Indicators in Strategies

[dibDab]

if I add an indicator to a strategy, is it ok to change the plot color OnBarUpdate?

[NinjaTrader_BrandonH]

Hello dibDab,

Thanks for your post.

If an indicator is added to a strategy using AddChartIndicator(), you would not be able to change the color of the indicator in the OnBarUpdate() method of the strategy.

The indicators plot color would need to be set in OnStateChange() when the State == State.DataLoaded. Note that you would need to define the brush color before calling AddChartIndicator().

else if (State == State.DataLoaded)
{
smaFast = SMA(Fast);
smaSlow = SMA(Slow);

smaFast.Plots[0].Brush = Brushes.Goldenrod;
smaSlow.Plots[0].Brush = Brushes.SeaGreen;

AddChartIndicator(smaFast);
AddChartIndicator(smaSlow);
}

Let me know if I may assist further,

[dibDab]

ok thanks.

ideally I'd like to change the PlotBrushes depending on the changing strategy variables?

[NinjaTrader_BrandonH]

Hello dibDab,

Thanks for your note.

Something you could consider doing is adding a plot to the strategy using AddPlot() and assigning the SMA indicator value to that plot.

PlotBrushes could then be used to change the color of a plot when a certain condition is true.

See the attached example script and screenshot demonstrating this.

And, see the help guide documentation below for more information and sample code.

AddPlot(): https://ninjatrader.com/support/help...ghtsub=addplot
SMA: https://ninjatrader.com/support/help...ghlightsub=sma
PlotBrushes: https://ninjatrader.com/support/help...lotbrushes.htm

Let me know if I may assist further.

[dibDab]

really helpful, thanks.

can I safely use something like PlotBrushes[0][0] = null;

[NinjaTrader_BrandonH]

Hello dibDab,

Thanks for your note.

If you set PlotBrushes to null, the default plot color defined in the AddPlot() method will be used. For example, if you call AddPlot(Brushes.Orange, "SMAPlot"); and then set PlotBrushes to null in OnBarUpdate(), the plot color will be orange.

To set a plot color to transparent, you could call PlotBrushes[0][0] = Brushes.Transparent;

Please let me know if you have any other questions.