How to increase the arrow size on oint

Question

With my font of choice (for other reasons), the arrow indicating the orientation of the contour appears very small. Is there a way to increase its size, specifically the arrowhead? There is no shaft.

\documentclass[10pt]{article}
\usepackage[charter]{mathdesign}
\usepackage{XCharter}
\begin{document}
Evaluate \[\ointctrclockwise_C \frac{z}{2z+3}\,dz,\] where $C$ is the unit circle.
\end{document}

Please try to reduce your code to the absolute minimum. It does not compile here and fore sure, not all packages are needed. You should be more specific on what to increase. The arrow head or the whole thing including it's shaft (and line width)? Are arrows from other fonts a solution? Are you able to use Xe- or LuaLaTeX? — LaRiFaRi, Apr 10 '15 at 05:45
I've edited the question to reflect your suggestions. I would like a solution using this font with pdfLaTeX. — DJJerome, Apr 10 '15 at 09:55
mathdesign defines that integral with DeclareMathSymbol (in mdbch.sty) so it's just what's defined in the font. But you could try making your own version by combining the normal integral with a circular arrow if you can find one you prefer. — Thruston, Apr 10 '15 at 10:48
If you mean that you can do better arrow than font designer then you can find the file md-chrmb.pfb in your system, open it by fontforge program, find the character anticlockwisecontintegraldisplay, edit this character and generate new md-chrmb.pfb for your personal use. — wipet, Apr 10 '15 at 12:09

score 2 · Answer 1 · answered Nov 29 '15 at 03:04

One way to do this is to take a counterclockwise arrow symbol, \circlearrowleft from the amsmath package, and then scale, rotate, and align it. This produces a nice-looking \oint whose circular arrow can be made as large as you like; however, you have to adjust the scaling and aligning parameters correspondingly.

In the following code, you can adjust the integral in several ways. \rotatefactor is the amount, in degrees, that the symbol was rotated; and \scalefactor indicates how much it was scaled. If you adjust these, you'll have to play with \raiseamt, which controls the vertical location of the arrow, and \leftamt, which controls its horizontal location.

\usepackage{amsmath}  % for \circlearrowleft
\usepackage{rotating} % for \rotatebox
\usepackage{graphicx} % for \scalebox

\newcommand{\scalefactor}{1.55}
\newcommand{\rotatefactor}{-73}
\newcommand{\raiseamt}{0.7em}
\newcommand{\leftamt}{-1.22em}

\newcommand{\bigoint}{%
  \raisebox{\raiseamt}{%
    \rotatebox{\rotatefactor}{%
      \scalebox{\scalefactor}{\(\circlearrowleft\)}%
    }%
  }%
\hspace{\leftamt}\int\limits}

Then, in your document, the following code

\[
  3+\ointctrclockwise_C \frac{z}{2z+3}\,dz
  \quad\mathrm{versus}\quad
  3+\bigoint_C \frac{z}{2z+3}\,dz
\]

produces

If this is too big, too small, etc., just fiddle with the parameters.

Things I don't like about this solution: (1) the arrow itself is kind of thick. Perhaps just replacing the head with a scaled ^ symbol would suffice; such a solution could use the same approach as this one. (2) I feel like the spacing isn't perfect; the fraction is too close to the integral. I guess this is kind of unChartered territory, though.

How to increase the arrow size on oint

1 Answers1

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