Pygame 旋转行删除旧行 [英] Pygame rotate line delete old line

问题描述

如何使用 math 模块在 pygame 中旋转一行，每隔一秒旋转一行删除旧行.我刚刚使用了其他代码，但问题是旧线旋转，所以我看到了阳光效果.

解决方案

为了轻松地帮助您找到问题的具体答案，您确实需要展示您的代码.请参阅

How can I rotate a line in pygame using math module and every second rotate line delete old line. I've just used other code but the problem was old line rotate and so I watched an sunshine effect.

解决方案

To easily assist you with a specific answer for your problem, you really need to show your code. Please see how to ask.

I've prepared a generic example that randomises one end point of a line when a mouse button is clicked.

# pyg_line_demo
import pygame
import random

def get_random_position():
    """return a random (x,y) position in the screen"""
    return (random.randint(0, screen_width - 1),  #randint includes both endpoints.
            random.randint(0, screen_height - 1)) 

def random_line(line):
    """ Randomise an end point of the line"""
    if random.randint(0,1):
        return [line[0], get_random_position()]
    else:
        return [get_random_position(), line[-1]]


# initialisation
pygame.init()
screen_width, screen_height = 640, 480
surface = pygame.display.set_mode((screen_width,screen_height))
pygame.display.set_caption('Lines')
clock = pygame.time.Clock() #for limiting FPS
FPS = 30

# initial line
line = [(10, 10), (200, 200)]

finished = False
while not finished:
    for event in pygame.event.get():            
        if event.type == pygame.QUIT:
            finished = True
        if event.type == pygame.MOUSEBUTTONDOWN:
            line = random_line(line)
    #redraw background
    surface.fill(pygame.Color("white"))
    #draw line
    pygame.draw.aalines(surface, pygame.Color("blue"), False, line)
    # update display
    pygame.display.update()
    #limit framerate
    clock.tick(FPS)
pygame.quit()

You should be able to insert your line rotation function in place of the random_line() function.

Let us know if you have any further questions.

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