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I'm having some problem creating a new function.

I found in another topic a method to create a watermark on pages, and to make my work easier, I created a function when called, inserts the watermark on my sheets. So far I have this code.

\usepackage{eso-pic}
\usepackage{rotating}
\usepackage{transparent}

\newcommand{\watermark}[1]{
    \AddToShipoutPicture{


    \put(0,0){

        \parbox[b][\paperheight]{\paperwidth}{
            \vfill
            \centering

            {\transparent{0.15}\fontsize{150pt}{1.5pt}\fontfamily{lmtt}\selectfont \begin{turn}{45} \textbf{#1}\end{turn}}
            \vfill}}}

}

However, I want to optimize this command even more, passing through the mandatory command the text to be displayed, and optional parameters the following data: "rotation, transparency and font size". But I don't know how to create a command with all these optional and mandatory parameters.

Thank you in advance.

Gabriel Tavore de Arruda
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    Why not using a specialized package such as draftwatermark? – egreg Feb 06 '22 at 10:28
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    (a) Different ways of defining a macro with parameters: https://tex.stackexchange.com/questions/266811/define-a-new-command-with-parameters-inside-newcommand (b) A key=value method is more powerful and flexible; the \newcommand method can have 9 parameters, only the first parameter can be optional (although nesting of \newcommands is possible) (c) In expl3, multiple optional parameters are allowed, but are positional, not named (although named parameters can be coded up in and out of expl3 (there was a TeX.se question about naming parameters so they could be typed in any order)). – Cicada Feb 07 '22 at 14:18
  • @egreg I created a new command with draftwatermark package too, but I have this same need. I tried with xwatermark package too, but this one didn't work. – Gabriel Tavore de Arruda Feb 07 '22 at 14:58
  • @Cicada Its exactly what I need. I found this post, wich explain how to create key=value method. https://tex.stackexchange.com/questions/34312/how-to-create-a-command-with-key-values. – Gabriel Tavore de Arruda Feb 07 '22 at 16:30
  • I suggest using CTAN eso-pic. – FHZ Mar 09 '22 at 18:10

1 Answers1

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Reading the answer of @Cicada and the link for me sent, I found what I really need. In this link I found a method to create the command with all the parameters. I got this:

\documentclass[a4paper]{article}
\usepackage{keyval}
\usepackage{eso-pic}
\usepackage{rotating}
\usepackage{transparent}

\makeatletter
\define@key{watermark}{fontsize}{\def\wm@fontsize{#1}}
\define@key{watermark}{transparency}{\def\wm@transparency{#1}}
\define@key{watermark}{align}{\def\wm@align{#1}}


\setkeys{watermark}{fontsize=100pt,transparency=0.15,align=45}%
\newcommand{\watermark}[2][]{
    \setkeys{watermark}{#1}
    \AddToShipoutPicture{
        \put(0,0){

            \parbox[b][\paperheight]{\paperwidth}{
                \vfill
                \centering

                {\transparent{\wm@transparency}\fontsize{\wm@fontsize}{1.5pt}\fontfamily{lmtt}\selectfont \begin{turn}{\wm@align} \textbf{#2}\end{turn}}
                \vfill}}}
}


\makeatother


\begin{document}
    \watermark{DRAFT}
\end{document}

Thank you very much for the attention.

Gabriel Tavore de Arruda
  • 45