pygame:我tm终于不卡墙了

pygame小白
注释掉的是以前的，碰撞后在该方向上后退。但如果两个方向键一起按，会从奇怪的地方飞出去
改进后在移动前判断一次，移动后判断一次
稍微提高了碰撞体验，但还是会在莫名其妙的地方卡住。。。

key_pressed = pygame.key.get_pressed()

if key_pressed[K_RIGHT]:
    # main_chara.go_right()
    # """发生碰撞，该方向上退两个像素"""
    # while collide_test(main_chara, c_map):
    #     main_chara.rect.right -= 2
    if collide_test(main_chara, c_map):
        main_chara.rect.right -= 2
    else:
        main_chara.go_right()
    if collide_test(main_chara, c_map):
        main_chara.rect.right -= 2
if key_pressed[K_UP]:
    # main_chara.go_up()
    # while collide_test(main_chara, c_map):
    #     main_chara.rect.top += 2
    if collide_test(main_chara, c_map):
        main_chara.rect.top += 2
    else:
        main_chara.go_up()
    if collide_test(main_chara, c_map):
        main_chara.rect.top += 2
if key_pressed[K_LEFT]:
    # main_chara.go_left()
    # while collide_test(main_chara, c_map):
    #     main_chara.rect.left += 2
    if collide_test(main_chara, c_map):
        main_chara.rect.left += 2
    else:
        main_chara.go_left()
    if collide_test(main_chara, c_map):
        main_chara.rect.left += 2
if key_pressed[K_DOWN]:
    # main_chara.go_down()
    # while collide_test(main_chara, c_map):
    #     main_chara.rect.bottom -= 2
    if collide_test(main_chara, c_map):
        main_chara.rect.bottom -= 2
    else:
        main_chara.go_down()
    if collide_test(main_chara, c_map):
        main_chara.rect.bottom -= 2

###class character

def go_up(self):
    self.moving = True
    ## 确定方向
    self.direction = 3
    self.speed = [0, -2]
    ## 改变位置
    self.rect = self.rect.move(self.speed)

def go_down(self):
    self.moving = True
    self.direction = 0
    self.speed = [0, 2]
    self.rect = self.rect.move(self.speed)

def go_left(self):
    self.moving = True
    self.direction = 1
    self.speed = [-2, 0]
    self.rect = self.rect.move(self.speed)

def go_right(self):
    self.moving = True
    self.direction = 2
    self.speed = [2, 0]
    self.rect = self.rect.move(self.speed)