SVG.Poly = {
  // Set polygon data with default zero point if no data is passed
  plot: function(points) {
    this.attr('points', points || '0,0')
    
    return this
  }
}

SVG.Polyline = function() {
  this.constructor.call(this, SVG.create('polyline'))
}

// Inherit from SVG.Shape
SVG.Polyline.prototype = new SVG.Shape()

// Add polygon-specific functions
SVG.extend(SVG.Polyline, SVG.Poly)

SVG.Polygon = function() {
  this.constructor.call(this, SVG.create('polygon'))
}

// Inherit from SVG.Shape
SVG.Polygon.prototype = new SVG.Shape()

// Add polygon-specific functions
SVG.extend(SVG.Polygon, SVG.Poly)