/// <summary>
/// Converts an object into its XML representation.
/// </summary>
/// <param name="writer">The <see cref="T:System.Xml.XmlWriter"/> stream to which the object is serialized.</param>
public void WriteXml(XmlWriter writer)
{
/* The GML specification defines an ellipsoid as follows:
*
* <gml:Ellipsoid gml:id="ogrcrs44">
* <gml:ellipsoidName>GRS 1980</gml:ellipsoidName>
* <gml:ellipsoidID>
* <gml:name gml:codeSpace="urn:ogc:def:ellipsoid:EPSG::">7019</gml:name>
* </gml:ellipsoidID>
* <gml:semiMajorAxis gml:uom="urn:ogc:def:uom:EPSG::9001">6378137</gml:semiMajorAxis>
* <gml:secondDefiningParameter>
* <gml:inverseFlattening gml:uom="urn:ogc:def:uom:EPSG::9201">298.257222101</gml:inverseFlattening>
* </gml:secondDefiningParameter>
* </gml:Ellipsoid>
*
*/
writer.WriteStartElement(Xml.GML_XML_PREFIX, "Ellipsoid", Xml.GML_XML_NAMESPACE);
writer.WriteElementString(Xml.GML_XML_PREFIX, "ellipsoidName", Xml.GML_XML_NAMESPACE, _name);
writer.WriteStartElement(Xml.GML_XML_PREFIX, "ellipsoidID", Xml.GML_XML_NAMESPACE);
writer.WriteString(_epsgNumber.ToString());
writer.WriteEndElement();
writer.WriteStartElement(Xml.GML_XML_PREFIX, "semiMajorAxis", Xml.GML_XML_NAMESPACE);
writer.WriteString(SemiMajorAxis.ToMeters().Value.ToString("G17"));
writer.WriteEndElement();
writer.WriteStartElement(Xml.GML_XML_PREFIX, "semiMinorAxis", Xml.GML_XML_NAMESPACE);
writer.WriteString(SemiMinorAxis.ToMeters().Value.ToString("G17"));
writer.WriteEndElement();
writer.WriteStartElement(Xml.GML_XML_PREFIX, "secondDefiningParameter", Xml.GML_XML_NAMESPACE);
writer.WriteElementString(Xml.GML_XML_PREFIX, "inverseFlattening", Xml.GML_XML_NAMESPACE, InverseFlattening.ToString("G17"));
writer.WriteEndElement();
writer.WriteEndElement();
SanityCheck();
Calculate();
}
/// <summary>
/// 返回哈希代码。
/// </summary>
/// <returns></returns>
public override int GetHashCode()
{
return(SemiMajorAxis.GetHashCode() * 13 + SemiMinorAxis.GetHashCode() * 5);
}
