PyGame开发bug？

Question

我正在使用python3.5.1开发一个太空入侵者克隆，偶然发现了一个错误，我不知道如何修复。我试图保持一个精灵在窗口内，我的代码只工作，以防止精灵离开它的顶部和左侧。这是我的密码。谢谢。你知道吗

import pygame
import sys

width = 500
height = 700

white = (255, 255, 255)
black = (0, 0, 0)

score = 0

screen = pygame.display.set_mode([width, height])
screen_rect = screen.get_rect()

class Ship(pygame.sprite.Sprite):
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.image.load("player.png").convert()
        self.rect = self.image.get_rect()

    def update(self):
        pos_x, pos_y = pygame.mouse.get_pos()
        player_rect = self.image.get_rect()
        self.rect.x = pos_x
        self.rect.y = pos_y

        player_rect.clamp_ip(screen_rect)

class Enemy(pygame.sprite.Sprite):
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.image.load("enemy.png").convert()
        self.rect = self.image.get_rect()

class Bullet(pygame.sprite.Sprite):
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.image.load("laser.png").convert()
        self.rect = self.image.get_rect()

player = Ship()
allSprites = pygame.sprite.Group()
allSprites.add(player)

running = True
while running == True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()

    screen.fill(black)
    player.update()
    allSprites.draw(screen)

    pygame.display.flip()

pygame.quit()

Answer 1

更改def update(self):如下：

    def update(self):
        pos_tup = pygame.mouse.get_pos() # edit fix
        pos_x = pos_tup[0] # edit fix
        pos_y = pos_tup[1] # edit fix
        player_rect = self.image.get_rect()
        if pos_x < 0:
            self.rect.x = 0
        elif pos_x > width:
            self.rect.x = width
        else:
            self.rect.x = pos_x
        if pos_y < 0:
            self.rect.y = 0
        elif pos_y > height:
            self.rect.y = height
        else:
            self.rect.y = pos_y
        player_rect.clamp_ip(screen_rect)

Answer 2

对象在self.rect中已经有一个Rect对象；实际上您并没有调用右边的clamp_ip方法。你知道吗

打电话给self.rect.clamp_ip(screen_rect)就足够了，甚至不用费心去获取图像Rect。如果我没有记错的话，Sprite Group的内置draw方法应该只在Sprite的Rect中绘制图像，所以只要确保您只正确更新了Sprite的Rect。你知道吗

def update(self):
    self.rect.topleft = pygame.mouse.get_pos()
    if not screen_rect.contains(self.rect):
        self.rect.clamp_ip(screen_rect)