Python实现超级玛丽游戏系列教程03玛丽跳跃

def falling(self, keys, current_time):
        self.y_vel += self.gravity
        if (self.rect.bottom > (600 - self.rect.height)):
            self.y_vel = 0
            self.gravity = c.GRAVITY
            self.state = c.WALK
        if keys[pg.K_LEFT]:
            self.facing_right = False
            if self.x_vel > (self.max_x_vel * - 1):
                self.x_vel -= self.x_accel
        elif keys[pg.K_RIGHT]:
            self.facing_right = True
            if self.x_vel < self.max_x_vel:
                self.x_vel += self.x_accel