如何在pygame中旋轉線條？

Question

我在pygame裏做遊戲，我有一個有兩點的線段。我需要在幾秒鐘內旋轉該段，而不調整它的大小。我怎樣才能做到這一點？

Answer 1

您可以在這裏找到答案：pygame rotating a line

我只用向量。

import sys 
import pygame 

pygame.init() 

SIZE = 640, 480 
screen = pygame.display.set_mode(SIZE) 
FPSCLOCK = pygame.time.Clock() 

startpoint = pygame.math.Vector2(320, 240) 
endpoint = pygame.math.Vector2(170, 0) 
angle = 0 

done = False 
while not done: 
    for event in pygame.event.get(): 
     if event.type == pygame.QUIT: 
      done = True 

    angle = (angle+5) % 360 
    # The current endpoint is the startpoint vector + the 
    # rotated original endpoint. 
    current_endpoint = startpoint + endpoint.rotate(angle) 

    screen.fill((0, 0, 0)) 
    pygame.draw.line(
     screen, pygame.Color("red"), startpoint, current_endpoint, 2) 

    pygame.display.flip() 
    FPSCLOCK.tick(30) 

pygame.quit() 
sys.exit(0)