python - 如何在 pygame 中进行平滑移动 + 旋转？

Question

我试图让宇宙飞船朝着鼠标指针移动，如果它四处移动，则旋转以跟随指针。目前，旋转工作正常，线性运动工作正常，但由于某种原因，如果船同时旋转和移动，它在旋转时会在原地摇晃，不再向前移动。 Here is a gif我的问题的澄清。下面我有相关的代码。

编辑:我刚刚发布了整个类(class)，希望能让事情变得不那么困惑。

class player():
    def __init__(self, x_position, y_position, length, height):
        self.x = x_position
        self.y = y_position
        self.l = length
        self.h = height
        self.player_ship = pygame.transform.scale(ships[0], (128, 128))
        self.angle = 0
    def draw(self, win):
        cx, cy = pygame.mouse.get_pos()
        img_copy = pygame.transform.rotate(self.player_ship, math.atan2(self.x - cx, self.y - cy)*57.2957795)
        win.blit(img_copy, (self.x - int(img_copy.get_width() / 2), self.y - int(img_copy.get_height() / 2)))
    def move(self, speed):
        cx, cy = pygame.mouse.get_pos()
        self.angle = math.atan2(cx - self.x, cy - self.y)*57.2957795
        movement_x = math.cos(self.angle) * speed
        movement_y = math.sin(self.angle) * speed
        self.x -= movement_x
        self.y += movement_y

我在某处读到我不应该将我的位置存储为整数，但我不完全确定如何跟踪位置。我非常感谢任何人必须提供的任何提示或指示。

Answer 1

该问题是由旋转 Sprite 的代码引起的。
旋转图片，得到pygame.Rect涂层图像。通过对象的位置设置矩形的中心。使用矩形对图像进行 blit。
见 How do I rotate an image around its center using Pygame? .

img_copy = pygame.transform.rotate(self.player_ship, self.angle)
rotated_rect = img_copy.get_rect(center = (round(self.x), round(self.y)))

要旋转图像，计算单位方向向量就足够了 [参见 Unit vector .)] 从当前位置到鼠标位置。按速度缩放向量并将其添加到位置:

cx, cy = pygame.mouse.get_pos()
dx, dy = cx - self.x, cy - self.y
if abs(dx) > 0 or abs(dy) > 0:
    dist = math.hypot(dx, dy)
    self.x += min(dist, speed) * dx/dist
    self.y += min(dist, speed) * dy/dist

看例子

class player():
    def __init__(self, x_position, y_position, length, height):
        self.x = x_position
        self.y = y_position
        self.l = length
        self.h = height
        self.player_ship = pygame.transform.scale(ships[0], (128, 128))
        self.angle = 0
    
    def draw(self, win):
     
        cx, cy = pygame.mouse.get_pos()
        dx, dy = cx - self.x, cy - self.y
        if abs(dx) > 0 or abs(dy) > 0:
            self.angle = math.atan2(-dx, -dy)*57.2957795

        img_copy = pygame.transform.rotate(self.player_ship, self.angle)
        rotated_rect = img_copy.get_rect(center = (round(self.x), round(self.y)))
        
        win.blit(img_copy, rotated_rect)
    
    def move(self, speed):
        cx, cy = pygame.mouse.get_pos()
        dx, dy = cx - self.x, cy - self.y
        if abs(dx) > 0 or abs(dy) > 0:
            dist = math.hypot(dx, dy)
            self.x += min(dist, speed) * dx/dist
            self.y += min(dist, speed) * dy/dist