嚕嚕嚕嚕嚕~
今天是這學期的第九堂物裡課
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話說今天閃耀耀的耀哥給我們看了一個東西
https://dl.dropboxusercontent.com/u/62508554/physics/courseWeb/sound/files/mysound.zip
這個是今天的範例
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EJS有一個非成神奇的特性
還是該說是屬性呢...
他可以使用一些之前已經寫好的打包的Java函式
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要怎麼使用呢?
首先是點開右上方雖然不起眼但其時閃亮亮的按鈕
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接著選擇Run options
就可以看到外掛的函式庫了
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他的檔名叫做mySG.jar
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而在設定初始值裡，似乎也有他的蹤跡呢...
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有玩過Minecraft的人應該都知道.jar檔是可以用解壓縮軟體去看到裡面的檔案構造
雖然說看得到啦，但mySG裡面的class檔案不管是用記事本開還是用eclipse，不是開不起來就是亂碼
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https://dl.dropboxusercontent.com/u/62508554/physics/courseWeb/sound/files/mysound.zip
所以如果要開，還是要用原始檔，不能夠用已經封裝好的
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範本是從耀哥的網站上抓下來的
至於要如何打開這個勇者呢?選擇File裡面的Inport
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然後選擇這個
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剛剛下載的壓縮檔可以不用解壓縮沒關係，在這裡選擇檔案的位置
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然後把他開起來
選擇mySG>>src>>mySG>>SG.java
Package mySG 裡面有一個叫SG的 Class
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因為內容實在是太多了，無法一一截圖
就把整個內容複製過來
猜猜看剛剛在EJS裡"new mySG.SG(frequence,amplitude) "
究竟會使用到這東程式碼的哪一段呢
==============我是佔版面用的================
public class SG
{
public void setBaseFrequency(double d)
{
baseF = d;
if(baseF < 100D)
baseF = 100D;
else
if(baseF > 2000D)
baseF = 2000D;
period = (int)(UNIT / baseF);
record = new byte[period];
Y = new double[period];
omega = 6.2831853071795862D / (double)period;
setit();
}
public void setAmplitude(double d)
{
amplitude = d;
setit();
}
private void setit()
{
if(soundStream != null)
{
stop();
playstatus = true;
}
calc();
if(playstatus)
play();
}
public void setCosCoeff(double ad[])
{
if(ad.length < maxK)
maxi = ad.length;
else
maxi = maxK;
for(int i = 0; i < maxi; i++)
cosCoeff[i] = ad[i];
}
public void setSinCoeff(double ad[])
{
if(ad.length < maxK)
maxi = ad.length;
else
maxi = maxK;
for(int i = 0; i < maxi; i++)
sinCoeff[i] = ad[i];
}
public void setFourier(double ad[], double ad1[])
{
setCosCoeff(ad1);
setSinCoeff(ad);
calFourier();
}
public void setCosCoeff(int i, double d)
{
if(i < maxK)
cosCoeff[i] = d;
}
public void setSinCoeff(int i, double d)
{
if(i < maxK)
sinCoeff[i] = d;
}
public void calFourier()
{
if(soundStream != null)
{
stop();
playstatus = true;
}
for(int i = 0; i < period; i++)
{
y = cosCoeff[0];
for(int j = 1; j < maxi; j++)
y += cosCoeff[j] * Math.cos((double)(i * j) * omega) + sinCoeff[j] * Math.sin((double)(i * j) * omega);
Y[i] = amplitude * y;
}
setWave(Y);
if(playstatus)
play();
}
public void play()
{
try
{
if(soundStream == null)
soundStream = new ContinuousAudioDataStream(new AudioData(record));
AudioPlayer.player.start(soundStream);
playstatus = true;
}
catch(SecurityException securityexception) { }
}
public void pause()
{
if(soundStream != null)
{
try
{
AudioPlayer.player.stop(soundStream);
playstatus = false;
}
catch(SecurityException securityexception) { }
}
}
public void stop()
{
if(soundStream != null)
{
try
{
AudioPlayer.player.stop(soundStream);
soundStream = null;
}
catch(SecurityException securityexception) { }
}
playstatus = false;
}
private void calc()
{
A = amplitude * amplitudeCST;
for(int i = 0; i < period; i++)
{
y = A * Math.sin((double)i * omega);
record[i] = int2ulaw((int)y);
Y[i] = y;
}
}
public void setbaseLevel(double d)
{
amplitudeCST = d;
}
public void setWave(double ad[])
{
setWave(ad, 1.0D);
}
public void setWave(double ad[], double d)
{
if(period != ad.length)
{
period = ad.length;
record = new byte[period];
Y = new double[period];
}
for(int i = 0; i < period; i++)
{
Y[i] = ad[i] * d * amplitudeCST;
record[i] = int2ulaw((int)Y[i]);
}
}
public void changeLevel(double d)
{
for(int i = 0; i < period; i++)
{
Y[i] = Y[i] * d;
record[i] = int2ulaw((int)Y[i]);
}
}
public static byte int2ulaw(int i)
{
char c;
if(i < 0)
{
i = -i;
c = '\177';
} else
{
c = '\377';
}
if(i < 32)
i = 0xf0 | 15 - i / 2;
else
if(i < 96)
i = 0xe0 | 15 - (i - 32) / 4;
else
if(i < 224)
i = 0xd0 | 15 - (i - 96) / 8;
else
if(i < 480)
i = 0xc0 | 15 - (i - 224) / 16;
else
if(i < 992)
i = 0xb0 | 15 - (i - 480) / 32;
else
if(i < 2016)
i = 0xa0 | 15 - (i - 992) / 64;
else
if(i < 4064)
i = 0x90 | 15 - (i - 2016) / 128;
else
if(i < 8160)
i = 0x80 | 15 - (i - 4064) / 256;
else
i = 128;
return (byte)(c & i);
}
public SG()
{
baseF = 440D;
soundStream = null;
playstatus = false;
amplitude = 10D;
amplitudeCST = 1000D;
maxK = 20;
cosCoeff = new double[maxK];
sinCoeff = new double[maxK];
amplitude = 1.0D;
baseF = 440D;
setBaseFrequency(baseF);
}
public SG(double d)
{
baseF = 440D;
soundStream = null;
playstatus = false;
amplitude = 10D;
amplitudeCST = 1000D;
maxK = 20;
cosCoeff = new double[maxK];
sinCoeff = new double[maxK];
amplitude = 1.0D;
setBaseFrequency(d);
}
public SG(double d, double d1)
{
baseF = 440D;
soundStream = null;
playstatus = false;
amplitude = 10D;
amplitudeCST = 1000D;
maxK = 20;
cosCoeff = new double[maxK];
sinCoeff = new double[maxK];
amplitude = d1;
setBaseFrequency(d);
}
private static double UNIT = 8000D;
private int period;
private double baseF;
private double omega;
private byte record[];
private double Y[];
private InputStream soundStream;
private boolean playstatus;
private double amplitude;
private double y;
private double amplitudeCST;
private double A;
private int maxK;
private int maxi;
private double cosCoeff[];
private double sinCoeff[];
}
==============佔版面用的工作以經結束了================
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大家猜對了嗎?
其實剛剛的 new mySG.SG(frequence,amplitude)
是指說 新建一個 mySG裡面的SG函式
其實和下禮拜會教到的C++的一些Class的架構大同小異呢
沒想到耀哥居然有預知的能力，真的是太強大了呀!!!
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