public SvgCircleElement(SvgDocument document, SvgBaseElement parent, XElement circleElement)
: base(document, parent, circleElement)
{
XAttribute cx_attribute = circleElement.Attribute("cx");
if(cx_attribute != null)
CenterX = SvgCoordinate.Parse(cx_attribute.Value);
XAttribute cy_attribute = circleElement.Attribute("cy");
if(cy_attribute != null)
CenterY = SvgCoordinate.Parse(cy_attribute.Value);
XAttribute r_attribute = circleElement.Attribute("r");
if(r_attribute != null)
Radius = SvgLength.Parse(r_attribute.Value);
}