code: func (f *Fpdf) Ellipse(x, y, rx, ry, degRotate float64, styleStr string) {
  	f.arc(x, y, rx, ry, degRotate, 0, 360, styleStr, false)
  }
docs: // Ellipse draws an ellipse centered at point (x, y). rx and ry specify its
  // horizontal and vertical radii.
  //
  // degRotate specifies the counter-clockwise angle in degrees that the ellipse
  // will be rotated.
  //
  // styleStr can be "F" for filled, "D" for outlined only, or "DF" or "FD" for
  // outlined and filled. An empty string will be replaced with "D". Drawing uses
  // the current draw color and line width centered on the ellipse's perimeter.
  // Filling uses the current fill color.
  //
  // The Circle() example demonstrates this method.