Event for detecting when chart moves

[JohnSteinberg]

Hi,

I wrote an indicator that draws some rectangles based on user selection. The problem I have is that when the chart shifts left or right (either by user input or more data) the objects stay at their original position naturally.

Is there an event I can subscribe for, or any other method, that would fire when the chart moves so that I can also re position my custom drawn objects?

Thanks for any help.

[NinjaTrader_JessicaP]

Hello JohnSteinberg, and thank you for your question.

Drawing objects have tags associated with them. For example, a signature for Draw.Rectangle looks like this :

Draw.Rectangle(NinjaScriptBase owner, string tag, int startBarsAgo, double startY, int endBarsAgo, double endY, Brush brush)

emphasis mine.

Whenever you call Draw.Rectangle with the same tag again, it will modify the rectangle referred to by that tag rather than drawing a new one. This means that, just as a for instance, you can call this every time you call OnBarUpdate with 5 and 0 for start and end BarsAgo, respectively, to advance a 5 bar wide rectangle forward 1 bar for every bar you advance 1 bar.

Please let us know if there are any other ways we can help.

[JohnSteinberg]

Hi Jessica P,

Thank you very much for the reply. I think I have found part of my problem. I am drawing the rectangles in the plot override of the indicator with graphics.FillRectangle instead of using DrawRectangle.

Thanks for your suggestion, I will definitely try it out. I will let you know what I find.

Kind Regards,
JohnSteinberg

[JohnSteinberg]

For anyone that might read this, using DrawRectangle instead of graphics.FillRectangle in the Plot override solved the problem for me.

Thanks again for your reply Jessica P