private void CustomVisualizer_Draw(IVisualizer sender, VisualizerDrawEventArgs args)
{
if (!MainPageViewModel.Current.IsVisualizing)
{
return;
}
var drawingSession = (CanvasDrawingSession)args.DrawingSession;
float barWidth = canvasWidth / (2 * Consts.SpectrumBarCount);
// Calculate spectum metrics
var barSize = new Vector2(barWidth, canvasHeight - 2 * barWidth);
// Get the data if data exists and source is in play state, else use empty
var spectrumData = args.Data != null && Visualizer.Source?.PlaybackState == SourcePlaybackState.Playing ?
args.Data.Spectrum.LogarithmicTransform(Consts.SpectrumBarCount, 20f, 20000f) : _emptySpectrum;
_previousSpectrum = spectrumData.ApplyRiseAndFall(_previousSpectrum, _rmsRiseTime, _rmsFallTime, _frameDuration);
_previousPeakSpectrum = spectrumData.ApplyRiseAndFall(_previousPeakSpectrum, _peakRiseTime, _peakFallTime, _frameDuration);
var logSpectrum = _previousSpectrum.ConvertToDecibels(-50, 0);
var logPeakSpectrum = _previousPeakSpectrum.ConvertToDecibels(-50, 0);
var step = canvasWidth / Consts.SpectrumBarCount;
var flaw = (step - barSize.X) / 2;
using (var brush = new CanvasLinearGradientBrush(drawingSession, new CanvasGradientStop[] { new CanvasGradientStop()
{
Color = Context.CurrentColor[0], Position = 0f
}, new CanvasGradientStop()
{
Color = Context.CurrentColor[1], Position = 1f
} })
{
StartPoint = new Vector2(canvasWidth, 0),
EndPoint = new Vector2(0, canvasHeight)
})
{
// Draw spectrum bars
for (int index = 0; index < Consts.SpectrumBarCount; index++)
{
float barX = step * index + flaw;
// use average of 2 channel
float spectrumBarHeight = barSize.Y * (1.0f - (logSpectrum[0][index] + logSpectrum[1][index]) / -100.0f);
drawingSession.FillRoundedRectangle(barX, canvasHeight - barWidth - spectrumBarHeight, barSize.X, spectrumBarHeight, barSize.X / 2, barSize.X / 2, brush);
}
}
// Spectrum points to draw a slow decay line
for (int index = 0; index < Consts.SpectrumBarCount; index++)
{
float X = (index + 0.5f) * step;
float spectrumBarHeight = barSize.Y * (1.0f - (logPeakSpectrum[0][index] + logPeakSpectrum[1][index]) / -100.0f);
var decayPoint = new Vector2(X, canvasHeight - barWidth - spectrumBarHeight);
drawingSession.FillCircle(decayPoint, barSize.X / 2, Context.CurrentColor[0]);
}
}
private void PositionDisplay_Draw(IVisualizer sender, VisualizerDrawEventArgs args)
{
if (args.PresentationTime != null)
{
string timeString = args.PresentationTime.Value.ToString("mm\\:ss\\.ff");
var ds = (CanvasDrawingSession)args.DrawingSession;
ds.DrawText(timeString, 0, 0, Colors.Gray);
}
}
private void CustomVisualizer_Draw(IVisualizer sender, VisualizerDrawEventArgs args)
{
if (!MainPageViewModel.Current.IsVisualizing || Context.Palette == null)
{
return;
}
lock (drawingLock)
{
var drawingSession = (CanvasDrawingSession)args.DrawingSession;
float barWidth = canvasWidth / barCount;
// Calculate spectum metrics
var barSize = new Vector2(barWidth, canvasHeight - 2 * barWidth);
// Get the data if data exists and source is in play state, else use empty
var spectrumData = args.Data != null && Visualizer.Source?.PlaybackState == SourcePlaybackState.Playing ?
args.Data.Spectrum.LogarithmicTransform(barCount, 20f, 20000f) : _emptySpectrum;
_previousSpectrum = spectrumData.ApplyRiseAndFall(_previousSpectrum, _rmsRiseTime, _rmsFallTime, _frameDuration);
_previousPeakSpectrum = spectrumData.ApplyRiseAndFall(_previousPeakSpectrum, _peakRiseTime, _peakFallTime, _frameDuration);
var logSpectrum = _previousSpectrum.ConvertToDecibels(-50, 0);
var logPeakSpectrum = _previousPeakSpectrum.ConvertToDecibels(-50, 0);
var step = canvasWidth / barCount;
var flaw = (step - barSize.X) / 2;
// Draw spectrum bars
for (int index = 0, j = 0; index < barCount; index++, j++)
{
float barX = step * index + flaw;
// use average of 2 channel and add a offset to pretty
float spectrumBarHeight = barSize.Y * (1.0f - (logSpectrum[0][index] + logSpectrum[1][index]) / -100.0f) + barSize.X;
if (j >= Context.Palette.Count)
{
j = 0;
}
drawingSession.FillRoundedRectangle(barX, 0, barSize.X, spectrumBarHeight, barSize.X / 2, barSize.X / 2, Context.Palette[j]);
drawingSession.FillRectangle(barX, 0, barSize.X, spectrumBarHeight - barSize.X / 2, Context.Palette[j]);
}
}
}
private void Visualizer_Draw(object sender, VisualizerDrawEventArgs args)
{
}
