circuitikzcoordinatesnodes
In tikzpicture, how do I get a single coordinate of a node?
This is the circuit I'm making, and I need to know the x coordinate of the node (opamp.out) so that i can make R2 vertically aligned with that node, and link it with a vertical line.
This is my code for R2:
\draw (opamp.-) to [short,*-] ++(0,1) node{} to [R,l=$R_2$]
++(2,0);
where, instead of ++(2,0), I would like to input ++(opamp.out.x-opamp.-.x,0);
Not sure if this is what you're looking to do. It's not as easy as you seem to want, but it is fairly straight-forward.
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc}
\usetikzlibrary{arrows.meta}
\begin{document}
\begin{tikzpicture}
\foreach \x in {0,1,2,...,10}
{
\coordinate (A\x) at ($(0,0)+(\x*0.5cm,0)$) {};
\draw ($(A\x)+(0,5pt)$) -- ($(A\x)-(0,5pt)$);
\node at ($(A\x)+(0,3ex)$) {\x};
}
\draw[ultra thick,arrows=->] (A0) -- (A10) -- ($(A10)+1.5*(1,0)$);
\end{tikzpicture}
\end{document}
It is important to note that you are not only using TikZ, but also PGFPlots. As described in section 4.17.1 (Accessing Axis Coordinates in Graphical Elements) in the manual, there are different coordinate systems in PGFPlots:
axis cs: the axis coordinate system
rel axis cs: a relative coordinate system, where the complete axis vectors are normalized to 1
axis direction cs: allows to use relative positions and directionsaxis description cs: useful for (of course) axis descriptionsticklabel cs:,xticklabel cs:,yticklabel cs:,zticklabel cs: for positioning the tick labelsxticklabel* cs:,yticklabel cs:,zticklabel cs: are the same as the non-starred versions, but do not take the size of any tick labels into accountAll of these are different from the default TikZ coordinate system. In your case, you'll probably want to use the axis coordinate system axis cs:, to place nodes at absolute coordinates within your axis. As @Thruston says in his comment, you can place a node within this (or any other of the above) coordinate system with
\node at (axis cs:0,0) {};
The developers of PGFPlots have designed PGFPlots to be fully backwards-compatible. New features, which would make old diagrams look different with a new version, are disabled by default and have to be enabled manually. This can be done with
\pgfplotsset{compat=*version*}
where *version* is the PGFPlots version number, e.g. 1.11 or 1.13.
As shown in a comment by @Torbjørn T., from version 1.11 on, the axis cs: coordinate system is the default, so you don't need to specify it at every use. Thus, with \pgfplotsset{compat=1.13} in your preamble, the diagram will look as you'd expect, without any changes to your code.
A small note: You specify the options [minimum size=3.7pt, fill=white, inner sep=0pt, shape=circle, draw] for every drawn point. If you want to change that later, you'd have to go through all nodes and change it. Alternatively, you can specify a style with
\begin{tikzpicture}[scale=0.8,
mydot/.style={minimum size=3.7pt, fill=white, inner sep=0pt, shape=circle, draw}
]
\node[mydot] at (-5, 70) {};
\end{tikzpicture}
With that, you'll only have to specify the style once.
Best Answer
An alternative: use of orthogonal coordinate
(p -| q)refers to the point horizontally aligned withpand vertically aligned withq. The-|was chosen in such a way that it's easy to remember which is which; the-side is horizontal, and the|side is vertical. The CircuiTikz manual has further information.Complete Examples:
Code: