aframe-lsystem-component/worker.js

L-System/LSystem component for A-Frame to draw 3D turtle graphics. Using Lindenmayer as backend.

// Require instead of importScripts because we use webpack
// with worker-loader for compiling source: https://github.com/webpack/worker-loader
import LSystem from 'lindenmayer';
let lsystem = new LSystem({});
let timeout = {};

onmessage = function(e) {
  // wait a few ms to start thread, to be able to cancel old tasks
  clearTimeout(timeout);
  timeout = setTimeout(function() {
    
    lsystem.setAxiom(e.data.axiom);
      
    lsystem.clearProductions();
    for (let p of e.data.productions) {
      lsystem.setProduction(p[0], p[1]);
    }
    lsystem.iterate(e.data.iterations);
      
    postMessage({
      result: lsystem.getString(),
      initial: e.data
    });
      
  }, 20);

};