Markdown-it-latex2img

0 Background

0.1 Related

• markdown-it-math:
  It was originally designed to render MathML.
• markdown-it-mathjax:
  Just to bypass LaTeX math for mathjax processing, need to import mathjax
• markdown-it-katex:
  Need to include the KaTeX stylesheet

0.2 Demand

• Place LaTeX Math equation on anywhere
• Accurate and fast, supports rendering of diverse formulas

1 Feature

• Convert Latex syntax to image tags
• Support inline and block formulas
• Rendering results support multi-end use, such as WeChat Mini Program

2 Sample

Demo

3 Install

3.1 Node.js:

npm install markdown-it-latex2img --save

3.2 Browser (CDN):

• jsDeliver CDN

4 Usage

4.1 Node.js

const md = require('markdown-it')()
            .use(require('markdown-it-latex2img'));
md.render(`$\\frac {a+1}{b+2}$`) //JavaScript strings require double backslashes, but HTML input and reading files are not required

4.2 Browser

Differences in browser. If you load script directly into the page, without package system, module will add itself globally as window.markdownitLatex2img.

4.3 Hexo

WARNING: No front-end scripts and other Math plugins are required. Remove them ALL before using this plugin.Please use official plugin hexo-renderer-markdown-it(plus) as Renderer.

1. Install

npm i hexo-renderer-markdown-it --save
npm i markdown-it-latex2img --save

2. Config

# _config.yml
markdown:
  plugins:
    - markdown-it-latex2img

Default will load mathjax plugin EVERY PAGE during rendering,Does not reduce page speed after generated.Later will support on-demand rendering to improve rendering speed

5 Options(optional)

Property	Type	Default	Required	Remarks
server	String	https://math.now.sh	true	?from=block/inline=inline
style	String		false	commonly use filter: opacity(75%);transform:scale(0.75);text-align:center; to fit the body font color and size

If you want to customize options in hexo,please do as follows:

# _config.yml
markdown:
  plugins:
    - name: markdown-it-latex2img
      options:
        style: 'filter: opacity(90%);transform:scale(0.85);text-align:center;'

6 Convention

Markup is based on pandoc definition.
Mathjax pointed out

The default math delimiters are $$...$$ and [...] for displayed mathematics, and (...) for in-line mathematics.Note in particular that the \(...\) in-line delimiters are not used by default.That is because dollar signs appear too often in non-mathematical settings, which could cause some text to be treated as mathematics unexpectedly.

However,most still use \(...\), we have followed this habit.

# inline
$\frac {a+1}{b+2}$ # The opening $ must have a non-space character immediately to its right, while the closing $ must have a non-space character immediately to its left, and must not be followed immediately by a digit. 

# block
$$
{
e^x=\lim_{n\to\infty} \left( 1+\frac{x}{n} \right)^n
\qquad (2) 
}
$$

7 Dependencies

• uetchy/math-api

8 Case

• Hexo blog

9 License

MIT © MakerGYT