Performance issues with Draw.Text in an indicator

[erkees]

Hi,

I'd like to draw a text for every bar.

This looks like:

In the method OnBarUpdate:
Draw.Text(this,"Volume" + CurrentBar,myVolume.ToString(),1,High[1]);

If I run this on a tick chart I get severe performance problems with NinjaTrader.

Is there any possibility to solve this performance problem? I tried it with MaximimumBarsLookBack = 256, but that didn't help.

Thanks in advance,

erkees

[NinjaTrader_ChelseaB]

Hello erkees,

Unfortunately, if you plan to draw on every bar this will take a large amount of resources to draw this many objects.

You would need to limit the number of objects drawn.

You could use a counter to draw a certain number of objects.

private int counter = 0;

if (counter < 255)
{
 ++counter;
}
else 
{
counter = 0;
}

Draw.Text(this,"Volume" + counter,myVolume.ToString(),1,High[1]);

After the counter resets, it will begin moving the bars and will only have 256 on the chart at any given time.

However, this will still require that the drawing be drawn and moved as the historical data processes.

You could also limit the amount of drawings in historical data.

if (CurrentBar < BarsRequiredToPlot || (State == State.Historical && CurrentBar < Math.Max(1, Count - 256)))
return;

This would stop the script from processing if there are not enough bars to plot or if there are more than more than 256 bars and current bar is not within the last 256 bars.

[erkees]

Hi Chelsea,

thanks for your answer - that should solve the problem.

Thanks,

erkees