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// -*- c-basic-offset: 4 -*-
/*
Rosegarden
A sequencer and musical notation editor.
This program is Copyright 2000-2008
Guillaume Laurent <[email protected]>,
Chris Cannam <[email protected]>,
Richard Bown <[email protected]>
The moral right of the authors to claim authorship of this work
has been asserted.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#include "SnapGrid.h"
#include "Composition.h"
namespace Rosegarden {
//////////////////////////////////////////////////////////////////////
// SnapGrid
//////////////////////////////////////////////////////////////////////
const timeT SnapGrid::NoSnap = -1;
const timeT SnapGrid::SnapToBar = -2;
const timeT SnapGrid::SnapToBeat = -3;
const timeT SnapGrid::SnapToUnit = -4;
SnapGrid::SnapGrid(RulerScale *rulerScale, int ysnap) :
m_rulerScale(rulerScale),
m_snapTime(SnapToBeat),
m_ysnap(ysnap)
{
// nothing else
}
void
SnapGrid::setSnapTime(timeT snap)
{
assert(snap > 0 ||
snap == NoSnap ||
snap == SnapToBar ||
snap == SnapToBeat ||
snap == SnapToUnit);
m_snapTime = snap;
}
timeT
SnapGrid::getSnapSetting() const
{
return m_snapTime;
}
timeT
SnapGrid::getSnapTime(double x) const
{
timeT time = m_rulerScale->getTimeForX(x);
return getSnapTime(time);
}
timeT
SnapGrid::getSnapTime(timeT time) const
{
if (m_snapTime == NoSnap) return 0;
Rosegarden::Composition *composition = m_rulerScale->getComposition();
int barNo = composition->getBarNumber(time);
std::pair<timeT, timeT> barRange = composition->getBarRange(barNo);
timeT snapTime = barRange.second - barRange.first;
if (m_snapTime == SnapToBeat) {
snapTime = composition->getTimeSignatureAt(time).getBeatDuration();
} else if (m_snapTime == SnapToUnit) {
snapTime = composition->getTimeSignatureAt(time).getUnitDuration();
} else if (m_snapTime != SnapToBar && m_snapTime < snapTime) {
snapTime = m_snapTime;
}
return snapTime;
}
timeT
SnapGrid::snapX(double x, SnapDirection direction) const
{
return snapTime(m_rulerScale->getTimeForX(x), direction);
}
timeT
SnapGrid::snapTime(timeT time, SnapDirection direction) const
{
if (m_snapTime == NoSnap) return time;
Rosegarden::Composition *composition = m_rulerScale->getComposition();
int barNo = composition->getBarNumber(time);
std::pair<timeT, timeT> barRange = composition->getBarRange(barNo);
timeT snapTime = barRange.second - barRange.first;
if (m_snapTime == SnapToBeat) {
snapTime = composition->getTimeSignatureAt(time).getBeatDuration();
} else if (m_snapTime == SnapToUnit) {
snapTime = composition->getTimeSignatureAt(time).getUnitDuration();
} else if (m_snapTime != SnapToBar && m_snapTime < snapTime) {
snapTime = m_snapTime;
}
timeT offset = (time - barRange.first);
timeT rounded = (offset / snapTime) * snapTime;
timeT left = rounded + barRange.first;
timeT right = left + snapTime;
if (direction == SnapLeft) return left;
else if (direction == SnapRight) return right;
else if ((offset - rounded) > (rounded + snapTime - offset)) return right;
else return left;
}
int
SnapGrid::getYBin(int y) const
{
if (m_ysnap == 0) return y;
int cy = 0;
std::map<int, int>::const_iterator i = m_ymultiple.begin();
int nextbin = -1;
if (i != m_ymultiple.end()) nextbin = i->first;
for (int b = 0; ; ++b) {
if (nextbin == b) {
cy += i->second * m_ysnap;
++i;
if (i == m_ymultiple.end()) nextbin = -1;
else nextbin = i->first;
} else {
cy += m_ysnap;
}
if (cy > y) {
return b;
}
}
}
int
SnapGrid::getYBinCoordinate(int bin) const
{
if (m_ysnap == 0) return bin;
int y = 0;
std::map<int, int>::const_iterator i = m_ymultiple.begin();
int nextbin = -1;
if (i != m_ymultiple.end()) nextbin = i->first;
for (int b = 0; b < bin; ++b) {
if (nextbin == b) {
y += i->second * m_ysnap;
++i;
if (i == m_ymultiple.end()) nextbin = -1;
else nextbin = i->first;
} else {
y += m_ysnap;
}
}
return y;
}
}
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