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Add shuffle functionality to Carpeggio to mix up notes on the grid #105

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Add shuffle functionality to Carpeggio to mix up notes on the grid #105

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36 changes: 35 additions & 1 deletion software/o_c_REV/HEM_Carpeggio.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -86,14 +86,25 @@ public:
cursor = 0; // Don't advance cursor when chord is changed
ImprintChord(chord);
}
if (++cursor > 2) cursor = 0;
if (++cursor > 3) cursor = 0;
ResetCursor();
}

void OnEncoderMove(int direction) {
if (cursor == 0) sequence[step] = constrain(sequence[step] += direction, -24, 60);
if (cursor == 1) chord = constrain(chord += direction, 0, Nr_of_arp_chords - 1);
if (cursor == 2) transpose = constrain(transpose += direction, -24, 24);
if (cursor == 3) {
// only imprint cord when turning left from shuffle
if (shuffle && direction < 0) {
ImprintChord(sel_chord);
}
// shuffle chord every time we turn right
if (direction > 0) {
ShuffleChord();
}

}
if (cursor != 1) replay = 1;
}

Expand Down Expand Up @@ -131,6 +142,7 @@ private:
int chord; // Selected chord
int sel_chord; // Most recently-imprinted chord
int transpose; // Transposition setting (-24 ~ +24)
bool shuffle = false;

// Variables to handle imprint confirmation animation
int confirm_animation_countdown;
Expand All @@ -150,6 +162,12 @@ private:
gfxPrint(transpose);
if (cursor == 2) gfxCursor(32, 33, 30);

// Shuffle selector
gfxBitmap(37, 36, 8, PLAY_ICON);
gfxBitmap(49, 36, 8, LOOP_ICON);
gfxInvert(36 + (shuffle ? 12 : 0), 35, 10, 10);
if (cursor == 3) gfxCursor(37, 46, 20);

// Note name editor
uint8_t midi_note = constrain(sequence[step] + 36 + transpose, 0, 127);
gfxPrint(38, 50, midi_note_numbers[midi_note]);
Expand Down Expand Up @@ -189,6 +207,22 @@ private:
chord = new_chord;
confirm_animation_position = 16;
confirm_animation_countdown = HEM_CARPEGGIO_ANIMATION_SPEED;
shuffle = false;
}

void ShuffleChord() {
int16_t old; // temp var for note being swapped
int16_t rnd; // temp var for index of note swapping in
for (int i = 0; i < 16; i++) {
// set old to current step value
old = sequence[i];
rnd = random(0, 16);
sequence[i] = sequence[rnd];
sequence[rnd] = old;
}
confirm_animation_position = 16;
confirm_animation_countdown = HEM_CARPEGGIO_ANIMATION_SPEED;
shuffle = true;
}

void pitch_out_for_step() {
Expand Down