/// <summary>
/// Gets the <see cref="VolumeCache"/> for the specified <see cref="IImageViewer"/> instance.
/// </summary>
public static VolumeCache GetVolumeCache(this IImageViewer imageViewer)
{
Platform.CheckForNullReference(imageViewer, "imageViewer");
var instance = imageViewer.ExtensionData[typeof (VolumeCache)] as VolumeCache;
if (instance == null)
imageViewer.ExtensionData[typeof (VolumeCache)] = instance = new VolumeCache();
return instance;
}
//Subtracts the current daily volume from the previous daily volume to return volume
//for the current tick price. Only required for data APIs that do not supply tick volume.
private double GetTickVolume(string Symbol, long CurrentDailyVolume)
{
for (int n = 0; n < m_VolumeCache.Count - 1; n++)
{
if (m_VolumeCache[n].Symbol == Symbol)
{
if (m_VolumeCache[n].LastDailyVolume > 0 && CurrentDailyVolume > 0)
{
m_VolumeCache[n].LastTickVolume = CurrentDailyVolume - m_VolumeCache[n].LastDailyVolume;
}
m_VolumeCache[n].LastDailyVolume = CurrentDailyVolume;
return(m_VolumeCache[n].LastTickVolume);
}
}
//Symbol wasn't found meaning no volume has been cached yet for this symbol
VolumeCache vc = new VolumeCache {
Symbol = Symbol
};
m_VolumeCache.Add(vc);
return(0);
}
