1)*10%2==1ifnotgameOverModeandnot(invulnerableModeandflashIsOn):
playerobj['rect']=pygame.Rect((playerobj['x']-camerax,playerobj['y']-cameray,playerobj['size'],playerobj['size']))
SCREEN.blit(playerobj['surface'],playerobj['rect'])foreventinpygame.event.get():ifevent.type ==QUIT:
pygame.quit()
sys.exit()elifevent.type==KEYDOWN:ifevent.keyin(K_UP,K_w):
moveDown=False
moveUp=Trueelifevent.keyin(K_DOWN,K_s):
moveDown=True
moveUp=Falseelifevent.keyin(K_LEFT,K_a):
moveRight=False
moveLeft=Trueifplayerobj['facing']==RIGHT:
playerobj['surface']=playersurfaceset(playerobj['size'], True)
playerobj['facing']=LEFTelifevent.keyin(K_RIGHT,K_d):
moveRight=True
moveLeft=Falseifplayerobj['facing']==LEFT:
playerobj['surface']=playersurfaceset(playerobj['size'], False)
playerobj['facing']=RIGHTelifwinModeandevent.key ==K_r:returnelifevent.type==KEYUP:ifevent.keyin(K_LEFT,K_a):
moveLeft=Falseelifevent.keyin(K_RIGHT,K_d):
moveRight=Falseelifevent.keyin(K_UP,K_w):
moveRight=Falseelifevent.keyin(K_DOWN,K_s):
moveRight=FalseifnotgameOverMode:ifmoveLeft:
playerobj['x']-=MOVESPEEDifmoveRight:
playerobj['x']+=MOVESPEEDifmoveUp:
playerobj['y']-=MOVESPEEDifmoveDown:
playerobj['y']+=MOVESPEEDforiinrange(len(fishobjs)-1,-1,-1):
obj=fishobjs[i]if'rect'inobjandplayerobj['rect'].colliderect(obj['rect']):ifobj['width']*obj['height']<=playerobj['size']**2:
playerobj['size']+=int((obj['width']*obj['height'])**0.2)delfishobjs[i]ifplayerobj['face']==LEFT:
playerobj['surface']=playersurfaceset(playerobj['size'],True)ifplayerobj['face']==RIGHT:
playerobj['surface']=playersurfaceset(playerobj['size'],False)ifplayerobj['size']>WINSIZE:
winMode=TrueelifnotinvulnerableMode:
invulnerableMode=True
invulnerableStartTime=time.time()
playerobj['health']-=1ifplayerobj['health']==0:
gameOverMode=True
gameOverStartTime=time.time()ifwinMode:
SCREEN.blit(winSurf,winRect)
SCREEN.blit(winSurf2,winRect2)
pygame.display.update()
FPSCLOCK.tick(FPS)defisOutsideArea(camerax,cameray,fishobj):
boundsLeftEdge=camerax-WINWIDTH
boundsTopEdge=cameray-WINHEIGHT
boundsRect=pygame.Rect(boundsLeftEdge,boundsTopEdge,WINWIDTH*3,WINHEIGHT*3)
objRect=pygame.Rect(fishobj['x'],fishobj['y'],fishobj['width'],fishobj['height'])returnnotboundsRect.colliderect(objRect)defmakeNewfish(camerax,cameray):
sq={}
generalSize=random.randint(5,25)
multiplier= random.randint(1,3)
sq['width'] = (generalSize +random.randint(0,10))*multiplier
sq['height']= (generalSize +random.randint(0,10))*multiplier
sq['x'],sq['y']=getRandomoffCameraPos(camerax,cameray,sq['width'],sq['height'])
sq['movx'] =getRandomVelcocity()
sq['movy'] =getRandomVelcocity()ifsq['movx']<0:
sq['surface']=surfaceset(sq['width'],sq['height'],True)else:
sq['surface']=surfaceset(sq['width'],sq['height'],False)returnsqdefplayersurfaceset(size,Face):
surface=Noneifsize<100:ifFace ==True:
surface=pygame.transform.scale(lplayer_img[0],(size,size))else:
surface=pygame.transform.scale(rplayer_img[0],(size,size))elifsize<200andsize>=100:ifFace ==True:
surface= pygame.transform.scale(lplayer_img[1],(size,size))else:
surface= pygame.transform.scale(rplayer_img[1],(size,size))else:ifFace ==True:
surface= pygame.transform.scale(lplayer_img[2],(size,size))else:
surface= pygame.transform.scale(rplayer_img[2],(size,size))returnsurfacedefsurfaceset(width,height,Face):
surface=Noneifwidth*height>200*200:ifFace ==True:
surface=pygame.transform.scale(lboss_img,(width,height))else:
surface=pygame.transform.scale(rboss_img,(width,height))else:
index= int((width*height)%(FISHSIZE-1))ifFace ==True:
surface=pygame.transform.scale(lfish_img[index],(width,height))else:
surface=pygame.transform.scale(rfish_img[index],(width,height))returnsurfacedefgetRandomVelcocity():
speed=random.randint(MINSPEED,MAXSPEED)ifrandom.randint(0,1):returnspeedelse:return-speeddefgetRandomoffCameraPos(camerax,cameray,objwidth,objheight):
cameraRect=pygame.Rect(camerax,cameray,WINWIDTH,WINHEIGHT)whileTrue:
x=random.randint(camerax-WINWIDTH,camerax+2*(WINWIDTH))
y=random.randint(camerax-WINHEIGHT,camerax+2*(WINHEIGHT))
objrect=pygame.Rect(x,y,objwidth,objheight)ifnotobjrect.colliderect(cameraRect):returnx,yif__name__=='__main__':
main()
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ps:最近越来越懒了，不知道当初订的每周至少写一篇随笔的目标能否坚持下去。另外鄙视下12306上刷票的黄牛，刷了一天没买到票，哎 不说了都是泪。