1 import javax.sound.midi.*;
2 import java.awt.event.*;
5 * A keyboard listener emulating a synthesizer.
7 * @author Einar Pehrson
10 public class MooKeyboard extends KeyAdapter {
12 private boolean[] isOn;
13 private static int startNote;
14 private static int[] keyToNote;
17 * Sets up the synthesizer emulation.
19 public MooKeyboard() {
20 isOn = new boolean[120];
21 keyToNote = new int[120];
26 * Plays the appropriate MIDI NoteOn event.
28 public void keyPressed(KeyEvent e) {
30 // Retrieves the notenumber from the conversion array.
31 int noteNumber = keyToNote[e.getKeyCode()];
32 // If note is not already on and the key is mapped to a note, sends the NoteOn event.
33 if (!isOn[noteNumber] && noteNumber > 0) Moosique.getActiveChannel().noteOn(noteNumber, 127);
34 isOn[noteNumber] = true;
35 } catch (ArrayIndexOutOfBoundsException x) {
41 * Plays the appropriate MIDI NoteOff event.
43 public void keyReleased(KeyEvent e) {
45 // Retrieves the notenumber from the conversion array.
46 int noteNumber = keyToNote[e.getKeyCode()];
47 // Sends the NoteOff event.
48 Moosique.getActiveChannel().noteOff(noteNumber);
49 isOn[noteNumber] = false;
50 } catch (ArrayIndexOutOfBoundsException x) {
56 * Sets the octave of the lower part of the keyboard (default = 4)
57 * @param n the octave to start at
59 public static void setOctave(int n) {
60 if (startNote == 0 || startNote == 108) return;
62 makeKeyboardMapping();
65 /** Maps keycodes (array indices) to MIDI note numbers using the following layout:
67 * 2 3 5 6 7 9 0 => # # # # # # #
68 * q w e r t y u i o p => c d e f g a b c d e
69 * s d g h j l => # # # # # #
70 * z x c v b n m , . => c d e f g a b c d
72 private static void makeKeyboardMapping() {
73 keyToNote[KeyEvent.VK_Q] = startNote;
74 keyToNote[83] = startNote + 1;
75 keyToNote[88] = startNote + 2;
76 keyToNote[68] = startNote + 3;
77 keyToNote[67] = startNote + 4;
78 keyToNote[86] = startNote + 5;
79 keyToNote[71] = startNote + 6;
80 keyToNote[66] = startNote + 7;
81 keyToNote[72] = startNote + 8;
82 keyToNote[78] = startNote + 9;
83 keyToNote[74] = startNote + 10;
84 keyToNote[77] = startNote + 11;
85 keyToNote[44] = startNote + 12;
86 keyToNote[76] = startNote + 13;
87 keyToNote[46] = startNote + 14;
88 keyToNote[81] = startNote + 12;
89 keyToNote[50] = startNote + 13;
90 keyToNote[87] = startNote + 14;
91 keyToNote[51] = startNote + 15;
92 keyToNote[69] = startNote + 16;
93 keyToNote[82] = startNote + 17;
94 keyToNote[53] = startNote + 18;
95 keyToNote[84] = startNote + 19;
96 keyToNote[54] = startNote + 20;
97 keyToNote[89] = startNote + 21;
98 keyToNote[55] = startNote + 22;
99 keyToNote[85] = startNote + 23;
100 keyToNote[73] = startNote + 24;
101 keyToNote[57] = startNote + 25;
102 keyToNote[79] = startNote + 26;
103 keyToNote[48] = startNote + 27;
104 keyToNote[80] = startNote + 28;