[chapter13] BeatBox (p.454)

[유대성]

import java.awt.BorderLayout;

import java.awt.GridLayout;

import java.awt.Label;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.ArrayList;

import javax.sound.midi.MidiEvent;

import javax.sound.midi.MidiSystem;

import javax.sound.midi.Sequence;

import javax.sound.midi.Sequencer;

import javax.sound.midi.ShortMessage;

import javax.sound.midi.Track;

import javax.swing.BorderFactory;

import javax.swing.Box;

import javax.swing.BoxLayout;

import javax.swing.JButton;

import javax.swing.JCheckBox;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class BeatBox {

JPanel mainPanel;

ArrayList<JCheckBox> checkboxList;  

Sequencer sequencer;

Sequence sequence;

Track track;

JFrame theFrame;

String[] instrumentNames = {"Bass Drum", "Closed Hi-Hat", "Open Hi-Hat", "Acoustic Snare", "Crash Cymbal", "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 BeatBox().buildGUI();  

}

public void buildGUI() {  

theFrame = new JFrame ("Cyber BeatBox");  

theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  

BorderLayout layout = new BorderLayout();  

JPanel background = new JPanel(layout);  

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

checkboxList = new ArrayList<JCheckBox>(); 

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);

Box nameBox = new Box(BoxLayout.Y_AXIS);

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

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

}

background.add(BorderLayout.EAST, buttonBox);

background.add(BorderLayout.WEST, nameBox);

theFrame.getContentPane().add(background);

GridLayout grid = new GridLayout(16, 16);

grid.setVgap(1);

grid.setHgap(2);

mainPanel = new JPanel(grid);

background.add(BorderLayout.CENTER, mainPanel);

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);

}

public void setUpMidi() {

try{

sequencer = MidiSystem.getSequencer();

sequencer.open();

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

track = sequence.createTrack();

sequencer.setTempoInBPM(120);

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

}

public void buildTrackAndStart() {

int[] trackList = null;

sequence.deleteTrack(track);

track = sequence.createTrack();

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

trackList = new int[16];

int key = instruments[i];

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

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

if(jc.isSelected()) {

trackList[j] = key;

}else {

trackList[j] = 0;

}

}

makeTracks(trackList);

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

}

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

try {

sequencer.setSequence(sequence);

sequencer.setLoopCount(sequencer.LOOP_CONTINUOUSLY);

sequencer.start();

sequencer.setTempoInBPM(120);

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

}

public class MyStartListener implements ActionListener {

public void actionPerformed(ActionEvent a) {

buildTrackAndStart();

}

}

public class MyStopListener implements ActionListener {

public void actionPerformed(ActionEvent a) {

sequencer.stop();

}

}

public class MyUpTempoListener implements ActionListener {

public void actionPerformed(ActionEvent a) {

float tempoFactor = sequencer.getTempoFactor();

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

}

}

public class MyDownTempoListener implements ActionListener {

public void actionPerformed(ActionEvent a) {

float tempoFactor = sequencer.getTempoFactor();

sequencer.setTempoFactor((float)(tempoFactor* .97));

}

}

public void makeTracks(int[] list){

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

int key = list[i];

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;

}

}