coordinatestikz-pgf
In tikz I can perform absolute positioning, e.g. (current page.center), but how I can specify/transform the coordinates, so (0,0) within tikzpicture will end in well-defined place like center of the page or at the location of the node used in previous tikzpicture?
It's possibly very simple to obtain, but I skimmed PGF manual and cannot find it there.
While tabularx works, it's a bit overkill in this case.
\documentclass{article}
\usepackage[paperwidth=7in, paperheight=5in]{geometry}
\usepackage[english]{babel}
\usepackage[utf8x]{inputenc}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{tikz}
\usepackage[labelformat=empty]{caption}
\usepackage{tabularx}
\begin{document}
Examples
\begin{center}
\begin{minipage}[b]{.5\textwidth}
\centering
\begin{tikzpicture}[xscale=.5, yscale=.5]
\draw [<->,thick] (0,5) |- (5,0);
\draw [thick] (4,1) --(4,4);
\draw [thick, dashed] (4,1) -- (1,1) -- (1,4) -- (4,4);
\draw [fill] (4,1) circle [radius=0.1];
\draw [fill] (4,4) circle [radius=0.1];
\node at (2.5,2.5) {$A$};
\end{tikzpicture}
\captionof{figure}{$A$ is not open in $\mathbb{R}^{2}$.}
\end{minipage}%
\begin{minipage}[b]{.5\textwidth}
\centering
\begin{tikzpicture}[xscale=.5, yscale=.5]
\draw [<->,thick] (0,5) |- (5,0);
\draw [thick, dashed] (1,1) to [out=90, in=280] (1,4) to [out=30, in=150] (2,3.5) to [out=30, in=200] (4,4) to [out=40, in=90] (5,3) to [out=270, in=90] (4,1) to [out=180, in=30] (1,1);
\node at (2.5,2.5) {$A$};
\end{tikzpicture}
\captionof{figure}{$A$ is open.}
\end{minipage}
\medskip
\begin{minipage}[b]{.5\textwidth}
\centering
\begin{tikzpicture}[xscale=.5, yscale=.5]
\draw [<->,thick] (0,5) |- (5,0);
\draw [fill] (4,1) circle [radius=0.1];
\draw [fill] (2,1) circle [radius=0.1];
\draw [fill] (3,5) circle [radius=0.1];
\draw [fill] (1,3) circle [radius=0.1];
\end{tikzpicture}
\captionof{figure}{$A$ is not open.}
\end{minipage}%
\begin{minipage}[b]{.5\textwidth}
\centering
\begin{tikzpicture}[xscale=.5, yscale=.5]
\draw [<->,thick] (0,2) |- (5,0);
\draw [ultra thick] (1,0) --(3,0) node [above] {$A$};
\draw [fill=white] (1,0) circle [radius=0.1];
\draw [fill=white] (3,0) circle [radius=0.1];
\end{tikzpicture}
\captionof{figure}{$A$ is not open in $\mathbb{R}^{2}$ but open in $\mathbb{R}$.}
\end{minipage}
\end{center}
\end{document}
Note the % after the first \end{minipage} in each row, to avoid a spurious space. The center environment is just to remove indentations and to give some room after "Examples".
Use a different vertical space command instead of \medskip, if you prefer.
The \label commands are useless, as you don't number the captions. In any case, the strings should be different from each other.
As far as I know you can't address components of different coordinate systems. In fact, I don't think it makes too much sense. However, you can use orthogonal identifiers such as
\documentclass[border=5mm]{standalone}
\usepackage{pgfplots}
\usepackage{pgfplotstable} % For \pgfplotstableread
\pgfplotsset{compat=1.10}
\pgfplotstableread{
0.01 1.00
0.02 2.00
0.03 3.00
0.04 4.00
0.05 5.00
}\datatable
\begin{document}
\begin{tikzpicture}
\begin{axis}[ymin=0, ymax=6]
\addplot table {\datatable};
\node at (axis cs:0.02,3) {A};
\node at (rel axis cs:0.66,0.5){B};
\node at ({rel axis cs:0.66,0}|-{axis cs:0,1}){C}; %<=== Like this
\end{axis}
\end{tikzpicture}
\end{document}
Best Answer
Use the
shift={(<coordinate>)}TikZ key to shift the origin to this point. Use it either in the options for thetikzpictureor for an internalscopeenvironment. As usual in such cases thetikzpictureshould useremember picture,overlay.