inclined line in the corner of a document

Question

How can I insert four inclined lines in the corner of page border?

Does someone have any experience in this field?

Answer 1

You can simply adapt my code from how to insert image on page at the bottom-left of a page. You just have to replace the \includegaphics code in these examples by either corresponding picture environment code or by TikZ code. For example:

\documentclass{article}
\usepackage{lipsum}
\usepackage{adjustbox}
\usepackage{xcolor}% color would also be sufficient
\usepackage{calc}% For not needing \dimexpr in my \put and \line commands.
\usepackage{scrlayer-scrpage}
\pagestyle{plain}
\DeclareNewLayer[%
  background,%
  mode=picture,%
  page,
  contents={%
    \color{red}\thicklines
    \put(0,\paperheight-5cm){\line(2,3){5cm2/3}}%
    \put(\paperwidth,\paperheight-5cm){\line(-2,3){5cm2/3}}%
    \put(0,5cm){\line(2,-3){5cm2/3}}%
    \put(\paperwidth,5cm){\line(-2,-3){5cm2/3}}%
  }%
]
{cornerimages}
\AddLayersToPageStyle{plain.scrheadings}{cornerimages}
\begin{document}
\lipsum
\end{document}

Would result in:

You can adapt all other examples in my answer by similar code. Alternatively you can adapt the TikZ answer to: Absolute positioning in beamer.