code: function (options) {
  
      var
        context     = options.context,
        lineWidth   = options.lineWidth,
        shadowSize  = options.shadowSize,
        offset;
  
      context.save();
      context.lineJoin = 'round';
  
      if (shadowSize) {
  
        context.lineWidth = shadowSize / 2;
        offset = lineWidth / 2 + context.lineWidth / 2;
        
        // @TODO do this instead with a linear gradient
        context.strokeStyle = "rgba(0,0,0,0.1)";
        this.plot(options, offset + shadowSize / 2, false);
  
        context.strokeStyle = "rgba(0,0,0,0.2)";
        this.plot(options, offset, false);
      }
  
      context.lineWidth = lineWidth;
      context.strokeStyle = options.color;
  
      this.plot(options, 0, true);
  
      context.restore();
    }
docs: Draws lines series in the canvas element.
  @param {Object} options