public readonly int SDataCount; // number of data points in chart / series
/// <summary>
/// ViewModel constructor, requires data source and number of data point in series / chart
/// </summary>
/// <param name="volume">data source</param>
/// <param name="nseries">number of data points</param>
public ViewModelVolumeChart(DataTSVolume volume, int nseries)
{
// init properties
DSVolume = volume;
SDataCount = nseries;
VBid = new ObservableCollection <DataPoint>();
VAsk = new ObservableCollection <DataPoint>();
VTraded = new ObservableCollection <DataPoint>();
// pre-allocate data points
for (int i0 = 0; i0 < SDataCount; ++i0)
{
SetCollectionDataPoint(VBid, -1, i0 + 1, 0);
SetCollectionDataPoint(VAsk, -1, i0 + 1, 0);
SetCollectionDataPoint(VTraded, -1, i0 + 1, double.NaN);
SetCollectionDataPoint(VTraded, -1, i0 + 1, double.NaN);
SetCollectionDataPoint(VTraded, -1, i0 + 1, double.NaN);
}
}
/// <summary>
/// Update data source and all data point
/// </summary>
/// <param name="volume">new data source</param>
public void ChangeDataSource(DataTSVolume volume)
{
DSVolume = volume; // set to new data source
NewData(true); // update all data points, will cause GUI to redraw
}
