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org-mode中使用tikz绘图

原理

由于 divpng 不支持 tikz，因此我们需要借助 imagemagick 将 tikz 生成的 pdf 文件转换为图片文件。

安装imagemagick

*nix系统可通过包管理软件安装：

brew install imagemagick

配置

修改 org-mode 中 latex 的图片生成软件为 imagemagick ，这里以 doom emacs 为例：

(after! org
  :config
  (setq org-preview-latex-default-process 'imagemagick)
  (setq org-latex-packages-alist
          '(("" "newpxtext,newpxmath" t)
            ("" "tikz" t)
            ("" "tikz-cd" t)
            ("" "eulervm" t)))
  (setq org-format-latex-options (plist-put org-format-latex-options :scale 1.6))
  (with-eval-after-load "preview"
      (add-to-list 'preview-default-preamble "\\PreviewEnvironment{tikzpicture}" t)))

使用

在 org 文件头添加以下配置 ：

#+LATEX_HEADER: \usepackage{tikz} \usepackage{pgf -umlcd} \usepgflibrary{arrows} \usepackage{color}
#+PROPERTY: header-args:latex :headers '("\\usepackage{tikz}") :fit yes :imagemagick yes :iminoptions -density 300 :imoutoptions
#+OPTIONS: tex:imagemagick

完成以上步骤，便可以在 latex 代码块中调用 org-latex-preview 方法预览 tikz 绘制的图片了（快捷键 C-c C-x C-l ）。

\begin{tikzpicture}
    \foreach \n in {0,...,8} {
      \pgfmathsetmacro{\x}{mod(\n,3)+.5}
      \pgfmathsetmacro{\y}{2.5-div(\n,3)}
      \pgfmathsetmacro{\m}{int(\n+1)}
      \pgfmathsetmacro{\c}{mod(\n,2) ? "red!40" : "gray!70"}
      \fill[\c] (\x-.5,\y-.5) rectangle (\x+.5,\y+.5);
      \node at (\x, \y) {\m};
    }
    \draw (0,0) grid (3,3);
  \end{tikzpicture}

参考

LaTeX Source Code Blocks in Org Mode

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