Python – 在 PyGame 中使用箭头键进行绘图设计

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。

在本文中，我们将了解如何在 PyGame 中借助按键进行设计，例如当按下键盘上的右箭头键或左箭头键时标记水平移动，按下向上箭头键或向下箭头键时标记垂直移动.我们可以通过在各自的坐标上做一个点（标记）来做到这一点，它在键的帮助下得到改变。

Change in Co-ordinates of marker 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")
  
# marker current co-ordinates  
x = 200
y = 200
  
# dimensions of the marker 
width = 10
height = 10
  
# 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
  
  
    # drawing spot 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() 

输出 ：