电子鼓程序，"Java Examples in Nutshell”中的例子，按键盘发声

电子鼓程序，"Java Examples in Nutshell”中的例子，按键盘发声 [无满意答案结贴,结贴人:qingbt]

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发表于：2008-07-13 08:25:47 楼主

import javax.sound.midi.*;
import java.awt.event.*;
import javax.swing.*;

public class Drums extends JFrame {
MidiChannel channel; // The channel we play on: 10 is for percussion
int velocity = 64; // Default volume is 50%

public static void main(String[ ] args) throws MidiUnavailableException
{
// We don't need a Sequencer in this example, since we send MIDI
// events directly to the Synthesizer instead.
Synthesizer synthesizer = MidiSystem.getSynthesizer( );
synthesizer.open( );
JFrame frame = new Drums(synthesizer);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(50, 128); // We use window width as volume control
frame.setVisible(true);
}

public Drums(Synthesizer synth) {
super("Drums");

// Channel 10 is the GeneralMidi percussion channel. In Java code, we
// number channels from 0 and use channel 9 instead.
channel = synth.getChannels( )[9];

addKeyListener(new KeyAdapter( ) {
public void keyPressed(KeyEvent e) {
int key = e.getKeyCode( );
if (key >= 35 && key <= 81) {
channel.noteOn(key, velocity);
}
}
public void keyReleased(KeyEvent e) {
int key = e.getKeyCode( );
if (key >= 35 && key <= 81) channel.noteOff(key);
}
});

addMouseMotionListener(new MouseMotionAdapter( ) {
public void mouseMoved(MouseEvent e) {
velocity = e.getX( );
}
});
}
}

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