common: figureSoundGraph: Use LaTeX conditionals

* src/common/figureAnalogSignalExample.tex: Use LaTeX conditionals to select the proper translation for the figure caption. * src/en/sections/music-and-technology-synthesis-sound.tex, src/ru/sections/music-and-technology-synthesis-sound.tex: Update.
artyom-poptsov · Jan 17, 2025 · 8f4b6a7 · 8f4b6a7
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diff --git a/src/common/figureSoundGraph.tex b/src/common/figureSoundGraph.tex
@@ -1,4 +1,19 @@
 \newcommand{\figureSoundGraph}[1]{
+  \def\lang{\detokenize{#1}}
+  \def\langRu{\detokenize{ru}}
+  \def\langEn{en}
+  \def\figureCaption{XXX: No translation.}
+  \def\figureUnit{$\mu\mbox{s}$}
+  \ifx \lang\langRu
+  \def\figureCaption{
+    Графическое отображение процесса генерации звука.
+  }
+  \fi
+  \if \lang\langEn
+  \def\figureCaption{
+    Graphical representation of the sound generation process.
+  }
+  \fi
   \begin{figure}[H]
     \begin{tikzpicture}
       \draw[thick, ->] (0, 0) -- (12, 0) node[anchor=north west] {t};
@@ -22,7 +37,7 @@
       \draw[thick, orange, <->] (0, -1.5)
       -- (10,  -1.5) node[midway, below, red] {t=?};
     \end{tikzpicture}
-    \caption{#1}
+    \caption{\figureCaption}
     \label{fig:sound-graph}
   \end{figure}
 }
diff --git a/src/en/sections/music-and-technology-synthesis-sound.tex b/src/en/sections/music-and-technology-synthesis-sound.tex
@@ -74,9 +74,7 @@ \section{Sound}
 divide 1 second (in microseconds) by the wavelength and by that we will get the
 frequency (in Hertz).  That's easy.
 
-\figureSoundGraph{
-  Graphical representation of the sound generation process.
-}
+\figureSoundGraph{en}
 
 The method of sound generation is similar to \gls{PWM}. The main difference is
 that now we must change the wavelength, keeping the duty cycle constant, equal

diff --git a/src/ru/sections/music-and-technology-synthesis-sound.tex b/src/ru/sections/music-and-technology-synthesis-sound.tex
@@ -75,9 +75,7 @@ \section{Звук}
 секунду (в микросекундах) на длину волны -- таким образом, получим частоту в
 Герцах. Всё просто.
 
-\figureSoundGraph{
-  Графическое отображение процесса генерации звука.
-}
+\figureSoundGraph{ru}
 
 Метод генерации звука похож на \gls{ШИМ}.  Основные отличия заключаются в том,
 что теперь мы должны изменять длину волны \texttt{len}, оставляя коэффициент