void StringData::fretChords(Chord * chord) const
{
int nFret, nNewFret, nTempFret;
int nString, nNewString, nTempString;
if(bFretting)
return;
bFretting = true;
// we need to keep track of each string we allocate ourselves within this algorithm
bool bUsed[strings()]; // initially all strings are available
for(nString=0; nString<strings(); nString++)
bUsed[nString] = false;
// we also need the notes sorted in order of string (from highest to lowest) and then pitch
QMap<int, Note *> sortedNotes;
int count = 0;
// if chord parent is not a segment, the chord is special (usually a grace chord):
// fret it by itself, ignoring the segment
if (chord->parent()->type() != Element::Type::SEGMENT)
sortChordNotes(sortedNotes, chord, &count);
else {
// scan each chord of seg from same staff as 'chord', inserting each of its notes in sortedNotes
Segment* seg = chord->segment();
int trk;
int trkFrom = (chord->track() / VOICES) * VOICES;
int trkTo = trkFrom + VOICES;
for(trk = trkFrom; trk < trkTo; ++trk) {
Element* ch = seg->elist().at(trk);
if (ch && ch->type() == Element::Type::CHORD)
sortChordNotes(sortedNotes, static_cast<Chord*>(ch), &count);
}
}
// scan chord notes from highest, matching with strings from the highest
foreach(Note * note, sortedNotes) {
nString = nNewString = note->string();
nFret = nNewFret = note->fret();
note->setFretConflict(false); // assume no conflicts on this note
// if no fretting yet or current fretting is no longer valid
if (nString == STRING_NONE || nFret == FRET_NONE || getPitch(nString, nFret) != note->pitch()) {
// get a new fretting
if(!convertPitch(note->pitch(), &nNewString, &nNewFret) ) {
// no way to fit this note in this tab:
// mark as fretting conflict
note->setFretConflict(true);
// store fretting change without affecting chord context
if (nFret != nNewFret)
note->score()->undoChangeProperty(note, P_ID::FRET, nNewFret);
if (nString != nNewString)
note->score()->undoChangeProperty(note, P_ID::STRING, nNewString);
continue;
}
// check this note is not using the same string of another note of this chord
foreach(Note * note2, sortedNotes) {
// if same string...
if(note2 != note && note2->string() == nNewString) {
// ...attempt to fret this note on its old string
if( (nTempFret=fret(note->pitch(), nString)) != FRET_NONE) {
nNewFret = nTempFret;
nNewString = nString;
}
break;
}
}
}
// check we are not reusing a string we already used
if(bUsed[nNewString]) {
// ...try with each other string, from the highest
for(nTempString=0; nTempString < strings(); nTempString++) {
if(bUsed[nTempString])
continue;
if( (nTempFret=fret(note->pitch(), nTempString)) != FRET_NONE) {
// suitable string found
nNewFret = nTempFret;
nNewString = nTempString;
break;
}
}
// if we run out of strings
if(nTempString >= strings()) {
// no way to fit this chord in this tab:
// mark this note as fretting conflict
note->setFretConflict(true);
// continue;
}
}
// if fretting did change, store as a fret change
if (nFret != nNewFret)
note->score()->undoChangeProperty(note, P_ID::FRET, nNewFret);
if (nString != nNewString)
note->score()->undoChangeProperty(note, P_ID::STRING, nNewString);
bUsed[nNewString] = true; // string is used
}
void StringData::fretChords(Chord * chord) const
{
int nFret, minFret, maxFret, nNewFret, nTempFret;
int nString, nNewString, nTempString;
if(bFretting)
return;
bFretting = true;
// we need to keep track of string allocation
int bUsed[strings()]; // initially all strings are available
for(nString=0; nString<strings(); nString++)
bUsed[nString] = 0;
// we also need the notes sorted in order of string (from highest to lowest) and then pitch
QMap<int, Note *> sortedNotes;
int count = 0;
// store staff pitch offset at this tick, to speed up actual note pitch calculations
// (ottavas not implemented yet)
int transp = chord->staff() ? chord->part()->instrument()->transpose().chromatic : 0; // TODO: tick?
int pitchOffset = /*chord->staff()->pitchOffset(chord->segment()->tick())*/ - transp;
// if chord parent is not a segment, the chord is special (usually a grace chord):
// fret it by itself, ignoring the segment
if (chord->parent()->type() != ElementType::SEGMENT)
sortChordNotes(sortedNotes, chord, pitchOffset, &count);
else {
// scan each chord of seg from same staff as 'chord', inserting each of its notes in sortedNotes
Segment* seg = chord->segment();
int trk;
int trkFrom = (chord->track() / VOICES) * VOICES;
int trkTo = trkFrom + VOICES;
for(trk = trkFrom; trk < trkTo; ++trk) {
Element* ch = seg->elist().at(trk);
if (ch && ch->type() == ElementType::CHORD)
sortChordNotes(sortedNotes, toChord(ch), pitchOffset, &count);
}
}
// determine used range of frets
minFret = INT32_MAX;
maxFret = INT32_MIN;
foreach(Note* note, sortedNotes) {
if (note->string() != STRING_NONE)
bUsed[note->string()]++;
if (note->fret() != FRET_NONE && note->fret() < minFret)
minFret = note->fret();
if (note->fret() != FRET_NONE && note->fret() > maxFret)
maxFret = note->fret();
}
// scan chord notes from highest, matching with strings from the highest
foreach(Note * note, sortedNotes) {
nString = nNewString = note->string();
nFret = nNewFret = note->fret();
note->setFretConflict(false); // assume no conflicts on this note
// if no fretting (any invalid fretting has been erased by sortChordNotes() )
if (nString == STRING_NONE /*|| nFret == FRET_NONE || getPitch(nString, nFret) != note->pitch()*/) {
// get a new fretting
if (!convertPitch(note->pitch(), pitchOffset, &nNewString, &nNewFret) ) {
// no way to fit this note in this tab:
// mark as fretting conflict
note->setFretConflict(true);
// store fretting change without affecting chord context
if (nFret != nNewFret)
note->undoChangeProperty(Pid::FRET, nNewFret);
if (nString != nNewString)
note->undoChangeProperty(Pid::STRING, nNewString);
continue;
}
// note can be fretted: use string
else {
bUsed[nNewString]++;
}
}
// if the note string (either original or newly assigned) is also used by another note
if (bUsed[nNewString] > 1) {
// attempt to find a suitable string, from topmost
for (nTempString=0; nTempString < strings(); nTempString++) {
if (bUsed[nTempString] < 1
&& (nTempFret=fret(note->pitch(), nTempString, pitchOffset)) != FRET_NONE) {
bUsed[nNewString]--; // free previous string
bUsed[nTempString]++; // and occupy new string
nNewFret = nTempFret;
nNewString = nTempString;
break;
}
}
}
// TODO : try to optimize used fret range, avoiding eccessively open positions
// if fretting did change, store as a fret change
if (nFret != nNewFret)
note->undoChangeProperty(Pid::FRET, nNewFret);
if (nString != nNewString)
note->undoChangeProperty(Pid::STRING, nNewString);
}