An example module for wrapping PNG generation around mathjax-node

png-sv2png.js

var mjAPI = require("../lib/main.js");
var svg2png = require('svg2png');

function createPNG(result, callback){
  var sourceBuffer = new Buffer(result.svg, "utf-8");
  svg2png(sourceBuffer).then(function(buffer){
    result.png = "data:image/png;base64," + buffer.toString('base64');
    return callback(result);
  })
};

exports.math2png = function(options, callback){
  var mjConfig = Object.assign({}, options.config);
  console.log("**Note**: options.config can only be assigned once");
  var typesetOptions = Object.assign({}, options.typeset);

  // make sure SVG output will be generated and disable mml and html
  typesetOptions.svg = true;
  typesetOptions.mml = false;
  typesetOptions.html = false;
  mjAPI.config(mjConfig);
  mjAPI.typeset(typesetOptions, function(result){
    if (result.errors) callback(result);
    createPNG(result, callback);
  });
}

// Usage: 
// 
// var math2png = require("math2png.js").math2png;
// var options = {
//   config: {
//   },
//   typeset: {
//     math: "x^2",
//     format: "TeX"
//   }
// }
// math2png(options, function(result){
//   console.log(result.png);
//   console.log("style='" + result.style + "width:" + result.width + "; height:" + result.height +";'");
// });