How to draw for instance a beam (or even fancier forms) from a given center line? Here is what i mean but with a rather not so good solution. I would like to add pattern, etc.



% grid to see the coordinates

% Point A with circle and label
\coordinate [label={[label distance=3mm]below:A}] (A) at (1,3);

% Point B with circle and label
\coordinate [label={[label distance=3mm]right:B}](B) at (6,6);

% Point C with circle and label
\coordinate [label={[label distance=3mm]below:C}](C) at (7,4);

% Point D with circle and label
\coordinate [label={[label distance=3mm]right:D}](D) at (9,4);
\draw (D) circle [radius=3pt];

\draw[line width=20pt,line cap=round] (A) -- (B) -- (C) -- (D); 
\draw[line width=14pt,white,line cap=round] (A) -- (B) -- (C) -- (D);    
\draw (A) -- (B) -- (C) -- (D);

% grid to see the coordinates
\draw[help lines, step=1] (0,0) grid (10,8);

\draw (A) circle [radius=3pt];
\draw (B) circle [radius=3pt];
\draw (C) circle [radius=3pt];
\draw (D) circle [radius=3pt];


enter image description here

  • Do you mean TikZ decorations? Have a look at chapter 24 of the current TikZ/PGF documentation. – Turion Jan 7 '15 at 22:25
  • i know about the decoration library and i will look at this library. but from the idea: i want a knew path around the given skeleton line and than make fancy things (decorations) to this new path. – Nik Jan 9 '15 at 14:34

You can adapt my previous answer like this:

  rect/.style= { to path={ let \n1={sqrt(2)*#1},
    \p1=($(\tikztostart)!\n1!-135:(\tikztotarget)$), \p2=($(\tikztostart)!\n1!135:(\tikztotarget)$),
    \p3=($(\tikztotarget)!\n1!-135:(\tikztostart)$), \p4=($(\tikztotarget)!\n1!135:(\tikztostart)$)
    in (\p1) -- (\p2) -- (\p3) -- (\p4) --cycle (\tikztotarget)}
  round/.style={rounded corners=#1,rect/.default=#1}
    \draw[help lines] (0,0) grid (7,5);

    \def\mypath{(1,2) foreach \a in {30,-45,0,90} {to[rect] ++(\a:2)}}
    \fill[round=4mm,black] \mypath;
    \shade[round=3mm,left color=red, right color=blue] \mypath;
    \pattern[round=3mm,pattern color=white,pattern=bricks] \mypath;


enter image description here

  • that ist what I had in mind. i will later explore your code. but can i ask you to make a picture with everywhere rounded corners? to get the body of a snake :-) ? – Nik Jan 9 '15 at 14:30
  • @Nik probably you want another patern too, but I'll let you do this by yourself. Putting a circle is not so hard ;) – Kpym Jan 9 '15 at 14:53
  • Kpym ok ok ok ok – Nik Jan 9 '15 at 16:21
  • i want to write: @Kpym but i don't get this. not at the beginning of the comment. – Nik Jan 9 '15 at 16:24
  • You don't need @ for the author of the answer/question. It is automaticaly informed. You can add only one @ to informe somebody else too. Here for more info : meta.stackexchange.com/a/43020 – Kpym Jan 9 '15 at 16:38

Use pgf-blur. The documentation says that the shadow is always black. But it is not hard to find out that black and replace it by our \blurcolor

    /tikz/render blur shadow/.code={
        \path[blur shadow,shadow xshift=0,shadow yshift=0,
              shadow blur radius=20pt,shadow opacity=100,shadow blur steps=100]
  • @Nik when you like one answer, a good practice is to upvote it. – Kpym Jan 9 '15 at 14:54
  • sorry. done. ok i get this @ here but not at the beginning of the comment? – Nik Jan 9 '15 at 16:22

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