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append after command uses a similar approach for saving the node’s name as the tree uses to connect the nodes. For this, I borrow most of the code from a label or a pin and apply it in your example, too. I am using edges here since with your \pgfextra example, you would also need the additional \pgfinterruptpath. Unfortunately, both implementations do not ...

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Although its 729 pages (1129 in last cvs) are intimidating, TiKZ manual provides a lot of useful information.

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The problem is that your are using font specific units to set the text width (em) and these units are different for bold and non bold text. Try to use cm instead and the problem disappears. \documentclass[a4paper,landscape]{article} \usepackage{tikz} \usetikzlibrary{shapes,shadows,arrows,positioning,graphs} \begin{document} \centering \begin{tikzpicture} ...

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You are using minimal document class where font size commands will not be available (Refer this answer). Use some other class and things work: \documentclass[]{standalone} \usepackage{paralist,pst-func, pst-plot, pst-math, pstricks-add,pgfplots} \usetikzlibrary{patterns,matrix,arrows} \pgfplotsset{compat=1.9} \begin{document} \begin{tikzpicture} ...

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The options you present to \draw will be applied to the first segment alone. You can group all your snake edges in to a scope and put every edge/.style={draw,snake arrow} as the option to the scope to make it local. \documentclass[a4paper,12pt]{amsart} \usepackage[utf8]{inputenc} \usepackage{tikz} \usetikzlibrary{arrows,calc,decorations.pathmorphing} ...

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