用户交互----进入游戏
一、增加交互----点击和拖动
1、点击鼠标画点的程序
设置
import pygame # Setup
pygame.init()
screen = pygame.display.set_mode([800,600])
pygame.display.set_caption("单击画圆点")
keep_going = True
RED = (255,0,0) # RGB color triplet for RED
radius = 15在游戏循环中处理鼠标点击事件
while keep_going: # Game loop
for event in pygame.event.get(): # Handling events
if event.type == pygame.QUIT:
keep_going = False
if event.type == pygame.MOUSEBUTTONDOWN:
spot = event.pos
pygame.draw.circle(screen, RED, spot, radius)更新屏幕以及退出时要干嘛并整合
# ClickDots.py
import pygame # Setup
pygame.init()
screen = pygame.display.set_mode([800,600])
pygame.display.set_caption("单击画圆点")
keep_going = True
RED = (255,0,0) # RGB color triplet for RED
radius = 15
while keep_going: # Game loop
for event in pygame.event.get(): # Handling events
if event.type == pygame.QUIT:
keep_going = False
if event.type == pygame.MOUSEBUTTONDOWN:
spot = event.pos
pygame.draw.circle(screen, RED, spot, radius)
pygame.display.update() # Update display
pygame.quit() # Exit2、拖动绘制连续的圆点的程序
拖动的特点是鼠标在按下的同时鼠标在移动。
该程序的总体结构与上面相同，故直接给出代码：
# DragDots.py
import pygame # Setup
pygame.init()
screen = pygame.display.set_mode([800,600])
pygame.display.set_caption("Click and drag to draw")
keep_going = True
YELLOW = (255,255,0) # RGB color triplet for YELLOW
radius = 15
mousedown = False
while keep_going: # Game loop
for event in pygame.event.get(): # Handling events
if event.type == pygame.QUIT:
keep_going = False
if event.type == pygame.MOUSEBUTTONDOWN:
mousedown = True
if event.type == pygame.MOUSEBUTTONUP:
mousedown = False
if mousedown: # Draw/update graphics
spot = pygame.mouse.get_pos()
pygame.draw.circle(screen, YELLOW, spot, radius)
pygame.display.update() # Update display
pygame.quit() # Exit二、高级交互----笑脸爆炸
1、笑脸精灵
在屏幕上移动的图形化对象叫精灵，因为它们在背景上漂移。
Pygame的pygame.sprite.Sprite类支持精灵图形。
对象是一个特定类的实例。
每个类都可以有自己的方法、属性和数据。
面向对象编程需要将问题或程序分解为对象，然后构建创建这些对象的类。
代码重用的一个情况是多个程序都用上了某个类。
Group是一个容器类，允许我们将Sprite对象作为一组存储在一起。
笑脸精灵类如下：
class Smiley(pygame.sprite.Sprite):
pos = (0,0)
xvel = 1 #笑脸的水平速度
yvel = 1 #笑脸的垂直速度
scale = 100 #笑脸的大小我们的Smiley类定义以关键字class开始，后面跟着想要的类名以及要扩展的类型。
笑脸爆炸程序的设置部分：
# SmileyExplosion.py
import pygame
import random
BLACK = (0,0,0)
pygame.init()
screen = pygame.display.set_mode([800,600])
pygame.display.set_caption("Smiley Explosion")
mousedown = False
keep_going = True
clock = pygame.time.Clock()
pic = pygame.image.load("CrazySmile.bmp")
colorkey = pic.get_at((0,0))
pic.set_colorkey(colorkey)
sprite_list = pygame.sprite.Group()2、设置精灵
在初始化方法也叫构造方法中设置精灵：
def __init__(self, pos, xvel, yvel):
# Call the parent class (Sprite) constructor
#pygame.sprite.Sprite.__init__(self)
super().__init__()
self.image = pic
#self.scale = random.randrange(10,100)
#self.image = pygame.transform.scale(self.image, (self.scale,self.scale))
self.rect = self.image.get_rect()
self.pos = pos #把鼠标的位置作为精灵的位置
self.rect.x = pos[0] - self.scale/2 #这行和下一行，使笑脸的中心位于鼠标位置
self.rect.y = pos[1] - self.scale/2
self.xvel = xvel
self.yvel = yvel3、更新精灵
更新精灵的位置，重写精灵的update方法：
def update(self):
self.rect.x += self.xvel
self.rect.y += self.yvel
if self.rect.x <= 0 or self.rect.x > screen.get_width() - self.scale:
self.xvel = -self.xvel
if self.rect.y <= 0 or self.rect.y > screen.get_height() - self.scale:
self.yvel = -self.yvel4、较大和较小的笑脸
在构造方法里，我们将笑脸精灵的大小设置为10到100像素：
self.scale = random.randrange(10,100)
self.image = pygame.transform.scale(self.image, (self.scale,self.scale))
5、整合
# SmileyExplosion.py
import pygame
import random
BLACK = (0,0,0)
pygame.init()
screen = pygame.display.set_mode([800,600])
pygame.display.set_caption("Smiley Explosion")
mousedown = False
keep_going = True
clock = pygame.time.Clock()
pic = pygame.image.load("CrazySmile.bmp")
colorkey = pic.get_at((0,0))
pic.set_colorkey(colorkey)
sprite_list = pygame.sprite.Group()
class Smiley(pygame.sprite.Sprite):
pos = (0,0)
xvel = 1
yvel = 1
scale = 100
def __init__(self, pos, xvel, yvel):
super().__init__()
self.image = pic
self.scale = random.randrange(10,100)
self.image = pygame.transform.scale(self.image, (self.scale,self.scale))
self.rect = self.image.get_rect()
self.pos = pos
self.rect.x = pos[0] - self.scale/2
self.rect.y = pos[1] - self.scale/2
self.xvel = xvel
self.yvel = yvel
def update(self):
self.rect.x += self.xvel
self.rect.y += self.yvel
if self.rect.x <= 0 or self.rect.x > screen.get_width() - self.scale:
self.xvel = -self.xvel
if self.rect.y <= 0 or self.rect.y > screen.get_height() - self.scale:
self.yvel = -self.yvel
while keep_going:
for event in pygame.event.get():
if event.type == pygame.QUIT:
keep_going = False
if event.type == pygame.MOUSEBUTTONDOWN:
mousedown = True
if event.type == pygame.MOUSEBUTTONUP:
mousedown = False
screen.fill(BLACK)
sprite_list.update()
sprite_list.draw(screen)
clock.tick(60)
pygame.display.update()
if mousedown:
speedx = random.randint(-5, 5)
speedy = random.randint(-5, 5)
newSmiley = Smiley(pygame.mouse.get_pos(),speedx,speedy)
sprite_list.add(newSmiley)
pygame.quit()