private void UpdateBarLayout()
{
if (_soundPlayer == null || _spectrumCanvas == null)
{
return;
}
_barWidth = Math.Max(((_spectrumCanvas.RenderSize.Width - (BarSpacing * (BarCount + 1))) / BarCount), 1);
_maximumFrequencyIndex = Math.Min(_soundPlayer.GetFftFrequencyIndex(MaximumFrequency) + 1, 2047);
_minimumFrequencyIndex = Math.Min(_soundPlayer.GetFftFrequencyIndex(MinimumFrequency), 2047);
int actualBarCount;
actualBarCount = _barWidth >= 1.0d
? BarCount
: Math.Max((int)((_spectrumCanvas.RenderSize.Width - BarSpacing) / (_barWidth + BarSpacing)), 1);
_channelPeakData = new float[actualBarCount];
var indexCount = _maximumFrequencyIndex - _minimumFrequencyIndex;
var linearIndexBucketSize = (int)Math.Round(indexCount / (double)actualBarCount, 0);
var maxIndexList = new List <int>();
var maxLogScaleIndexList = new List <int>();
var maxLog = Math.Log(actualBarCount, actualBarCount);
for (var i = 1; i < actualBarCount; i++)
{
maxIndexList.Add(_minimumFrequencyIndex + (i * linearIndexBucketSize));
var logIndex = (int)((maxLog - Math.Log((actualBarCount + 1) - i, (actualBarCount + 1))) * indexCount) + _minimumFrequencyIndex;
maxLogScaleIndexList.Add(logIndex);
}
maxIndexList.Add(_maximumFrequencyIndex);
maxLogScaleIndexList.Add(_maximumFrequencyIndex);
_barIndexMax = maxIndexList.ToArray();
_barLogScaleIndexMax = maxLogScaleIndexList.ToArray();
_spectrumCanvas.Children.Clear();
_barShapes.Clear();
_peakShapes.Clear();
var height = _spectrumCanvas.RenderSize.Height;
var peakDotHeight = Math.Max(_barWidth / 2.0f, 1);
for (var i = 0; i < actualBarCount; i++)
{
var xCoord = BarSpacing + (_barWidth * i) + (BarSpacing * i) + 1;
var barRectangle = new Rectangle()
{
Margin = new Thickness(xCoord, height, 0, 0),
Width = _barWidth,
Height = 0,
Style = BarStyle
};
_barShapes.Add(barRectangle);
var peakRectangle = new Rectangle()
{
Margin = new Thickness(xCoord, height - peakDotHeight, 0, 0),
Width = _barWidth,
Height = peakDotHeight,
Style = PeakStyle
};
_peakShapes.Add(peakRectangle);
}
foreach (var shape in _barShapes)
{
_spectrumCanvas.Children.Add(shape);
}
foreach (var shape in _peakShapes)
{
_spectrumCanvas.Children.Add(shape);
}
ActualBarWidth = _barWidth;
}
