code: public RadarSeries setLineStyle(BasicStroke basicStroke) {
  
      stroke = basicStroke;
      if (this.lineWidth > 0.0f) {
        stroke =
            new BasicStroke(
                lineWidth,
                this.stroke.getEndCap(),
                this.stroke.getLineJoin(),
                this.stroke.getMiterLimit(),
                this.stroke.getDashArray(),
                this.stroke.getDashPhase());
      }
      return this;
    }
docs: Set the line style of the series
  
  @param basicStroke