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Is there a way to personalize the lines constructed with dim? Make them dotted and red, for instance?
\documentclass[tikz,border=2cm]{standalone}
\usepackage{tkz-euclide}
\begin{document}
\begin{tikzpicture}
\tkzDefPoints{0/3/A, 0/-3/B}
\tkzDrawPoints(A,B)
\tkzDrawSegment[dim={\(l\),2cm,right=2mm}](A,B)
\tkzLabelPoints[left](A,B)
\end{tikzpicture}
\end{document}
It seems the style of \tkzDrawSegment[dim={...}] is hardcoded, and is written directly in pgf codes. Currently I am not capable of extending it and providing flexible user options, and below is my first try.
dim color, restrict scopedim option in terms of decoration show path construction. New styles dim style and dim fence style.\documentclass[tikz,border=2cm]{standalone}
\usepackage{tkz-euclide}
\makeatletter
% originally defined in tkz-obj-eu-draw-lines.tex
\def\tkz@DrawSegment[#1](#2,#3){%
% replace \(begin|end)group with \(|end)scope
\scope
\pgfqkeys{/tkzdraws}{#1}
\draw[line style,add=0 and 0,#1] (#2) to (#3);
\endscope
}%
\pgfdeclaredecoration{add dim}{final}{
\state{final}{%
\pgfmathsetmacro{\dist}{\pgfkeysvalueof{/pgf/decoration/distance}}
\pgfpathmoveto{\pgfpoint{0pt}{0pt}}
\pgfpathlineto{\pgfpoint{0pt}{1.2*\dist}}
\pgfpathmoveto{\pgfpoint{\pgfdecoratedpathlength}{0pt}}
\pgfpathlineto{\pgfpoint{(\pgfdecoratedpathlength}{1.2*\dist}}
% start of patch
\pgfusepath{stroke}
\pgfsetarrowsstart{latex}
\pgfsetarrowsend{latex}
\expandafter\pgfsetdash\tkz@dim@dashpattern
\pgfsetstrokecolor{\tkz@dim@color}
% end of patch
\pgfpathmoveto{\pgfpoint{0pt}{\dist}}
\pgfpathlineto{\pgfpoint{\pgfdecoratedpathlength}{\dist}}
\pgfusepath{stroke}
\pgfpathmoveto{\pgfpoint{0pt}{0pt}}
\pgfpathlineto{\pgfpoint{\pgfdecoratedpathlength}{0pt}}
}}
\tikzset{
dim color/.store in=\tkz@dim@color,
dim color=black,
% similar to code for \tikzoption{dash pattern}{...}
dim dash pattern/.code={%
\def\tikz@temp{#1}%
\ifx\tikz@temp\pgfutil@empty%
\def\tkz@dim@dashpattern{{}{0pt}}%
\else%
\def\tikz@dashpattern{}%
\expandafter\tikz@scandashon\pgfutil@gobble#1o\@nil%
\edef\tkz@dim@dashpattern{{\tikz@dashpattern}{\noexpand\tikz@dashphase}}%
\fi
},
dim dash pattern=,
}
\makeatother
\begin{document}
\begin{tikzpicture}
\tkzDefPoints{0/3/A, 0/-3/B}
\tkzDrawPoints(A,B)
\tkzDrawSegment[dim={\(l_0\),1cm,right=2mm}, dim color=red, dim dash pattern={on 2pt off 2pt}](A,B)
\tkzDrawSegment[dim={\(l_1\),2cm,right=2mm}, dim color=red](A,B)
\tkzDrawSegment[dim={\(l_2\),3cm,right=2mm}](A,B)
\tkzLabelPoints[left](A,B)
\end{tikzpicture}
\end{document}
I've opened a feature request here: https://github.com/tkz-sty/tkz-euclide/issues/5.
Update, Dec 6 2021
Rework option dim to support styles dim style and dim fence style which accept general tikz options.
\documentclass{article}
\usepackage{tkz-euclide}
\makeatletter
% originally defined in tkz-obj-eu-draw-lines.tex
\def\tkz@DrawSegment[#1](#2,#3){%
\scope
\pgfqkeys{/tkzdraws}{#1}
\draw[line style,add=0 and 0, #1] (#2) to (#3);
\endscope
}
% rework `dim` option using decoration `show path construction`
\tikzset{
dim/.style args={#1,#2,#3}{%
postaction={
decoration={
show path construction,
lineto code={
% dim fence
\draw[dim fence style/.try]
(\tikzinputsegmentfirst) --
($ (\tikzinputsegmentfirst)!1.2*(#2)!90:(\tikzinputsegmentlast) $)
(\tikzinputsegmentlast) --
($ (\tikzinputsegmentlast)!1.2*(#2)!-90:(\tikzinputsegmentfirst) $);
% dim
\draw[dim style/.try]
($ (\tikzinputsegmentfirst)!#2!90:(\tikzinputsegmentlast) $) --
node[inner sep=0pt, font=\footnotesize, fill=\tkz@fillcolor, pos=.5, #3] {#1}
($ (\tikzinputsegmentlast)!#2!-90:(\tikzinputsegmentfirst) $);
}
},
decorate,
}
},
dim/.default={,0pt,},
dim style/.style={
latex-latex,
},
}
\makeatother
\begin{document}
\begin{tikzpicture}
\tkzDefPoints{0/3/A, 1/-3/B}
\tkzDrawPoints(A,B)
% test new style `dim style`
\tkzDrawSegment[dim={\(l_0\),1cm,right=2mm},
dim style/.append style={red, dash pattern={on 2pt off 2pt}}](A,B)
\tkzDrawSegment[dim={\(l_1\),2cm,right=2mm},
dim style/.append style={blue}](A,B)
\tkzDrawSegment[dim={\(l_2\),3cm,right=2mm}](A,B)
% test new style `dim fence style`
\tkzDrawSegment[dim={\(l_3\),-2cm,right=2mm},
dim style/.append style={orange},
dim fence style/.style={dashed}](A,B)
\tkzLabelPoints[left](A,B)
\end{tikzpicture}
\end{document}
It's possible to rework dim in terms of execute at end to but there's currently an issue about this option, see pgf-tikz/pgf#1086.
% rework option `dim`, using `execute at end to` instead of `decorate`
% FIXME: `execute at end to` will affect the graphics state of original `to`
% see https://github.com/pgf-tikz/pgf/issues/1086
\tikzset{
dim/.style args={#1,#2,#3}{%
execute at end to={
\draw[dim fence style/.try] % is "fence" an appropriate name?
(\tikztostart) -- ($ (\tikztostart)!1.2*(#2)!90:(\tikztotarget) $)
(\tikztotarget) -- ($ (\tikztotarget)!1.2*(#2)!-90:(\tikztostart) $);
\draw[dim style/.try]
($ (\tikztostart)!#2!90:(\tikztotarget) $)
-- node[black, inner sep=0pt, font=\footnotesize, fill=\tkz@fillcolor, #3] {#1}
($ (\tikztotarget)!#2!-90:(\tikztostart) $);
}
},
% init
dim/.default={,0pt,},
dim style/.style={
latex-latex,
},
}
\pgfsetdash{{0.1cm}{0.1cm}{0.1cm}{0.1cm}}{0cm}, which is even less flexible than mine.
Jul 14, 2020 at 12:53
tkz-euclide is designed to make geometrical figures and I think it is better to use TikZ for this kind of problem.
Dec 3, 2021 at 14:50
dim color, so it's now optional as well. dim provides a far better interface than tikz codes, and using colors in geometrical figures really enhances expression. A combined style key like dim style would be better, but then manually communication between tikz options and pgf drawing codes is unavoidable.
Dec 3, 2021 at 22:45
Here is an easy way with plain TikZ. In case you need a lot of such dimline, then simly make a new command.
\documentclass[tikz,border=5mm]{standalone}
\begin{document}
\begin{tikzpicture}
\path
(0,3) coordinate (A) node[left]{$A$}
(0,-3) coordinate (B) node[left]{$B$};
\draw[red,dotted] (A)--+(0:2.5) (B)--+(0:2.5);
\draw[red,<->] ([shift={(0:2)}]A)--([shift={(0:2)}]B) node[midway,right]{$l$};
\draw[thick,blue] (A)--(B);
\fill[blue] (A) circle(1.5pt) (B) circle(1.5pt);
\end{tikzpicture}
\end{document}
