Why yshift doesn't work in this TikZ example?

Question

Any idea why yshift doesn't work in the following TikZ example?

\documentclass{minimal}
\usepackage{tikz}
\begin{document}

\begin{tikzpicture}
  \coordinate (A) at (0,0);
  \coordinate (B) at (2.5,0);
  \draw (A) -- (B);
  \draw[yshift=2cm] (A) -- (B);
\end{tikzpicture}

\end{document}

possible duplicate of Shifting a line joining nodes in TikZ – Marco Daniel May 24 '13 at 10:16 — Marco Daniel, May 24 '13 at 10:16

score 29 · Accepted Answer · edited Mar 08 '12 at 22:32

29

It would work with coordinates or if you place the yshift inside the parentheses next to the name A and B:

\documentclass{minimal}
\usepackage{tikz}
\begin{document}

\begin{tikzpicture}
  \coordinate (A) at (0,0);
  \coordinate (B) at (2.5,0);
  \draw (A) -- (B);
  \draw ([yshift=2cm]A) -- ([yshift=2cm]B);
\end{tikzpicture}

\end{document}

Output:

alt text

edited Mar 08 '12 at 22:32

diabonas

25,784

answered Aug 11 '10 at 13:14

Stefan Kottwitz

231,401

Thanks but it looks odd the way yshift is specified. Any idea why? – Leo Liu Aug 11 '10 at 13:20
3

Coordinate transformations do not apply to a node. Its anchor remains the same. See section 15.11 of the pgf manual. – Stefan Kottwitz Aug 11 '10 at 13:38
2

I didn't know that one can apply transformations this way to coordinates (I would have used ($(A) - (0,2cm)$)) and the calc library. – Caramdir Aug 11 '10 at 13:40
Before the calc library ([yshift=2cm]A) was the only method, now we have the choice. – Alain Matthes Mar 08 '12 at 22:57
I don't understand. He is transforming a coordinate not node. In the example, A and B are defined with \coordinate. – Máté Wierdl Oct 30 '16 at 14:25

score 8 · Answer 2 · answered Mar 02 '15 at 16:52

In such a simple case you can use transform canvas:

\documentclass{minimal}
\usepackage{tikz}
\begin{document}

\begin{tikzpicture}
  \coordinate (A) at (0,0);
  \coordinate (B) at (2.5,0);
  \draw (A) -- (B);
  \draw[transform canvas={yshift=2cm}] (A) -- (B);
\end{tikzpicture}

\end{document}

Output:

Output

In more complex scenarios make sure to read the warnings in the PGF manual in section 25.4 Canvas Transformations:

Canvas transformations should be used with great care. In most circumstances you do not want line widths to change in a picture as this creates visual inconsistency. Just as important, when you use canvas transformations pgf loses track of positions of nodes and of picture sizes since it does not take the effect of canvas transformations into account when it computes coordinates of nodes.

Don't put some text around that ;) – percusse Mar 02 '15 at 17:01 — percusse, Mar 02 '15 at 17:01

Caramdir · Answer 3 · 2010-08-11T13:38:42.030

7

yshift (and similar commands) are applied to all coordinates in the path, not to the path as a whole. They are also not applied to anchors: according to the TikZ manual (section 15.11. in the 2.0 version):

Once the node x has been defined, you can use (x. anchor ) wherever you would normally use a normal coordinate. This will yield the position at which the given anchor is in the picture. Note that transformations do not apply to this coordinate, that is, (x.north) will be the northern anchor of x even if you have said scale=3 or xshift=4cm. This is usually what you would expect.

edited Aug 11 '10 at 13:38

answered Aug 11 '10 at 13:33

Caramdir

89,023
26
255
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2

I would have thought that \draw[yshift=2cm] (0,0) -- (2.5,0); and \draw[yshift=2cm] (A) -- (B);work the same way, since tikz simply subs (A) and (B) with the respective coordinates before doing the drawing. Note that A and B are defined to be coordinates not nodes. Where is this explained in the manual? – Máté Wierdl Oct 30 '16 at 14:33

Why yshift doesn't work in this TikZ example?

3 Answers3

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