Pygame 中的顺序图像呈现 [英] Sequential image presentation in Pygame

问题描述

一个简单的问题，但我是 Python/Pygame 的新手.我想 blit 图像(old.png)，然后在按键(空格键)上将该图像替换为另一个图像(new.png):顺序演示.目前，old.png 仍保留在表面上，而 new.png 最终位于其顶部.

A simple problem, but i am new to Python/Pygame. I want to blit an image (old.png) and then have that image be replaced by another image (new.png) upon a keypress (spacebar): sequential presentation. Currently, the old.png remains on the surface, with new.png ending up on top of it.

这是我的代码:

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

    screen.blit(old, (display_width/2, display_height/2))
    if event.type == pygame.KEYDOWN:
        if event.key == pygame.K_SPACE:
           screen.blit(new, (display_width/2, display_height/2))

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

推荐答案

您可以将图像保留在列表中并使用索引 current_image 选择要显示的图像.这样你就可以拥有 2 张以上的图片.

You can keep images on list and use index current_image to select image to display. This way you can have more than 2 images.

# all images on list

images = []

images.append(old)
images.append(new)
images.append(another_image)
#images.append(another_image_2)
#images.append(another_image_3)

# how many images we have ?
images_number = len(image)

# index of current displayed image
current_image = 0


# in mainloop

while True:

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

        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:

                # get next index (if it is bigger than `images_number` then get `0`) 
                current_image = (current_image + 1) % images_number

    # clear screen
    screen.fill((0,,0)) # black

    # blit current image
    screen.blit(images[current_image], (display_width/2, display_height/2))


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

--

顺便说一句:你可以使用

screen_rect = screen.get_rect() 

然后你可以使用

screen_rect.center

代替

(display_width/2, display_height/2)

在

screen.blit(images[current_image], screen_rect.center)

但如果你想正确居中图像，你需要图像矩形

but if you want to center image correctly you need image rect

# get image rect
image_rect = images[current_image].get_rect()

# center image rect on the screen
image_rect.center = screen_rect.center

# draw image using `image_rect`
screen.blit(images[current_image], image_rect)

这篇关于Pygame 中的顺序图像呈现的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！