'''
  事件             產(chǎn)生途徑              參數(shù)
  QUIT            用戶按下關(guān)閉按鈕          none
  ATIVEEVENT         Pygame被激活或者隱藏          gain, state
  KEYDOWN          鍵盤被按下              unicode, key, mod
  KEYUP           鍵盤被放開              key, mod
  MOUSEMOTION        鼠標(biāo)移動(dòng)              pos, rel, buttons
  MOUSEBUTTONDOWN      鼠標(biāo)按下              pos, button
  MOUSEBUTTONUP       鼠標(biāo)放開              pos, button
  JOYAXISMOTION       游戲手柄(Joystick or pad)移動(dòng)      joy, axis, value
  JOYBALLMOTION       游戲球(Joy ball)?移動(dòng)      joy, axis, value
  JOYHATMOTION        游戲手柄(Joystick)?移動(dòng)      joy, axis, value
  JOYBUTTONDOWN       游戲手柄按下              joy, button
  JOYBUTTONUP        游戲手柄放開              joy, button
  VIDEORESIZE        Pygame窗口縮放          size, w, h
  VIDEOEXPOSE        Pygame窗口部分公開(expose)      none
  USEREVENT         觸發(fā)了一個(gè)用戶事件          code
'''

#handle the key event
import pygame
from pygame.locals import *
from sys import exit
'''
  事件             產(chǎn)生途徑              參數(shù)
  QUIT         用戶按下關(guān)閉按鈕          none
  ATIVEEVENT         Pygame被激活或者隱藏          gain, state
  KEYDOWN         鍵盤被按下              unicode, key, mod
  KEYUP         鍵盤被放開              key, mod
  MOUSEMOTION         鼠標(biāo)移動(dòng)              pos, rel, buttons
  MOUSEBUTTONDOWN     鼠標(biāo)按下              pos, button
  MOUSEBUTTONUP     鼠標(biāo)放開              pos, button
  JOYAXISMOTION     游戲手柄(Joystick or pad)移動(dòng)      joy, axis, value
  JOYBALLMOTION     游戲球(Joy ball)?移動(dòng)      joy, axis, value
  JOYHATMOTION     游戲手柄(Joystick)?移動(dòng)      joy, axis, value
  JOYBUTTONDOWN     游戲手柄按下              joy, button
  JOYBUTTONUP         游戲手柄放開              joy, button
  VIDEORESIZE         Pygame窗口縮放          size, w, h
  VIDEOEXPOSE         Pygame窗口部分公開(expose)      none
  USEREVENT         觸發(fā)了一個(gè)用戶事件          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返回的是一個(gè)數(shù)字值，而K_LEFT,K_UP,K_RIGHT,K_DOWN等都是常量，
      #他們代表的也是一個(gè)數(shù)字值，這些數(shù)字值可以用：print(event.key)獲取到
      #如：K_LEFT = 276
      #  K_UP = 273
      #所以下面的代碼可以替換為：
      #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()