Hello, I would like to plot grid lines at custom points (no equally spaced). Is it possible? I tried with TLines, but there is a problem when you zoom in. Thank you for your time. Regards, atd ROOT Version: ROOT 6.10/08 Platform: CC7 Compiler: gcc 4.8.5

Yes TLine is the way. Can you post a reproducer showing what you are doing ?

Hello, A working example, TH2D h("h","",10,0,10,10,0,10); h.Draw(); TLine aline(0,5,10,5); aline.Draw(); // looks ok, but if we zoom in... h.GetXaxis()->SetRangeUser(2,8); After zooming in, the line stands out the histogram. I would like to have something like the grid lines, so when you zoom …

Thanks a lot, it was what I was looking for! Just out of curiosity, why “TExec” is needed? Regards, atd

TExec is an object placed in the TCanvas display list. It executes the script passed in argument each time the canvas is painted. When you zoom the canvas it is automatically repainted with different values along the X axis therefore if you paint a line with fixed values, they do not take into accou…

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Histogram. Custom grid

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couet June 7, 2019, 7:42am 4

customgrid.C (354 Bytes)

Draw a TBox and TLine that resizes when zooming