问题描述
我是 Pygame 的新手,我刚刚开始制作乒乓球游戏。下面的代码还没有完成,但是由于某种原因,球不会移动。它仅在我在“draw_ball”方法中设置“ball_draw = pygame...”而不是初始化方法时才有效。但是,如果我这样做,我就不能在类中使用“wallCollision”方法,因为“ball_draw”将是一个局部变量,而不是整个类的属性,因此无法在其他方法中访问。我怎样才能解决这个问题?感谢您的帮助。
import pygame,sys
pygame.init()
clock = pygame.time.Clock()
screen_width = 1280
screen_height = 960
bgColor = pygame.Color("grey12")
lightGrey = (200,200,200)
screen = pygame.display.set_mode((screen_width,screen_height))
pygame.display.set_caption("Pong Game")
class BALL:
def __init__(self):
self.ball_width = 30
self.ball_height = 30
self.ball_x = screen_width/2 - self.ball_width
self.ball_y = screen_height/2 - self.ball_height
self.ball_speed_x = 7
self.ball_speed_y = 7
self.ball_draw = pygame.Rect(self.ball_x,self.ball_y,self.ball_width,self.ball_height)
def draw_ball(self):
pygame.draw.ellipse(screen,lightGrey,self.ball_draw)
def move_ball(self):
self.ball_x += self.ball_speed_x
self.ball_y += self.ball_speed_y
def wallCollision(self):
if self.ball_draw.bottom >= screen_height:
self.ball_speed_y *= -1
if self.ball_draw.top <= 0:
self.ball_speed_y *= -1
if self.ball_draw.left <= 0:
self.ball_speed_x *= -1
if self.ball_draw.right >= screen_width:
self.ball_speed_x *= -1
class PLAYER1:
def __init__(self):
self.player1_width = 10
self.player1_height = 140
self.player1_x = screen_width - 20
self.player1_y = screen_height/2 - 70
def draw_player1(self):
player1_draw = pygame.Rect(self.player1_x,self.player1_y,self.player1_width,self.player1_height)
pygame.draw.rect(screen,player1_draw)
def move_player1(self):
keys = pygame.key.get_pressed()
if keys[pygame.K_UP] and self.player1_y >= 0:
self.player1_y -= 5
if keys[pygame.K_DOWN] and self.player1_y <= screen_height:
self.player1_y += 5
ball = BALL()
player1 = PLAYER1()
while True:
# Checking for events
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
sys.exit()
# Drawing on screen
screen.fill(bgColor)
ball.draw_ball()
player1.draw_player1()
# Movement and Collisions
ball.move_ball()
player1.move_player1()
ball.wallCollision()
# Updating screen
pygame.display.flip()
# Defining 60 frames per second (FPS)
clock.tick(60)
解决方法
您使用矩形属性 self.ball_draw
来绘制球。因此,如果您移动球并更改 self.ball_x
和 self.ball_y
属性,则需要更新矩形:
class BALL:
# [...]
def draw_ball(self):
pygame.draw.ellipse(screen,lightGrey,self.ball_draw)
def move_ball(self):
self.ball_x += self.ball_speed_x
self.ball_y += self.ball_speed_y
self.ball_draw.topleft = (self.ball_x,self.ball_y)