private LineSeries CreateLineSeriesAndAxis(SymbolObservationViewModel symbol)
{
var lineSeries = new LineSeries();
lineSeries.Title = symbol.Name;
var index = PlotModel.Axes.Count - 1;
var axis = new LinearAxis
{
AxislineThickness = 2,
AxislineColor = PlotModel.DefaultColors[index],
MinorTickSize = 4,
MajorTickSize = 7,
TicklineColor = PlotModel.DefaultColors[index],
TextColor = PlotModel.DefaultColors[index],
AxisDistance = PlotModel.Axes.OfType <LinearAxis>().Count() * 50,
Position = AxisPosition.Left,
IsZoomEnabled = false,
Key = symbol.Name,
Tag = symbol.Name,
MinimumPadding = 0.1,
MaximumPadding = 0.1
};
lineSeries.YAxisKey = symbol.Name;
PlotModel.Axes.Add(axis);
PlotModel.Series.Add(lineSeries);
return(lineSeries);
}
private IDisposable CreateSymbolLineSeries(SymbolObservationViewModel symbol)
{
var lineSeries = CreateLineSeriesAndAxis(symbol);
var disposable = new CompositeDisposable();
RescaleAxisDistances();
dataPoints[symbol.Name] = new List <DataPoint> {
DateTimeAxis.CreateDataPoint(DateTime.Now, Convert.ToDouble(symbol.Value))
};
Observable.FromEventPattern <PropertyChangedEventHandler, PropertyChangedEventArgs>(
handler => handler.Invoke,
h => symbol.PropertyChanged += h,
h => symbol.PropertyChanged -= h)
.Where(args => args.EventArgs.PropertyName == "Value" && pause == false)
.ObserveOnDispatcher()
.Subscribe(x => { UpdateDatapoints(symbol); }).AddDisposableTo(disposable);
Observable.Interval(TimeSpan.FromSeconds(1))
.Where(x => pause == false)
.ObserveOnDispatcher()
.Subscribe(x => { UpdateLineseries(symbol, lineSeries); })
.AddDisposableTo(disposable);
raisePropertyChanged("PlotModel");
// Need to invalidate oxyplot graph after removal of line series in order to have it really removed from UI
Disposable.Create(() => PlotModel.InvalidatePlot(true))
.AddDisposableTo(disposable);
return(disposable);
}
public void AddSymbol(SymbolObservationViewModel symbol)
{
var symbolInLineSeries = PlotModel.Series.FirstOrDefault(series => series.Title == symbol.Name);
if (symbolInLineSeries == null)
{
symbolCache.AddOrUpdate(symbol);
}
}
private void UpdateDatapoints(SymbolObservationViewModel symbol)
{
var refreshTime = DateTime.Now;
dataPoints[symbol.Name].Add(DateTimeAxis.CreateDataPoint(refreshTime, Convert.ToDouble(symbol.Value)));
var expireLimit = DateTimeAxis.ToDouble(DateTime.Now.Subtract(ExpiresAfter));
dataPoints[symbol.Name].RemoveAll(point => point.X < expireLimit);
}
private void UpdateLineseries(SymbolObservationViewModel symbol, LineSeries lineSeries)
{
var newPoints = dataPoints[symbol.Name]
.Where(point => !lineSeries.Points.Select(oldPoint => oldPoint.X).Contains(point.X));
if (!newPoints.Any() && dataPoints[symbol.Name].Any())
{
var lastPoint = dataPoints[symbol.Name].LastOrDefault();
newPoints = new[] { DateTimeAxis.CreateDataPoint(DateTime.Now, lastPoint.Y) };
}
lineSeries.Points.AddRange(newPoints);
var expireLimit = DateTimeAxis.ToDouble(DateTime.Now.Subtract(ExpiresAfter));
lineSeries.Points.RemoveAll(point => point.X < expireLimit);
PlotModel.InvalidatePlot(true);
raisePropertyChanged("PlotModel");
}
public void RemoveSymbol(SymbolObservationViewModel symbol)
{
symbolCache.Remove(symbol.Name);
var seriesToRemove = PlotModel.Series.FirstOrDefault(series => series.Title == symbol.Name);
if (seriesToRemove != null)
{
PlotModel.Series.Remove(seriesToRemove);
}
var axisToRemove = PlotModel.Axes.FirstOrDefault(axis => axis.Key == symbol.Name);
if (axisToRemove != null)
{
PlotModel.Axes.Remove(axisToRemove);
}
RescaleAxisDistances();
}
