Dear Experts, I have plotted scatter plot as attached. I have drawn two bars on that plot. I want to make these two bars transparent so that I can see the data points. I have written in the macro as below. TCanvas *cv1 = new TCanvas(“cv1”,"",600,600); tr->Draw(“Bmass : Mumumass >> h_mm”,selbm1); …

Hi, did you try to set the colour alpha? https://root.cern.ch/doc/master/classTAttFill.html#a5fff502945c593f3387176d01b4c22ea Cheers, D

Hi, I have tried with alpha. But it is not working. Thanks, Deepak

Hi, what ROOT version are you using on what platform and with what configuration parameters? Cheers, D

Try a brutal fix … after drawing both boxes, add: tr->Draw(“Bmass : Mumumass”, selbm1, “same”);

Alpha is not supported for all graphics output: [image] Displaying Z axis graduation in Colz option ROOT Interesting, could you place a note to that affect in TAttFill or TAttFill::SetFillColorAlpha?

As said here The transparency is available on all platforms when the flag OpenGL.CanvasPreferGL is set to 1 in $ROOTSYS/etc/system.rootrc, or on Mac with the Cocoa backend. On the file output it is visible with PDF, PNG, Gif, JPEG, SVG … but not PostScript.

Making bar transparent in a scatter plot

ROOT

ksmith August 24, 2017, 7:33pm 6

Alpha is not supported for all graphics output: