Maybe you should have a look at layout.cpp: Score::collectPage() . It
calculates the visible height of systems to determine how many will
fit on a page.
Am 24.04.2016 um 19:28 schrieb Sideways Skullfinger:
This is a follow-up to my recent post about
SysStaff:distanceUp/Down(). The relevant parts of that email thread
are all below.
I am now doing the following to get each staff's height (I was already
collecting the visibleStaves vector, now I'm using it to solve this
requirement too):
/EXISTING //CODE TO COLLECT VISIBLE STAVES/
QVector<int> visibleStaves;
visibleStaves.resize(score->nstaves());
int nVisible = 0;
for (int i = 0; i < score->nstaves(); i++)
visibleStaves[i] = score->staff(i)->invisible() ? -1 : nVisible++;
/NEW //CODE TO GET STAFF TOP AND HEIGHT/
const System* s = page->systems().value(0);
const qreal top = s->staff(idxStaff)->y();
const int idxVisible = (*pVisibleStaves)[idxStaff];
qreal bot = -1;
if (idxVisible < nVisible - 1) {
for (int i = idxStaff + 1; i < pVisibleStaves->size(); i++) {
if ((*pVisibleStaves)[i] > 0) {
bot = s->staff(i)->y();
break;
}
}
}
if (bot < 0)
bot = page->height() - page->bm();
height = bot - top; It's SVG and the y-axis values increment
top-to-bottom. The new code is inside a separate sub-routine, outside
the scope of the visibleStaves declaration, so it has a pointer to
visibleStaves.
It seems to be working well so far, though it's more complex than I
would like. And using page->height() as the bottom of the last
visible staff is not a real solution, it's simply something that poses
no issues with for my specific SVG scores that use this code.
Otherwise, determining the bottom-most visible staff's height does not
seem straightforward. It would be nice to have a truly
general-purpose solution to the question: *What is the full height of
the bottom-most visible staff on a page?
*
Is there a straightforward way in the current master to answer that?
--
Sideways
On 4/22/2016 3:07 AM, Werner Schweer wrote:
_distanceUp and _distanceDown are gone and will
not come back. The staff distance is now
calculated in System->layout2()
and the system distance in Score->collectPage()
which calls layoutPage().
The distance between systems can be determined by
looking at system->pos().y().
SysStaff->_distanceUp/Down was used to collect
information from layouting elements like fret
symbols etc. which might increase
the staff distance. This is replaced by a more
generic algorithm which uses the Shape of staves
to determine the minimum distance without
any collision.
Am 21.04.2016 um 20:43 schrieb Sideways Skullfinger:
I submitted this question to the list 5 days ago,
and there has been no response, so I wanted to
try again. Is there a replacement for
SysStaff::distanceUp() and distanceDown() in the
latest master code?
Thanks,
Sideways
On 4/16/2016 12:29 PM, Sideways Skullfinger wrote:
2.0.3 source code here:
https://github.com/musescore/MuseScore/blob/2.0.3/libmscore/system.h#L48
The 2.0.3 class SysStaff looks like this:
class SysStaff {
QRectF _bbox; ///< Bbox of StaffLines.
qreal _yOff; ///< offset of top staff line
within bbox
qreal _distanceUp; ///< distance to previous staff
qreal _distanceDown; ///< distance to next staff
bool _show; ///< derived from Staff or false
if empty
...
The current master has removed these variables
and commented-out lines where the public
properties for these variables are called,
sometimes with a "TODO" in the comment.
I use SysStaff::distanceDown() and
SysStaff::distanceUp() in my code, and now I
have no substitute for it. What is the plan
here? How should I be determining the distance
between staves?
I posted this same thing on the musescore forums
here: https://musescore.org/en/node/106501
Thanks,
Sideways
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