CommonChannelView.cpp

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/**********************************************************************
 
Audacity: A Digital Audio Editor
 
CommonChannelView.cpp
 
Paul Licameli split from class TrackView (now called ChannelView)
 
**********************************************************************/
 
#include "CommonChannelView.h"
 
#include "BackgroundCell.h"
#include "CommonTrackInfo.h"
#include "TimeShiftHandle.h"
#include "TrackControls.h"
#include "ZoomHandle.h"
#include "../ui/SelectHandle.h"
#include "AColor.h"
#include "PendingTracks.h"
#include "../../ProjectSettings.h"
#include "Track.h"
#include "../../TrackArtist.h"
#include "../../TrackPanelDrawingContext.h"
#include "../../TrackPanelMouseEvent.h"
 
#include <wx/dc.h>
#include <wx/graphics.h>
 
std::vector<UIHandlePtr> CommonChannelView::HitTest
(const TrackPanelMouseState &st,
 const AudacityProject *pProject)
{
   UIHandlePtr result;
   using namespace ToolCodes;
   std::vector<UIHandlePtr> results;
   const auto &settings = ProjectSettings::Get( *pProject );
   const auto currentTool = settings.GetTool();
   const bool isMultiTool = ( currentTool == multiTool );
 
   // In other tools, let subclasses determine detailed hits.
   results =
      DetailedHitTest( st, pProject, currentTool, isMultiTool );
 
   // There are still some general cases.
 
   #if 0
   // Sliding applies in more than one track type.
   if ( !isMultiTool && currentTool == slideTool ) {
      result = TimeShiftHandle::HitAnywhere(
         mTimeShiftHandle, FindTrack(), false);
      if (result)
         results.push_back(result);
   }
   #endif
 
   // Let the multi-tool right-click handler apply only in default of all
   // other detailed hits.
   if ( isMultiTool ) {
      result = ZoomHandle::HitTest(
         BackgroundCell::Get( *pProject ).mZoomHandle, st.state);
      if (result)
         results.push_back(result);
   }
 
   // Finally, default of all is adjustment of the selection box.
   if ( isMultiTool || currentTool == selectTool ) {
      result = SelectHandle::HitTest(
         mSelectHandle, st, pProject, shared_from_this() );
      if (result)
         results.push_back(result);
   }
 
   return results;
}
 
std::shared_ptr<TrackPanelCell> CommonChannelView::ContextMenuDelegate()
{
   const auto pTrack = FindTrack();
   if (pTrack)
      return TrackControls::Get(*pTrack).shared_from_this();
   return nullptr;
}
 
int CommonChannelView::GetMinimizedHeight() const
{
   const auto height = CommonTrackInfo::MinimumTrackHeight();
   auto pChannel = FindChannel().get();
   if (!pChannel)
      return height;
   const auto pTrack =
      dynamic_cast<const Track *>(&pChannel->GetChannelGroup());
   if (!pTrack)
      return 0;
   if (const auto pList = pTrack->GetOwner())
      if (const auto p = pList->GetOwner())
          pChannel =
            &PendingTracks::Get(*p).SubstituteOriginalChannel(*pChannel);
 
   // Find index of the channel in its group and use that to round off correctly
   const auto index = pChannel->GetChannelIndex();
   const auto nChannels = pChannel->GetChannelGroup().Channels().size();
   return (height * (index + 1) / nChannels) - (height * index / nChannels);
}
 
#include "Envelope.h"
#include "ZoomInfo.h"
void CommonChannelView::GetEnvelopeValues( const Envelope &env,
   double alignedTime, double sampleDur,
   double *buffer, int bufferLen, int leftOffset,
   const ZoomInfo &zoomInfo )
{
   // Getting many envelope values, corresponding to pixel columns, which may
   // not be uniformly spaced in time when there is a fisheye.
 
   double prevDiscreteTime=0.0, prevSampleVal=0.0, nextSampleVal=0.0;
   for ( int xx = 0; xx < bufferLen; ++xx ) {
      auto time = zoomInfo.PositionToTime( xx, -leftOffset );
      if ( sampleDur <= 0 )
         // Sample interval not defined (as for time track)
         buffer[xx] = env.GetValue( time );
      else {
         // The level of zoom-in may resolve individual samples.
         // If so, then instead of evaluating the envelope directly,
         // we draw a piecewise curve with knees at each sample time.
         // This actually makes clearer what happens as you drag envelope
         // points and make discontinuities.
         auto leftDiscreteTime = alignedTime +
            sampleDur * floor( ( time - alignedTime ) / sampleDur );
         if ( xx == 0 || leftDiscreteTime != prevDiscreteTime ) {
            prevDiscreteTime = leftDiscreteTime;
            prevSampleVal =
               env.GetValue( prevDiscreteTime, sampleDur );
            nextSampleVal =
               env.GetValue( prevDiscreteTime + sampleDur, sampleDur );
         }
         auto ratio = ( time - leftDiscreteTime ) / sampleDur;
         if ( env.GetExponential() )
            buffer[ xx ] = exp(
               ( 1.0 - ratio ) * log( prevSampleVal )
                  + ratio * log( nextSampleVal ) );
         else
            buffer[ xx ] =
               ( 1.0 - ratio ) * prevSampleVal + ratio * nextSampleVal;
      }
   }
}