python - pygame 函数似乎被忽略

Question

我正在构建一个相对简单的程序来测试碰撞检测，目前一切正常，除了一件事，我试图使背景颜色随机变化，唯一的问题是它似乎完全跳过执行此操作的函数；

import pygame
from pygame.locals import *
import random, math, time, sys
pygame.init()

Surface = pygame.display.set_mode((800,600))

backgroundr = int(random.random()*255)+1
backgroundg = int(random.random()*255)+1
backgroundb = int(random.random()*255)+1

Circles = []
class Circle:
    def __init__(self):
        self.radius = int(random.random()*50) + 1
        self.x = random.randint(self.radius, 800-self.radius)
        self.y = random.randint(self.radius, 600-self.radius)
        self.speedx = 0.5*(random.random()+1.0)
        self.speedy = 0.5*(random.random()+1.0)
        self.r = int(random.random()*255)+1
        self.g = int(random.random()*255)+1
        self.b = int(random.random()*255)+1
##        self.mass = math.sqrt(self.radius)

for x in range(int(random.random()*30) + 1):
    Circles.append(Circle())

def CircleCollide(C1,C2):
    C1Speed = math.sqrt((C1.speedx**2)+(C1.speedy**2))
    XDiff = -(C1.x-C2.x)
    YDiff = -(C1.y-C2.y)
    if XDiff > 0:
        if YDiff > 0:
            Angle = math.degrees(math.atan(YDiff/XDiff))
            XSpeed = -C1Speed*math.cos(math.radians(Angle))
            YSpeed = -C1Speed*math.sin(math.radians(Angle))
        elif YDiff < 0:
            Angle = math.degrees(math.atan(YDiff/XDiff))
            XSpeed = -C1Speed*math.cos(math.radians(Angle))
            YSpeed = -C1Speed*math.sin(math.radians(Angle))
    elif XDiff < 0:
        if YDiff > 0:
            Angle = 180 + math.degrees(math.atan(YDiff/XDiff))
            XSpeed = -C1Speed*math.cos(math.radians(Angle))
            YSpeed = -C1Speed*math.sin(math.radians(Angle))
        elif YDiff < 0:
            Angle = -180 + math.degrees(math.atan(YDiff/XDiff))
            XSpeed = -C1Speed*math.cos(math.radians(Angle))
            YSpeed = -C1Speed*math.sin(math.radians(Angle))
    elif XDiff == 0:
        if YDiff > 0:
            Angle = -90
        else:
            Angle = 90
        XSpeed = C1Speed*math.cos(math.radians(Angle))
        YSpeed = C1Speed*math.sin(math.radians(Angle))
    elif YDiff == 0:
        if XDiff < 0:
            Angle = 0
        else:
            Angle = 180
        XSpeed = C1Speed*math.cos(math.radians(Angle))
        YSpeed = C1Speed*math.sin(math.radians(Angle))
    C1.speedx = XSpeed
    C1.speedy = YSpeed
    C1.r = int(random.random()*255)+1
    C1.g = int(random.random()*255)+1
    C1.b = int(random.random()*255)+1
    C2.r = int(random.random()*255)+1
    C2.g = int(random.random()*255)+1
    C2.b = int(random.random()*255)+1

def ColourCheck():
    checknumber = int(random.random()*50)+1
    if checknumber == 50:
        backgroundr = int(random.random()*255)+1
        backgroundg = int(random.random()*255)+1
        backgroundb = int(random.random()*255)+1

def Move():
    for Circle in Circles:
        Circle.x += Circle.speedx
        Circle.y += Circle.speedy
def CollisionDetect():
    for Circle in Circles:
        if Circle.x < Circle.radius or Circle.x > 800-Circle.radius:
            Circle.speedx *= -1
            Circle.r = int(random.random()*255)+1
            Circle.g = int(random.random()*255)+1
            Circle.b = int(random.random()*255)+1
        if Circle.y < Circle.radius or Circle.y > 600-Circle.radius:
            Circle.speedy *= -1
            Circle.r = int(random.random()*255)+1
            Circle.g = int(random.random()*255)+1
            Circle.b = int(random.random()*255)+1
    for Circle in Circles:
        for Circle2 in Circles:
            if Circle != Circle2:
                if math.sqrt(  ((Circle.x-Circle2.x)**2)  +  ((Circle.y-Circle2.y)**2)  ) <= (Circle.radius+Circle2.radius):
                    CircleCollide(Circle,Circle2)
def Draw():
    Surface.fill((backgroundr,backgroundg,backgroundb))
    for Circle in Circles:
        pygame.draw.circle(Surface,(Circle.r,Circle.g,Circle.b),(int(Circle.x),int(600-Circle.y)),Circle.radius)
    pygame.display.flip()

def GetInput():
    keystate = pygame.key.get_pressed()
    for event in pygame.event.get():
        if event.type == QUIT or keystate[K_ESCAPE]:
            pygame.quit(); sys.exit()

def main():
    while True:
        ColourCheck()
        GetInput()
        Move()
        CollisionDetect()
        Draw()
if __name__ == '__main__': main()

ColourCheck 函数被忽略了，知道为什么吗？

Answer 1

我相信backgroundr、backgroundg和backgroundb是ColourCheck()函数的局部变量。

如果您决定使用全局变量，请在文件顶部尝试以下操作:

global backgroundr;
global backgroundg;
global backgroundb;
backgroundr = int(random.random()*255)+1
backgroundg = int(random.random()*255)+1
backgroundb = int(random.random()*255)+1

在你的函数中:

def ColourCheck():
    global backgroundr;
    global backgroundg;
    global backgroundb;
    checknumber = int(random.random()*50)+1
    if checknumber == 50:
        backgroundr = int(random.random()*255)+1
        backgroundg = int(random.random()*255)+1
        backgroundb = int(random.random()*255)+1