# anchor arrow start position

Attached below is the minimum working example. I would like the arrow to end at the west anchor of the node "operation". I tried anchor and few other possibilities but they don't seem to affect the edge position.

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes,positioning}
\begin{document}
\tikzstyle{operator}=[shape=rectangle, rounded corners, fill=cyan, draw=cyan]

\begin{tikzpicture}
\node[data] (uncurated) {content};
\path node[operator] (schematize) [below = of uncurated.south]{operation}
edge[<-,thick]  node[auto]{\tiny flow} (uncurated.south);
\end{tikzpicture}
\end{document}


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Please ensure that the posted code can be cut and pasted to into a document. The version you had posted had all the square brackets escaped fro some reason. – Peter Grill Apr 16 '13 at 19:41
\path node[operator, below=of uncurated] (schematize) {operation} (schematize.west) edge[<-,thick] node[auto]{\tiny flow} (uncurated.south); works for me. – Qrrbrbirlbel Apr 16 '13 at 19:44
Actually, this solution works better. Thanks. – Sandeep Apr 16 '13 at 20:54

It might be easier to just use a separate draw command and specify the in= and out= angles:

## Code:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes,positioning}
\begin{document}
\tikzstyle{operator}=[shape=rectangle, rounded corners, fill=cyan, draw=cyan]

\begin{tikzpicture}
\node[data] (uncurated) {content};
\path node[operator] (schematize) [below = of uncurated.south]{operation}
edge[<-,thick]  node[auto]{\tiny flow} (uncurated.south);
\path [->, thick, red] (uncurated.south) edge (schematize.west);
\end{tikzpicture}
\begin{tikzpicture}
\node[data] (uncurated) {content};
\path node[operator] (schematize) [below = of uncurated.south]{operation}
edge[<-,thick]  node[auto]{\tiny flow} (uncurated.south);
\path [->, thick, blue] (uncurated.south) edge[out=-145, in=180] (schematize.west);
\end{tikzpicture}
\end{document}

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That works. Thanks so much. For some reason reading the manual didn't give me a hint that I could mix the draw and edge primitives. – Sandeep Apr 16 '13 at 19:45
@Sandeep You shouldn't. Use \path if you use edge and not \draw. Do you see the lonely blue up-arrow at the content node? – Qrrbrbirlbel Apr 16 '13 at 19:47
@Qrrbrbirlbel by lonely you mean the arrow head is dislodged from trunk of the arrow? If so, yes. Will you path and edge. – Sandeep Apr 16 '13 at 20:18
@Sandeep Yes, that's caused by using \draw and edge together. The reason is a zero-length line from and to (uncurated.south). The calculated direction for such a zero-length line is 90° (atan(∞)). The edge operator creates sub-paths. – Qrrbrbirlbel Apr 16 '13 at 20:27
@Qrrbrbirlbel: Thanks, I did not know that one should use \path instead of \draw with an edge. I normally don't use edge and am used to using to instead. – Peter Grill Apr 16 '13 at 21:10

Sometimes the easiest way to achieve the good results in TikZ is to place nodes first and then draw the lines:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes,positioning}
\begin{document}
\tikzstyle{operator}=[shape=rectangle, rounded corners, fill=cyan, draw=cyan]
\begin{tikzpicture}
\node [data] (uncurated) {content};
\node [operator] (schematize) [below=of uncurated] {operation};
\draw [-stealth] (uncurated) -- node [auto, swap] {\tiny flow} (schematize);
\end{tikzpicture}
\begin{tikzpicture}
\node [data] (uncurated) {content};
\node [operator] (schematize) [below=of uncurated] {operation};
\draw [-stealth] (uncurated) -- node [auto, swap] {\tiny flow} (schematize.west);
\end{tikzpicture}
\end{document}


Note that you do not have to use anchors always (e.g., below=of uncurated is the same as below=of uncurated.south and placing only node names in \draw allow TikZ to calculate the anchors automagically.

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