python pygame 背景图片随屏幕大小变化 [英] python pygame the background image changes with the screen size

问题描述

我将 screen=p.display.set_mode((width,height),flag,0) 设置为我的 pygame 屏幕，flag=p.RESIZABLE 使屏幕可以拉伸.

I set screen=p.display.set_mode((width,height),flag,0) as my pygame screen and flag=p.RESIZABLE makes the screen can be stretch.

此时我加载了一张图片作为背景，现在当我拉伸屏幕时，背景不会随着屏幕改变大小，我该怎么做?

At this time i load an image as the background, now when i stretch the screen, the background wont change the size by the screen, how can i do it?

代码如下:

#! /usr/bin/python
import sys
import pygame as p

pic="/home/finals/python/alien/image/muha.png"

def screen_setting(width,height):
    p.init()
    flag=p.RESIZABLE   
    screen=p.display.set_mode((width,height),flag,0)
    bk=p.transform.smoothscale(p.image.load(pic).convert(),(width,height))

    while True:
        for event in p.event.get():
            if event.type == p.QUIT:
                sys.exit()
        screen.blit(bk,(0,0))
        p.display.flip()

screen_setting(1200,800)

推荐答案

您必须实现 VIDEORESIZE 事件(请参阅 pygame.event).

You have to implement the VIDEORESIZE event (see pygame.event).

当窗口被调整大小时，然后从偶数属性中获取窗口的新大小:

When the window is resized, then get the new size of the window from the even attributes:

width, height = event.w, event.h

创建一个与窗口关联的新 Surface 并将背景缩放到新大小:

Create a new Surface associated to the window and scale the background to the new size:

def screen_setting(width,height):
    p.init()
    flag = p.RESIZABLE   
    screen=p.display.set_mode((width, height), flag, 0)
    bk_orig = p.image.load(pic).convert()
    bk = p.transform.smoothscale(bk_orig, (width, height))

    while True:
        for event in p.event.get():
            if event.type == p.QUIT:
                sys.exit()
            elif event.type == p.VIDEORESIZE:
                width, height = event.w, event.h
                screen = p.display.set_mode((width, height), flag, 0)
                bk = p.transform.smoothscale(bk_orig, (width, height))

        screen.blit(bk, (0 ,0))
        p.display.flip()

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