小游戏《Let's Go! PiPiXia!》

在知乎上发现此游戏的分享，非常感谢作者的分享。这是我阅读的第一个小项目代码。给我最深的体会便是divide and conquer，逐步实现模块的功能，最后实现游戏的功能。简单分析，好像游戏实现的思路并不难。

module 1. PPX的实现

# -*- coding: utf-8 -*-
import math
import random
import cocos

class PPX(cocos.sprite.Sprite):
    def __init__(self):
        super(PPX, self).__init__('ppx.png')
        self.can_jump = False
        self.speed = 0
        self.image_anchor = 0, 0
        self.position = 100, 300
        self.schedule(self.update)

    def jump(self, h):
        if self.can_jump:
            self.y += 1
            self.speed -= max(min(h, 10), 7)
            self.can_jump = False

    def land(self, y):
        if self.y > y - 30:
            self.can_jump = True
            self.speed = 0
            self.y = y

    def update(self, dt): #重力属性
        self.speed += 10 * dt
        self.y -= self.speed
        if self.y < -80:
            self.reset()

    def reset(self):
        self.parent.reset()
        self.can_jump = False
        self.speed = 0
        self.position = 100, 300

module 2. Block的实现

# -*- coding: utf-8 -*-
import math
import random
import cocos

class Block(cocos.sprite.Sprite):
    def __init__(self, pos):
        super(Block, self).__init__('black.png')
        self.image_anchor = 0, 0
        x, y = pos
        if x == 0:
            self.scale_x = 5
            self.scale_y = 1
        else:
      # 随机产生黑块的大小
      # random.random() 产生0 ~ 1 的小数
            self.scale_x = 0.5 + random.random() * 1.5
            self.scale_y = min(max(y - 50 + random.random() * 100, 50), 300) / 100.0
            self.position = x + 50 + random.random() * 100, 0

module 3. 主体的实现

# -*- coding: utf-8 -*-
import cocos
from cocos.sprite import Sprite
from pyaudio import PyAudio, paInt16
import struct
from ppx import PPX
from block import Block

class VoiceGame(cocos.layer.ColorLayer):
    is_event_handler = True

    def __init__(self):
        super(VoiceGame, self).__init__(255, 255, 255, 255, 800, 600)

        

        # init voice
        self.NUM_SAMPLES = 1000  # pyAudio内部缓存的块的大小
        self.LEVEL = 1500  # 声音保存的阈值
    #声音强度条
        self.voicebar = Sprite('black.png', color=(0, 0, 255))
        self.voicebar.position = 20, 450
        self.voicebar.scale_y = 0.1
        self.voicebar.image_anchor = 0, 0
        self.add(self.voicebar)

        self.ppx = PPX()
        self.add(self.ppx)

        self.floor = cocos.cocosnode.CocosNode()
        self.add(self.floor)
        pos = 0, 100
    #循环产生100个黑块
        for i in range(100):
            b = Block(pos)
            self.floor.add(b)
            pos = b.x + b.width, b.height

        # 开启声音输入
        pa = PyAudio()
        SAMPLING_RATE = int(pa.get_device_info_by_index(0)['defaultSampleRate'])
        self.stream = pa.open(format=paInt16, channels=1, rate=SAMPLING_RATE, input=True, frames_per_buffer=self.NUM_SAMPLES)

        self.schedule(self.update)

    def on_mouse_press(self, x, y, buttons, modifiers):
        pass

    def collide(self):
        px = self.ppx.x - self.floor.x
        for b in self.floor.get_children():
            if b.x <= px + self.ppx.width * 0.8 and px + self.ppx.width * 0.2 <= b.x + b.width:  #落在黑块
                if self.ppx.y < b.height:
                    self.ppx.land(b.height)
                    break

    def update(self, dt):
        # 读入NUM_SAMPLES个取样
        string_audio_data = self.stream.read(self.NUM_SAMPLES)
        k = max(struct.unpack('1000h', string_audio_data))
        # print k
        self.voicebar.scale_x = k / 10000.0
        if k > 3000:
            self.floor.x -= min((k / 20.0), 150) * dt
        if k > 8000:
            self.ppx.jump((k - 8000) / 1000.0)
        self.collide()

    def reset(self):
        self.floor.x = 0


cocos.director.director.init(caption="Let's Go! PiPiXia!")
cocos.director.director.run(cocos.scene.Scene(VoiceGame()))

附上源码地址：http://git.oschina.net/crossin/learn-python/tree/master/voicegame

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