text: const Drawing = require('./../src/Drawing');
  const fs = require('fs');
  
  let d = new Drawing();
  
  d.addLayer('l_green', Drawing.ACI.GREEN, 'CONTINUOUS');
  d.setActiveLayer('l_green');
  
  d.drawLine(50, 50, 100, 100)
   .drawLine(100, 100, 150, 50)
   .drawLine(150, 50, 100, 0)
   .drawLine(100, 0, 50, 50)
  
  fs.writeFileSync(__filename + '.dxf', d.toDxfString());