Python Pygame：如何正确使用 get_rect()
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/42577197/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Pygame: How to correctly use get_rect()
提问by henrco
I'm trying to understand how get_rect()works. In this simple example, I have two images and want to obtain the location of the second and move the first image to the second image.
我试图了解如何get_rect()工作。在这个简单的例子中，我有两个图像，想要获取第二个图像的位置并将第一个图像移动到第二个图像。
I have looked at a variety of examples online and cannot get this to work. What am I doing wrong?
我在网上查看了各种示例，但无法使其正常工作。我究竟做错了什么？
import pygame, sys
from pygame.locals import *
import time
pygame.init()
FPS = 10 # frames per second setting
fpsClock = pygame.time.Clock()
# Set up the window
DISPLAYSURF = pygame.display.set_mode((600, 400), 0, 32)
pygame.display.set_caption('Test program for get_rect()')
WHITE = (255, 255, 255)
# Load two images
baseImg = pygame.image.load('image1.jpg')
spaceshipImg = pygame.image.load('image2.jpg')
DISPLAYSURF.fill(WHITE)
# Place one image at the bottom of the screen
DISPLAYSURF.blit(baseImg, (300, 300))
pygame.display.update()
# Place the second image at the top of the screen
DISPLAYSURF.blit(spaceshipImg, (300, 0))
pygame.display.update()
# Wait for one second
time.sleep(1)
# Obtain the rectangle for each image
baseRect = baseImg.get_rect()
spaceshipRect = spaceshipImg.get_rect()
# This is where I believe I'm going wrong
# I understand this to obtain the x,y of the spaceship image
# Set the xy coordinates for the top image to the xy of the bottom image
spaceshipRect.x = baseRect.x
spaceshipRect.y = baseRect.y
# Move the top image to new xy position
# However this doesn't work
DISPLAYSURF.blit(spaceshipImg, (spaceshipRect.x, spaceshipRect.y))
pygame.display.update()
while True:
for event in pygame.event.get():
if event.type == QUIT:
pygame.quit()
sys.exit()
回答by skrx
First, images/pygame.Surfaces don't have a position, so you have to store the blit position in the rect. When you call the get_rectmethod of a pygame.Surface, Pygame creates a new rect with the size of the image and the x, y coordinates (0, 0). To give the rect other coords during the instantiation you can pass an argument to get_rect, mostly centeror topleftis used. To move the rect later, you can change any of these attributes of the rect:
首先，images/pygame.Surfaces 没有位置，因此您必须将 blit 位置存储在矩形中。当您调用get_rectpygame.Surface的方法时，Pygame 会使用图像的大小和 x、y 坐标 (0, 0) 创建一个新矩形。要在实例化期间为 rect 提供其他坐标，您可以将参数传递给 get_rect，主要是使用center或topleft使用。要稍后移动 rect，您可以更改 rect 的以下任何属性：
x,y
top, left, bottom, right
topleft, bottomleft, topright, bottomright
midtop, midleft, midbottom, midright
center, centerx, centery
size, width, height
w,h
Here's an example (press a or d to change the position of the rect and thereby the blit pos of the image):
这是一个示例（按 a 或 d 更改矩形的位置，从而更改图像的 blit 位置）：
import sys
import pygame as pg
BG_COLOR = pg.Color(80, 60, 70)
PLAYER_COLOR = pg.Color(90, 140, 190)
def main():
screen = pg.display.set_mode((640, 480))
clock = pg.time.Clock()
player_img = pg.Surface((40, 60))
player_img.fill(PLAYER_COLOR)
# Create a rect with the size of the image/pygame.Surface
# and immediately set it's topleft coords to (100, 300).
player_rect = player_img.get_rect(topleft=(100, 300))
done = False
while not done:
for event in pg.event.get():
if event.type == pg.QUIT:
done = True
if event.type == pg.KEYDOWN:
if event.key == pg.K_d:
# Set the center to these new coords.
player_rect.center = (400, 200)
if event.key == pg.K_a:
# Set the x coord to 300.
player_rect.x = 300
screen.fill(BG_COLOR)
screen.blit(player_img, player_rect)
pg.display.flip()
clock.tick(30)
if __name__ == '__main__':
pg.init()
main()
pg.quit()
sys.exit()
