/// <summary>
/// create a crazy coordinate system
/// </summary>
/// <returns></returns>
private ISpatialReference CreateGeographicSpatialReference()
{
ISpatialReferenceFactory spatialRefFatcory = new SpatialReferenceEnvironmentClass();
IGeographicCoordinateSystem geoCoordSys;
geoCoordSys = spatialRefFatcory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984);
//assign a user defined datum to the SR (just for the test)
IDatum datum = new DatumClass();
IDatumEdit datumEdit = (IDatumEdit)datum;
ISpheroid spheroid = spatialRefFatcory.CreateSpheroid((int)esriSRSpheroidType.esriSRSpheroid_Clarke1880);
datumEdit.DefineEx("MyDatum", "My Datum", "MDTM", "", spheroid);
IPrimeMeridian primeMeridian = spatialRefFatcory.CreatePrimeMeridian((int)esriSRPrimeMType.esriSRPrimeM_Greenwich);
IAngularUnit angularUnits = spatialRefFatcory.CreateUnit((int)esriSRUnitType.esriSRUnit_Degree) as IAngularUnit;
IGeographicCoordinateSystemEdit geoCoordSysEdit = (IGeographicCoordinateSystemEdit)geoCoordSys;
geoCoordSysEdit.DefineEx("MyGeoCoordSys", "MyGeoCoordSys", "MGCS", "", "", datum, primeMeridian, angularUnits);
geoCoordSys.SetFalseOriginAndUnits(-180.0, -180.0, 5000000.0);
geoCoordSys.SetZFalseOriginAndUnits(0.0, 100000.0);
geoCoordSys.SetMFalseOriginAndUnits(0.0, 100000.0);
return(geoCoordSys as ISpatialReference);
}
public IGeographicCoordinateSystem GetSpatialRefrence()
{
double num;
if (this.int_0 > 0)
{
MessageBox.Show("请检查输入数据是否正确！");
return(null);
}
if (this.textEditName.Text.Length == 0)
{
MessageBox.Show("未指定名字，必须为坐标系统指定一个名字！");
return(null);
}
if (this.cboSpheres.SelectedIndex <= 0)
{
double num2;
num = Convert.ToDouble(this.txtMajorAxis.Text);
if (this.rdoFlattening.Checked)
{
num2 = 1.0 / Convert.ToDouble(this.txtFlattening.Text);
}
else
{
double num3 = Convert.ToDouble(this.txtMiniorAxis.Text);
num2 = (num - num3) / num;
}
((ISpheroidEdit)this.ispheroid_0).DefineEx(this.cboSpheres.Text, null, null, null, ref num, ref num2);
}
if (this.cboDatumName.SelectedIndex <= 0)
{
((IDatumEdit)this.idatum_0).DefineEx(this.cboDatumName.Text, null, null, null, this.ispheroid_0);
}
if (this.cboAngleName.SelectedIndex <= 0)
{
num = Convert.ToDouble(this.txtValue.Text);
((IAngularUnitEdit)this.iunit_0).DefineEx(this.cboAngleName.Text, null, null, null, ref num);
}
if (this.cboPrimeMeridians.SelectedIndex <= 0)
{
double num4 = Convert.ToDouble(this.txtDegree.Text);
if (num4 < 0.0)
{
num = (num4 - (Convert.ToDouble(this.txtMinute.Text) / 60.0)) -
(Convert.ToDouble(this.txtSecond.Text) / 3600.0);
}
else
{
num = (num4 + (Convert.ToDouble(this.txtMinute.Text) / 60.0)) +
(Convert.ToDouble(this.txtSecond.Text) / 3600.0);
}
((IPrimeMeridianEdit)this.iprimeMeridian_0).DefineEx(this.cboPrimeMeridians.Text, null, null, null,
ref num);
}
this.igeographicCoordinateSystem_0 = new GeographicCoordinateSystemClass();
IGeographicCoordinateSystemEdit edit = this.igeographicCoordinateSystem_0 as IGeographicCoordinateSystemEdit;
IAngularUnit geographicUnit = this.iunit_0 as IAngularUnit;
string alias = "";
try
{
edit.DefineEx(this.textEditName.Text, alias, alias, alias, alias, this.idatum_0, this.iprimeMeridian_0,
geographicUnit);
}
catch
{
MessageBox.Show("无法定义地理坐标!");
return(null);
}
return(this.igeographicCoordinateSystem_0);
}