code: func (imd *IMDraw) Ellipse(radius pixel.Vec, thickness float64) {
  	if thickness == 0 {
  		imd.fillEllipseArc(radius, 0, 2*math.Pi)
  	} else {
  		imd.outlineEllipseArc(radius, 0, 2*math.Pi, thickness, false)
  	}
  }
docs: // Ellipse draws an ellipse of the specified radius in each axis around each Pushed points. If the
  // thickness is 0, the ellipse will be filled, otherwise an ellipse outline of the specified
  // thickness will be drawn.