1.pygame事件

QUIT:关闭按钮被点击事件

 if event.type == pygame.QUIT:
    exit()

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
if event.type == pygame.MOUSEBUTTONDOWN:
   print('鼠标按下')

if event.type == pygame.MOUSEBUTTONUP:
   print('鼠标弹起')

if event.type == pygame.MOUSEMOTION:
   print('鼠标移动')

KEYDOWN:键盘按键被按下事件
KEYUP:键盘按钮弹起事件

# 键盘相关事件
 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

2.1.鼠标点击的地方画圆

import pygame
from random import randint

def rand_color():
    """
    产生随机颜色
    """
    return (randint(1, 255), randint(1, 255), randint(1, 255))

def draw_circle(screen, pos):
    """
    在鼠标点击的位置画球
    """
    pygame.draw.circle(screen, rand_color(), pos, randint(10, 40))
    # 只要屏幕上的内容有更新，都需要调用下面这两个方法中的一个
    # pygame.display.flip()
    pygame.display.update()
if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((600, 400))
    screen.fill((254, 254, 254))
    pygame.display.set_caption('鼠标事件')

    # 画个按钮
    draw_button(screen, (0, 254, 0), (254, 0, 0))

    pygame.display.flip()

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

            if event.type == pygame.MOUSEBUTTONDOWN:
                # 在指定坐标画圆
                draw_circle(screen, event.pos)

2.2.画按钮并实现点击变色功能

# 写一个函数，判断指定的点是否在矩形框中
def is_in_rect(point, rect):
    x, y = point
    rx, ry, rw, rh = rect
    if rx <= x <= (rx + rw) and ry <= y <= (ry + rh):
        return True

# 写一个函数，画一个按钮
def draw_button(screen, btn_color, title_color):
    # 画个按钮
    """矩形框"""
    pygame.draw.rect(screen, btn_color, (100, 100, 100, 60))
    """文字"""
    font = pygame.font.SysFont('Times', 20)
    title = font.render('button', True, title_color)
    screen.blit(title, (120, 120))
       
if __name__='__main__':
... #重复pygame中的步骤
    while True:
        for event in pygame.event.get():
            # 退出
            if event.type == pygame.QUIT:
                exit()

            if event.type == pygame.MOUSEBUTTONDOWN:
                # 在指定坐标画圆
                # draw_circle(screen, event.pos)

                if is_in_rect(event.pos, (100, 100, 100, 60)):
                    draw_button(screen, (0, 200, 0), (100, 0, 0))
                    pygame.display.flip()

            # 鼠标点击按钮
            if event.type == pygame.MOUSEBUTTONUP:
                if is_in_rect(event.pos, (100, 100, 100, 60)):
                    draw_button(screen, (0, 254, 0), (254, 0, 0))
                    pygame.display.update()

2.3.鼠标移动画圆

            if event.type == pygame.MOUSEMOTION:
                screen.fill((254, 254, 254))
                draw_button(screen, (0, 254, 0), (254, 0, 0))
                draw_circle(screen, event.pos)

2.3.鼠标拖拽

import pygame
# 要求：先在屏幕上显示一张图片，鼠标按下移动的时候，拽着图片跟着鼠标移动，鼠标弹起后就不动了

# 写一个函数，判断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((1000, 800))
    screen.fill((254, 254, 254))
    pygame.display.set_caption('图片拖拽')

    image = pygame.image.load('./lufei.jpg')

    image_x, image_y = 0, 0
    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，让状态变成不可以移动
            if event.type == pygame.MOUSEBUTTONUP:
                is_move = False

            if event.type == pygame.MOUSEMOTION:
                if is_move:
                    screen.fill((254, 254, 254))
                    x, y = event.pos
                    image_w, image_h = image.get_size()
                    image_x = x-image_w/2
                    image_y = y-image_h/2
                    screen.blit(image, (x-image_w/2, y-image_h/2))
                    pygame.display.update()

3.动画效果

动画原理：不断的刷新界面上的内容(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('Times', 40)
    title = font.render('Welcome', True, (254, 0, 0))
    screen.blit(title, (100, 200))

def animation_title():
    """
    字体颜色发生改变
    """
    font = pygame.font.SysFont('Times', 40)
    title = font.render('Python', True, (randint(1, 255), randint(1, 255), randint(1, 255)))
    screen.blit(title, (280, 200))

if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((600, 400))
    screen.fill((254, 254, 254))
    static_page(screen)

    pygame.display.flip()

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

        # 在下面去写每一帧要显示的内容
        """
        程序执行到这个位置，线程在这阻塞指定的时间
        单位：毫秒 (1000ms = 1s)
        """
        pygame.time.delay(1000)
        # 动画前清空原来的内容
        screen.fill((254, 254, 254))
        static_page(screen)
        animation_title()

        pygame.display.update()

多个球一起动

"""__author__=xx"""
import pygame
from random import randint
from math import sqrt

# 写一个函数，判断两个球是否相遇
def is_ball_meet(ball_1, ball_2):
    x1, y1 = ball_1['pos']
    r1 = ball_1['r']
    x2, y2 = ball_2['pos']
    r2 = ball_2['r']
    if (r1 + r2) > sqrt((x1-x2)**2 + (y1-y2)**2):
        return True
    return False

if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((600, 400))
    screen.fill((254,254,254))
    pygame.display.flip()

    # all_balls中保存多个球
    # 每个球要保存：半径、圆心、颜色、x速度、y速度
    all_balls = []


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

            if event.type == pygame.MOUSEBUTTONDOWN:
                ball_dict1 = {'r':randint(10,30), 'pos':event.pos, 'color':(randint(1,255),randint(1,255),randint(1,255)), 'x_speed':randint(-5,5), 'y_speed':randint(-5,5)}
                all_balls.append(ball_dict1)


        # 刷新界面
        screen.fill((254,254,254))
        pygame.time.delay(100)

        for ball_dict in all_balls:

            # 取出球原来的x坐标和y坐标以及速度
            x,y = ball_dict['pos']
            x_speed = ball_dict['x_speed']
            y_speed = ball_dict['y_speed']
            x += x_speed
            y += y_speed
            r = ball_dict['r']
            if x - r <= 0:
                x = r
                x_speed = 5
            if x + r >= 600:
                x = 600 - r
                x_speed = -5
            if y - r <= 0:
                y = r
                y_speed = 7
            if y + r >= 400:
                y = 400 - r
                y_speed = -7
            pygame.draw.circle(screen,ball_dict['color'],(x,y),r)
            # 更新球对应的坐标
            ball_dict['pos'] = x,y
            ball_dict['x_speed'] = x_speed
            ball_dict['y_speed'] = y_speed

        pygame.display.flip()