Graphics, Figures & Tables ⇒ tikZ | Custom Arrows (GOST)

[usr345]

There is a Russian standard for the constructor documentation (GOST), where the arrows are defined to be:

gost.png (1.33 KiB) Viewed 6029 times

But in tikZ arrows with such angle are missing. How can I make them?

[Stefan Kottwitz]

Hi,

the image is missing. Could you upload it again?

Stefan

[usr345]

Sorry, I tried to upload it to your server. But did something wrong.

Using my server now.

[localghost]

Sorry, I tried to upload it your server. But did something wrong.

Using my server now.

The GIF file format is not allowed. I converted the image to PNG and uploaded it to the forum server. This way the picture will always be available. External links can expire.


Thorsten

[localghost]

Since the »arrows« library of the pgf/tikZ package does not define such arrow tips, you have to do that by yourself. The idea is to borrow code from similar arrow types and modify them.

The code below defines the new arrow types "angle 20" and "triangle 20" along with their reversed counterparts.

Code: Select all

\documentclass{minimal}
\usepackage{tikz}
\usetikzlibrary{arrows}

\makeatletter
\pgfarrowsdeclare{angle 20}{angle 20}
{
  \pgfutil@tempdima=0.3pt%
  \advance\pgfutil@tempdima by.25\pgflinewidth%
  \pgfutil@tempdimb=7.29\pgfutil@tempdima\advance\pgfutil@tempdimb by.5\pgflinewidth%
  \pgfarrowsleftextend{+-\pgfutil@tempdimb}
  \pgfutil@tempdimb=.5\pgfutil@tempdima\advance\pgfutil@tempdimb by1.6\pgflinewidth%
  \pgfarrowsrightextend{+\pgfutil@tempdimb}
}
{
  \pgfutil@tempdima=0.3pt%
  \advance\pgfutil@tempdima by.25\pgflinewidth%
  \pgfsetdash{}{+0pt}
  \pgfsetroundcap
  \pgfsetmiterjoin
  \pgfpathmoveto{\pgfpointadd{\pgfqpoint{0.5\pgfutil@tempdima}{0pt}}{\pgfqpointpolar{167}{18\pgfutil@tempdima}}}
  \pgfpathlineto{\pgfqpoint{0.5\pgfutil@tempdima}{0pt}}
  \pgfpathlineto{\pgfpointadd{\pgfqpoint{0.5\pgfutil@tempdima}{0pt}}{\pgfqpointpolar{-167}{18\pgfutil@tempdima}}}
  \pgfusepathqstroke
}
\pgfarrowsdeclarereversed{angle 20 reversed}{angle 20 reversed}{angle 20}{angle 20}

\pgfarrowsdeclare{triangle 20}{triangle 20}
{
  \pgfutil@tempdima=0.5pt%
  \advance\pgfutil@tempdima by.25\pgflinewidth%
  \pgfutil@tempdimb=7.29\pgfutil@tempdima\advance\pgfutil@tempdimb by.5\pgflinewidth%
  \pgfarrowsleftextend{+-\pgfutil@tempdimb}
  \pgfutil@tempdimb=.5\pgfutil@tempdima\advance\pgfutil@tempdimb by1.6\pgflinewidth%
  \pgfarrowsrightextend{+\pgfutil@tempdimb}
}
{
  \pgfutil@tempdima=0.5pt%
  \advance\pgfutil@tempdima by.25\pgflinewidth%
  \pgfsetdash{}{+0pt}
  \pgfsetmiterjoin
  \pgfpathmoveto{\pgfpointadd{\pgfqpoint{0.5\pgfutil@tempdima}{0pt}}{\pgfqpointpolar{167}{12\pgfutil@tempdima}}}
  \pgfpathlineto{\pgfqpoint{0.5\pgfutil@tempdima}{0\pgfutil@tempdima}}
  \pgfpathlineto{\pgfpointadd{\pgfqpoint{0.5\pgfutil@tempdima}{0pt}}{\pgfqpointpolar{-167}{12\pgfutil@tempdima}}}
  \pgfpathclose
  \pgfusepathqfillstroke
}
\pgfarrowsdeclarereversed{triangle 20 reversed}{triangle 20 reversed}{triangle 20}{triangle 20}
\makeatother

\begin{document}
  \begin{tikzpicture}
    \draw[angle 20-angle 20] (0,0) -- (2,0);
    \draw[triangle 20-triangle 20] (0,0.5) -- (2,0.5);
  \end{tikzpicture}
\end{document}

This might need further adjustments. Whereas the "triangle 20" type looks good, I have the impression that the "angle 20" type is a bit distorted although I'm sure that I didn't modify parameters which could cause that. You may verify that with a printed document.


Thorsten

[usr345]

I have the impression that the "angle 20" type is a bit distorted although I'm sure that I didn't modify parameters which could cause that. You may verify that with a printed document.

I verified. It seems to be an optical illusion when you are looking with a little zoom. I zoomed to max: 6400% and it looks almost perfect.