protected override SizeF CalculateInnerDesiredSize(SizeF totalSize)
{
FrameworkElementCollection children = Children;
lock (Children.SyncRoot)
{
if (_newItemProvider != null)
{
if (children.Count > 0)
{
children.Clear(false);
}
if (_itemProvider != null)
{
MPF.TryCleanupAndDispose(_itemProvider);
}
_itemProvider = _newItemProvider;
_newItemProvider = null;
_updateRenderOrder = true;
}
_assumedLineExtendsInNonOrientationDirection = 0;
IItemProvider itemProvider = ItemProvider;
if (itemProvider == null)
{
return(base.CalculateInnerDesiredSize(totalSize));
}
int numItems = itemProvider.NumItems;
if (numItems == 0)
{
return(new SizeF());
}
// CalculateInnerDesiredSize is called before ArrangeChildren!
// under the precondition that all items use the same template and are equally sized
// calulate just one line to find number of items and required size of a line
LineMeasurement exemplaryLine = _firstArrangedLineIndex < 0 ? CalculateLine(0, totalSize, false) : _arrangedLines[_firstArrangedLineIndex];
_assumedLineExtendsInNonOrientationDirection = exemplaryLine.TotalExtendsInNonOrientationDirection;
var itemsPerLine = exemplaryLine.EndIndex - exemplaryLine.StartIndex + 1;
var estimatedExtendsInNonOrientationDirection = (float)Math.Ceiling((float)numItems / itemsPerLine) * _assumedLineExtendsInNonOrientationDirection;
return(Orientation == Orientation.Horizontal ? new SizeF(exemplaryLine.TotalExtendsInOrientationDirection, estimatedExtendsInNonOrientationDirection) :
new SizeF(estimatedExtendsInNonOrientationDirection, exemplaryLine.TotalExtendsInOrientationDirection));
}
}
private void InitializeBars()
{
IAudioPlayerAnalyze player = ActiveSpectrumPlayer;
if (player == null)
{
_barWidth = 1;
_maximumFrequencyIndex = -1;
_minimumFrequencyIndex = 0;
return;
}
if (!_refreshShapes || _spectrumCanvas == null)
{
return;
}
int maxIndex;
int minIndex;
bool res = player.GetFFTFrequencyIndex(MaximumFrequency, out maxIndex);
res |= player.GetFFTFrequencyIndex(MinimumFrequency, out minIndex);
if (!res)
{
return;
}
_maximumFrequencyIndex = Math.Min(maxIndex + 1, FREQUENCY_BUFFER_SIZE - 1);
_minimumFrequencyIndex = Math.Min(minIndex, FREQUENCY_BUFFER_SIZE - 1);
_barWidth = Math.Max(((_spectrumCanvas.ActualWidth - (BarSpacing * (BarCount + 1))) / BarCount), 1);
int actualBarCount = _barWidth >= 1.0d ? BarCount : Math.Max((int)((_spectrumCanvas.ActualWidth - BarSpacing) / (_barWidth + BarSpacing)), 1);
_channelPeakData = new float[actualBarCount];
int indexCount = _maximumFrequencyIndex - _minimumFrequencyIndex;
int linearIndexBucketSize = (int)Math.Round(indexCount / (double)actualBarCount, 0);
List <int> maxIndexList = new List <int>();
List <int> maxLogScaleIndexList = new List <int>();
double maxLog = Math.Log(actualBarCount, actualBarCount);
for (int i = 1; i < actualBarCount; i++)
{
maxIndexList.Add(_minimumFrequencyIndex + (i * linearIndexBucketSize));
int 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();
FrameworkElementCollection canvasChildren = _spectrumCanvas.Children;
canvasChildren.StartUpdate();
try
{
canvasChildren.Clear();
double height = _spectrumCanvas.ActualHeight;
double peakDotHeight = Math.Max(_barWidth / 2.0f, 1);
for (int i = 0; i < actualBarCount; i++)
{
// Deep copy the styles to each bar
Style barStyleCopy = MpfCopyManager.DeepCopyCutLVPs(BarStyle);
Style peakStyleCopy = MpfCopyManager.DeepCopyCutLVPs(PeakStyle);
double xCoord = BarSpacing + (_barWidth * i) + (BarSpacing * i) + 1;
Control barControl = new Control
{
Width = _barWidth,
Height = height,
Style = barStyleCopy
};
Canvas.SetLeft(barControl, xCoord);
Canvas.SetBottom(barControl, height);
_barShapes.Add(barControl);
canvasChildren.Add(barControl);
Control peakControl = new Control
{
Width = _barWidth,
Height = peakDotHeight,
Style = peakStyleCopy
};
Canvas.SetLeft(peakControl, xCoord);
Canvas.SetBottom(peakControl, height);
_peakShapes.Add(peakControl);
canvasChildren.Add(peakControl);
}
}
finally
{
canvasChildren.EndUpdate();
}
ActualBarWidth = _barWidth;
_refreshShapes = false;
}