Java-Programming-Exercises/BeatBoxTemp.java at master · RoyTien/Java-Programming-Exercises · GitHub

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import java.awt.*;

import javax.swing.*;

import javax.sound.midi.*;

import java.util.*;

import java.awt.event.*;

public class BeatBoxTemp{

JPanel mainPanel;

ArrayList<JCheckBox> checkboxList;

Sequencer sequencer;

Sequence sequence;

Track track;

JFrame theFrame;

String[] instrumentNames = {"Bass Brum","Closed Hi-Hat",

"Open Hi-Hat","Acoustic Snare","Crash Cymbl","Hand Clap","High Tom",

"Hi Bongo","Maracas","Whistle","Low Conga","Cowbell","Vibraslap",

"Low-mid Tom","High Agogo","Open Hi Conga"};

int[] instruments = {35,42,46,38,49,39,50,60,70,72,64,56,58,47,67,63};

public static void main(String[] args){

new BeatBoxTemp().buildGUI();

}

public void buildGUI(){

theFrame = new JFrame("Cyber BeatBox");

theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

BorderLayout layout = new BorderLayout();

JPanel background = new JPanel(layout);

//设定面板上摆设组件时的空白边缘

background.setBorder(BorderFactory.createEmptyBorder(10,10,10,10));

checkboxList = new ArrayList<JCheckBox>();

//BoxLayout 可以指定在容器中是否对控件进行水平或者垂直放置

//Y_AXIS-组件从上到下纵向排列

//按钮的Layout

Box buttonBox = new Box(BoxLayout.Y_AXIS);

JButton start = new JButton("Start");

start.addActionListener(new MyStartListener());

buttonBox.add(start);

JButton stop = new JButton("Stop");

stop.addActionListener(new MyStopListener());

buttonBox.add(stop);

JButton upTempo = new JButton("Tempo Up");

upTempo.addActionListener(new MyUpTempoListener());

buttonBox.add(upTempo);

JButton downTempo = new JButton("Tempo Down");

downTempo.addActionListener(new MyDownTempoListener());

buttonBox.add(downTempo);

//乐器的名字的Layout

Box nameBox = new Box(BoxLayout.Y_AXIS);

for(int i = 0; i<16; i++){

nameBox.add(new Label(instrumentNames[i]));

}

//添加组件到背景的Panel

background.add(BorderLayout.EAST,buttonBox);

background.add(BorderLayout.WEST,nameBox);

//添加Panel到Frame

theFrame.getContentPane().add(background);

//GridLayout 将整个容器划分成一定的行和一定的列，可以指定控件放在某行某列上

//设置复选框

GridLayout grid = new GridLayout(16,16);

//设置布局的垂直间隙

grid.setVgap(1);

//设置布局的水平间隙

grid.setHgap(2);

mainPanel = new JPanel(grid);

background.add(BorderLayout.CENTER,mainPanel);

//创建checkbox组,设定成未勾选的为false并加到ArrayList和面板上

for(int i = 0;i<256; i++){

JCheckBox c = new JCheckBox();

c.setSelected(false);

checkboxList.add(c);

mainPanel.add(c);

}

setUpMidi();

theFrame.setBounds(50,50,300,300);

theFrame.pack();

theFrame.setVisible(true);

}

//一般的MIDI程序代码

public void setUpMidi(){

try{

sequencer = MidiSystem.getSequencer();

sequencer.open();

//PPQ-基于速度的定时类型，其精度用每四分音符的拍子数（节拍）表示。

sequence = new Sequence(Sequence.PPQ,4);

track = sequence.createTrack();

//setTempoInBPM

//设置速度，以每四分音符的微秒数为单位。

sequencer.setTempoInBPM(120);

}catch(Exception e){e.printStackTrace();}

}

//将复选框状态转换为MIDI事件并加到track上

public void buildTrackAndStart(){

//创建出16个元素的来存储一项乐器的值,

//如果该节应该要演奏,其值会是关键字值,否则值为零

int[] trackList = null;

//清除掉旧的track做一个新的

sequence.deleteTrack(track);

track = sequence.createTrack();

//对每个乐器都执行一次

for(int i = 0; i<16;i++){

trackList = new int[16];

//instruments-乐器的代码

int key = instruments[i];

for(int j = 0; j<16;j++){

JCheckBox jc = (JCheckBox) checkboxList.get(j+(16*i));

//如果有勾选,将关键字值放到数组的该位置上,不然就补零

if(jc.isSelected()){

trackList[j] = key;

}else{

trackList[j] = 0;

}

}//关闭内部循环

//创建此乐器的事件并加到track上

makeTracks(trackList);

track.add(makeEvent(176,1,127,0,16));

}//关闭外部循环

//确保第16拍有事件,否则BeatBox不会重复播放

track.add(makeEvent(192,9,1,0,15));

try{

sequencer.setSequence(sequence);

//指定无穷的重复次数

sequencer.setLoopCount(sequencer.LOOP_CONTINUOUSLY);

//开始播放

sequencer.start();

sequencer.setTempoInBPM(120);

}catch(Exception e){e.printStackTrace();}

}//关闭buildTrackAndStart方法

//按钮的监听者

public class MyStartListener implements ActionListener{

public void actionPerformed(ActionEvent a){

buildTrackAndStart();

}

}//关闭内部类

public class MyStopListener implements ActionListener{

public void actionPerformed(ActionEvent a){

sequencer.stop();

}

}//关闭内部类

//节奏因子,每次调整3%

public class MyUpTempoListener implements ActionListener{

public void actionPerformed(ActionEvent a){

float tempoFactor = sequencer.getTempoFactor();

sequencer.setTempoFactor((float)(tempoFactor * 1.03));

}

}//关闭内部类

public class MyDownTempoListener implements ActionListener{

public void actionPerformed(ActionEvent a){

float tempoFactor = sequencer.getTempoFactor();

sequencer.setTempoFactor((float)(tempoFactor * 0.97));

}

}//关闭内部类

//创建某项乐器的所有事件

public void makeTracks(int[] list){

for(int i = 0; i <16; i++){

int key = list[i];

// 创建NOTE On和NOTE OFF事件并加入到track上

if(key != 0){

track.add(makeEvent(144,9,key,100,i));

track.add(makeEvent(128,9,key,100,i+1));

}

public MidiEvent makeEvent(int comd, int chan, int one, int two, int tick){

MidiEvent event = null;

try{

ShortMessage a = new ShortMessage();

a.setMessage(comd,chan,one,two);

event = new MidiEvent(a,tick);

}catch(Exception e){e.printStackTrace();}

return event;

}

}//关闭类

Java-Programming-Exercises/BeatBoxTemp.java at master · RoyTien/Java-Programming-Exercises · GitHub

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