+
+ /* Add some padding on the sides and top */
+ cairo_translate (cr, pad, scherzo->staff_height);
+ score_set_staff_height (score, scherzo->staff_height);
+ score_set_width (score, widget_width - 2 * pad);
+
+ score_draw (score, cr);
+
+ return TRUE;
+}
+
+static int
+on_key_press_event (GtkWidget *widget,
+ GdkEventKey *key,
+ void *user_data)
+{
+ scherzo_t *scherzo = user_data;
+ int octave;
+ score_pitch_t pitch;
+
+ if (scherzo->challenge.note)
+ octave = scherzo->challenge.note->octave;
+ else
+ octave = scherzo->keyboard_octave;
+
+ switch (key->keyval) {
+ case GDK_KEY_plus:
+ case GDK_KEY_KP_Add:
+ case GDK_KEY_equal:
+ case GDK_KEY_KP_Equal:
+ scherzo->staff_height += 4;
+ gtk_widget_queue_draw (widget);
+ return TRUE;
+ break;
+ case GDK_KEY_minus:
+ case GDK_KEY_KP_Subtract:
+ scherzo->staff_height -= 4;
+ gtk_widget_queue_draw (widget);
+ return TRUE;
+ break;
+ case GDK_KEY_q:
+ case GDK_KEY_Q:
+ case GDK_KEY_Escape:
+ gtk_main_quit ();
+ return FALSE;
+ case GDK_KEY_c:
+ case GDK_KEY_C:
+ pitch = SCORE_PITCH_C;
+ break;
+ case GDK_KEY_d:
+ case GDK_KEY_D:
+ pitch = SCORE_PITCH_D;
+ break;
+ case GDK_KEY_e:
+ case GDK_KEY_E:
+ pitch = SCORE_PITCH_E;
+ break;
+ case GDK_KEY_f:
+ case GDK_KEY_F:
+ pitch = SCORE_PITCH_F;
+ break;
+ case GDK_KEY_g:
+ case GDK_KEY_G:
+ pitch = SCORE_PITCH_G;
+ break;
+ case GDK_KEY_a:
+ case GDK_KEY_A:
+ pitch = SCORE_PITCH_A;
+ break;
+ case GDK_KEY_b:
+ case GDK_KEY_B:
+ pitch = SCORE_PITCH_B;
+ break;
+ case GDK_KEY_0:
+ case GDK_KEY_1:
+ case GDK_KEY_2:
+ case GDK_KEY_3:
+ case GDK_KEY_4:
+ case GDK_KEY_5:
+ case GDK_KEY_6:
+ case GDK_KEY_7:
+ case GDK_KEY_8:
+ scherzo->keyboard_octave = key->keyval - GDK_KEY_0;
+ break;
+ case GDK_KEY_space:
+ scherzo_press_pedal (scherzo);
+ break;
+ }
+
+ if ((key->keyval >= GDK_KEY_A && key->keyval <= GDK_KEY_G) ||
+ (key->keyval >= GDK_KEY_a && key->keyval <= GDK_KEY_g))
+ {
+ score_note_t *note;
+
+ note = scherzo_press_note (scherzo, pitch, octave);
+ _judge_note (scherzo, note);
+ gtk_widget_queue_draw (scherzo->window);
+
+ return TRUE;
+ }
+
+
+ /* Allow an unhandled event to propagate to other handlers. */
+ return FALSE;
+}
+
+static int
+on_key_release_event (unused (GtkWidget *widget),
+ GdkEventKey *key,
+ void *user_data)
+{
+ scherzo_t *scherzo = user_data;
+ int octave;
+ score_pitch_t pitch;
+
+ if (scherzo->challenge.note)
+ octave = scherzo->challenge.note->octave;
+ else
+ octave = scherzo->keyboard_octave;
+
+ switch (key->keyval) {
+ case GDK_KEY_c:
+ case GDK_KEY_C:
+ pitch = SCORE_PITCH_C;
+ break;
+ case GDK_KEY_d:
+ case GDK_KEY_D:
+ pitch = SCORE_PITCH_D;
+ break;
+ case GDK_KEY_e:
+ case GDK_KEY_E:
+ pitch = SCORE_PITCH_E;
+ break;
+ case GDK_KEY_f:
+ case GDK_KEY_F:
+ pitch = SCORE_PITCH_F;
+ break;
+ case GDK_KEY_g:
+ case GDK_KEY_G:
+ pitch = SCORE_PITCH_G;
+ break;
+ case GDK_KEY_a:
+ case GDK_KEY_A:
+ pitch = SCORE_PITCH_A;
+ break;
+ case GDK_KEY_b:
+ case GDK_KEY_B:
+ pitch = SCORE_PITCH_B;
+ break;
+ case GDK_KEY_space:
+ scherzo_release_pedal (scherzo);
+ break;
+ }
+
+ if ((key->keyval >= GDK_KEY_A && key->keyval <= GDK_KEY_G) ||
+ (key->keyval >= GDK_KEY_a && key->keyval <= GDK_KEY_g))
+ {
+ scherzo_release_note (scherzo, pitch, octave);
+ _score_challenge (scherzo);
+ gtk_widget_queue_draw (scherzo->window);
+
+ return TRUE;
+ }
+
+
+ /* Allow an unhandled event to propagate to other handlers. */
+ return FALSE;
+}
+
+static unsigned char
+_score_pitch_and_octave_to_midi (score_pitch_t pitch,
+ int octave)
+{
+ unsigned char midi_note = 12 * (octave + 1);
+
+ switch (SCORE_PITCH_NAME (pitch)) {
+ case SCORE_PITCH_NAME_C:
+ break;
+ case SCORE_PITCH_NAME_D:
+ midi_note += 2;
+ break;
+ case SCORE_PITCH_NAME_E:
+ midi_note += 4;
+ break;
+ case SCORE_PITCH_NAME_F:
+ midi_note += 5;
+ break;
+ case SCORE_PITCH_NAME_G:
+ midi_note += 7;
+ break;
+ case SCORE_PITCH_NAME_A:
+ midi_note += 9;
+ break;
+ case SCORE_PITCH_NAME_B:
+ midi_note += 11;
+ break;
+ }
+
+ switch (SCORE_PITCH_ACCIDENTAL (pitch)) {
+ case SCORE_PITCH_ACCIDENTAL_DOUBLE_FLAT:
+ midi_note -= 2;
+ break;
+ case SCORE_PITCH_ACCIDENTAL_FLAT:
+ midi_note -= 1;
+ break;
+ case SCORE_PITCH_ACCIDENTAL_NATURAL:
+ break;
+ case SCORE_PITCH_ACCIDENTAL_SHARP:
+ midi_note += 1;
+ break;
+ case SCORE_PITCH_ACCIDENTAL_DOUBLE_SHARP:
+ midi_note += 2;
+ break;
+ }
+
+ return midi_note;
+}
+
+static void
+_midi_to_score_pitch_and_octave (unsigned char midi_note,
+ score_pitch_t *pitch,
+ int *octave)
+{
+ *octave = midi_note / 12 - 1;
+
+ switch (midi_note % 12)
+ {
+ case 0:
+ *pitch = SCORE_PITCH_C;
+ break;
+ case 1:
+ *pitch = SCORE_PITCH_Cs;
+ break;
+ case 2:
+ *pitch = SCORE_PITCH_D;
+ break;
+ case 3:
+ *pitch = SCORE_PITCH_Ds;
+ break;
+ case 4:
+ *pitch = SCORE_PITCH_E;
+ break;
+ case 5:
+ *pitch = SCORE_PITCH_F;
+ break;
+ case 6:
+ *pitch = SCORE_PITCH_Fs;
+ break;
+ case 7:
+ *pitch = SCORE_PITCH_G;
+ break;
+ case 8:
+ *pitch = SCORE_PITCH_Gs;
+ break;
+ case 9:
+ *pitch = SCORE_PITCH_A;
+ break;
+ case 10:
+ *pitch = SCORE_PITCH_As;
+ break;
+ case 11:
+ *pitch = SCORE_PITCH_B;
+ break;
+ }
+}
+
+/* Determine a chord name (if any) from the current notes pressed */
+
+typedef struct analyzed_note {
+ /* Original note being analzyed. */
+ score_note_t *note;
+
+ /* Absolute pitch (expressed as midi number). */
+ int midi_pitch;
+
+ /* Pitch relative to bass note. */
+ int relative_pitch;
+} analyzed_note_t;
+
+static int
+_compare_analyzed_note (const void *va, const void *vb)
+{
+ const analyzed_note_t *a = va, *b = vb;
+
+ return a->midi_pitch - b->midi_pitch;
+}
+
+static int
+_chord_signature_matches (analyzed_note_t *notes,
+ int num_notes,
+ int *signature_pitches,
+ int num_signature_pitches)
+{
+ int n, s;
+
+ for (n = 0, s = 0; s < num_signature_pitches; s++) {
+ if (n >= num_notes)
+ return 0;
+ if (notes[n].relative_pitch != signature_pitches[s])
+ return 0;
+ n++;
+ /* Skip repeated notes in chord being tested. */
+ while (n < num_notes &&
+ notes[n].relative_pitch == signature_pitches[s])
+ {
+ n++;
+ }
+ }
+
+ /* If there are fewer notes in the signature than in the chord,
+ * then there is no match. */
+ if (n < num_notes)
+ return 0;
+
+ return 1;
+}
+
+static void
+scherzo_analyze_chord (scherzo_t *scherzo)
+{
+ void *local = talloc_new (NULL);
+ analyzed_note_t *notes;
+ note_group_t *note_group;
+ unsigned i, num_notes;
+ int bass_pitch;
+ const char *chord_name = NULL;
+
+ if (scherzo->pedal_pressed)
+ note_group = &scherzo->notes_pedaled;
+ else
+ note_group = &scherzo->notes_pressed;
+
+ num_notes = note_group->num_notes;
+
+ struct { int pitches[2]; const char *name; } intervals[] = {
+ { {0, 1}, "Minor 2nd"},
+ { {0, 2}, "Major 2nd"},
+ { {0, 3}, "Minor 3rd"},
+ { {0, 4}, "Major 3rd"},
+ { {0, 5}, "Perfect 4th"},
+ { {0, 6}, "Diminished 5th/Augmented 4th"},
+ { {0, 7}, "Perfect 5th"},
+ { {0, 8}, "Minor 6th"},
+ { {0, 9}, "Major 6th"},
+ { {0, 10}, "Minor 7th"},
+ { {0, 11}, "Major 7th"}
+ };
+
+ struct { int pitches[3]; const char *name; } triads[] = {
+ { {0, 4, 8}, "Augmented triad" },
+ { {0, 4, 7}, "Major triad" },
+ { {0, 3, 7}, "Minor triad" },
+ { {0, 3, 6}, "Diminished triad" }
+ };
+
+ struct { int pitches[4]; const char *name; } sevenths[] = {
+ { {0, 4, 8, 11}, "Augmented/major 7" },
+ { {0, 4, 7, 11}, "Major 7" },
+ { {0, 4, 7, 10}, "Dominant 7" },
+ { {0, 3, 7, 11}, "Minor/major 7" },
+ { {0, 3, 7, 10}, "Minor 7" },
+ { {0, 3, 6, 10}, "Half-diminished 7" },
+ { {0, 3, 6, 9}, "Diminished 7" },
+ { {0, 4, 8, 10}, "Augmented 7" },
+ { {0, 3, 6, 11}, "Diminished/major 7" },
+ };
+
+ if (scherzo->chord) {
+ score_remove_chord (scherzo->chord);
+ scherzo->chord = NULL;
+ }
+
+ if (num_notes <= 1)
+ goto DONE;
+
+ notes = talloc_array (local, analyzed_note_t, num_notes);
+ if (notes == NULL)
+ goto DONE;
+
+ for (i = 0; i < num_notes; i++) {
+ score_note_t *note = note_group->notes[i];
+ notes[i].note = note;
+ notes[i].midi_pitch = _score_pitch_and_octave_to_midi (note->pitch,
+ note->octave);
+ /* Relative pitch will be filled in after sorting. */
+ notes[i].relative_pitch = 0;
+ }
+
+ qsort (notes, num_notes, sizeof (analyzed_note_t), _compare_analyzed_note);
+
+ bass_pitch = notes[0].midi_pitch;
+
+ for (i = 0; i < num_notes; i++) {
+ notes[i].relative_pitch = notes[i].midi_pitch - bass_pitch;
+ while (notes[i].relative_pitch > 12)
+ notes[i].relative_pitch -= 12;
+ }
+
+ for (i = 0; i < ARRAY_SIZE (intervals); i++) {
+ if (_chord_signature_matches (notes, num_notes, intervals[i].pitches, 2))
+ chord_name = intervals[i].name;
+ }
+
+ for (i = 0; i < ARRAY_SIZE (triads); i++) {
+ if (_chord_signature_matches (notes, num_notes, triads[i].pitches, 3))
+ chord_name = triads[i].name;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(sevenths); i++) {
+ if (_chord_signature_matches (notes, num_notes, sevenths[i].pitches, 4))
+ chord_name = sevenths[i].name;
+ }
+
+ if (chord_name)
+ scherzo->chord = score_add_chord (scherzo->treble, chord_name);
+ else
+ scherzo->chord = score_add_chord (scherzo->treble, "Unknown or not a chord");
+
+DONE:
+ talloc_free (local);
+}
+
+static void
+note_group_init (void *ctx, note_group_t *group)
+{
+ group->ctx = ctx;
+ group->notes = NULL;
+ group->size = 0;
+ group->num_notes = 0;
+}
+
+static void
+note_group_add_note (note_group_t *group, score_note_t *note)
+{
+ group->num_notes++;
+
+ if (group->num_notes > group->size) {
+ group->size++;
+ group->notes = talloc_realloc (group->ctx, group->notes,
+ score_note_t*, group->size);
+
+ if (group->notes == NULL) {
+ fprintf (stderr, "Out of memory.\n");
+ exit (1);
+ }
+ }
+
+ group->notes[group->num_notes - 1] = note;
+}
+
+static void
+note_group_remove_note_at (note_group_t *group, int i)
+{
+ if (i >= group->num_notes) {
+ fprintf (stderr, "Internal error: No note to remove at index %d\n", i);
+ exit (1);
+ }
+
+ if (i < group->num_notes - 1) {
+ memmove (group->notes + i, group->notes + i + 1,
+ (group->num_notes - 1 - i) * sizeof (score_note_t*));
+ }
+ group->num_notes--;
+}
+
+static score_note_t *
+scherzo_press_note (scherzo_t *scherzo, score_pitch_t pitch, int octave)
+{
+ score_staff_t *staff;
+ score_note_t *note;
+ int i;
+
+ if (scherzo->challenge.note) {
+ staff = scherzo->challenge.staff;
+ } else if (octave >= 4) {
+ staff = scherzo->treble;
+ } else {
+ staff = scherzo->bass;
+ }
+
+ /* Do nothing if this note is already pressed. */
+ for (i = 0; i < scherzo->notes_pressed.num_notes; i++) {
+ if (scherzo->notes_pressed.notes[i]->pitch == pitch &&
+ scherzo->notes_pressed.notes[i]->octave == octave)
+ {
+ return scherzo->notes_pressed.notes[i];
+ }
+ }
+
+ note = score_add_note (staff, pitch, octave, SCORE_DURATION_WHOLE);
+
+ note_group_add_note (&scherzo->notes_pressed, note);
+
+ if (scherzo->pedal_pressed)
+ note_group_add_note (&scherzo->notes_pedaled, note);
+
+ scherzo_analyze_chord (scherzo);
+
+ return note;
+}
+
+static void
+scherzo_release_note (scherzo_t *scherzo, score_pitch_t pitch, int octave)
+{
+ score_note_t *note;
+ int i;
+ int found = 0;
+
+ for (i = scherzo->notes_pressed.num_notes - 1; i >=0; i--) {
+ note = scherzo->notes_pressed.notes[i];
+ if (note->pitch == pitch && note->octave == octave) {
+ found = 1;
+ if (! scherzo->pedal_pressed)
+ score_remove_note (note);
+ note_group_remove_note_at (&scherzo->notes_pressed, i);
+ }
+ }
+
+ if (found == 0) {
+ fprintf (stderr, "Internal error: Failed to find note to release.\n");
+ }
+
+ scherzo_analyze_chord (scherzo);
+}
+
+static score_note_t *
+scherzo_press_note_midi (scherzo_t *scherzo, unsigned char midi_note)
+{
+ score_pitch_t pitch;
+ int octave;
+
+ _midi_to_score_pitch_and_octave (midi_note, &pitch, &octave);
+
+ return scherzo_press_note (scherzo, pitch, octave);
+}
+
+static void
+scherzo_release_note_midi (scherzo_t *scherzo, unsigned char midi_note)
+{
+ score_pitch_t pitch;
+ int octave;