code: function strokePolygon(poly, fill) {
           if (fill === true) {
             this.fillPolygon(poly);
           } else {
             var len = poly.points.length,
                 points = this._glPoints,
                 i; // Grow internal points buffer if necessary
  
             for (i = points.length; i < len; i++) {
               points.push(new me.Vector2d());
             } // calculate and draw all segments
  
  
             for (i = 0; i < len; i++) {
               points[i].x = poly.pos.x + poly.points[i].x;
               points[i].y = poly.pos.y + poly.points[i].y;
             }
  
             this.compositor.drawLine(points, len);
           }
         }
docs: Stroke a me.Polygon on the screen with a specified color
  @name strokePolygon
  @memberOf me.WebGLRenderer.prototype
  @function
  @param {me.Polygon} poly the shape to draw