How can I extract only the x or y part of a predefined coordinate?
For instance, let's say we have
\coordinate (A) at (1,2);
And I want to use the x part of (A) like this
\draw (x of A,3)--(0,0);
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Milo Wielondek
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I'm not aware of any direct syntax to do that (though I would love to have one). You can however use the let operation (section 14.15 in the TikZ v2.10 manual):
\usetikzlibrary{calc}
[...]
\draw let \p1 = (A) in (\x1,3) -- (0,0);
Caramdir
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For the second part of your question: You can do that with the |- syntax.
\coordinate (A) at (1,2);
\draw (A |- 0,3) -- (0,0);
Note that for pgfplots you need to set the version to at least 1.11 (e.g., \pgfplotsset{compat=1.11} or \pgfplotsset{compat=newest}) or use coordinates in the (axis cs:x,y) format for the intended behaviour.
Scz
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1You do not need
tmphere. You can use directly(A|-0,3)or even(A|-,3)(which is equivalent to(A|-1,3)) or(,3-|A). – Kpym Apr 04 '19 at 10:44 -
\pgfextractxshould work with\coordinate, but it doesn't. – Gonzalo Medina Mar 22 '11 at 02:19\newdimen\mydim,\pgfextractx\mydim{\pgfpointanchor{A}{center}}. – Caramdir Mar 22 '11 at 02:59\pgfpointanchoris what I didn't know. – Gonzalo Medina Mar 22 '11 at 16:01calctikzlibrary. – Martin Scharrer May 24 '11 at 18:42