public WktItem GetWktItem(string name)
{
WktItem item = null;
GetWktItem(name, this, ref item);
return(item);
}
public GeographicCoordSystem(WktItem wktItem)
{
_name = wktItem.Value.Split(',')[0].Replace("\"", string.Empty);
_angularUnit = new AngularUnit(wktItem.GetWktItem("UNIT"));
_primeMeridian = new PrimeMeridian(wktItem.GetWktItem("PRIMEM"));
_datum = new Datum(wktItem.GetWktItem("DATUM"));
_oracleSpatialSRID = int.MinValue;
}
private void GetWktItem(string name, WktItem beginWktItem, List <WktItem> items)
{
if (beginWktItem.Name.ToUpper() == name.ToUpper())
{
items.Add(beginWktItem);
}
if (beginWktItem.Items.Count > 0)
{
foreach (WktItem it in beginWktItem.Items)
{
GetWktItem(name, it, items);
}
}
}
//SPHEROID["WGS_1984",6378137.0,298.257223563]
public Spheroid(WktItem wktItem)
{
string[] vs = wktItem.Value.Split(',');
Name = vs[0].Replace("\"", string.Empty);
SemimajorAxis = double.Parse(vs[1]);
if (vs.Length == 3 || (vs.Length == 4 && vs[3] == string.Empty))
{
InverseFlattening = double.Parse(vs[2]);
}
else if (vs.Length == 4)
{
InverseFlattening = double.Parse(vs[3]);
}
}
private void GetWktItem(string name, WktItem beginWktItem, ref WktItem item)
{
if (beginWktItem.Name.ToUpper() == name.ToUpper())
{
item = beginWktItem;
return;
}
if (beginWktItem.Items.Count > 0)
{
foreach (WktItem it in beginWktItem.Items)
{
GetWktItem(name, it, ref item);
}
}
}
private NameMapItem GetPrjName(WktItem wktItem)
{
using (OGCWkt2Proj4Mapper map = new OGCWkt2Proj4Mapper())
{
string prjName = wktItem.Value.Split(',')[0].Replace("\"", string.Empty);
switch (_wktSource)
{
case enumWKTSource.EsriPrjFile:
return(map.GetPrjNameFromEsriName(prjName));
case enumWKTSource.GDAL:
return(map.GetPrjNameFromWKTName(prjName));
default:
return(map.GetPrjNameFromWKTName(prjName));
}
}
}
public WktItem Split(string wkt)
{
Stack <char> stack = new Stack <char>();
List <WktItem> subitems = new List <WktItem>();
bool hasLeft = false;
for (int i = 0; i < wkt.Length; i++)
{
stack.Push(wkt[i]);
if (wkt[i] == ']')
{
string str = null;
bool passLeft = false;
do
{
char c = stack.Pop();
if (c == '[')
{
passLeft = true;
}
str = c + str;
}while (!(stack.Count == 0 || (passLeft && stack.Peek() == ',')));
//
WktItem it = new WktItem(str);
if (!hasLeft)
{
it.Items.AddRange(subitems);
subitems.Clear();
}
subitems.Add(it);
hasLeft = false;
}
else if (wkt[i] == '[')
{
hasLeft = true;
}
}
if (subitems.Count == 0)
{
return(null);
}
return(subitems[0]);
}
/*
* 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);
}
public ISpatialReference Parse(string wkt)
{
_rootWktItem = new WktSpliter().Split(wkt); //2ms
if (_rootWktItem == null)
{
return(null);
}
bool isPrj = IsProjectionCoordSystem();
bool isGeo = IsGeographicCoordSystem();
if (!isPrj && !isGeo)
{
throw new Exception("本系统只支持地理坐标系统与投影坐标系统,坐标系统\"" + _rootWktItem.Name + "\"不受支持。");
}
IGeographicCoordSystem _geoCoordSystem = null;
IProjectionCoordSystem _prjCoordSystem = null;
_geoCoordSystem = ParseGeoCoordSystem(_rootWktItem.GetWktItem(cstGeoCoordSystem));
_prjCoordSystem = ParseProjectionCoordSystem(_rootWktItem.GetWktItem(cstPrjCoordSystem)); //8ms
return(new SpatialReference(_geoCoordSystem, _prjCoordSystem));
}
private NameValuePair[] GetPrjParameters(WktItem[] wktItems)
{
List <NameValuePair> values = new List <NameValuePair>();
using (OGCWkt2Proj4Mapper map = new OGCWkt2Proj4Mapper())
{
for (int i = 0; i < wktItems.Length; i++)
{
NameMapItem name = null;
WktItem witem = wktItems[i];
string[] vs = witem.Value.Split(',');
string pname = vs[0].Replace("\"", string.Empty);
double pvalue = double.Parse(vs[1]);
try
{
switch (_wktSource)
{
case enumWKTSource.EsriPrjFile:
name = map.GetParameterFromEsriName(pname);
break;
case enumWKTSource.GDAL:
name = map.GetParameterFromWKTName(pname);
break;
default:
name = map.GetParameterFromWKTName(pname);
break;
}
if (name != null)
{
values.Add(new NameValuePair(name, pvalue));
}
}
catch { continue; }
}
}
return(values.Count > 0 ? values.ToArray() : null);
}
public void Add(WktItem it)
{
Items.Add(it);
}
//DATUM["D_WGS_1984",
// SPHEROID["WGS_1984",6378137.0,298.257223563]
// ]
public Datum(WktItem wktItem)
{
Spheroid = new Spheroid(wktItem.GetWktItem("SPHEROID"));
Name = (wktItem.Value.Split(',')[0]).Replace("\"", string.Empty);
}
//UNIT["Degree",0.0174532925199433]
public AngularUnit(WktItem wktItem)
{
string[] vs = wktItem.Value.Split(',');
Name = vs[0].Replace("\"", string.Empty);
Value = double.Parse(vs[1]);
}
//PRIMEM["Greenwich",0.0]
public PrimeMeridian(WktItem wktItem)
{
string[] vs = wktItem.Value.Split(',');
Name = vs[0].Replace("\"", string.Empty);
Value = double.Parse(vs[1]);
}
protected IGeographicCoordSystem ParseGeoCoordSystem(WktItem wktItem)
{
return(new GeographicCoordSystem(wktItem));
}
protected abstract IProjectionCoordSystem ParseProjectionCoordSystem(WktItem wktItem);