Cfrgtkky

When I use the arc symbol in LaTeX, I use this piece of code (adding to the preamble):

usepackage{scalerel}

usepackage{stackengine}

stackMath

newsaveboxtmpbox

newcommandreallywidefrown[1]{

    ThisStyle{

        sboxtmpbox{$SavedStyle#1$}

        stackon[0pt]{usebox{tmpbox}}{

            stretchto{

                scaleto{

                    scalerel*[wdtmpbox]{mkern-.8mufrownmkern-.8mu}

                    {rule[-textheight/2]{1ex}{textheight}}

                }{textheight}

            }{0.8ex}

        }

    }

}

(Source: Steven B. Segletes' answer)

It outputs a very good arc symbol:

documentclass{article}

usepackage{scalerel}

usepackage{stackengine}

stackMath

newsaveboxtmpbox

newcommandreallywidefrown[1]{

    ThisStyle{

        sboxtmpbox{$SavedStyle#1$}

        stackon[0pt]{usebox{tmpbox}}{

            stretchto{

                scaleto{

                    scalerel*[wdtmpbox]{mkern-.8mufrownmkern-.8mu}

                    {rule[-textheight/2]{1ex}{textheight}}

                }{textheight}

            }{0.8ex}

        }

    }

}

begin{document}

$reallywidefrown{AB}$qquad$reallywidefrown{ABC}$

end{document}

Now I am typing a document which is about trigonometry, and the trigonometric arc symbol should look like this

(I use Windows Paint. Sorry for bad quality, but I can't find a better way to illustrate the symbol)

I went to Detexify to get the command curvearrowright in the amssymb package. However, it looks too short:

documentclass{article}

usepackage{amsmath}

usepackage{amssymb}

begin{document}

$overset{curvearrowright}{AB}$qquad$overset{curvearrowright}{ABC}$

end{document}

Is there any way to define a command like reallywidecurvearrowright{} (or shorter like trigarc{} 😃) so that the length of the symbol suits the length of the letters below it, like what Segletes' reallywidefrown{} does?

Actually the task would be much easier to me if I understand what Segletes wrote, but unfortunately I understand nothing ☹️ So I will thank you very much if you show me a brief explaination of the reallywidefrown{} definition.

Any help will be highly appreciated!

You could use the tikzmark toy for this:

documentclass{article}



usepackage{tikz}

usetikzlibrary{tikzmark}



newcounter{carrowover}

newcommand{carrowover}[2][2ex]{stepcounter{carrowover}tikzset{tikzmark

prefix=thecarrowover}tikzmark{start}#2tikzmark{stop}tikz[remember

picture, overlay]{draw[->]([shift={(.5ex,#1)}]pic cs:start) to[bend

left] ([shift={(-.5ex,#1)}]pic cs:stop);}}



begin{document}

( carrowover{ABC} )



( carrowover[1.5ex]{abc} )

end{document}

Note you need to compile twice to get the correct placement. I have provide an optional argument to carrowover that specifies the vertical position of the arrow (relative to the baseline).

tikzmark works by saving positions and that can be used in a subsequent tikz picture. To specify unique names for these positions I have introduced a counter and used the tikzmark prefix option to adjust the labels each time.