上一篇已經(jīng)創(chuàng)建了基類讨阻，接下來繼承基類創(chuàng)建動(dòng)態(tài)背景偎蘸、飛機(jī)的基礎(chǔ)類料按。

創(chuàng)建背景基類

class BackGround(Base):
    def __init__(self, pygame_screen, image_name,type):
        Base.__init__(self,pygame_screen, (0, 0), image_name)
        self.movedistance = 852 // 200            #動(dòng)態(tài)背景每次移動(dòng)的距離
        self.type         = type                  #背景類型："dynamic" 動(dòng)態(tài)奄侠，為空或任意字符都為靜態(tài)
    def display(self):
        if self.type == "dynamic":                #動(dòng)態(tài)背景
            self.y += self.movedistance
            self.y2 = self.y - self.h
            if self.y >= 852:
                self.y = 0
            self.screen.blit(self.image, (self.x, self.y2))
        self.screen.blit(self.image, (self.x, self.y))

type 屬性：用來區(qū)分創(chuàng)建的背景是動(dòng)態(tài)的還是靜態(tài)，因?yàn)橛螒驎和１尘笆庆o態(tài)的载矿。

動(dòng)態(tài)背景是飛機(jī)俯瞰地面的圖像垄潮，我們會(huì)讓它不停的向下移動(dòng)，這樣看上去就像飛機(jī)往上飛闷盔。

動(dòng)態(tài)背景就是兩張相同的背景圖循環(huán)向下移動(dòng)弯洗。畫框部分是顯示的圖像。

加上創(chuàng)建對象及相關(guān)測試腳本

def main():
    screen = pygame.display.set_mode((480, 852), 0, 32)
    # 添加背景
    Bg = BackGround(screen, Image_Background, 'dynamic')
    while True:
        Bg.display()
        pygame.display.update()
        for event in pygame.event.get():
            pass
if __name__ == '__main__' :
    main()

運(yùn)行效果

創(chuàng)建背景使用了一個(gè)變量Image_Background逢勾，來指定圖片文件

Bg = BackGround(screen, Image_Background, 'dynamic')

Image_Background 是已經(jīng)聲明好的變量,在程序的開頭部分牡整，集中聲明了大量這種類似的變量。
實(shí)際開發(fā)中溺拱，也建議大家這樣做逃贝，易于閱讀，也易于維護(hù)迫摔。

#靜態(tài)資源集中聲明
Font_Icmblk             = "./res/Interstate Cond Mono - Blk.ttf"
Font_Consola            = "consola.ttf"
#暫停背景圖片沐扳，系統(tǒng)保存暫停前的最后一個(gè)畫面作為背景
Image_Pausedbg          = "pausedbg.png"
#背景
Image_Background        = "./res/background.png"
#顯示當(dāng)前剩余Live
Image_ShowHealth        = "./res/health2.png"
Image_Logo              = "./res/name.png"
Image_Sound             = "./res/sound.png"
Image_SoundNor          = "./res/sound_nor.png"
Image_Music             = "./res/music.png"
Image_MusicNor          = "./res/music_nor.png"
#飛機(jī)的血量(一格)
Image_HeroHealth        = "./res/health.png"
#玩家飛機(jī)正常狀態(tài)
Image_HeroPlane         = "./res/hero2.png"
#玩家飛機(jī)向前飛行
Image_HeroPlaneUp       = "./res/hero1.png"
#玩家飛機(jī)子彈
Image_HeroBullet        = "./res/bullet2.png"
#補(bǔ)給包1
Image_Reward1           = "./res/prop_type_0.png"
#補(bǔ)給包2
Image_Reward2           = "./res/prop_type_1.png"
#敵機(jī)子彈
Image_EnemyBullet       = "./res/bullet1.png"
#敵機(jī)1
Image_EnemyPlane_1      = "./res/enemy0.png"
#Boss1
Image_BossPlane1        = "./res/enemy2.png"
#Boss1 一半血量
Image_BossPlane1Half    = "./res/enemy2_down1.png"
#帶獎(jiǎng)勵(lì)的敵機(jī)
Image_RewardPlane1      = "./res/enemy1.png"

#飛機(jī)爆炸
Sound_Boom              = "./music/enemy1_down.wav"
#開火
Sound_HeroFire          = "./music/bullet.wav"
#敵機(jī)1刷新
Sound_EnemyPlane_1      = "./music/enemy2_out.wav"
#飛機(jī)中彈
Sound_Hit               = "./music/enemy3_down.wav"
#游戲暫停
Sound_Pause             = "./music/game_achievement.wav"
#按鈕點(diǎn)擊
Sound_ButtonOnClicked   = "./music/enemy4_down.wav"
#背景音樂
Music_backgroud         = "./music/game_music.mp3"
#繼續(xù)按鈕
Image_ButtonResume      = "./res/resume_nor.png"
Image_ButtonRestart     = "./res/restart_nor.png"
Image_ButtonQuit        = "./res/quit_nor.png"
Image_ButtonStart       = "./res/game_resume_pressed.png"
Image_ButtonStart2      = "./res/game_resume_nor.png"
#全局變量
#是否播放音效
Sound_IsPlay            = True

創(chuàng)建飛機(jī)的基類：

class BasePlane(Base):
    def __init__(self, pygame_screen, postion, image_name, bulletCoolDownSpeed,bullets):
        Base.__init__(self, pygame_screen, postion, image_name) 
        self.bullet_list = bullets
        self.bulletCoolDownSpeed = bulletCoolDownSpeed  #子彈冷卻時(shí)間
        self.bulletCoolDownstate = 0                    #子彈冷卻計(jì)時(shí)
        self.bulletCdOk          = True                 #子彈冷卻好
        self.live                = 1                    #飛機(jī)有幾條命
        self.Health              = 4                    #當(dāng)前血量
        self.MaxHealth           = 4                    #一條命有幾格血
        self.Reward              = ''                   #爆炸后是否有獎(jiǎng)勵(lì)
        self.HealthImage         = pygame.image.load(Image_HeroHealth)#單格血條圖片
        # 爆炸效果
        self.hit                 = False  # 被擊中
        self.bomb_list           = []     # 爆炸分幀圖片組
        self.image_num           = 0      # 顯示刷新多少次換一張圖片
        self.image_index         = 0      # 當(dāng)前顯示圖片的index
  
    def bulletCoolDown(self):
        #子彈冷卻判斷
        if self.bulletCoolDownstate > 0:
            self.bulletCoolDownstate += 1
            if self.bulletCoolDownstate == self.bulletCoolDownSpeed:
                self.bulletCoolDownstate = 0
                self.bulletCdOk = True
    def boom(self):
        self.screen.blit(self.bomb_list[self.image_index], (self.x, self.y))
        self.image_num += 1
        if self.image_num == 8:  # 刷新10次切換1張圖
            self.image_num = 0
            self.image_index += 1
        if self.image_index > 3:
            self.hit         = False  # 爆炸動(dòng)畫播放完成，再修改標(biāo)記
            self.image_num   = 1
            self.image_index = 1

    def display(self):
        if self.hit == True:
            if self.live == 0 :   #被擊中且live=0句占，飛機(jī)爆炸
                self.boom()
                playsound(Sound_Boom)
            else:
                self.Health -= 1         #live   > 0 ,扣一格血
                if self.Health == 0:     #Health = 0 ,扣一條命
                    self.live -= 1
                    if self.live > 0:    #只有玩家飛機(jī)有多條生命沪摄，這部分針對玩家飛機(jī)飛機(jī)，扣一條民之后又10秒無敵時(shí)間
                        self.Invincible = True
                        self.Health     = self.MaxHealth
                        self.hit        = False
                else:
                    self.hit = False
        else:
            self.screen.blit(self.image, (self.x, self.y))

bulletCoolDown 方法：控制子彈冷卻時(shí)間纱烘，
boom 方法：顯示飛機(jī)爆炸動(dòng)畫
display 方法：繪制顯示的圖像

本篇講解了背景基類的創(chuàng)建及動(dòng)態(tài)背景原理杨拐，另外創(chuàng)建了飛機(jī)的基類。下一篇繼續(xù)講解玩家飛機(jī)類的創(chuàng)建及其控制方法凹炸。