TRootEmbeddedCanvas Drawing, loosing my drawing

ROOT
#1

This is a difficult problem to describe.

I have a dialog with a TRootEmbeddedCanvas. (It is a metrological display) I make a drawing in this canvas and then update some elements within the canvas for display. Example: I display wind vectors on a compass rose. The compass rose itself is a drawn element.

I also have another dialog box that does time series strip chart like plots. The primative I use for these is TGraph. Once I start updating this second dialog the orignal compass rose goes away, The vectors update fine. However, what I do with the vectors is each time I delete and redraw them. (This may be overkill to undraw them) I’d welcome a better way to do this.

My main priority is to get the compass rose back.

Regards
Chris

#2

Hi Chris,

Is it possible to reproduce what you are doing without the GUI, e.g. to create drawings in a TCanvas (wind vectors on a compass rose + TGraph object)? The TRootEmbeddedCanvas is a canvas without menus embedded in a frame and should not be a reason of problems you faced on.

Thank you, Ilka

#3

It is very reproducable. Are you asking for me to make a siimple program that illustrates the problem?

Regards,
Chris

#4

Hi Chris,

Yes, please provide as simple as possible macro that shows the problem.

Thank you, Ilka