anonymous_namespace{SampleHandle.cpp} Namespace Reference

Functions
double	adjustTime (const WaveTrack *wt, double time)
bool	SampleResolutionTest (const ViewInfo &viewInfo, const WaveTrack *wt, double time, int width)
bool	IsSampleEditingPossible (const wxMouseEvent &event, const wxRect &rect, const ViewInfo &viewInfo, WaveTrack *wt, int width)

Function Documentation

adjustTime()

double anonymous_namespace{SampleHandle.cpp}::adjustTime ( const WaveTrack *  wt, double  time  )

inline

Definition at line 83 of file SampleHandle.cpp.

   {
      // Round to an exact sample time
      return wt->LongSamplesToTime(wt->TimeToLongSamples(time));
   }

References SampleTrack::LongSamplesToTime(), and SampleTrack::TimeToLongSamples().

Referenced by SampleHandle::Click(), SampleHandle::HitTest(), and IsSampleEditingPossible().

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IsSampleEditingPossible()

bool anonymous_namespace{SampleHandle.cpp}::IsSampleEditingPossible	(	const wxMouseEvent &	event,
		const wxRect &	rect,
		const ViewInfo &	viewInfo,
		WaveTrack *	wt,
		int	width
	)

Determines if we can edit samples in a wave track. Also pops up warning messages in certain cases where we can't.

Returns

true if we can edit the samples, false otherwise.

Definition at line 172 of file SampleHandle.cpp.

   {
      //If we aren't zoomed in far enough, show a message dialog.
      const double time = adjustTime(wt, viewInfo.PositionToTime(event.m_x, rect.x));
      if (!SampleResolutionTest(viewInfo, wt, time, width))
      {
         AudacityMessageBox(
            XO(
"To use Draw, zoom in further until you can see the individual samples."),
            XO("Draw Tool"));
         return false;
      }
      return true;
   }

References adjustTime(), AudacityMessageBox(), ZoomInfo::PositionToTime(), SampleResolutionTest(), and XO.

Referenced by SampleHandle::Click().

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SampleResolutionTest()

bool anonymous_namespace{SampleHandle.cpp}::SampleResolutionTest	(	const ViewInfo &	viewInfo,
		const WaveTrack *	wt,
		double	time,
		int	width
	)

Definition at line 91 of file SampleHandle.cpp.

   {
      // Require more than 3 pixels per sample
      const wxInt64 xx = std::max(wxInt64(0), viewInfo.TimeToPosition(time));
      ZoomInfo::Intervals intervals;
      const double rate = wt->GetRate();
      viewInfo.FindIntervals(rate, intervals, width);
      ZoomInfo::Intervals::const_iterator it = intervals.begin(),
         end = intervals.end(), prev;
      wxASSERT(it != end && it->position == 0);
      do
         prev = it++;
      while (it != end && it->position <= xx);
      const double threshold = 3 * rate;
      // three times as many pixels per second, as samples
      return prev->averageZoom > threshold;
   }

References PackedArray::end(), ZoomInfo::FindIntervals(), WaveTrack::GetRate(), and ZoomInfo::TimeToPosition().

Referenced by SampleHandle::HitTest(), and IsSampleEditingPossible().

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