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/*
* Copyright (c) 2004 David Flanagan. All rights reserved.
* This code is from the book Java Examples in a Nutshell, 3nd Edition.
* It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
* You may study, use, and modify it for any non-commercial purpose,
* including teaching and use in open-source projects.
* You may distribute it non-commercially as long as you retain this notice.
* For a commercial use license, or to purchase the book,
* please visit http://www.davidflanagan.com/javaexamples3.
*/
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import javax.sound.midi.MidiChannel;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiUnavailableException;
import javax.sound.midi.Synthesizer;
import javax.swing.JFrame;
/**
* This program the MIDI percussion channel with a Swing window. It monitors
* keystrokes and mouse motion in the window and uses them to create music.
* Keycodes between 35 and 81, inclusive, generate different percussive sounds.
* See the VK_ constants in java.awt.event.KeyEvent, or just experiment. Mouse
* position controls volume: move the mouse to the right of the window to
* increase the volume.
*/
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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