一个有趣的BeatBox发声器示例代码,摘自《Head_First_Java》

作者: admin 分类: JAVA 发布时间: 2019-06-26 22:53  阅读: 180 views

一个有趣的利用 javax.swing组件 和 javax.sound组件制作的发声器。早年抄书玩的,可以直接右键运行,可以试试。

package com.chl.play;

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.InvalidMidiDataException;
import javax.sound.midi.MidiEvent;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiUnavailableException;
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;

/**
 * 根据java书籍,编写的一个发声器,挺好玩的
 * @author chenhailong
 *
 */
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","Lo-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("开始");
		start.addActionListener(new MyStartListener());
		buttonBox.add(start);
		
		JButton stop = new JButton("结束");
		stop.addActionListener(new MyStopListener());
		buttonBox.add(stop);
		
		JButton upTempo = new JButton("加速");
		upTempo.addActionListener(new MyUpTempoListener());
		buttonBox.add(upTempo);
		
		JButton downTempo = new JButton("减速");
		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);
		
	}
	
	@SuppressWarnings("static-access")
	public void setUpMidi(){
		try {
			sequencer = MidiSystem.getSequencer();
			sequencer.open();
			sequence = new Sequence(sequence.PPQ, 4);
			track = sequence.createTrack();
			sequencer.setTempoInBPM(120);
		} catch (InvalidMidiDataException e) {
			e.printStackTrace();
		}catch (MidiUnavailableException e) {
			e.printStackTrace();
		}
	}
	
	
	@SuppressWarnings("static-access")
	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 = (JCheckBox)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 static MidiEvent makeEvent(int comd,int chan,int one,int two,int tick ){
		MidiEvent event = null;
		try{
			ShortMessage sm = new ShortMessage();
			sm.setMessage(comd,chan,one,two);
			event = new MidiEvent(sm, tick);
		}catch(Exception e){
			e.printStackTrace();
		}
		return event;
	}
}

 


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