Take the 2-minute tour ×
TeX - LaTeX Stack Exchange is a question and answer site for users of TeX, LaTeX, ConTeXt, and related typesetting systems. It's 100% free, no registration required.

Is it possible to decorate a path with just a thick colored line above or below it? In the following example I faked manually the result, but how can I do it with decorations? In particular I want to be able to choose the color and the line width and use the raise option of the decoration.

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{calc}
\begin{document}

\begin{tikzpicture}
   \coordinate (A) at (0,0);
   \coordinate (B) at (1,1);
   \coordinate (v) at ($(B) - (A)$);

   \path let \p1 = (v) in ($1/(\x1^2 + \y1^2)^(0.5)*(\y1,-\x1)$) coordinate (p);
   \pgfmathsetmacro{\dist}{0.7}
   \coordinate (AA) at ($(A) + \dist*(p)$);
   \coordinate (BB) at ($(B) + \dist*(p)$);

   \draw (A) -- (B);
   \draw[thick,orange] (AA) -- (BB);
\end{tikzpicture}
\end{document}

output

Edit: If it is not possible to get it via decorations is it possible to define a style just for straight lines which allows you to draw two or three colored lines just like here: http://tex.stackexchange.com/a/36858/4011 in the case of circles.

share|improve this question
    
Do you want this to work with curves and polygons, or just with straight lines? –  Jake Oct 8 '12 at 12:46
    
For my current application I want it only for straight lines. –  student Oct 8 '12 at 12:50
    
But if it is possible to do it with decorations, then it should automatically work with arbitrary path's...? –  student Oct 8 '12 at 12:51
    
Take a look at: tex.stackexchange.com/q/29991/86 Is that the sort of thing you are after? –  Loop Space Oct 8 '12 at 12:53
    
@AndrewStacey Thanks, but I think this doesn't really help. I want to know how to do it with decorations and the inside-outside problem doesn't matter in my case... –  student Oct 8 '12 at 13:00
show 3 more comments

1 Answer 1

Will using double help here?

\documentclass{standalone}
\usepackage[svgnames]{xcolor}
\usepackage{tikz}
\usetikzlibrary{calc}
\begin{document}

\begin{tikzpicture}
   \coordinate (A) at (0,0);
   \coordinate (B) at (1,1);
   \coordinate (v) at ($(B) - (A)$);

   \path let \p1 = (v) in ($1/(\x1^2 + \y1^2)^(0.5)*(\y1,-\x1)$) coordinate (p);
   \pgfmathsetmacro{\dist}{0.7}
   \coordinate (AA) at ($(A) + \dist*(p)$);
   \coordinate (BB) at ($(B) + \dist*(p)$); 
   \draw[line width=5pt,orange,double=black,double distance=1pt] (AA) -- (BB);

   \begin{scope}[xshift=4cm]
   \draw[very thick, orange,double=black,double distance=1pt] (-0.1,5) .. controls (-4,-2) and (4,-2) .. (0.1,5);
   \end{scope}

\end{tikzpicture}
\end{document}

enter image description here

share|improve this answer
2  
Thanks. The problem with double is that then I get the colored line on both sides. –  student Oct 8 '12 at 16:13
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.