Pygame事件处理机制

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Pygame事件处理机制

事件处理需求

  • • 响应用户键盘、鼠标等外设操作
  • • 响应屏幕尺寸和模式变化
  • • 响应游戏情节的特定触发条件
  • • 产生一些触发条件

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键盘事件及类型的使用

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鼠标事件及类型的使用

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# Unit PYG04: Pygame Event Print v1
import pygame,sys
 
pygame.init()
screen = pygame.display.set_mode((600, 400))
pygame.display.set_caption("Pygame事件处理")
 
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            if event.unicode == "":
                print("[KEYDOWN]:", "#", event.key, event.mod)
            else:
                print("[KEYDOWN]:", event.unicode, event.key, event.mod)
        elif event.type == pygame.MOUSEMOTION:
            print("[MOUSEMOTION]:", event.pos, event.rel, event.buttons)
        elif event.type == pygame.MOUSEBUTTONUP:
            print("[MOUSEBUTTONUP]:", event.pos, event.button)
        elif event.type == pygame.MOUSEBUTTONDOWN:
            print("[MOUSEBUTTONDOWN]:", event.pos, event.button)
 
    pygame.display.update()

壁球小游戏（鼠标型）

  • 鼠标左键按下
    左键按下拖拽小球

  • 鼠标左键释放
    左键释放小球继续运动

  • 局部处理
    增加一种交互方式要考虑
    额外的局部处理
    游戏逻辑的调试 

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# Unit PYG03: Pygame Wall Ball Game version 8  鼠标型
import pygame,sys
 
pygame.init()
size = width, height = 600, 400
speed = [1,1]
BLACK = 0, 0, 0
screen = pygame.display.set_mode(size, pygame.RESIZABLE)  #窗口大小可调
 
icon = pygame.image.load("PYG03-flower.png")
pygame.display.set_icon(icon)
pygame.display.set_caption("Pygame壁球")
ball = pygame.image.load("PYG02-ball.gif")
ballrect = ball.get_rect()
fps = 300
fclock = pygame.time.Clock()
still = False
 
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                speed[0] = speed[0] if speed[0] == 0 else (abs(speed[0]) - 1)*int(speed[0]/abs(speed[0]))
            elif event.key == pygame.K_RIGHT:
                speed[0] = speed[0] + 1 if speed[0] > 0 else speed[0] - 1
            elif event.key == pygame.K_UP:
                speed[1] = speed[1] + 1 if speed[1] > 0 else speed[1] - 1
            elif event.key == pygame.K_DOWN:
                speed[1] = speed[1] if speed[1] == 0 else (abs(speed[1]) - 1)*int(speed[1]/abs(speed[1]))
            elif event.key == pygame.K_ESCAPE:
                sys.exit()
        elif event.type == pygame.VIDEORESIZE:
            size = width, height = event.size[0], event.size[1]
            screen = pygame.display.set_mode(size, pygame.RESIZABLE)
        elif event.type == pygame.MOUSEBUTTONDOWN:
            if event.button == 1:
                still = True
        elif event.type == pygame.MOUSEBUTTONUP:
            still = False
            if event.button == 1:
                ballrect = ballrect.move(event.pos[0] - ballrect.left, event.pos[1] - ballrect.top)
        elif event.type == pygame.MOUSEMOTION:
            if event.buttons[0] == 1:
                ballrect = ballrect.move(event.pos[0] - ballrect.left, event.pos[1] - ballrect.top)
    if pygame.display.get_active() and not still:
        ballrect = ballrect.move(speed)
    if ballrect.left < 0 or ballrect.right > width:
        speed[0] = - speed[0]
        if ballrect.right > width and ballrect.right + speed[0] > ballrect.right:
            speed[0] = - speed[0]
    if ballrect.top < 0 or ballrect.bottom > height:
        speed[1] = - speed[1]
        if ballrect.bottom > height and ballrect.bottom + speed[1] > ballrect.bottom:
            speed[1] = - speed[1]
 
    screen.fill(BLACK)
    screen.blit(ball, ballrect)
    pygame.display.update()
    fclock.tick(fps)

Pygame事件处理函数

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# Unit PYG04: Pygame Event Post
import pygame,sys
 
pygame.init()
screen = pygame.display.set_mode((600, 400))
pygame.display.set_caption("Pygame事件处理")
fps = 1
fclock = pygame.time.Clock()
num = 1
 
while True:
    uevent = pygame.event.Event(pygame.KEYDOWN, {"unicode": 123, "key":pygame.K_SPACE, "mod":pygame.KMOD_ALT})
    pygame.event.post(uevent)
    num = num + 1
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            if event.unicode == "":
                print("[KEYDOWN {}]:".format(num), "#", event.key, event.mod)
            else:
                print("[KEYDOWN {}]:".format(num), event.unicode, event.key, event.mod)
 
    pygame.display.update()
    fclock.tick(fps)
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