Drumspublic class Drums extends 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. |
| Fields Summary |
|---|
| MidiChannel | channel | | int | velocity |
| Constructors Summary |
|---|
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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| Methods Summary |
|---|
| public static void | main(java.lang.String[] args) // Default volume is 50%
// 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);
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