pygame 定义不同的位置顺序产生不同的结果 [英] pygame define different position order make the different result

问题描述

我定义了对象的不同位置顺序，然后我发现它出错了.

1. 我希望我的 button_surface 位于 screen 的中心，所以我定义了
   self.button_surface_rect.center = self.setting.screen_rect.center

2. 然后在screen
   的中心制作text_surface_rectself.text_surface_rect.center = self.setting.screen_rect.center

3. 将 text_rect 放在 text_surface
   的中心self.text_rect.center = self.text_surface_rect.center

当我 blit 屏幕时，我的 text_surface 上没有文字，为什么?

代码如下:

#!/usr/bin/python导入系统，操作系统导入pygame类设置():def __init__(self,width,height):self.w=宽度self.h=身高self.flag=pygame.RESIZABLEself.color=(255,255,255)self.screen=pygame.display.set_mode((self.w,self.h),self.flag)self.screen_rect=self.screen.get_rect()pygame.display.set_caption("哇哈哈")类按钮():def __init__(self,setting,text):self.setting = 设置self.text_color=(0,0,255)self.button_color=(0,100,100)self.rect=pygame.Rect(0,0,400,100)self.rect.center = self.setting.screen_rect.centerself.text=pygame.font.Font(None,80).render(text,True,self.text_color)self.text_surface=pygame.Surface((400,100))self.text_surface.set_colorkey((0,0,0))self.button_surface=pygame.Surface((400,100))self.button_surface.set_alpha(128)self.button_surface_rect = self.button_surface.get_rect()self.button_surface_rect.center = self.setting.screen_rect.center'''当我定义这个时，我看不到文本'''self.text_surface_rect = self.text_surface.get_rect()self.text_surface_rect.center = self.setting.screen_rect.centerself.text_rect = self.text.get_rect()打印(self.text_rect)打印(self.text_surface_rect)self.text_rect.center = self.text_surface_rect.center打印(self.text_rect)def blit_button(self):self.button_surface.fill(self.button_color)self.setting.screen.blit(self.button_surface,self.button_surface_rect)self.text_surface.blit(self.text,self.text_rect)self.setting.screen.blit(self.text_surface,self.button_surface_rect)定义游戏():pygame.init()设置=设置(1200,800)按钮=按钮(设置，'播放')为真:对于 pygame.event.get() 中的事件:如果 event.type == pygame.QUIT:系统退出()setting.screen.fill((255,0,0))button.blit_button()pygame.display.flip()游戏()

解决方案

self.setting.screen_rect.center 是大屏幕的中心.但是文本不是 blit 到屏幕上，而是在小的 text_surface 上 blit.

<块引用>

self.text_surface.blit(self.text,self.text_rect)

text_surface的大小是(400, 100)，但是self.text_rect的中心是(600, 400).

如果你这样做

<块引用>

self.text_surface_rect.center = self.setting.screen_rect.center[...]self.text_rect.center = self.text_surface_rect.center

那么 self.text_surface_rect 的位置远远超出 self.text_surface 的范围.屏幕的中心 (self.setting.screen_rect.center) 是 (600, 400).但是text_surface的大小是(400, 100).

+--------------+|文字表面|+--------------+尺寸:(400, 100)+-----------+|text_rect|中心:(600, 400)+-----------+

<小时>

注意text_surface_rect 是(400, 350, 400, 100)，但是text_surface 是一个Surface 对象并且没有它刚刚拥有的位置大小为 (400, 100).你可以把它想象成一个矩形 (0, 0, 400, 100).
文本在 text_surface 上是 blit 而不是在 text_surface_rect 上.

<小时>

您必须计算相对于 self.button_surface_rect 的位置，而不是 self.setting.screen:

self.text_surface_rect.center = (self.setting.screen_rect.centerx - self.button_surface_rect.x,self.setting.screen_rect.centery - self.button_surface_rect.y)

I define the different position order of my object, then I found it makes an error.

1. I want to my button_surface on the center of the screen so I define
   self.button_surface_rect.center = self.setting.screen_rect.center

2. Then make the text_surface_rect on the center of the screen
self.text_surface_rect.center = self.setting.screen_rect.center

3. Put the text_rect on the center of the text_surface
self.text_rect.center = self.text_surface_rect.center

When I blit the screen, there's no text on my text_surface, why?

Here's the code:

#!/usr/bin/python
import sys,os
import pygame
class Setting():
    def __init__(self,width,height):
        self.w=width
        self.h=height
        self.flag=pygame.RESIZABLE
        self.color=(255,255,255)
        self.screen=pygame.display.set_mode((self.w,self.h),self.flag)
        self.screen_rect=self.screen.get_rect()
        pygame.display.set_caption("Muhaha")


class Button():
    def __init__(self,setting,text):
        self.setting = setting
        self.text_color=(0,0,255)
        self.button_color=(0,100,100)

        self.rect=pygame.Rect(0,0,400,100)
        self.rect.center = self.setting.screen_rect.center

        self.text=pygame.font.Font(None,80).render(text,True,self.text_color)
        self.text_surface=pygame.Surface((400,100))
        self.text_surface.set_colorkey((0,0,0)) 

        self.button_surface=pygame.Surface((400,100))
        self.button_surface.set_alpha(128)

        self.button_surface_rect = self.button_surface.get_rect()
        self.button_surface_rect.center = self.setting.screen_rect.center

        '''when i define this i cant see the textz'''
        self.text_surface_rect = self.text_surface.get_rect()
        self.text_surface_rect.center = self.setting.screen_rect.center

        self.text_rect = self.text.get_rect()
        print(self.text_rect)
        print(self.text_surface_rect)
        self.text_rect.center = self.text_surface_rect.center
        print(self.text_rect)

    def blit_button(self):
        self.button_surface.fill(self.button_color)
        self.setting.screen.blit(self.button_surface,self.button_surface_rect)
        self.text_surface.blit(self.text,self.text_rect)
        self.setting.screen.blit(self.text_surface,self.button_surface_rect)



def game():
    pygame.init()
    setting=Setting(1200,800)
    button=Button(setting,'PLAY')


    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
        setting.screen.fill((255,0,0))
        button.blit_button()
        pygame.display.flip()
game()

解决方案

self.setting.screen_rect.center is the center of the large screen. But the text is not blit onto the screen, it is blit on the small text_surface.

self.text_surface.blit(self.text,self.text_rect)  

The size of text_surface is (400, 100), but the center of self.text_rect is (600, 400).

If you do

self.text_surface_rect.center = self.setting.screen_rect.center

[...]

self.text_rect.center = self.text_surface_rect.center

then self.text_surface_rect has a location which is far out of the bounds of self.text_surface. The center of the screen (self.setting.screen_rect.center) is (600, 400). But the size of text_surface is (400, 100).

+--------------+
| text_surface |
+--------------+ 
                size: (400, 100)

                      +----------+
                      | text_rect| center: (600, 400)
                      +----------+

---

Note text_surface_rect is (400, 350, 400, 100), but text_surface is a Surface object and has no location it has just a size of (400, 100). You can think about it as a rectangle (0, 0, 400, 100).
The text is blit on text_surface not on text_surface_rect.

---

You have to compute the location relative to self.button_surface_rect, rather than self.setting.screen:

self.text_surface_rect.center = (self.setting.screen_rect.centerx - self.button_surface_rect.x,
                                 self.setting.screen_rect.centery - self.button_surface_rect.y)

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