C++ Chord::arpeggio方法代码示例

void Glissando::layout()
      {
      Chord* chord = static_cast<Chord*>(parent());
      if (chord == 0)
            return;
      Note* anchor2   = chord->upNote();
      Segment* s = chord->segment();
      s = s->prev1();
      while (s) {
            if ((s->segmentType() & (Segment::SegChordRest)) && s->element(track()))
                  break;
            s = s->prev1();
            }
      if (s == 0) {
            qDebug("no segment for first note of glissando found\n");
            return;
            }
      ChordRest* cr = static_cast<ChordRest*>(s->element(track()));
      if (cr == 0 || cr->type() != CHORD) {
            qDebug("no first note for glissando found, track %d", track());
            return;
            }
      qreal _spatium = spatium();
      Note* anchor1 = static_cast<Chord*>(cr)->upNote();

      setPos(0.0, 0.0);
      adjustReadPos();

      QPointF cp1    = anchor1->pagePos();
      QPointF cp2    = anchor2->pagePos();

      // line starting point
      int dots = static_cast<Chord*>(cr)->dots();
      LedgerLine * ledLin = static_cast<Chord*>(cr)->ledgerLines();
      // if dots, from right of last dot (assume a standard dot with of 1/4 sp)
      // if no dots, from right of ledger line, if any; from right of note head, if no ledger line
      qreal x1 = (dots ? anchor1->dot(dots-1)->pos().x() + anchor1->dot(dots-1)->width()
                  : (ledLin ? ledLin->pos().x() + ledLin->width() : anchor1->headWidth()) )
            - (cp2.x() - cp1.x());              // make relative to end note
      qreal y1 = anchor1->pos().y();
      // line end point: left of note head
      qreal x2 = anchor2->pos().x();
      qreal y2 = anchor2->pos().y();

      // angle glissando between notes with the same pitch letter
      if (anchor1->line() == anchor2->line()) {
            int upDown = anchor2->pitch() - anchor1->pitch();
            if (upDown != 0)
                  upDown /= abs(upDown);
            y1 += _spatium * 0.25 * upDown;
            y2 -= _spatium * 0.25 * upDown;
            }

      // on TAB's, adjust lower end point from string line height to base of note height (= ca. half line spacing)
      if (chord->staff()->isTabStaff()) {
            qreal yOff = chord->staff()->lineDistance() * 0.3 * _spatium;
            if (anchor1->pitch() > anchor2->pitch()) {  // descending glissando:
                  y2 += yOff;
                  y1 -= yOff;
                  }                                     // move ending point to base of note
            else {                                      // ascending glissando:
                  y1 += yOff;                               // move starting point to base of note
                  y2 -= yOff;
                  }
            }

      // shorten line to avoid end note ledger line
      ledLin=anchor2->chord()->ledgerLines();
      if (ledLin)
            x2 = ledLin->pos().x();
      // shorten line so it doesn't go through end note accidental or arpeggio
      if (Accidental* a = anchor2->accidental()) {
            x2 = a->pos().x() + a->userOff().x();
            }
      if (Arpeggio* a = chord->arpeggio()) {
            x2 = a->pos().x() + a->userOff().x();
            }

      QLineF fullLine(x1, y1, x2, y2);

      // shorten line on each side by offsets
      qreal xo = _spatium * .5;
      qreal yo = xo;   // spatium() * .5;
      QPointF p1 = fullLine.pointAt(xo / fullLine.length());
      QPointF p2 = fullLine.pointAt(1 - (yo / fullLine.length()));

      line = QLineF(p1, p2);
      qreal lw = _spatium * .15 * .5;
      QRectF r = QRectF(line.p1(), line.p2()).normalized();
      setbbox(r.adjusted(-lw, -lw, lw, lw));
      }

//.........这里部分代码省略.........
      ChordRest* cr = static_cast<ChordRest*>(s1->element(track()));
      if (cr == 0 || cr->type() != Element::Type::CHORD) {
            qDebug("no first note for glissando found, track %d", track());
            return;
            }
      qreal _spatium = spatium();
      Note* anchor1 = static_cast<Chord*>(cr)->upNote();

      setPos(0.0, 0.0);
      adjustReadPos();

      // since line will be drawn relative to end note,
      // calculate offsets for start note coordinates relative to end note
      qreal x1off = 0.0;
      qreal y1off = 0.0;
      QPointF cp1 = anchor1->pagePos();
      QPointF cp2 = anchor2->pagePos();

      // layout of glissandi happens before we have staff positions within the system
      // so these "page" positions are not accurate across different staves
      // cheap partial fix for cross-staff glissandi: adjust vertical position according to difference in staffMove
      int moveDiff   = anchor2->chord()->staffMove() - anchor1->chord()->staffMove();
      if (moveDiff)
            y1off = moveDiff * 4.0 * _spatium;

      // now calculate offsets
      if (s1->system() == s2->system()) {
            // normal case - start and end note in same system
            x1off = cp2.x() - cp1.x();
            if (!moveDiff)
                  y1off = cp2.y() - cp1.y();
            }
      else {
            // cheap partial fix for cross system glissandi: just draw a short line into end note
            // TODO: draw line coming out of start note on previous system
            x1off = 4.0 * _spatium;
            if (!moveDiff)
                  y1off = anchor2->pos().y() - anchor1->pos().y();
            }

      // line starting point
      int dots = static_cast<Chord*>(cr)->dots();
      LedgerLine * ledLin = static_cast<Chord*>(cr)->ledgerLines();
      // if dots, from right of last dot (assume a standard dot with of 1/4 sp)
      // if no dots, from right of ledger line, if any; from right of note head, if no ledger line
      qreal x1 = (dots && anchor1->dot(dots-1) ? anchor1->dot(dots-1)->pos().x() + anchor1->dot(dots-1)->width()
                  : (ledLin ? ledLin->pos().x() + ledLin->width() : anchor1->headWidth()) )
            - x1off;                            // make relative to end note
      qreal y1 = anchor2->y() - y1off;
      // line end point: left of note head
      qreal x2 = anchor2->pos().x();
      qreal y2 = anchor2->pos().y();

      // angle glissando between notes with the same pitch letter
      if (anchor1->line() == anchor2->line()) {
            int upDown = anchor2->pitch() - anchor1->pitch();
            if (upDown != 0)
                  upDown /= abs(upDown);
            y1 += _spatium * 0.25 * upDown;
            y2 -= _spatium * 0.25 * upDown;
            }

      // on TAB's, adjust lower end point from string line height to base of note height (= ca. half line spacing)
      if (chord->staff()->isTabStaff()) {
            qreal yOff = chord->staff()->lineDistance() * 0.3 * _spatium;
            if (anchor1->pitch() > anchor2->pitch()) {  // descending glissando:
                  y2 += yOff;
                  y1 -= yOff;
                  }                                     // move ending point to base of note
            else {                                      // ascending glissando:
                  y1 += yOff;                               // move starting point to base of note
                  y2 -= yOff;
                  }
            }

      // shorten line to avoid end note ledger line
      ledLin = anchor2->chord()->ledgerLines();
      if (ledLin)
            x2 = ledLin->pos().x();
      // shorten line so it doesn't go through end note accidental or arpeggio
      if (Accidental* a = anchor2->accidental()) {
            x2 = a->pos().x() + a->userOff().x();
            }
      if (Arpeggio* a = chord->arpeggio()) {
            x2 = a->pos().x() + a->userOff().x();
            }

      QLineF fullLine(x1, y1, x2, y2);

      // shorten line on each side by offsets
      qreal xo = _spatium * .5;
      qreal yo = xo;   // spatium() * .5;
      QPointF p1 = fullLine.pointAt(xo / fullLine.length());
      QPointF p2 = fullLine.pointAt(1 - (yo / fullLine.length()));

      line = QLineF(p1, p2);
      qreal lw = _spatium * .15 * .5;
      QRectF r = QRectF(line.p1(), line.p2()).normalized();
      setbbox(r.adjusted(-lw, -lw, lw, lw));
      }