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Fontspec 倾斜单位

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Fontspec 倾斜单位

我一直在测试FakeSlant该软件包的功能fontspec。我有一个问题。软件包文档没有明确说明FakeSlant=#key=value 参数的单位。根据测试，我猜测单位是 1/100 度，但老实说，我对此没有信心。

\setmainfont{Source Serif 4}[%Available for free on Google Fonts.
    Kerning=On%
    ,SlantedFont={Source Serif 4}
        ,SlantedFeatures={%
            Kerning=On%
            ,FakeSlant=0.18
            }
]

编辑：做了一些测试。看起来该FakeSlant参数接受从-1到的值1，但我仍然不确定这些值的确切含义。

答案1

也许我错了，但倾斜值似乎是倾斜角度的切线。也就是说，如果字体轴倾斜X度（0 度表示直立），倾斜值为 tan(X)。因此，倾斜值 1 表示倾斜角度为 45 度（而倾斜值 -1 表示倾斜角度为 -45 度）。

比较：

\documentclass[tikz]{standalone}
\usepackage{fontspec}
\setmainfont{Noto Serif}

\begin{document}
\begin{tikzpicture}

    \draw[red] (45:-0.5) -- (45:1);
    \node at (45:0.5) 
        % tan(45deg) = 1
        {\addfontfeature{FakeSlant=1}I};

    % subtraction from 90 degrees in order to make 0 degrees match upright
    \draw[yellow] ({90-20}:-0.5) -- ({90-20}:1);
    \node at ({90-20}:0.5) 
        % tan(20deg) = 0.36397
        {\addfontfeature{FakeSlant=0.36397}I};

    \draw[blue] ({90-5}:-0.5) -- ({90-5}:1);
    \node at ({90-5}:0) 
        % tan(5deg) = 0.08749
        {\addfontfeature{FakeSlant=0.08749}I};
        
\end{tikzpicture}
\end{document}

在此处输入图片描述

答案2

使用cmpdfliteral：

pdfliteral

平均能量损失

pdftex

\protected\def\rbox#1{%
  \setbox0\hbox{{#1}}%
  \setbox2\hbox{%
  \special{pdf:literal q}%
  \special{pdf:literal -1 0 0 1 0 0 cm}\rlap{\copy0}
\special{pdf:literal Q}}%
    \hbox to --1\wd0{\kern--1\wd0\box2\hss}%
}

\rbox{abc $\mapsto $ xyz}

Text text text, $abc\mathbin{\rbox{ $\mapsto$}}xyz$, text text text.
% note the space: >>\rbox{ $<<

\protected\def\rbox#1{%
  \setbox0\hbox{{#1}}%
  \setbox2\hbox{%
  \special{pdf:literal q}%
  \special{pdf:literal -1 0 -0.2 1 0 0 cm}\rlap{\copy0}
\special{pdf:literal Q}}%
    \hbox to --1\wd0{\kern--1\wd0\box2\hss}%
}

\rbox{abc $\mapsto $ xyz}


\protected\def\rbox#1{%
  \setbox0\hbox{{#1}}%
  \setbox2\hbox{%
  \special{pdf:literal q}%
  \special{pdf:literal -1 1 -0.2 4 0 -50 cm}\rlap{\copy0}
\special{pdf:literal Q}}%
    \hbox to --1\wd0{\kern--1\wd0\box2\hss}%
}

\rbox{abc $\mapsto $ xyz}


\bye

实质性代码改编自在 Plain TeX/XeTeX 中缩放文本（\scalebox）使其变窄通过 左 \mapsto 箭头

某些参考示例可能会有用：

例子

平均能量损失

pdftex


   \vskip2ex%
   
\protected\def\rbox#1{%
  #1: %
  \setbox0\hbox{{abc}}%
  \setbox2\hbox{%
  \special{pdf:literal q}%
  \special{pdf:literal #1 cm}\rlap{\copy0}%
  \special{pdf:literal Q}%
}%
\hbox to --1\wd0{\kern1\wd0\box2\hss}%
\vrule
   \vskip1ex%
   }

no change: \rbox{1 0 0 1 0 0 }

translate: \rbox{1 0 0 1 50 35 }

scaling: \rbox{2 0 0 0.5 0 0 }

scaling: \rbox{0.5 0 0 2 0 0 }

reflection: \rbox{1 0 0 -1 0 0 }

reflection: \rbox{-1 0 0 -1 0 0 }

reflection: \rbox{-1 0 0 1 0 0 }

skew: \rbox{1 0.5 0 1 0 0 }

skew: \rbox{1 0 0.5 1 0 0 }

skew: \rbox{1 0 -0.5 1 0 0 }

skew: \rbox{1 -0.5 -0.5 1 0 0 } % 1 tan-x tan-y 1 0 0 

\vskip1ex
rotation: \rbox{1 1 -1 1 0 0 }

rotation: \rbox{-1 -1 1 -1 0 0 }

\vskip1ex
rotation: \rbox{0.86 0.5 -0.5 0.86 0 0 }%cos30 sin30 -sin30 cos30

\vskip1ex
rotation: \rbox{0.98 0.21 -0.21 0.98 0 0 } % -12 degrees

\protected\def\rboxc{%
  \setbox0\hbox{{abc}}%
  \setbox2\hbox{%
  \special{pdf:literal q}%
  \special{pdf:literal 2 0 0 2 0 0 cm}%scale
  \special{pdf:literal 1 0 -0.5 1 0 0 cm}%skew
  \special{pdf:literal 0.86 0.5 -0.5 0.86 0 0  cm}%rotate
  \special{pdf:literal -1 0 0 1 0 0 cm}{\copy0}%reflect
  \special{pdf:literal Q}%
  }%
\hbox to --1\wd0{\kern1\wd0\box2\hss}%
\vrule
   \vskip1ex%
   }

combined:


\rboxc


\bye

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