1 files changed, 148 insertions, 0 deletions
diff --git a/src/commands/segment/SegmentRescaleCommand.cpp b/src/commands/segment/SegmentRescaleCommand.cpp
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+++ b/src/commands/segment/SegmentRescaleCommand.cpp
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+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio 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 rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+ 
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+ 
+    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 "SegmentRescaleCommand.h"
+
+#include "misc/Strings.h"
+#include "base/Event.h"
+#include "base/Composition.h"
+#include "base/NotationTypes.h"
+#include "base/Segment.h"
+#include <qstring.h>
+
+
+namespace Rosegarden
+{
+
+SegmentRescaleCommand::SegmentRescaleCommand(Segment *s,
+                                             int multiplier,
+                                             int divisor) :
+    KNamedCommand(getGlobalName()),
+    m_segment(s),
+    m_newSegment(0),
+    m_startTimeGiven(false),
+    m_startTime(s->getStartTime()),
+    m_multiplier(multiplier),
+    m_divisor(divisor),
+    m_detached(false)
+{
+    // nothing
+}
+
+SegmentRescaleCommand::SegmentRescaleCommand(Segment *s,
+                                             int multiplier,
+                                             int divisor,
+                                             timeT st) :
+    KNamedCommand(getGlobalName()),
+    m_segment(s),
+    m_newSegment(0),
+    m_startTimeGiven(true),
+    m_startTime(st),
+    m_multiplier(multiplier),
+    m_divisor(divisor),
+    m_detached(false)
+{
+    // nothing
+}
+
+SegmentRescaleCommand::~SegmentRescaleCommand()
+{
+    if (m_detached) {
+        delete m_segment;
+    } else {
+        delete m_newSegment;
+    }
+}
+
+timeT
+SegmentRescaleCommand::rescale(timeT t)
+{
+    // avoid overflows by using doubles
+    double d = t;
+    d *= m_multiplier;
+    d /= m_divisor;
+    d += 0.5;
+    return (timeT)d;
+}
+
+void
+SegmentRescaleCommand::execute()
+{
+    timeT startTime = m_segment->getStartTime();
+
+    if (m_startTimeGiven) startTime = m_startTime;
+
+    if (!m_newSegment) {
+
+        m_newSegment = new Segment();
+        m_newSegment->setTrack(m_segment->getTrack());
+        QString oldLabel = strtoqstr(m_segment->getLabel());
+        if (oldLabel.endsWith(i18n("(rescaled)"))) {
+            m_newSegment->setLabel(m_segment->getLabel());
+        } else {
+            m_newSegment->setLabel(qstrtostr(i18n("%1 (rescaled)").arg
+                                             (oldLabel)));
+        }
+        m_newSegment->setColourIndex(m_segment->getColourIndex());
+
+        for (Segment::iterator i = m_segment->begin();
+                m_segment->isBeforeEndMarker(i); ++i) {
+
+            if ((*i)->isa(Note::EventRestType))
+                continue;
+
+            timeT dt = (*i)->getAbsoluteTime() - startTime;
+            timeT duration = (*i)->getDuration();
+
+            //!!! use doubles for this calculation where necessary
+
+            m_newSegment->insert
+            (new Event(**i,
+                       startTime + rescale(dt),
+                       rescale(duration)));
+        }
+    }
+
+    m_segment->getComposition()->addSegment(m_newSegment);
+    m_segment->getComposition()->detachSegment(m_segment);
+    m_newSegment->normalizeRests(m_newSegment->getStartTime(),
+                                 m_newSegment->getEndTime());
+
+    m_newSegment->setEndMarkerTime
+    (startTime + rescale(m_segment->getEndMarkerTime() - 
+                         m_segment->getStartTime()));
+
+    m_detached = true;
+}
+
+void
+SegmentRescaleCommand::unexecute()
+{
+    m_newSegment->getComposition()->addSegment(m_segment);
+    m_newSegment->getComposition()->detachSegment(m_newSegment);
+    m_detached = false;
+}
+
+}