#include "score.h"
#include "mnemon.h"
+#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof(arr[0]))
+
#define unused(foo) foo __attribute__((unused))
#define MIDI_BUF_SIZE 4096
int staff_height;
score_staff_t *treble;
score_staff_t *bass;
+ score_chord_t *chord;
int midi_fd;
snd_midi_event_t *snd_midi_event;
void *user_data)
{
scherzo_t *scherzo = user_data;
- int octave = scherzo->challenge.note->octave;
+ int octave;
score_pitch_t pitch;
+ if (scherzo->challenge.note)
+ octave = scherzo->challenge.note->octave;
+ else
+ octave = 4;
+
switch (key->keyval) {
case GDK_KEY_plus:
case GDK_KEY_KP_Add:
void *user_data)
{
scherzo_t *scherzo = user_data;
- int octave = scherzo->challenge.note->octave;
+ int octave;
score_pitch_t pitch;
+ if (scherzo->challenge.note)
+ octave = scherzo->challenge.note->octave;
+ else
+ octave = 4;
+
switch (key->keyval) {
case GDK_KEY_c:
case GDK_KEY_C:
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,
}
}
+/* 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++;
+ }
+ }
+
+ return 1;
+}
+
+static void
+scherzo_analyze_chord (scherzo_t *scherzo)
+{
+ void *local = talloc_new (NULL);
+ analyzed_note_t *notes;
+ unsigned i, num_notes = scherzo->num_notes_pressed;
+ int bass_pitch;
+ const char *chord_name = NULL;
+
+ 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" }
+ };
+
+ if (scherzo->chord) {
+ score_remove_chord (scherzo->chord);
+ scherzo->chord = NULL;
+ }
+
+ if (num_notes == 0)
+ 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 = scherzo->notes_pressed[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;
+ }
+
+ 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 < num_sevenths; i++) {
+ if (_chord_signature_matches (notes, num_notes, seventh[i].pitches, 4))
+ chord_name = seventh[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 score_note_t *
scherzo_add_note (scherzo_t *scherzo, score_pitch_t pitch, int octave)
{
score_staff_t *staff;
score_note_t *note;
+ int i;
- staff = scherzo->challenge.staff;
+ if (scherzo->challenge.note)
+ staff = scherzo->challenge.staff;
+ else
+ staff = scherzo->treble;
+
+ /* Do nothing if this note is already pressed. */
+ for (i = 0; i < scherzo->num_notes_pressed; i++) {
+ if (scherzo->notes_pressed[i]->pitch == pitch &&
+ scherzo->notes_pressed[i]->octave == octave)
+ {
+ return scherzo->notes_pressed[i];
+ }
+ }
note = score_add_note (staff, pitch, octave, SCORE_DURATION_WHOLE);
scherzo->notes_pressed[scherzo->num_notes_pressed - 1] = note;
+ scherzo_analyze_chord (scherzo);
+
return note;
}
i--;
}
}
+
+ scherzo_analyze_chord (scherzo);
}
static score_note_t *
{
challenge_t *challenge = &scherzo->challenge;
+ if (! scherzo->challenge.note) {
+ score_set_note_color_rgb (note, 0.0, 0.0, 0.0); /* black */
+ return;
+ }
+
if (note->pitch == challenge->note->pitch &&
note->octave == challenge->note->octave)
{
{
challenge_t *challenge = &scherzo->challenge;
+ if (! challenge->note)
+ return;
+
if (! challenge->satisfied)
return;
scherzo.treble = score_add_staff (scherzo.score, SCORE_CLEF_G);
scherzo.bass = score_add_staff (scherzo.score, SCORE_CLEF_F);
+ scherzo.chord = NULL;
+
scherzo.num_notes_pressed = 0;
scherzo.notes_pressed = NULL;
mnemon_load_category (&scherzo.mnemon, "scherzo-notes");
scherzo.challenge.note = NULL;
+/*
_select_challenge (&scherzo);
+*/
err = snd_midi_event_new (MIDI_BUF_SIZE, &scherzo.snd_midi_event);
if (err) {
{
score_clef_t clef;
+ score_chord_t **chords;
+ int num_chords;
+
score_note_t **notes;
int num_notes;
return c_line - (name - SCORE_PITCH_NAME_C) / 2.0 - 3.5 * (note->octave - 4);
}
+/* chord->width is updated as a side effect */
+static void
+_draw_chord (score_t *score, cairo_t *cr,
+ score_staff_t *staff, score_chord_t *chord)
+{
+ cairo_text_extents_t chord_extents;
+ double total_staff_height;
+
+ /* XXX: The staff should manage this height itself. */
+ total_staff_height = (staff->upper_ledger_lines * score->space_height +
+ score->staff_height +
+ staff->lower_ledger_lines * score->space_height);
+
+ cairo_save (cr);
+
+ cairo_text_extents (cr, chord->name, &chord_extents);
+
+ cairo_select_font_face (cr, "serif", 0, 0);
+ cairo_set_font_size (cr, score->space_height * 3);
+
+ if (staff->clef == SCORE_CLEF_G)
+ cairo_move_to (cr, 0, - score->space_height * 0.5);
+ else
+ cairo_move_to (cr, 0, score->space_height * 0.5 + total_staff_height + chord_extents.y_bearing);
+
+ cairo_show_text (cr, chord->name);
+
+ chord->width = chord_extents.x_advance;
+
+ cairo_restore (cr);
+}
+
static void
_draw_note (score_t *score, cairo_t *cr,
score_staff_t *staff, score_note_t *note)
/* Make space for clef before drawing notes */
cairo_translate (cr, (int) (4 * score->space_height), 0);
+ /* Draw chord symbols */
+ cairo_save (cr);
+ {
+ for (i = 0; i < staff->num_chords; i++) {
+ _draw_chord (score, cr, staff, staff->chords[i]);
+ cairo_translate (cr, staff->chords[i]->width, 0.0);
+ }
+ }
+ cairo_restore (cr);
+
/* Draw notes */
for (i = 0; i < staff->num_notes; i++) {
_draw_note (score, cr, staff, staff->notes[i]);
staff->notes = NULL;
staff->num_notes = 0;
+ staff->chords = NULL;
+ staff->num_chords = 0;
+
staff->upper_ledger_lines = 0;
staff->lower_ledger_lines = 0;
return staff;
}
+score_chord_t *
+score_add_chord (score_staff_t *staff,
+ const char *name)
+{
+ score_chord_t *chord;
+
+ chord = talloc (staff, score_chord_t);
+ if (chord == NULL)
+ return NULL;
+
+ chord->staff = staff;
+ chord->name = talloc_strdup (chord, name);
+
+ /* The width will get set correctly the first time _draw_chord is
+ * called. */
+ chord->width = 0.0;
+
+ staff->num_chords++;
+ staff->chords = talloc_realloc (staff,
+ staff->chords,
+ score_chord_t*,
+ staff->num_chords);
+ if (staff->chords == NULL) {
+ staff->num_chords = 0;
+ return NULL;
+ }
+
+ staff->chords[staff->num_chords - 1] = chord;
+
+ return chord;
+}
+
+void
+score_remove_chord (score_chord_t *chord)
+{
+ score_staff_t *staff = chord->staff;
+ int i;
+
+ for (i = 0; i < staff->num_chords; i++)
+ if (staff->chords[i] == chord)
+ break;
+
+ if (i == staff->num_chords)
+ return;
+
+ if (i < staff->num_chords - 1)
+ {
+ memmove (staff->chords + i,
+ staff->chords + i + 1,
+ (staff->num_chords - 1 - i) * sizeof (score_chord_t *));
+ }
+
+ staff->num_chords -= 1;
+}
+
score_note_t *
score_add_note (score_staff_t *staff,
score_pitch_t pitch,