在使用vector2时，我在游戏中出错

Question

我得到了一个

不支持+=的操作数类型：“NoneType”和“pygame.math.Vector2”

运行以下代码：

import pygame
from settings import *
vec = pygame.math.Vector2

class Player:
    def __init__(self, app, pos):
        self.app = app
        self.grid_pos = pos
        self.pix_pos = self.get_pix_pos()
        self.direction = vec(1,0)
        
    def update(self):
        self.pix_pos += self.direction

    def draw(self):
        pygame.draw.circle(self.app.screen, PLAYER_COLOUR, self.pix_pos,
        self.app.cell_width//2-2)
    def move(self, direction):
        self.direction = direction
    def get_pix_pos (self):
        vec((self.grid_pos.x*self.app.cell_width)+TOP_BOTTOM_BUFFER//2+self.app.cell_width//2, (self.grid_pos.y*self.app.cell_height)+TOP_BOTTOM_BUFFER//2+self.app.cell_height//2)

错误在第15行。

Answer 1

return语句在Player.get_pix_pos方法中缺失

class Player:
    # [...]

    def get_pix_pos (self):
        return vec((self.grid_pos.x*self.app.cell_width)+TOP_BOTTOM_BUFFER//2+self.app.cell_width//2, (self.grid_pos.y*self.app.cell_height)+TOP_BOTTOM_BUFFER//2+self.app.cell_height//2)