docs: function (x, y, radius, startAngle, endAngle, anticlockwise, addToPath) {
      if (anticlockwise === undefined) anticlockwise = false;
      if (addToPath === undefined) addToPath = false;
      if (!addToPath) this.context.beginPath();
      this.context.arc(x, y, radius, startAngle, endAngle, anticlockwise);
    }