python基于pygame实现响应游戏中事件的方法(附源码)

#handle the key event
import pygame
from pygame.locals import *
from sys import exit
'''
  事件             产生途径              参数
  QUIT         用户按下关闭按钮          none
  ATIVEEVENT         Pygame被激活或者隐藏          gain, state
  KEYDOWN         键盘被按下              unicode, key, mod
  KEYUP         键盘被放开              key, mod
  MOUSEMOTION         鼠标移动              pos, rel, buttons
  MOUSEBUTTONDOWN     鼠标按下              pos, button
  MOUSEBUTTONUP     鼠标放开              pos, button
  JOYAXISMOTION     游戏手柄(Joystick or pad)移动      joy, axis, value
  JOYBALLMOTION     游戏球(Joy ball)?移动      joy, axis, value
  JOYHATMOTION     游戏手柄(Joystick)?移动      joy, axis, value
  JOYBUTTONDOWN     游戏手柄按下              joy, button
  JOYBUTTONUP         游戏手柄放开              joy, button
  VIDEORESIZE         Pygame窗口缩放          size, w, h
  VIDEOEXPOSE         Pygame窗口部分公开(expose)      none
  USEREVENT         触发了一个用户事件          code
'''
__author__ = {'name' : 'Hongten',
       'mail' : 'hongtenzone@foxmail.com',
       'QQ'  : '648719819',
       'Version' : '1.0'}
BG_IMAGE = 'C:\\py\\ball.png'
pygame.init()
screen = pygame.display.set_mode((500, 500), 0, 32)
bg = pygame.image.load(BG_IMAGE).convert()
x, y = 0, 0
move_x, move_y = 0, 0
while 1:
  for event in pygame.event.get():
    #print(event.type)
    if event.type == QUIT:
      exit()
    if event.type == KEYDOWN:
      print(event.key)
      #event.key返回的是一个数字值，而K_LEFT,K_UP,K_RIGHT,K_DOWN等都是常量，
      #他们代表的也是一个数字值，这些数字值可以用：print(event.key)获取到
      #如：K_LEFT = 276
      #  K_UP = 273
      #所以下面的代码可以替换为：
      #if event.key == 276:
      #  move_x = -10
      if event.key == K_LEFT:
        move_x = -10
      elif event.key == K_UP:
        move_y = -10
      elif event.key == K_RIGHT:
        move_x = 10
      elif event.key == K_DOWN:
        move_y = 10
    elif event.type == KEYUP:
      move_x = 0
      move_y = 0
    x += move_x
    y += move_y
    #print(x, y)
    screen.fill((0, 0, 0))
    screen.blit(bg, (x, y))
    pygame.display.update()