New answers tagged coordinates
0
Easier to show than explain. The calc tikzlibrary can locate fractional distance between two points. The following locates (0.5,0.3) relative to the (img) node.
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{calc}
\begin{document}
\begin{tikzpicture}
\node[inner sep=0] (img) {\includegraphics{example-image}};
\coordinate (A) at ($(img.west)!...
0
The package xcoffins was created to put stuff (text, figures, tikz pictures, ...) into boxes and attach them using their relative positions, emulating a graphic layout program.
The work flow has four steps:
(1) Allocate the boxes (\New)
(2) Fill the boxes with the material (\Set).
(3) Join the boxes (\Join) using some of the predefined points (corners, ...
2
As @AndrewStacey wrote, you can very well define nodes with the coordinate shape in the middle of a path. Otherwise, just make sure the nodes have minimum size=0pt, inner sep=0pt, outer sep=0pt if you want “connecting lines” to reach their center.
The code below illustrates this for nodes A and Q of your example. I changed the two corresponding \fill ...
1
As already mentioned by @SebGlav, it seems that you are looking for a combination of two commands clip (which defines which part of the image is visible) and shift (which changes the origin).
To simplify this double command, you can define a new clip and shift style that does the job.
\documentclass[tikz,border=7pt]{standalone}
\tikzset{
% usage in scope ...
0
Maybe you would find use as bounding box syntax interesting. And then use a scope with shifting the coordinate system.
\documentclass[border=3.14mm,tikz]{standalone}
\begin{document}
\begin{tikzpicture}
\begin{scope}
\clip (6,2) rectangle (9,5);
\node[anchor=south west,inner sep=0] at (0,0)
{\includegraphics[width=0....
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