pygame 飞机大战动态画面的实现方式（三）精灵类，实现两种图片的加载方式

目标：实现单张、多种图片的加载，实现动态画面

把方式（一）和方式（二)两种方式结合，简化了一些代码。在一个类里，实现了两种方式的加载

load_image 单张

load_images 加载多张

代码如下：

import pygame
from pygame.locals import *


class Blast(pygame.sprite.Sprite):
    def __init__(self, scene):
        pygame.sprite.Sprite.__init__(self)
        self.main_scene = scene
        self.image = None
        self.rect = None
        self.frame = 0
        self.first_frame = 0
        self.last_frame = 0
        self.columns = 1
        self.images = []
        self.last_time = pygame.time.get_ticks()
        self.rate = 100

    def load_images(self, filename_prefix, begin_num, end_num,
                    filename_suffix):

        self.images = [
            pygame.image.load(filename_prefix + str(v) + filename_suffix)
            for v in range(begin_num, end_num + 1)
        ]
        self.image = self.images[0]
        self.rect = self.image.get_rect()
        self.last_frame = end_num -1

    def load_image(self, filename, width, height, rows, columns):
        frame_width = width // columns
        frame_height = height // rows
        self.boom_picture = pygame.image.load(filename)
        for row in range(rows):
            for col in range(columns):
                frame = self.boom_picture.subsurface([
                    col * frame_width, row * frame_height, frame_width,
                    frame_height
                ])
                self.images.append(frame)
        self.image = self.images[0]
        self.last_frame = rows * columns - 1
        self.rect = self.images[0].get_rect()


    def set_pos(self, x, y):
        self.rect.x = x
        self.rect.y = y

    def update(self):
        current_time = pygame.time.get_ticks()
        if current_time > self.last_time + self.rate:
            self.frame += 1
            if self.frame > self.last_frame:
                self.frame = self.first_frame
            self.last_time = current_time
            self.image = self.images[self.frame]


pygame.init()
screen = pygame.display.set_mode((800, 600), 0, 32)
pygame.display.set_caption("精灵类测试")
font = pygame.font.Font(None, 18)
framerate = pygame.time.Clock()

blast1 = Blast(screen)
blast1.load_image('blast9.png', 658, 329, 4,8)
blast2 = Blast(screen)
blast2.load_images('blast', 1, 11, '.gif')
group = pygame.sprite.Group()
blast1.set_pos(200, 220)
blast2.set_pos(400,200)
group.add(blast1)
group.add(blast2)

while True:

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            exit()
    key = pygame.key.get_pressed()
    if key[pygame.K_ESCAPE]:
        exit()

    screen.fill((0, 0, 0))

    group.update()
    group.draw(screen)
    pygame.display.update()

其中 blast9.png 是一张图，长658，宽329，切割 4行，8列。

blast1~~~blast11  是一组动态图。