1 files changed, 138 insertions, 0 deletions
diff --git a/src/commands/edit/RescaleCommand.cpp b/src/commands/edit/RescaleCommand.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 "RescaleCommand.h"
+
+#include "base/Event.h"
+#include "base/Segment.h"
+#include "base/Selection.h"
+#include "document/BasicCommand.h"
+#include <qstring.h>
+
+
+namespace Rosegarden
+{
+
+RescaleCommand::RescaleCommand(EventSelection &sel,
+                               timeT newDuration,
+                               bool closeGap) :
+        BasicCommand(getGlobalName(), sel.getSegment(),
+                     sel.getStartTime(),
+                     getAffectedEndTime(sel, newDuration, closeGap),
+                     true),
+        m_selection(&sel),
+        m_oldDuration(sel.getTotalDuration()),
+        m_newDuration(newDuration),
+        m_closeGap(closeGap)
+{
+    // nothing else
+}
+
+timeT
+RescaleCommand::getAffectedEndTime(EventSelection &sel,
+                                   timeT newDuration,
+                                   bool closeGap)
+{
+    timeT preScaleEnd = sel.getEndTime();
+    if (closeGap)
+        preScaleEnd = sel.getSegment().getEndMarkerTime();
+
+    // dupe of rescale(), but we can't use that here as the m_
+    // variables may not have been set
+    double d = preScaleEnd;
+    d *= newDuration;
+    d /= sel.getTotalDuration();
+    d += 0.5;
+    timeT postScaleEnd = (timeT)d;
+
+    return std::max(preScaleEnd, postScaleEnd);
+}
+
+timeT
+RescaleCommand::rescale(timeT t)
+{
+    // avoid overflows by using doubles
+    double d = t;
+    d *= m_newDuration;
+    d /= m_oldDuration;
+    d += 0.5;
+    return (timeT)d;
+}
+
+void
+RescaleCommand::modifySegment()
+{
+    if (m_oldDuration == m_newDuration)
+        return ;
+
+    timeT startTime = m_selection->getStartTime();
+    timeT diff = m_newDuration - m_oldDuration;
+    std::vector<Event *> toErase;
+    std::vector<Event *> toInsert;
+
+    Segment &segment = m_selection->getSegment();
+
+    for (EventSelection::eventcontainer::iterator i =
+                m_selection->getSegmentEvents().begin();
+            i != m_selection->getSegmentEvents().end(); ++i) {
+
+        toErase.push_back(*i);
+
+        timeT t = (*i)->getAbsoluteTime() - startTime;
+        timeT d = (*i)->getDuration();
+        t = rescale(t);
+        d = rescale(d);
+
+        toInsert.push_back(new Event(**i, startTime + t, d));
+    }
+
+    if (m_closeGap) {
+        for (Segment::iterator i = segment.findTime(startTime + m_oldDuration);
+                i != segment.end(); ++i) {
+            // move all events including any following the end marker
+            toErase.push_back(*i);
+            toInsert.push_back((*i)->copyMoving(diff));
+        }
+    }
+
+    for (std::vector<Event *>::iterator i = toErase.begin(); i != toErase.end(); ++i) {
+        m_selection->removeEvent(*i); // remove from selection
+        segment.eraseSingle(*i);
+    }
+
+    for (std::vector<Event *>::iterator i = toInsert.begin(); i != toInsert.end(); ++i) {
+        segment.insert(*i);
+        m_selection->addEvent(*i);  // add to selection
+    }
+
+    if (m_closeGap && diff > 0) {
+        segment.setEndMarkerTime(startTime +
+                                 rescale(segment.getEndMarkerTime() - startTime));
+    }
+
+    segment.normalizeRests(getStartTime(), getEndTime());
+}
+
+}