public RadialGradientConverter()
{
var position = PointConverter.StartsWithKeyword(Keywords.At).Option(Point.Center);
var circle = WithOrder(WithAny(Assign(Keywords.Circle, true).Option(true),
LengthConverter.Option()),
position);
var ellipse = WithOrder(WithAny(Assign(Keywords.Ellipse, false).Option(false),
LengthOrPercentConverter.Many(2, 2).Option()),
position);
var extents = WithOrder(WithAny(Toggle(Keywords.Circle, Keywords.Ellipse).Option(false),
Map.RadialGradientSizeModes.ToConverter()), position);
_converter = circle.Or(ellipse.Or(extents));
}
