1. pygame事件

import pygame

if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((800, 600))
    screen.fill((255, 255, 255))
    # 设置窗口标题
    pygame.display.set_caption('游戏事件')

    pygame.display.flip()

QUIT：关闭按钮被点击事件
MOUSEBUTTONDOWN：鼠标按下事件
MOUSEBUTTONUP：鼠标弹起事件
MOUSEMOTION：鼠标移动事件
鼠标相关事件关心事件产生的位置
KEYDOWN：键盘按钮被按下
KEYUP：键盘按钮弹起

    while True:
        # 每次循环检测有没有事件发生
        for event in pygame.event.get():
            # 不同类型的事件对应的type值不一样
            if event.type == pygame.QUIT:
                exit()
            # 鼠标相关事件
            # pos属性，获取鼠标事件产生的位置
            if event.type == pygame.MOUSEBUTTONDOWN:
                print('鼠标按下', event.pos)
            if event.type == pygame.MOUSEBUTTONUP:
                print('鼠标弹起', event.pos)
            if event.type == pygame.MOUSEMOTION:
                print('鼠标移动', event.pos)

            # 键盘相关事件
            # key属性，被按的按键对应的值的编码
            if event.type == pygame.KEYDOWN:
                print('键盘按键被按下', chr(event.key))

            if event.type == pygame.KEYUP:
                print('键盘按钮弹起', chr(event.key))

2. 鼠标事件的应用

import pygame
from random import randint
def rand_color():
    # 产生随机颜色
    return (randint(0, 255), randint(0, 255), randint(0, 255))

def draw_ball(screen, pos):
    pygame.draw.circle(screen, rand_color(), pos, randint(10, 20))
    # 只要屏幕上的内容有更新，都需要调用下面这两个方法的一种
    # pygame.display.flip()
    pygame.display.update()

# 写一个函数，判断指定的点是否在指定的矩形范围中
def is_in(point, rect):
    x, y = point
    rx, ry, rw, rh = rect
    if (rx <= x <= rx + rw) and (ry <= y <= ry + rh):
        return True
    return False

# 写一个函数，画一个按钮
def draw_button(sceen, btn_color, title_color):
    """矩形框"""
    pygame.draw.rect(screen, btn_color, (300, 300, 130, 80))
    """文字"""
    font = pygame.font.SysFont('华文隶书', 30)
    title = font.render('小菜鸡', True, title_color)
    screen.blit(title, (320, 320))



if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((800, 600))
    screen.fill((0, 0, 0))
    pygame.display.set_caption('鼠标事件')

    # 画个按钮
    draw_button(screen, (255, 255, 0), (0, 0, 255))
    # """矩形框"""
    # pygame.draw.rect(screen, (255, 255, 0), (300, 300, 130, 80))
    # """文字"""
    # font = pygame.font.SysFont('华文隶书', 30)
    # title = font.render('小菜鸡', True, (0, 0, 255))
    # screen.blit(title, (320, 320))



    pygame.display.flip()

    while True:
        for event in pygame.event.get():
            # 退出
            if event.type == pygame.QUIT:
                exit()

            if event.type == pygame.MOUSEBUTTONDOWN:
                # 在指定的坐标处画一个球
                # draw_ball(screen, event.pos)
                if is_in(event.pos, (300, 300, 130, 80)):
                    draw_button(screen, (255, 0, 0), (255, 255, 255))
                    pygame.display.flip()

            if event.type == pygame.MOUSEBUTTONUP:
                if is_in(event.pos, (300, 300, 130, 80)):
                    draw_button(screen, (255, 255, 0), (0, 0, 255))
                    pygame.display.update()

            if event.type == pygame.MOUSEMOTION:
                screen.fill((0, 0, 0))
                draw_button(screen, (255, 255, 0), (0, 0, 255))
                draw_ball(screen, event.pos)

3. 鼠标事件的应用

# 要求，先在屏幕上显示一张图片，鼠标按下移动的时候，拽着图片跟着一起动。鼠标弹起就不动了
import pygame

# 写一个函数，判断一个点是否在某个范围内
def is_in_rect(pos, rect):
    x, y = pos
    rx, ry, rw, rh = rect
    if (rx <= x <= rx + rw) and (ry <= y <= ry + rh):
        return True
    return False


if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((800, 600))
    screen.fill((0, 0, 0))
    pygame.display.set_caption('图片移动')
    # 显示一张图片
    image = pygame.image.load('./3.png')
    image_x = 100
    image_y = 100
    screen.blit(image, (image_x, image_y))



    pygame.display.flip()

    # 用来存储图片是否可以移动
    is_move = False

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                exit()

            # 鼠标按下，让状态变成可以移动
            if event.type == pygame.MOUSEBUTTONDOWN:
                w,h = image.get_size()
                if is_in_rect(event.pos, (image_x, image_y, w, h)):
                    is_move = True

            # 鼠标弹起，状态不可移动
            if event.type == pygame.MOUSEBUTTONUP:
                is_move = False


            # 鼠标移动对应的事件
            if event.type == pygame.MOUSEMOTION:
                if is_move:
                    screen.fill((0, 0, 0))
                    x, y = event.pos
                    image_w, image_h = image.get_size()
                    # 保证鼠标在图片中心
                    image_y = y - image_h/2
                    image_x = x - image_w/2
                    screen.blit(image, (image_x, image_y))
                    pygame.display.update()

4. 动画效果

"""
动画原理：不断地刷新界面上的内容（一帧一帧的画）
"""
import pygame
from random import randint

def static_page(screen):
    """
    页面上的静态内容
    """
    # 静态文字
    font = pygame.font.SysFont('华文隶书', 40)
    title = font.render('小辣鸡', True, (255, 255, 0))
    screen.blit(title, (200, 200))

def animation_title(screen):
    """
    字体颜色发生改变
    """
    font = pygame.font.SysFont('华文隶书', 40)
    title = font.render('小辣鸡', True, (randint(0, 255), randint(0, 255), randint(0, 255)))
    screen.blit(title, (300, 300))

if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((800, 600))
    screen.fill((0, 0, 0))
    pygame.display.set_caption('动画')

    static_page(screen)

    pygame.display.flip()

    while True:
        # for循环里面的代码只有事件发生后才会执行
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                exit()

        # 在下边写每一帧要显示的内容
        """程序执行到这个位置，CPU休息一段时间再执行后面的代码（线程在这儿阻塞指定的时间）
        单位：毫秒  1000ms = 1s
        """
        pygame.time.delay(500)
        # 动画前要将原来的内容全部清空
        screen.fill((0, 0, 0))

        static_page(screen)
        animation_title(screen)
        # 内容展示完成后，要更新到屏幕上
        pygame.display.update()

5. 小球游戏

import pygame

def draw_ball(place, color, pos):
    """
    画球
    """
    pygame.draw.circle(place, color, pos, 20)

# 方向键对应的值
Up = 119
Left = 97
Down = 115
Right = 100

if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((800, 600))
    screen.fill((0, 0, 0))
    pygame.display.set_caption('球移动')




    pygame.display.flip()

    # 保存初始坐标
    ball_x = 100
    ball_y = 100
    x_speed = 1
    y_speed = 0

    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                exit()

            if event.type == pygame.KEYDOWN:
                if event.key == Up:
                    y_speed = -5
                    x_speed = 0
                elif event.key == Down:
                    y_speed = 5
                    x_speed = 0
                elif event.key == Left:
                    x_speed = -5
                    y_speed = 0
                elif event.key == Right:
                    x_speed = 5
                    y_speed = 0

        # 刷新屏幕
        screen.fill((0, 0, 0))
        # 每次循环让球的x和y变化
        pygame.time.delay(10)
        ball_x += x_speed
        ball_y += y_speed
        if ball_x + 20 >= 800 or ball_x - 20 <= 0 or ball_y + 20 >= 600 or ball_y - 20 <= 0:
            print('死求了')
            exit()
        if ball_x + 20 >= 800:
            ball_x = 800 -20
            x_speed = -1
        if ball_x - 20 <= 0:
            ball_x = 20
            x_speed = 1
        if ball_y + 20 >= 600:
            ball_y = 600 - 20
            y_speed = -1
        if ball_y - 20 <= 0:
            ball_y = 20
            y_speed = 1
        draw_ball(screen, (255, 255, 0), (ball_x, ball_y))

        pygame.display.update()