/*
 * 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.
 */
package je3.sound;
import javax.sound.midi.*;
import java.awt.event.*;
import javax.swing.*;

/**
 * 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();
		}
	    });
    }
}