private IProjectionCoordSystem GetPrjCoordSystemByProj4(Dictionary <string, string> nameValuePairs)
{
string coordType = nameValuePairs["proj"];
if (coordType == "latlong")
{
return(null);
}
List <NameMapItem> args = _prjStdsMapTableParser.GetPrjParameterItems();
if (args == null)
{
return(null);
}
ProjectionCoordSystem prj = new ProjectionCoordSystem();
prj.Name = _prjStdsMapTableParser.GetPrjNameItemByPrj4(coordType);
List <NameValuePair> paras = new List <NameValuePair>();
foreach (NameMapItem arg in args)
{
if (nameValuePairs.ContainsKey(arg.Proj4Name))
{
paras.Add(new NameValuePair(_prjStdsMapTableParser.GetPrjParamterItemByPrj4(arg.Proj4Name), double.Parse(nameValuePairs[arg.Proj4Name])));
}
}
prj.Parameters = paras.Count > 0 ? paras.ToArray() : null;
return(prj);
}
public object Clone()
{
ProjectionCoordSystem prj = new ProjectionCoordSystem();
if (_name != null)
{
prj._name = _name.Clone() as NameMapItem;
}
if (_parameters != null && _parameters.Length > 0)
{
prj._parameters = CloneParameters();
}
if (_unit != null)
{
prj._unit = _unit.Clone() as AngularUnit;
}
return(prj);
}
/*
* PROJECTION["Mercator"],
* PARAMETER["False_Easting",0.0],
* PARAMETER["False_Northing",0.0],
* PARAMETER["Central_Meridian",0.0],
* PARAMETER["Standard_Parallel_1",0.0],
* UNIT["Meter",1.0]
*/
protected override IProjectionCoordSystem ParseProjectionCoordSystem(WktItem wktItem)
{
if (wktItem == null)//Is Graphics Coordinate System
{
return(null);
}
string name = wktItem.Value.Split(',')[0].Replace("\"", string.Empty);
NameMapItem prjName = GetPrjName(wktItem.GetWktItem("PROJECTION")); //5ms
if (prjName == null)
{
throw new Exception("投影坐标系统\"" + name + "\"没有在系统中预先配置。");
}
NameValuePair[] parameters = GetPrjParameters(wktItem.GetWktItems("PARAMETER"));
AngularUnit unit = new AngularUnit(wktItem.GetWktItem("UNIT"));
ProjectionCoordSystem prj = new ProjectionCoordSystem(prjName, parameters, unit);
prj.NameDes = name;
return(prj);
}
