X-Git-Url: https://git.cworth.org/git?a=blobdiff_plain;f=scherzo.c;h=b6fda6f1d2288d6deb9c0546c3f08d1890ad7186;hb=7abea8cdc208652e144541c174849d80a1784285;hp=88cae44fe4cdb85bde4669a41e713f463767915c;hpb=05c28164f342656bd02bb4c6607b938bb8d3f2b1;p=scherzo

diff --git a/scherzo.c b/scherzo.c
index 88cae44..b6fda6f 100644
--- a/scherzo.c
+++ b/scherzo.c
@@ -24,6 +24,8 @@
 #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
@@ -48,6 +50,7 @@ typedef struct scherzo
     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;
 
@@ -58,6 +61,19 @@ typedef struct scherzo
     score_note_t **notes_pressed;
 } scherzo_t;
 
+/* Forward declarations. */
+static score_note_t *
+scherzo_add_note (scherzo_t *scherzo, score_pitch_t pitch, int octave);
+
+static void
+scherzo_remove_note (scherzo_t *scherzo, score_pitch_t pitch, int octave);
+
+static void
+_judge_note (scherzo_t *scherzo, score_note_t *note);
+
+static void
+_score_challenge (scherzo_t *scherzo);
+
 static int
 on_delete_event_quit (unused (GtkWidget *widget),
 		      unused (GdkEvent *event),
@@ -92,7 +108,7 @@ on_expose_event_draw (GtkWidget *widget,
     cairo_paint (cr);
 
     /* Add some padding on the sides and top */
-    cairo_translate (cr, pad, 2 * scherzo->staff_height);
+    cairo_translate (cr, pad, scherzo->staff_height);
     score_set_staff_height (score, scherzo->staff_height);
     score_set_width (score, widget_width - 2 * pad);
 
@@ -107,6 +123,13 @@ on_key_press_event (GtkWidget *widget,
 		    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 = 4;
 
     switch (key->keyval) {
     case GDK_KEY_plus:
@@ -128,12 +151,162 @@ on_key_press_event (GtkWidget *widget,
     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;
+    }
+
+    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_add_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 = 4;
+
+    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;
     }
 
-    /* Allow the event to propagate to other handlers. */
+    if ((key->keyval >= GDK_KEY_A && key->keyval <= GDK_KEY_G) ||
+	(key->keyval >= GDK_KEY_a && key->keyval <= GDK_KEY_g))
+    {
+	scherzo_remove_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,
@@ -182,17 +355,172 @@ _midi_to_score_pitch_and_octave (unsigned char midi_note,
     }
 }
 
+/* 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;
+    unsigned i, num_notes = scherzo->num_notes_pressed;
+    int bass_pitch;
+    const char *chord_name = NULL;
+
+    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 = 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 (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 score_note_t *
-scherzo_add_note_midi (scherzo_t *scherzo, unsigned char midi_note)
+scherzo_add_note (scherzo_t *scherzo, score_pitch_t pitch, int octave)
 {
     score_staff_t *staff;
-    score_pitch_t pitch;
-    int octave;
     score_note_t *note;
+    int i;
 
-    staff = scherzo->challenge.staff;
+    if (scherzo->challenge.note)
+	staff = scherzo->challenge.staff;
+    else
+	staff = scherzo->treble;
 
-    _midi_to_score_pitch_and_octave (midi_note, &pitch, &octave);
+    /* 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);
 
@@ -208,19 +536,18 @@ scherzo_add_note_midi (scherzo_t *scherzo, unsigned char midi_note)
 
     scherzo->notes_pressed[scherzo->num_notes_pressed - 1] = note;
 
+    scherzo_analyze_chord (scherzo);
+
     return note;
 }
 
+
 static void
-scherzo_remove_note_midi (scherzo_t *scherzo, unsigned char midi_note)
+scherzo_remove_note (scherzo_t *scherzo, score_pitch_t pitch, int octave)
 {
-    score_pitch_t pitch;
-    int octave;
     score_note_t *note;
     int i;
 
-    _midi_to_score_pitch_and_octave (midi_note, &pitch, &octave);
-
     for (i = 0; i < scherzo->num_notes_pressed; i++) {
 	note = scherzo->notes_pressed[i];
 	if (note->pitch == pitch && note->octave == octave) {
@@ -234,6 +561,31 @@ scherzo_remove_note_midi (scherzo_t *scherzo, unsigned char midi_note)
 	    i--;
 	}
     }
+
+    scherzo_analyze_chord (scherzo);
+}
+
+static score_note_t *
+scherzo_add_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_add_note (scherzo, pitch, octave);
+}
+
+
+static void
+scherzo_remove_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);
+
+    scherzo_remove_note (scherzo, pitch, octave);
 }
 
 void
@@ -321,14 +673,21 @@ _judge_note (scherzo_t *scherzo, score_note_t *note)
 {
     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->satisfied = 1;
+	score_set_note_color_rgb (note, 18/256., 130/256., 28/256.); /* green */
     }
     else
     {
 	challenge->mistaken = 1;
+	score_set_note_color_rgb (note, 184/256., 4/256., 22/256.); /* red */
     }
 }
 
@@ -339,6 +698,9 @@ _score_challenge (scherzo_t *scherzo)
 {
     challenge_t *challenge = &scherzo->challenge;
 
+    if (! challenge->note)
+	return;
+
     if (! challenge->satisfied)
 	return;
 
@@ -358,6 +720,7 @@ on_midi_input (unused (GIOChannel *channel),
     ssize_t remaining;
     snd_seq_event_t event;
     score_note_t *note;
+    int need_redraw = FALSE;
 
     remaining = read (scherzo->midi_fd, buf, MIDI_BUF_SIZE);
 
@@ -378,12 +741,12 @@ on_midi_input (unused (GIOChannel *channel),
 	case SND_SEQ_EVENT_NOTEON:
 	    note = scherzo_add_note_midi (scherzo, event.data.note.note);
 	    _judge_note (scherzo, note);
-	    gtk_widget_queue_draw (scherzo->window);
+	    need_redraw = TRUE;
 	    break;
 	case SND_SEQ_EVENT_NOTEOFF:
 	    scherzo_remove_note_midi (scherzo, event.data.note.note);
 	    _score_challenge (scherzo);
-	    gtk_widget_queue_draw (scherzo->window);
+	    need_redraw = TRUE;
 	    break;
 	case SND_SEQ_EVENT_CLOCK:
 	    /* Ignore for now as my piano sends a constant stream of these. */
@@ -397,7 +760,10 @@ on_midi_input (unused (GIOChannel *channel),
 	    break;
 	}
     }
-    
+
+    if (need_redraw)
+	gtk_widget_queue_draw (scherzo->window);
+
     /* Return TRUE to continue to get called in the future. */
     return TRUE;
 }
@@ -416,22 +782,26 @@ main (int argc, char *argv[])
     scherzo.ctx = talloc_new (NULL);
 
     scherzo.score = score_create (scherzo.ctx);
-    scherzo.staff_height = 48;
+    scherzo.staff_height = 100;
     score_set_staff_height (scherzo.score, scherzo.staff_height);
 
     score_add_brace (scherzo.score, 2);
     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_init (&scherzo.mnemon);
     /* XXX: Should create a default file if one cannot be loaded. */
-    mnemon_load_category (&scherzo.mnemon, "scherzo");
+    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) {
@@ -453,7 +823,7 @@ main (int argc, char *argv[])
 
     scherzo.window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
 
-    gtk_window_set_default_size (GTK_WINDOW (scherzo.window), 600, 400);
+    gtk_window_set_default_size (GTK_WINDOW (scherzo.window), 1000, 600);
 
     g_signal_connect (scherzo.window, "delete-event",
 		      G_CALLBACK (on_delete_event_quit), NULL);
@@ -466,9 +836,13 @@ main (int argc, char *argv[])
 		      G_CALLBACK (on_expose_event_draw),
 		      &scherzo);
 
-    g_signal_connect (scherzo.window, "key-press-event",  
+    g_signal_connect (scherzo.window, "key-press-event",
 		      G_CALLBACK (on_key_press_event),
 		      &scherzo);
+
+    g_signal_connect (scherzo.window, "key-release-event",
+		      G_CALLBACK (on_key_release_event),
+		      &scherzo);
     
     gtk_widget_show_all (scherzo.window);