TiKZ 文本装饰中的字母间距

Question

我画了一个圆圈，上面有一些沿着曲线的文字，如下所示：

\documentclass[border=2mm]{standalone}
\usepackage{tikz}
\usepackage{fontspec}

\usetikzlibrary{decorations.text}

\setmainfont{Times New Roman}

\begin{document}

    \fontspec{Times New Roman}
    \addfontfeature{LetterSpace=50.0}

    \begin{tikzpicture}

        \draw [
                thick,
                   postaction={
                        decorate,
                        decoration={
                              raise=-4.5ex,
                              text along path, 
                              reverse path,
                              text align={left},
                              text={A bunch of text}
                        }
                   },
                ] (0,0) circle (3.5cm);

    \end{tikzpicture}


\end{document}

显然，我想要的是扩大字母之间的间距，但 TiKZ 似乎将每个单词视为一个字母，并增加了单词之间的间距。在这种情况下，有没有办法获得字母间距？如果有，那是什么？

Answer 1

decoration该键有两个文本对齐选项，TikZ允许将文本调整到路径。fit to path通过调整字符之间的间距来装饰路径。fit to path stretching spaces通过增加单词之间的间距来装饰路径。

MWE 提供了这两个选项的说明，第一个示例使用fit to path，第二个示例使用fit to path stretching spaces。第三个示例演示了如何沿路径格式化文本。有关详细信息，请参阅 MWE 中的注释。

这是输出：

这是 MWE，必须使用XeLaTex或编译，LuaLaTex因为fontspec已加载才能使用Time New Roman字体：

% !TeX program = xelatex 
\documentclass[border=2mm]{standalone}
\usepackage{tikz}
\usepackage{fontspec}
\usetikzlibrary{decorations.text}
\setmainfont{Times New Roman}

\begin{document}

    \fontspec{Times New Roman}
%    \addfontfeature{LetterSpace=50.0} <- Not applicable here

    \begin{tikzpicture}

        \draw [ rotate=145, % <- add rotation to get "A" at the top
                thick,
                   postaction={
                        decorate,
                        decoration={
                              raise=-4.5ex,
                              text along path, 
                              reverse path,
                              text align=fit to path, % <- spaces added between each character
                              text={ {\qquad} %<- Creates space between the first and last letter
                                   A bunch of text
                                   }
                        }
                   },
                ] (0,0) circle (3.5cm);
    \end{tikzpicture}%
    \begin{tikzpicture}
        \draw [ rotate=180,
                thick,
                postaction={
                    decorate,
                    decoration={
                        raise=-4.5ex,
                        text along path, 
                        reverse path,
                        text align=fit to path stretching spaces, % <- spaces between words increased
                        text={ {\qquad}
                             A bunch of text
                             }
                    }
                },
        ] (0,0) circle (3.5cm);        
    \end{tikzpicture}%
    \begin{tikzpicture}
        \draw [ rotate=180,
            thick,
            postaction={
            decorate,
            decoration={
                raise=-4.5ex,
                text along path, 
                reverse path,
                text align=fit to path,
                text={ {\qquad} % <- enclose macro in {}
                    |\Large\color{blue}| % <- Define the formatting of the text enclosed by |
                    A bunch 
                    |\LARGE\bfseries\color{red}| % <- Change the formatting 
                    of text
                }
            }
        },
    ] (0,0) circle (3.5cm);        
    \end{tikzpicture}

\end{document}