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Curved over-head Arrows connecting Numbers

LaTeX Forum: Text Formatting

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Postby HunterDX77M on Sun Jul 22nd, 2012

Hello all,

I am going to be teach my student about the FOIL method of multiplication. In order to do that, I thought it would be a nice visual helper if I could draw arrows curving from one number to another and I was wondering if that was possible with LaTeX.

For example if I have (a + b)*(c + d), I want to draw an arrow coming out of "a" going over "b" and terminating at "c". Can that be done with LaTeX?

Thanks for any input! :D
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Postby cgnieder on Sun Jul 22nd, 2012

New German Q&A site about TeX:
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Postby localghost on Sun Jul 22nd, 2012

A soluton with pgf/tikZ.
Code: Select all  •  Open in online LaTeX editor

    \begin{tikzpicture}[>=stealth,baseline,anchor=base,inner sep=0pt]
      \matrix (foil) [matrix of math nodes,nodes={minimum height=0.5em}] {
        ( & a & + & b & ) & \cdot & ( & c & + & d & ) \\
      \path[->] ($(foil-1-2.north)+(0,1ex)$)   edge[red,bend left=45]    ($(foil-1-8.north)+(0,1ex)$)
                ($(foil-1-2.north)+(0,1ex)$)   edge[green,bend left=60]  ($(foil-1-10.north)+(0,0.5ex)$)
                ($(foil-1-4.north)+(0,0.5ex)$) edge[blue,bend left]      ($(foil-1-8.north)+(0,1ex)$)
                ($(foil-1-4.north)+(0,0.5ex)$) edge[orange,bend left=45] ($(foil-1-10.north)+(0,0.5ex)$);

The obtained output.
FOIL.png (7.71 KiB) Viewed 2591 times
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