code: function strokeArc(x, y, radius, start, end, antiClockwise, fill) {
           var context = this.backBufferContext2D;
  
           if (context.globalAlpha < 1 / 255) {
             // Fast path: don't draw fully transparent
             return;
           }
  
           this.translate(x + radius, y + radius);
           context.beginPath();
           context.arc(0, 0, radius, start, end, antiClockwise || false);
           context[fill === true ? "fill" : "stroke"]();
           context.closePath();
           this.translate(-(x + radius), -(y + radius));
         }
docs: Stroke an arc at the specified coordinates with given radius, start and end points
  @name strokeArc
  @memberOf me.CanvasRenderer.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