pygame小白
註釋掉的是以前的，碰撞後在該方向上後退。但如果兩個方向鍵一起按，會從奇怪的地方飛出去
改進後在移動前判斷一次，移動後判斷一次
稍微提高了碰撞體驗，但還是會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()
    # """發生碰撞，該方向上退兩個畫素"""
    # 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
    ## 確定方向
    self.direction = 3
    self.speed = [0, -2]
    ## 改變位置
    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)