Erasing old plot data

[ballboy11]

I was wondering if there is a way to erase old plot data. I created target lines and I want to erase the old target lines.


AddPlot(new Stroke(Brushes.Red, 2), PlotStyle.Hash, "Target2"); //6

everything is working well but the last 2 tasks are :

Remove old plots,

Inherit Plot brush color so I can use it for Draw.Text.

Add plot can be changed in my parameters

[NinjaTrader_Jim]

Hello ballboy11,

Thanks for opening the thread.

There is not a built in function to remove plots like you can with draw objects and RemoveDrawObject(). You could convert your plots to Draw Objects, or you can utilize one of the following approaches to accomplish this.

You can use PlotBrushes to change the Brush for a plot that occurred so many bars ago.

PlotBrushes[0][5] = Brushes.Blue;

This will set the first Plot's Brush from 5 bars ago to be blue. PlotBrushes will hold the Brush to be used for that plot. You could reference that PlotBrushes to get the assigned Brush so you can apply it to Draw.Text()

You can also reset the DataSeries for that Plot to set the value from a certain number of bars ago to 0.

MyPlot.Reset(10);

This will reset the value from 10 bars ago to 0.

More information on PlotBrushes and Resetting a Plot's Data Series can be referenced in the help guide below.

PlotBrushes - https://ninjatrader.com/support/help...lotbrushes.htm

DataSeries.Reset - https://ninjatrader.com/support/help...n-us/reset.htm

This topic was previously discussed for NinjaTrader 7. Here is a link to the forum post if you would like to reference other client's experiences: http://ninjatrader.com/support/forum...ad.php?t=54550

Changing Plot parameters in the indicator dialog window is possible. The ArePlotsConfigurable bool must be set to true. Please see the documentation here for details: https://ninjatrader.com/support/help...nfigurable.htm

Please let me know if you have any questions.

[ballboy11]

Plots and number of bars back

I tried the reset and it gives me an index error,
How can I find the index of the first bar on the screen?

[NinjaTrader_Jim]

Hello ballboy11,

Thanks for the reply.

My example for calling Reset on 10th bar ago would require 10 bars otherwise it would throw an indexing error.

You can read more about resolving indexing issues involving having enough bars here: http://ninjatrader.com/support/forum...ead.php?t=3170

If you would like to find the bar index for the left most bar on the screen, you should override OnRender() and use ChartBars to reference the FromIndex. You may refer to the documentation below for complete usage and understanding.

FromIndex - http://ninjatrader.com/support/helpG..._fromindex.htm

OnRender() - http://ninjatrader.com/support/helpG...s/onrender.htm

Please let me know if I may be of further assistance.