how to clear/clean/remove all RenderTarget items

[ttodua]

Hi.
inside OnRender, I draw different objects by i.e. `RenderTarget.DrawLine` ,`RenderTarget.DrawTextLayout` etc...

however, on each script change/update, I get the duplicated items drawn (seems, the previous drawings are not removed).

shortly, how to make the OnRender function, to clean/remove all previous execution's drawn items?
(the same result when I remove indicator from chart and re-attach again, then it draws items on clean chart... i want the same to happen on each OnRender re-execution)

[NinjaTrader_Jesse]

Hello,

Thank you for the post.

OnRender is not like the drawing tools where you have a Tagging system, there is no cleanup of the lines needed. The only cleanup you would need to do would be resources like your TextLayout would need to be disposed of, but that would not draw a duplicate line on the next pass if you had not disposed of it.

When OnRender is called, it is run from top to bottom to supply the platform with render information. That is used when the chart is repainted. There is no caching of this information so when your logic says to draw a line that happens or when your logic stops saying to draw that line, it would no longer be drawn or visible.

Based on your comments, it sounds like whatever logic you are using to do the drawing is also duplicating the lines. Are you currently using conditions to draw the lines and then store information to variables or file? In short, we would need more information on the logic you are using to understand why that is being duplicated. If you have a simple example that demonstrates the duplication, we could review that together to see why that is happening.


I look forward to being of further assistance.