GooCanvasEllipse represents an ellipse item.
It is a subclass of CanvasItemSimple and so inherits all of the style properties such as "stroke-color", "fill-color" and "line-width".
It also implements the CanvasItem interface, so you can use the CanvasItem functions such as raise and rotate.
To create a CanvasEllipse use CanvasEllipse.
To get or set the properties of an existing CanvasEllipse, use @get and @set.
The ellipse can be specified either with the "center-x", "center-y", "radius-x" and "radius-y" properties, or with the "x", "y", "width" and "height" properties.