在pygame中旋转一个矩形（不是图像）

Question

在pygame中，我pygame.draw.rect(screen, color, rectangle)在程序中使用了所有矩形。我希望能够将这些矩形旋转到任意角度。我已经看到以下代码来旋转图像，但是我的问题是RECTANGLES。

pygame.transform.rotate(image, angle)

但是我正在使用矩形，但是我没有可以旋转的图像或“表面”。当我尝试旋转一个矩形

rect = pygame.draw.rect(screen, self.color, self.get_rectang())
rotatedRect = pygame.transform.rotate(rect, self.rotation)
screen.blit(rotatedRect)

这给出TypeError: must be pygame.Surface, not pygame.Rect了.rotate（）

我的问题是，如何(x,y,w,h)在pygame中旋转a并显示RECTANGLE 而不是图像。

这是“潜在重复项”的链接文章不是重复项。一个答案解释了旋转矩形的后果，另一个答案使用代码旋转图像。

Answer 1

请参阅此处的第二个答案：Rotating a point about another point (2D)

我认为矩形只能是水平或垂直的。您需要定义角并旋转它们，然后在它们之间绘制和填充。

另一种方法是创建一个类

class myRect(pygame.Surface):
    def __init__(self, parent, xpos, ypos, width, height):
      super(myRect, self).__init__(width, height)
      self.xpos = xpos
      self.ypos = ypos
      self.parent = parent

    def update(self, parent):
      parent.blit(self, (self.xpos, self.ypos))

    def rotate(self, angle):
      #(your rotation code goes here)

并使用它，因为这样您就可以使用变换功能旋转它。

Answer 2

import pygame as py  

# define constants  
WIDTH = 500  
HEIGHT = 500  
FPS = 30  

# define colors  
BLACK = (0 , 0 , 0)  
GREEN = (0 , 255 , 0)  

# initialize pygame and create screen  
py.init()  
screen = py.display.set_mode((WIDTH , HEIGHT))  
# for setting FPS  
clock = py.time.Clock()  

rot = 0  
rot_speed = 2  

# define a surface (RECTANGLE)  
image_orig = py.Surface((100 , 100))  
# for making transparent background while rotating an image  
image_orig.set_colorkey(BLACK)  
# fill the rectangle / surface with green color  
image_orig.fill(GREEN)  
# creating a copy of orignal image for smooth rotation  
image = image_orig.copy()  
image.set_colorkey(BLACK)  
# define rect for placing the rectangle at the desired position  
rect = image.get_rect()  
rect.center = (WIDTH // 2 , HEIGHT // 2)  
# keep rotating the rectangle until running is set to False  
running = True  
while running:  
    # set FPS  
    clock.tick(FPS)  
    # clear the screen every time before drawing new objects  
    screen.fill(BLACK)  
    # check for the exit  
    for event in py.event.get():  
        if event.type == py.QUIT:  
            running = False  

    # making a copy of the old center of the rectangle  
    old_center = rect.center  
    # defining angle of the rotation  
    rot = (rot + rot_speed) % 360  
    # rotating the orignal image  
    new_image = py.transform.rotate(image_orig , rot)  
    rect = new_image.get_rect()  
    # set the rotated rectangle to the old center  
    rect.center = old_center  
    # drawing the rotated rectangle to the screen  
    screen.blit(new_image , rect)  
    # flipping the display after drawing everything  
    py.display.flip()  

py.quit()