Python – 在 PyGame 中移动对象

Pygame 是一组用于编写视频游戏的跨平台Python模块。它包括旨在与Python编程语言一起使用的计算机图形和声音库。现在，这取决于开发者的想象力或必要性，他/她想使用这个工具包开发什么类型的游戏。

在本教程中，我们将学习如何移动对象，使其在按下键盘上的右箭头键或左箭头键时水平移动，并在按下向上箭头键或向下箭头键时垂直移动。

这样做的主要概念是通过更改对象的坐标并刷新屏幕。每次刷新屏幕时，窗口颜色都会被原始颜色填充并形成新的矩形，因此当按下箭头键时，坐标会发生变化，并且看起来对象正在移动。

Change in Co-ordinates for respective keys pressed :

Left arrow key: Decrement in x co-ordinate
Right arrow key: Increment in x co-ordinate
Up arrow key: Decrement in y co-ordinate
Down arrow key: Increment in y co-ordinate

下面是实现。

# import pygame module in this program 
import pygame
  
# activate the pygame library .  
# initiate pygame and give permission  
# to use pygame's functionality.  
pygame.init()
  
# create the display surface object  
# of specific dimension..e(500, 500).  
win = pygame.display.set_mode((500, 500))
  
# set the pygame window name 
pygame.display.set_caption("Moving rectangle")
  
# object current co-ordinates 
x = 200
y = 200
  
# dimensions of the object 
width = 20
height = 20
  
# velocity / speed of movement
vel = 10
  
# Indicates pygame is running
run = True
  
# infinite loop 
while run:
    # creates time delay of 10ms 
    pygame.time.delay(10)
      
    # iterate over the list of Event objects  
    # that was returned by pygame.event.get() method.  
    for event in pygame.event.get():
          
        # if event object type is QUIT  
        # then quitting the pygame  
        # and program both.  
        if event.type == pygame.QUIT:
              
            # it will make exit the while loop 
            run = False
    # stores keys pressed 
    keys = pygame.key.get_pressed()
      
    # if left arrow key is pressed
    if keys[pygame.K_LEFT] and x>0:
          
        # decrement in x co-ordinate
        x -= vel
          
    # if left arrow key is pressed
    if keys[pygame.K_RIGHT] and x<500-width:
          
        # increment in x co-ordinate
        x += vel
         
    # if left arrow key is pressed   
    if keys[pygame.K_UP] and y>0:
          
        # decrement in y co-ordinate
        y -= vel
          
    # if left arrow key is pressed   
    if keys[pygame.K_DOWN] and y<500-height:
        # increment in y co-ordinate
        y += vel
         
              
    # completely fill the surface object  
    # with black colour  
    win.fill((0, 0, 0))
      
    # drawing object on screen which is rectangle here 
    pygame.draw.rect(win, (255, 0, 0), (x, y, width, height))
      
    # it refreshes the window
    pygame.display.update() 
  
# closes the pygame window 
pygame.quit()