Help with multiseries drawing in OnRender

[palinuro]

Hi,

I'm having trouble correctly drawing on he price panel from values derived from a secondary one-minute series, and wondered if someone could tell me what I'm doing wrong. The code works as expected until I connect to a live data source, and then it displays results that seem to have no relation to the secondary series or the primary series.

I'm attaching images of the chart, disconnected and connected.

And here's the code (simplified):

		protected override void OnRender(ChartControl chartControl, ChartScale chartScale)
		{
			try
			{
				
				if(Bars == null || Bars.Instrument == null || IsInHitTest)
					return;
				
				int		firstBarPainted 	= ChartBars.FromIndex;
				int		lastBarPainted		= ChartBars.ToIndex;
				SharpDX.Direct2D1.Brush LineBrushDx		= LineBrush.ToDxBrush(RenderTarget);
				
				int baridx;
				for (baridx = firstBarPainted; baridx <= lastBarPainted; baridx ++)
				{
					//get time of primary ser bar
					DateTime timeIdx = Time[CurrentBars[0] -( baridx)];
					//get index of corresponding secondary ser bar
					int oneMinuteIdx = BarsArray[1].GetBar(timeIdx);
					// get high of secondary bar
					double price = Closes[1][CurrentBars[1]-oneMinuteIdx];
					
					// draw line at secondary ser high, from primary ser bar to end of chartpanel.  
					float	xpos =  chartControl.GetXByBarIndex(ChartBars, baridx);
					float y =  chartScale.GetYByValue(price);
					Point startPoint	= new Point(xpos, y);
					Point endPoint	= new Point(ChartPanel.X + ChartPanel.W, y);
					RenderTarget.DrawLine(startPoint.ToVector2(), endPoint.ToVector2(), LineBrushDx, 2);
				}
			}catch (Exception ex){Print(Instrument.MasterInstrument.Name.ToString() + " " + BarsPeriod.BarsPeriodType.ToString() + " " +BarsPeriod.Value.ToString() + " " + Name.ToString() + " : " + ex.ToString());}		
		}

Help would be much appreciated.

[NinjaTrader_DaveI]

Hello,

Thank you for sharing this issue. It appears that the issue may stem from an unhandled exception resulting from the assignment of timeIdx. I'm currently investigating this issue, and I will post back on this thread with any updates. It may be that timeIdx simply needs to be assigned in a different way, or there could be something else going on that needs reported to our development team.

[palinuro]

Thanks, Dave. If you can think of any other way to do what I am wanting in the meantime, it would be much appreciated.

[palinuro]

I believe I have found the problem: every reference needs to specify the BarsArray (e.g., Times[0], CurrentBars[0], etc).

But I'd be interested to know why the code posted works on historical data, but not real-time data.

[NinjaTrader_DaveI]

I'm glad to hear you've resolved the issue. I had been seeing slightly different results in my testing. I saw the unexpected results on both historical (disconnected) data, and live (connected) data. However, at the moment a connection was made, I saw the lines snap to their proper positions for an instant, then immediately jump back to the unexpected positions.

If using BarsArray as an argument resolved the issue for you, then I suspect the reason you were seeing good results when disconnected was that there were not any bar updates being processed, thus eliminating the possibility of your logic being processed on the wrong data series update, which would have come into play once live data started coming in for both elements of BarsArray.

[palinuro]

Yes, that makes sense. I had the same result when connected, with a momentarily correct chart followed by the incorrect one. But no problems at all since I specified the references.