code: function strokeArc(x, y, radius, start, end, antiClockwise, fill) {
           if (fill === true) {
             this.fillArc(x, y, radius, start, end, antiClockwise);
           } else {
             console.warn("strokeArc() is not implemented");
           }
         }
docs: Stroke an arc at the specified coordinates with given radius, start and end points
  @name strokeArc
  @memberOf me.WebGLRenderer.prototype
  @function
  @param {Number} x arc center point x-axis
  @param {Number} y arc center point y-axis
  @param {Number} radius
  @param {Number} start start angle in radians
  @param {Number} end end angle in radians
  @param {Boolean} [antiClockwise=false] draw arc anti-clockwise