问为什么在Python上的这个小的(155行)吃豆人游戏运行得这么慢？
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Stack Overflow用户

提问于 2012-04-30 05:57:09

回答 2查看 7.4K关注 0票数 0

我已经尽可能地从主循环中删除了所有内容。我还优化了动态和静态对象的碰撞，大大减少了迭代次数。但在他的机器上，它仍然很慢。我将发布整个文件，以防有人想测试它，但您可以跳转到"while Exit==false:“处的主循环。

import pygame
from pyeuclid import Vector2
from math import sin,cos,pi
from random import random

class Thing:
    def __init__(self,pos):
        self.pos = pos
        things.append(self)
    def update(self): pass
    def draw(self,img): pass
    def collide(self,who): pass

class DynamicThing(Thing):
    def __init__(self,pos):
        Thing.__init__(self,pos)
        self.vel = Vector2(0,0)
        self.lastPos = pos
        self.col = (255,255,0)
        self.r = 12
        dynamic_things.append(self)
    def update(self):
        self.lastPos = self.pos
        self.pos = self.pos + self.vel
    def draw(self,img):
        pygame.draw.circle(img, (0,0,0), [int(n) for n in self.pos], self.r, self.r)
        pygame.draw.circle(img, self.col, [int(n) for n in self.pos], self.r-2, self.r-2)
    def collide(self,obj):
        Thing.collide(self,obj)
        if isinstance(obj,Wall): 
            self.pos = self.lastPos

class Wall(Thing):
    def draw(self,img):
        x,y = self.pos.x, self.pos.y
        pygame.draw.rect(img, (90,90,200), (x-16,y-16,32,32), 0)

class Pacman(DynamicThing):
    def __init__(self):
        DynamicThing.__init__(self,Vector2(32*9+16,32*12+16))
        self.col = (255,255,0)
    def update(self):
        DynamicThing.update(self)
        if (keyPressed[pygame.K_LEFT]): self.vel.x = -1
        if (keyPressed[pygame.K_RIGHT]): self.vel.x = 1
        if (keyPressed[pygame.K_DOWN]): self.vel.y = 1
        if (keyPressed[pygame.K_UP]): self.vel.y = -1
        if (self.vel.x==-1 and not keyPressed[pygame.K_LEFT]): self.vel.x = 0
        if (self.vel.x==1 and not keyPressed[pygame.K_RIGHT]): self.vel.x = 0
        if (self.vel.y==1 and not keyPressed[pygame.K_DOWN]): self.vel.y = 0
        if (self.vel.y==-1 and not keyPressed[pygame.K_UP]): self.vel.y = 0
    def collide(self,obj):
        DynamicThing.collide(self,obj)
        if isinstance(obj,Ghost):
            self.pos = Vector2(32*9+16,32*12+16)

class Ghost(DynamicThing):
    def __init__(self):
        DynamicThing.__init__(self,Vector2(32*9+16,32*10+16))
        self.col = (int(random()*255),int(random()*255),int(random()*255))
        self.vel = Vector2(0,-2)
    def update(self):
        DynamicThing.update(self)
        if random()<0.01:
            self.vel = [Vector2(2,0),Vector2(-2,0),Vector2(0,2),Vector2(0,-2)][int(random()*4)]
    def collide(self,obj):
        DynamicThing.collide(self,obj)
        if isinstance(obj,Wall):
            self.vel = [Vector2(2,0),Vector2(-2,0),Vector2(0,2),Vector2(0,-2)][int(random()*4)]

def thingAtPos(pos):
    tile_pos = Vector2(int(pos.x/32),int(pos.y/32))
    return map[tile_pos.y][tile_pos.x]

# initializate stuff
pygame.init()
clock = pygame.time.Clock()
screen = pygame.display.set_mode([32*19,32*22])
points_in_unit_circle_border = [Vector2(cos(float(a)/8*2*pi),sin(float(a)/8*2*pi)) for a in xrange(8)]
things = []
dynamic_things = []
exit = False

map =  [[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
        [1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1],
        [1,0,1,1,0,1,1,1,0,1,0,1,1,1,0,1,1,0,1],
        [1,0,1,1,0,1,1,1,0,1,0,1,1,1,0,1,1,0,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
        [1,0,1,1,0,1,0,1,1,1,1,1,0,1,0,1,1,0,1],
        [1,0,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,0,1],
        [1,1,1,1,0,1,1,1,0,1,0,1,1,1,0,1,1,1,1],
        [1,1,1,1,0,1,0,0,0,0,0,0,0,1,0,1,1,1,1],
        [1,1,1,1,0,1,0,1,1,0,1,1,0,1,0,1,1,1,1],
        [1,0,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,1],
        [1,1,1,1,0,1,0,1,1,1,1,1,0,1,0,1,1,1,1],
        [1,1,1,1,0,1,0,0,0,0,0,0,0,1,0,1,1,1,1],
        [1,1,1,1,0,1,0,1,1,1,1,1,0,1,0,1,1,1,1],
        [1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,1],
        [1,0,1,1,0,1,1,1,0,1,0,1,1,1,0,1,1,0,1],
        [1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,0,0,1],
        [1,1,0,1,0,1,0,1,1,1,1,1,0,1,0,1,0,1,1],
        [1,0,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,0,1],
        [1,0,1,1,1,1,1,1,0,1,0,1,1,1,1,1,0,0,1],
        [1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
        [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]]


#create pacman, walls, ghosts
pacman = Pacman()
for y in xrange(len(map)):
    for x in xrange(len(map[y])):
        if (map[y][x]==1):
            map[y][x] = Wall(Vector2(x*32+16,y*32+16))
for i in xrange(4):
    Ghost()

while exit==False:
    clock.tick(45)

    screen.fill([255,255,255])
    keyPressed = pygame.key.get_pressed()

    # events
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            exit = True
        if event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE:
            exit = True

    # more ghosts
    if random()<0.001: Ghost()

    # updates e draws
    for thing in things:
        thing.update()
        thing.draw(screen)

    # collisions
    for A in dynamic_things:
        #dynamic vs dynamic
        for B in dynamic_things:
            if A!=B and abs(A.pos-B.pos)<(A.r+B.r):
                A.collide(B)
                B.collide(A)
        #dynamic vs walls
        for circle_point in points_in_unit_circle_border:
            thing_in_a_border = thingAtPos(A.pos+circle_point*12)
            if isinstance(thing_in_a_border,Wall):
                A.collide(thing_in_a_border)

    pygame.display.flip()

pygame.quit ()

python

optimization

pygame

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回答 2

Stack Overflow用户

回答已采纳

发布于 2012-05-04 16:14:16

在每个循环中，您都在重新绘制和翻转整个屏幕。我没有测试你的程序，但在吃豆人上我知道，屏幕上只有5个移动的精灵，你应该试着每一帧只对这些精灵进行blit (当然，如果其他事情发生了变化，也是这样)。不要使用display.flip()，只需更新您更改过的屏幕区域(这通常会大大提高速度)。

当然，你需要停止每一帧屏幕的空白，并且会有很多关于更新内容的管理。在pygame http://www.pygame.org/docs/ref/sprite.html#pygame.sprite.DirtySprite中有一些额外的对脏精灵的支持，可以帮助你做到这一点。或者你可以更新所有的“活动”精灵，将它们所在的位置清空，然后在新的位置重新绘制它们(很明显，这两个区域中的所有内容也是如此)。将受影响的矩形收集到列表中，并将其传递给update_rects()，而不是翻转屏幕。没有必要在吃豆人游戏的每一帧中都画墙……

票数 2