michal-h21
commented
2 years ago For ordinary \includegraphics command, you can add alt text using the alt option, like \includegraphics[alt=hello]{hello.png}. With TikZ pictures, it is a bit more complicated.
First of all, you need the updated driver, where I just added the support for the alt text. Then, you need to pass the alt text from your command to the \Picture command used by TeX4ht. You already have the alternativetext environment, so you can use that:
%--8<-------------------------------------
\documentclass[10pt,a4paper]{memoir}
\usepackage[T1]{fontenc}
\usepackage{textcomp}
\usepackage[utf8]{inputenc}
\usepackage[italian]{babel}
\usepackage{graphicx}
\usepackage{tikz}
\RequirePackage[normalem]{ulem}
\NewDocumentCommand \immagine{s O{1} m m}{
% Macro for placing image with:
% - Alternative text,
% - scale (default value: 1),
% - centered without an asterisk, with asterisk does NOT center the image.
% Examples:
%% \immagine{}{}
%% \immagine{Alternative text}{\miaimmagine}
%% \immagine[.5]{Alternative text}{\miaimmagine}
%% \immagine*[.5]{Alternative text}{\miaimmagine}
%
\begin{alternativetext}{#3}
\IfBooleanF{#1}
{\begin{center}}
\scalebox{#2}{#4}
\IfBooleanF{#1}
{\end{center}}
\end{alternativetext}
}
\newenvironment{alternativetext}[1]{}{}
\newcommand{\pitagora}[2]{
\begin{tikzpicture}[x=5 mm, y=5 mm, smooth, line cap=round]
\filldraw [gray, fill=yellow]
(0, 0) -- (0, -#1) -- (+#1, -#1) -- (+#1, 0) -- cycle
(0, 0) -- (-#2, 0) -- (-#2, +#2) -- (0, +#2) -- cycle
(0, +#2) -- (+#2, +#1+#2) -- (+#1+#2, +#1) --
(+#1, 0) -- cycle;
\draw [very thick, pink!70!black]
(0, 0) -- (#1, 0) -- (0, #2) -- cycle;
\end{tikzpicture}
}
\begin{document}
There are a simple way to set alt tag for images?
\immagine{Pythagorean theorem}{\pitagora{4}{3}}
\end{document}
%--8<-------------------------------------
You can then use the configuration file to redefine the environment to pass the alt text:
\Preamble{xhtml}
\renewenvironment{alternativetext}[1]{\Configure{Picture-alt}{#1}}{}
\begin{document}
\EndPreamble
danielezambelli
Hi michal-h21,
there are a simple way to set alt tag for images?
Thanks.