闪烁弹丸

Question

我一直在做一个项目，这个项目有一个角色，由一个加载的图像组成，他可以发射弹丸。在这种情况下，我的角色是萨诺斯，我让他发射一个紫色能量球的东西。我已经设置好了，当我按下"e“键时，球就会出现，并且应该会飞走。然而，当我按下"e“键时，球就会出现并闪烁。它发射了一次，然后在塔诺斯重新出现，仍然闪烁。这是我的代码：(忽略无穷大的石头，我还没有开始处理它们，而且我可能粘贴了错误的代码这是我在这里的第一篇文章)

import pygame

pygame.init()

WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
GREY = (150, 150, 150)

FRAMERATE = 100

SCREENWIDTH = 800
SCREENHEIGHT = 800

using_power_blast = False

screenSize = (SCREENWIDTH, SCREENHEIGHT)

screen = pygame.display.set_mode(screenSize)

thanosHeight = 130
thanosWidth = 80

thanosImg = pygame.image.load("thanos.png")
thanosLeftImg = pygame.image.load("thanos_left.png")
thanosImg = pygame.transform.scale(thanosImg, (thanosWidth, thanosHeight))
thanosLeftImg = pygame.transform.scale(thanosLeftImg, (thanosWidth, thanosHeight))
thanos_x = 400
thanos_y = 400
thanos_vel = 2

thanos_orientation = "right"

time_stone = pygame.image.load("time_stone.png")
power_stone = pygame.image.load("power_stone.png")
space_stone = pygame.image.load("space_stone.png")
mind_stone = pygame.image.load("mind_stone.png")
soul_stone = pygame.image.load("soul_stone.png")
reality_stone = pygame.image.load("reality_stone.png")

p_width = 100
p_height = 100
p_x = thanos_x
p_y = thanos_y
p_vel = 5

power_blast = pygame.image.load("power_blast_round.png")
power_blast = pygame.transform.scale(power_blast, (p_width, p_height))


def thanos(x, y):
    global thanos_x
    global thanos_y
    x = thanos_x
    y = thanos_y
    if thanos_orientation == "right":
        screen.blit(thanosImg, (x, y))
    if thanos_orientation == "left":
        screen.blit(thanosLeftImg, (x, y))


running = True
clock = pygame.time.Clock()

while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    if using_power_blast:
        screen.blit(power_blast, (thanos_x, thanos_y))
        if thanos_orientation == "left":
            p_x -= p_vel
            screen.blit(power_blast, (p_x, p_y))
            pygame.display.update()
        if thanos_orientation == "right":
            p_x += p_vel
            pygame.display.update()

    screen.fill(GREY)
    thanos(thanos_x, thanos_y)
    pygame.display.update()

    keys = pygame.key.get_pressed()

    if keys[pygame.K_a] and thanos_x > thanos_vel:
        thanos_x -= thanos_vel
        thanos_moving_left = True
        thanos_orientation = "left"
    if keys[pygame.K_d] and thanos_x < SCREENWIDTH - thanosWidth - thanos_vel:
        thanos_x += thanos_vel
        thanos_moving_right = True
        thanos_orientation = "right"
    if keys[pygame.K_w] and thanos_y > thanos_vel:
        thanos_y -= thanos_vel
    if keys[pygame.K_s] and thanos_y < SCREENHEIGHT - (thanosWidth + 45) - thanos_vel:
        thanos_y += thanos_vel
    if keys[pygame.K_e]:
        using_power_blast = True

    clock.tick(FRAMERATE)

pygame.quit()

Answer 1

你应该只有一个update()，而且你必须在fill()和updated()之间选择

fill()清除缓冲区，update()将缓冲区发送到视频卡，并将其显示在屏幕上。

如果你在fill()之前进行blit，那么fill()会将它从buffer中移除，你将看不到它。但是你不应该使用update()来解决这个问题。

如果你在blit缓冲区中的所有元素之前使用update()，那么它将显示不完整的图像，下一个update()将显示完整的图像，因此您可能会看到翻转的元素。

while running:

    # --- events (without draws) ---

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    keys = pygame.key.get_pressed()

    if keys[pygame.K_a] and thanos_x > thanos_vel:
        thanos_x -= thanos_vel
        thanos_moving_left = True
        thanos_orientation = "left"
    if keys[pygame.K_d] and thanos_x < SCREENWIDTH - thanosWidth - thanos_vel:
        thanos_x += thanos_vel
        thanos_moving_right = True
        thanos_orientation = "right"
    if keys[pygame.K_w] and thanos_y > thanos_vel:
        thanos_y -= thanos_vel
    if keys[pygame.K_s] and thanos_y < SCREENHEIGHT - (thanosWidth + 45) - thanos_vel:
        thanos_y += thanos_vel
    if keys[pygame.K_e]:
        # is it new power blast ?
        if using_power_blast is False:
            # new power blast starts in thanos position
            using_power_blast = True 
            p_x = thanos_x
            p_y = thanos_y

    # --- moves/changes (without draws) ---

    if using_power_blast:
        if thanos_orientation == "left":
            p_x -= p_vel
        if thanos_orientation == "right":
            p_x += p_vel

    # --- draws (without moves) ---

    # clear buffer
    screen.fill(GREY)

    # draw/blit all elements 

    if using_power_blast:
        screen.blit(power_blast, (p_x, p_y))

    thanos(thanos_x, thanos_y)

    # send buffer on screen
    pygame.display.update()

    # --- FPS ---

    clock.tick(FRAMERATE)

我没有测试它，但它应该可以工作。

我还必须添加代码：

    if keys[pygame.K_e]:
        # is it new power blast ?
        if using_power_blast is False:
            # new power blast starts in thanos position
            using_power_blast = True 
            p_x = thanos_x
            p_y = thanos_y