python - Pygame - 在两点之间移动矩形

Question

我正在尝试在 pygame 中的两点之间进行直线移动。我已经能够让它移动到另一个矩形上然后停止，但它不会像它应该的那样向后移动。我不确定我做错了什么，所以我决定寻求帮助。这是我的代码:

import pygame

width, height = 800, 600
gameDisplay = pygame.display.set_mode((width, height))
pygame.display.set_caption("Test")
gameExit = False
white = (255, 255, 255)
black = (0, 0, 0)
red = (255, 0, 0)
block_size = 10


def gameloop():
    lead_x1, lead_x2 = 1, 100
    lead_y1, lead_y2 = 1, 1
    velocity = 0.2
    gameExit = False
    white = (255, 255, 255)
    black = (0, 0, 0)
    red = (255, 0, 0)
    block_size = 10

    while not gameExit:
        gameDisplay.fill(white)
        pygame.draw.rect(gameDisplay, black, [lead_x1, lead_y1, block_size, block_size])
        pygame.draw.rect(gameDisplay, black, [lead_x2, lead_y2, block_size, block_size])
        lead_x1 += velocity
        if lead_x1 >= lead_x2:
            lead_x1 += -velocity
        if lead_x1 <= 0:
            lead_x1 += velocity
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                gameExit = True
        pygame.display.update()
    pygame.quit()
    quit()
gameloop()

Answer 1

我认为你需要放置行 lead_x1 += velocity在 else 语句中，如下所示:-

import pygame

width, height = 800, 600
gameDisplay = pygame.display.set_mode((width, height))
pygame.display.set_caption("Test")
gameExit = False
white = (255, 255, 255)
black = (0, 0, 0)
red = (255, 0, 0)
block_size = 10


def gameloop():
    lead_x1, lead_x2 = 1, 100
    lead_y1, lead_y2 = 1, 1
    velocity = 0.2
    gameExit = False
    white = (255, 255, 255)
    black = (0, 0, 0)
    red = (255, 0, 0)
    block_size = 10
    toogle_flag = 1
    while not gameExit:
        gameDisplay.fill(white)
        pygame.draw.rect(gameDisplay, black, [lead_x1, lead_y1, block_size, block_size])
        pygame.draw.rect(gameDisplay, black, [lead_x2, lead_y2, block_size, block_size])
        lead_x1 += toggle_flag * velocity
        if lead_x1 >= lead_x2:
            toggle_flag = -1*toggle_flag
        if lead_x1 <= 0:
            toggle_flag = -1*toggle_flag
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                gameExit = True
        pygame.display.update()
    pygame.quit()
    quit()
gameloop()

所以我在这里要做的是，让我们采用一个名为 toggle_flag 的标志。 ，将其初始化为1 .

1. 发件箱位于位置 1，我们添加 toggle_flag * velocity到我们的lead_x1 。即我们基本上添加 velocity .

2. 一旦我们触摸第二个框，我们就会翻转 toggle_flag 的值。至-1 。将会发生的是，我们继续添加 -velocity到我们的lead_x1 .

3. 现在，一旦我们到达 0 。我们再次翻转 toggle_flag 的值乘以 -1 ，我们让我们添加 velocity出lead_x1 。

希望这有帮助!