VocalEasel/Sources/VLLayout.cpp

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2007-12-23 12:45:17 +00:00
//
// File: VLLayout.cpp - Dimensions for lead sheet layout
//
// Author(s):
//
// (MN) Matthias Neeracher
//
// Copyright © 2007 Matthias Neeracher
//
#include "VLLayout.h"
#include "VLSheetViewInternal.h"
#include <algorithm>
#include <cstdlib>
#include <cmath>
VLSystemLayout::VLSystemLayout(const VLProperties & prop, float width)
{
fDivisions = prop.fDivisions;
fNumGroups = prop.fTime.fNum / std::max(prop.fTime.fDenom / 4, 1);
fDivPerGroup = fDivisions * prop.fTime.fNum * 4 / (prop.fTime.fDenom * fNumGroups);
fClefKeyWidth = kClefX+kClefW+(std::labs(prop.fKey)+1)*kKeyW;
fMeasureWidth = fNumGroups*(fDivPerGroup+1)*kNoteW;
fNumMeasures= std::max<int>(1, std::floor((width-fClefKeyWidth) / fMeasureWidth));
}
VLLayout::VLLayout(const VLSong & song, float width)
{
for (size_t meas = 0; meas<song.fMeasures.size(); ) {
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push_back(VLSystemLayout(song.Properties(meas), width));
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meas += back().NumMeasures();
}
}
int VLLayout::FirstMeasure(int system) const
{
int meas = 0;
for (int sys=0; sys<system; ++sys)
meas += (*this)[sys].NumMeasures();
return meas;
}
int VLLayout::SystemForMeasure(int measure) const
{
int sys;
for (sys=0; sys<size(); ++sys) {
measure -= (*this)[sys].NumMeasures();
if (measure < 0)
break;
}
return sys;
}
float VLLayout::MeasurePosition(int measure) const
{
for (int sys=0; sys<size(); ++sys) {
const VLSystemLayout & layout = (*this)[sys];
if (measure < layout.NumMeasures())
return layout.MeasurePosition(measure);
measure -= layout.NumMeasures();
}
return 0.0f;
}
float VLLayout::NotePosition(int measure, VLFraction at) const
{
for (int sys=0; sys<size(); ++sys) {
const VLSystemLayout & layout = (*this)[sys];
if (measure < layout.NumMeasures()) {
int div = at.fNum*4*layout.Divisions() / at.fDenom;
return layout.MeasurePosition(measure)
+ (div + div/layout.DivPerGroup() + 1)*kNoteW;
}
measure -= layout.NumMeasures();
}
return 0.0f;
}