ConTeXt：如何绕过 setuphead 中的 12pt setupbodyfont 限制

Question

根据12pt​\setupbodyfont​语境花园。

我们可以绕过这个内容上的限制，这样效果会很好：

\starttext
  \startbuffer[line]
  The quick brown fox jumps over the lazy dog
  \stopbuffer

  \switchtobodyfont[chorus, 12pt] chorus 12pt: \getbuffer[line] \\
  \switchtobodyfont[chorus, 13pt] chorus 13pt: \getbuffer[line] \\
  \switchtobodyfont[chorus, 14pt] chorus 14pt: \getbuffer[line] \\
  \switchtobodyfont[chorus, 15pt] chorus 15pt: \getbuffer[line] \\
  \switchtobodyfont[chorus, 20pt] chorus 20pt: \getbuffer[line] \\
  \switchtobodyfont[chorus, 32pt] chorus 32pt: \getbuffer[line]
\stoptext

不幸的是，它似乎不能很好地工作，无论textcommand是textstyle在\setuphead：

\setuphead[chapter][textcommand={\switchtobodyfont[chorus,12pt]}]

\starttext
  \chapter{The quick brown fox jumps over the lazy dog}
\stoptext

\setuphead[chapter][textcommand={\switchtobodyfont[chorus,13pt]}]

\starttext
  \chapter{The quick brown fox jumps over the lazy dog}
\stoptext

我怎样才能让它工作？

Answer 1

使用textstyle。据我所知，最好也定义适当的bodyfontenvironment

\definebodyfontenvironment [20pt]
\setuphead [chapter] [textstyle={\switchtobodyfont[chorus,20pt]}]

\starttext
\startchapter[title={The quick brown fox jumps over the lazy dog}]
\stopchapter
\stoptext