11 Pygame进阶

Pygame事件

import pygame

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

    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，获取鼠标产生的坐标位置
            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，获取键盘的按下的键的编码值
            if event.type == pygame.KEYDOWN:
                print('键盘按键按下', event.key)
            # chr(编码值)转换成按键符号
            if event.type == pygame.KEYUP:
                print('键盘按钮弹起', chr (event.key))

鼠标事件应用

import pygame

产生随机颜色

from random import randint
def rand_color():
    return randint(0, 255), randint(0, 255), randint(0, 255)

随机产生半径10-20的球在鼠标点击的位置

def draw_ball():
    if event.type == pygame.MOUSEMOTION:
        pygame.draw.circle(screen, rand_color(), event.pos, randint(10, 20))

只要屏幕上的内容有更新，都需要调用下面这两种方法中的一个

        pygame.display.filp()
        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_InRect(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(screen, bth_color, title_color):
    # 画个按钮
    """
    矩形框
    """
    pygame.draw.rect(screen, bth_color, (100, 100, 100, 60))
    """
    文字
    """
    font = pygame.font.SysFont('Times', 30)
    title = font.render('clicke ', True, title_color)
    screen.blit(title,(120, 120))

if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((600, 400))
    screen.fill((255, 255, 255))
    pygame.display.set_caption('鼠标事件')

画个按钮

    draw_button(screen,(0,255,0),(255,0,0))

矩形框

    pygame.draw.rect(screen, (0, 255, 0), (100, 100, 100, 60))

文字

    font = pygame.font.SysFont('Times', 30)
    title = font.render('clicke ',True,(255, 0, 0))
    screen.blit(title,(120, 120))

    pygame.display.flip()

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

在指定的坐标处画一个球

            if event.type == pygame.MOUSEBUTTONDOWN:
                # draw_ball(screen, evnet.pos)
                if is_InRect(event.pos, (100, 100, 100, 60)):
                    print('点中按钮')
                    draw_button(screen, (0, 100, 0), (100, 0, 0))
                    pygame.display.update()

            if event.type == pygame.MOUSEBUTTONUP:
                if is_InRect(event.pos, (100, 100, 100, 60)):
                    draw_button(screen, (0, 255, 0), (255, 0, 0))
                    pygame.display.update()

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

鼠标点击应用事件2

要求：先在屏幕上显示一张图片，鼠标按下移动的时候，拽着图片一起动，鼠标弹起就不动了。

import pygame

写一个函数，判断指定的点是否在指定的某个范围中

def is_InRect(point, rect):
    x, y = point
    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((600, 400))
    screen.fill((255, 255, 255))
    pygame.display.set_caption('图片拖拽')

显示一张图片

    image = pygame.image.load('./lew.jpg')
    image = pygame.transform.rotozoom(image, 0, 0.2)
    image_x = 0
    image_y = 0

    screen.blit(image, (image_x, image_y))

展示在屏幕上

    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_InRect(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

鼠标移动对应的事件

            if event.type == pygame.MOUSEMOTION:
                if is_move:
                    # 覆盖上一次的背景图，只显示一张图
                    screen.fill((255, 255, 255))
                    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, (image_x, image_y))
                    pygame.display.update()

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

页面上的静态内容

静态文字

def static_page(screen):

    font = pygame.font.SysFont('Times', 40)
    title = font.render('Welcome', True,(0, 0, 0))
    screen.blit(title, (200, 200))

def animation_title(screen):

字体颜色发生改变

    font = pygame.font.SysFont('Times', 40)
    title = font.render('Python', True, (randint(0, 255), randint(0, 255), randint(0, 255)))
    screen.blit(title, (100, 100))

if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((600, 400))
    screen.fill((255, 255, 255))

    static_page(screen)

    pygame.display.flip()

    while True:
        # for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()

在下面去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（线程在这阻塞指定的时间）
单位：毫秒 (1000 ms = 1s)

        pygame.time.delay(1000)

动画前要将原来的内容全部清空

        screen.fill((255, 255, 255))


        static_page(screen)
        animation_title(screen)

内容展示完成后，要更新到屏幕上

        pygame.display.update()

BallGame

import pygame

画球

def draw_ball(place,color,pos):

    pygame.draw.circle(place, color, pos, 20)

Up = 273
Down = 274
Left = 276
Right = 275

if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((600, 400))
    screen.fill((255, 255, 255))

    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()

通过上下左右键控制球的方向

            if event.type == pygame.KEYDOWN:
                if event.key == Up:
                    y_speed = -1
                    x_speed = 0
                elif event.key ==Down:
                    y_speed = 1
                    x_speed = 0
                elif event.key == Right:
                    x_speed = 1
                    y_speed = 0
                elif event.key == Left:
                    x_speed = -1
                    y_speed = 0

刷新屏幕

        screen.fill((255, 255, 255))

        pygame.time.delay(5)
        ball_x += x_speed
        ball_y += y_speed
        if ball_x + 20 >= 600:
            ball_x = 600-20
            x_speed *= -1
        draw_ball(screen, (255, 0, 0), (ball_x, ball_y))
        if ball_x - 20 <= 0:
            ball_x = 20
            x_speed *= -1
        draw_ball(screen, (255, 0, 0), (ball_x, ball_y))

        pygame.display.update()

多个球一起运动

import pygame
import random
random_color = random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)

if __name__ == '__main__':
    pygame.init()
    screen = pygame.display.set_mode((600, 400))
    screen.fill((255, 255, 255))
    pygame.display.flip()

all_ball中保存多个球

每个球要保存：半径、圆心坐标、颜色、x速度、y速度

    all_balls = [
        {'r': random.randint(10, 20), 'pos': (100, 100),'color': random_color,
         'x_speed':random.randint(-3, 3), 'y_speed':random.randint(-3, 3)},
        {'r': random.randint(10, 20), 'pos': (100, 100),'color': random_color,
         'x_speed':random.randint(-3, 3), 'y_speed':random.randint(-3, 3)},
    ]

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

点击鼠标创建一个球

            if event.type == pygame.MOUSEBUTTONDOWN:
                ball = {'r':random.randint(10, 25),
                        'pos': event.pos,
                        'color':random_color,
                        'x_speed':random.randint(-3,3),
                        'y_speed':random.randint(-3,3)
                        }

保存球

                all_balls.append(ball)

刷新界面

        screen.fill((255, 255, 255))

        pygame.time.delay(100)

取出球原来的x坐标和y坐标以及他们的速度

        for ball_dict in all_balls:
            x, y = ball_dict['pos']
            x_speed = ball_dict['x_speed']
            y_speed = ball_dict['y_speed']
            x += x_speed
            y += y_speed
            pygame.draw.circle(screen, ball_dict['color'], (x, y), ball_dict['r'])

更新球对应的坐标

            ball_dict['pos'] = x, y

        pygame.display.update()