Draw plot values in OnRender

[td_910]

Hi,
I'm trying to print bar numbers at the bottom or top of the chart within OnRender, but the code throws an index out of range error.

protected override void OnBarUpdate()
{
Values[0][0] = Bars.BarsSinceNewTradingDay;
}

protected override void OnRender(ChartControl chartControl, ChartScale chartScale)
{
base.OnRender(chartControl, chartScale);

SharpDX.Direct2D1.Brush dxBrush = FNTcolor.ToDxBrush(RenderTarget);
TextFormat textFormat = TextFontta.ToDirectWriteTextFormat();
double y = DrawAtTop ? 5 + TextOffset * textFormat.FontSize : ChartPanel.H - 35 - TextOffset * textFormat.FontSize;
double startX = -1;
int daysOnChart = 0;

for (int barIndex = ChartBars.FromIndex; barIndex < ChartBars.ToIndex; barIndex++)
{
if (barIndex > 0 && barIndex < ChartBars.ToIndex)
{
string myString = barIndex.ToString("N0");
// string myString = Values[0][barIndex].ToString("N0");

startX = chartControl.GetXByBarIndex(ChartBars, barIndex);
Point startPoint = new Point(startX, y);
TextLayout textLayout = new TextLayout(Globals.DirectWriteFactory, myString, textFormat, TextWidth , textFormat.FontSize);
RenderTarget.DrawTextLayout(startPoint.ToVector2() , textLayout, dxBrush);
textLayout.Dispose();
}
}

textFormat.Dispose();
}

Printing the barIndex works, but not printing the plot values.

string myString = barIndex.ToString("N0");
// string myString = Values[0][barIndex].ToString("N0");

I'd appreciate any help.

Thomas

[NinjaTrader_ChelseaB]

Hello Thomas,

The issue is likely from calling Values[0][barIndex] without using TriggerCustomEvent() from the non-data-driven method.
Help guide: NinjaScript > Language Reference > Common > TriggerCustomEvent()

I would recommend instead using Values[0].GetValueAt(CurrentBar - barIndex).ToString() instead of calling TriggerCustomEvent() as this will use less CPU demand.
Help guide: NinjaScript > Language Reference > Common > ISeries<T> > GetValueAt()
Help guide: NinjaScript > NinjaScript Best Practices > Error handling practices > barsAgo indexer vs. absolute bar Index

[td_910]

Hello Chelsea,

Many thanks. That works perfectly.
One more question: Is it possible to format the values of a plot in the Data Box?
E.g. the bar numbers show up as 1.00 for bar number 1.
As far as I know there are no int plots?

Hello Thomas,

The issue is likely from calling Values[0][barIndex] without using TriggerCustomEvent() from the non-data-driven method.
Help guide: NinjaScript > Language Reference > Common > TriggerCustomEvent()

I would recommend instead using Values[0].GetValueAt(CurrentBar - barIndex).ToString() instead of calling TriggerCustomEvent() as this will use less CPU demand.
Help guide: NinjaScript > Language Reference > Common > ISeries<T> > GetValueAt()
Help guide: NinjaScript > NinjaScript Best Practices > Error handling practices > barsAgo indexer vs. absolute bar Index

[NinjaTrader_ChelseaB]

Hello td_910,

Indicator Plot Series are always Series<double>.

To control the decimals for a plot override the FormatPriceMarker() method.
Below is a link to the help guide.

https://ninjatrader.com/support/helpGuides/nt8/formatpricemarker.htm