Problem with DataSeries object

[gomifromparis]

This problems happens when you add a custom dataseries in the code, not when you use the indicator provided dataseries.

In the following code, there are 2 Dataseries : Barnum, which is automatically added by the Add(new Plot...) method, and the dsOpen dataseries which is added manually by code.

Both dataseries are set as value(bar)=bar number, so when plotting they should show a straight line.

This is OK for the Barnum bar series (red), but the manual bar series repeats the last values.

        protected DataSeries dsOpen;
       
        protected override void Initialize()
        {
            Add(new Plot(Color.FromKnownColor(KnownColor.Orange), PlotStyle.Line, "Barnum"));
            CalculateOnBarClose    = true;
            Overlay                = false;
            
            if (Instrument != null)
            {
                dsOpen     = new DataSeries(this);
            }
        }

      protected override void OnBarUpdate()
        {
            dsOpen.Set(CurrentBar);
            Barnum.Set(CurrentBar);
        }
 
        public override void Plot(Graphics graphics, Rectangle bounds, double min, double max)
        {
            int lastBar        = Math.Min(ChartControl.LastBarPainted, Bars.Count - 1);
            int barsPainted = ChartControl.BarsPainted;
            int firstBar    = Math.Max(0, (lastBar - barsPainted) + 1);
            
            int x;
            for (int idx = firstBar; idx <= lastBar; idx++)
            {
                x=ChartControl.GetXByBarIdx(Bars,idx);
                graphics.DrawArc(new Pen(Color.Black,1),x,ChartControl.GetYByValue(this,dsOpen.Get(idx)),1,1,0,360);            
                graphics.DrawArc(new Pen(Color.Red,1),x,ChartControl.GetYByValue(this,Barnum.Get(idx)),1,1,0,360);            
                
            }
        }

[NinjaTrader_JoshP]

Data Series objects by default only store 256 values now. I suggest you do actual prints of the values to see what is happening under the hood. Unfortunately Plot override is not supported.

[gomifromparis]

The question was not about he plot, it was merely there to show you the problem in a graphical way.

Yes it looks like that the dataseries cycle on the last 256 values. Is this limitation going to disappear ?

[NinjaTrader_Dierk]

This is the new memory saving default behavior of custom data series. In case you wanted to have back the old "infinite lookback" logic please use this:

new DataSeries(this, MaximumBarsLookBack.Infinite)

[gomifromparis]

OK thanks.