package com.shine.analogoscilloscope;

import java.util.ArrayList;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.media.AudioRecord;
import android.view.SurfaceView;
public class ClsOscilloscope {
        private ArrayList<short[]> inBuf = new ArrayList<short[]>();
        private boolean isRecording = false;// 线程控制标记
        private RecordThread rec;
        private DrawThread draw;
        /**
         * X轴缩小的比例
         */
        public int rateX = 4;
        /**
         * Y轴缩小的比例
         */
        public int rateY = 4;
        /**
         * Y轴基线
         */
        public int baseLine = 0;
        /**
         * 初始化
         */
        public void initOscilloscope(int rateX, int rateY, int baseLine) {
                this.rateX = rateX;
                this.rateY = rateY;
                this.baseLine = baseLine;
        }
        /**
         * 开始
         * 
         * @param recBufSize
         *            AudioRecord的MinBufferSize
         */
        public void Start(AudioRecord audioRecord, int recBufSize, SurfaceView sfv,
                        Paint mPaint) {
                isRecording = true;
                rec = new RecordThread(audioRecord, recBufSize);
                rec.start();// 开始录制线程
                draw = new DrawThread(sfv, mPaint);
                draw.start();// 开始绘制线程
        }
        /**
         * 停止
         */
        public void Stop() {
        	    if(isRecording==true)
                {
        	    	isRecording = false;
        	    	inBuf.clear();// 清除
        	    	rec.stop();
        	    	draw.stop();
                }
        }
        /**
         * 负责从MIC保存数据到inBuf
         * 
         * @author GV
         * 
         */
        class RecordThread extends Thread {
                private int recBufSize;
                private AudioRecord audioRecord;
                public RecordThread(AudioRecord audioRecord, int recBufSize) {
                        this.audioRecord = audioRecord;
                        this.recBufSize = recBufSize;
                }
                public void run() {
                        try {
                                short[] buffer = new short[recBufSize];
                                audioRecord.startRecording();// 开始录制
                                while (isRecording) {
                                        // 从MIC保存数据到缓冲区
                                        int bufferReadResult = audioRecord.read(buffer, 0,
                                                        recBufSize);
                                        short[] tmpBuf = new short[bufferReadResult / (rateX)];
                                        for (int i = 0, ii = 0; i < tmpBuf.length; i++, ii = i
                                                        * rateX) {
                                                tmpBuf[i] = buffer[ii];
                                        }
                                        synchronized (inBuf) {//
                                                inBuf.add(tmpBuf);// 添加数据
                                        }
                                }
                                audioRecord.stop();
                        } catch (Throwable t) {
                        }
                }
        };
        /**
         * 负责绘制inBuf中的数据
         * 
         * @author GV
         * 
         */
        class DrawThread extends Thread {
                private int oldX = 0;// 上次绘制的X坐标
                private int oldY = 0;// 上次绘制的Y坐标
                private SurfaceView sfv;// 画板
                private int X_index = 0;// 当前画图所在屏幕X轴的坐标
                private Paint mPaint;// 画笔
                public DrawThread(SurfaceView sfv, Paint mPaint) {
                        this.sfv = sfv;
                        this.mPaint = mPaint;
                }
                @SuppressWarnings("unchecked")
				public void run() {
                	try{
                        while (isRecording) {
                                ArrayList<short[]> buf = new ArrayList<short[]>();
                                synchronized (inBuf) {
                                        if (inBuf.size() == 0)
                                                continue;
                                        buf = (ArrayList<short[]>) inBuf.clone();// 保存
                                        inBuf.clear();// 清除
                                }
                                for (int i = 0; i < buf.size(); i++) {
                                        short[] tmpBuf = buf.get(i);
                                        SimpleDraw(X_index, tmpBuf, rateY, baseLine);// 把缓冲区数据画出来
                                        X_index = X_index + tmpBuf.length;
                                        if (X_index > sfv.getWidth()) {
                                                X_index = 0;
                                        }
                                }
                        }
                	}catch(Exception e){}
                }
                /**
                 * 绘制指定区域
                 * 
                 * @param start
                 *            X轴开始的位置(全屏)
                 * @param buffer
                 *            缓冲区
                 * @param rate
                 *            Y轴数据缩小的比例
                 * @param baseLine
                 *            Y轴基线
                 */
                void SimpleDraw(int start, short[] buffer, int rate, int baseLine) {
                        if (start == 0)
                                oldX = 0;
                        Canvas canvas = sfv.getHolder().lockCanvas(
                                        new Rect(start, 0, start + buffer.length, sfv.getHeight()));// 关键:获取画布
                        canvas.drawColor(Color.BLACK);// 清除背景
                        int y;
                        for (int i = 0; i < buffer.length; i++) {// 有多少画多少
                                int x = i + start;
                                y = buffer[i]/ rate + baseLine;// 调节缩小比例，调节基准线
                                canvas.drawLine(oldX, oldY, x, y, mPaint);
                                oldX = x;
                                oldY = y;
                        }
                        sfv.getHolder().unlockCanvasAndPost(canvas);// 解锁画布，提交画好的图像
                }
        }
}