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Creating a permanent background in pygame(在pyGame中创建永久背景)

转载 作者：bug小助手 更新时间：2023-10-24 20:37:43 30 4
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I have a program where I am using mouse controls to move objects. When the objects move, the program resets the screen to solid white so that there are no trails of the object using:

我有一个使用鼠标控制来移动对象的程序。当物体移动时，程序会将屏幕重置为纯白，这样就不会出现物体的痕迹，方法是：



screen.fill(255,255,255)


What I am trying to do now is have the background a created background I made in a method.

我现在想做的是让背景成为我用一种方法制作的背景。



black = (0,0,0)
brown = (218,134,10)
white = (255,255,255)
pygame.draw.rect(screen,white,(0,0,1000,600))

first =pygame.draw.rect(screen,brown,(150,150,50,400),0)
second = pygame.draw.rect(screen,brown,(450,150,50,400),0)
third = pygame.draw.rect(screen,brown,(750,150,50,400),0)

first_out = pygame.draw.rect(screen,black,(150,150,50,400),2)
second_out = pygame.draw.rect(screen,black,(450,150,50,400),2)
third_out= pygame.draw.rect(screen,black,(750,150,50,400),2)


How can I make my background the background that refreshes every time an object is moved?

如何使我的背景成为每次移动对象时都会刷新的背景？


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Rather than drawing directly on the screen surface, you should create a new surface, let's call it background_surface.

不是直接在屏幕表面上绘制，而是应该创建一个新的表面，让我们将其命名为BACKGROUND_SERFACE。



By doing so, you will only have to draw the background once (at the very beginning of your application) and any blitting afterwards will be done a lot quicker, since no pygame.draw.xxx is being done.

通过这样做，您将只需要绘制一次背景(在应用程序的最开始)，之后的任何blit都将更快地完成，因为不会执行pygame.dra.xxx。



To fill the screen surface with background_surface, you'll just use screen.blit().

要使用BACKGROUND_Surface填充屏幕表面，只需使用creen.blit()即可。





A quick snippet:

下面是一个简短的代码片段：



WIDTH, HEIGHT = 800, 600
background_surface = pygame.Surface((WIDTH, HEIGHT))

# do all the drawings on the background surface
background_surface.fill((255, 255, 255))

while application_running:
    # processinput
    # update objects
    # draw everything
    screen.blit(background_surface, (0, 0))
    pygame.display.update()

更多回答

This is just giving an error saying background_surface is not defined

这只是给出了一个错误，提示没有定义BACKGROUND_SERFACE

That is caused by background_surface being out-of-scope. Shouldn't be much trouble to fix that error. The code I provided was just an example.

这是由于BACKGROUND_Surface超出范围所致。修复这个错误应该不会有太大麻烦。我提供的代码只是一个示例。

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