docs: def createPolygon(self, points, strokewidth=1, stroke='black', fill='none'):
          """
          Creates a Polygon
          @type  points: string in the form "x1,y1 x2,y2 x3,y3"
          @param points:  all points relevant to the polygon
          @type  strokewidth: string or int
          @param strokewidth:  width of the pen used to draw
          @type  stroke: string (either css constants like "black" or numerical values like "#FFFFFF")
          @param stroke:  color with which to draw the outer limits
          @type  fill: string (either css constants like "black" or numerical values like "#FFFFFF")
          @param fill:  color with which to fill the element (default: no filling)
          @return:  a polygon object
          """
          style_dict = {'fill':fill, 'stroke-width':strokewidth, 'stroke':stroke}
          myStyle = StyleBuilder(style_dict)
          p = Polygon(points=points)
          p.set_style(myStyle.getStyle())
          return p