/* -------------------------------------------------------------------- */
/* Reading the Fields in this Feature */
/* -------------------------------------------------------------------- */
public static void CreateTreeFields(ref TreeNode thisFeatureTree, Feature feature, FeatureDefn featureDefn)
{
// field definition as we iterate through the fields
FieldDefn iFieldDefn;
int nameIndex;
int objlIndex;
string nameString;
string objlString;
// To get the name and the S-57 Type code (OBJL), we have to look forward into the fields. This piece of code
// is mostly here to show how that is done as will need this when rendering these objects. You could easily add
// shapes or color, but it is not necessary here. The name and the code is nice for the debug file though so we can
// see what each feature is.
// OBJL field should always exist - the exception are the meta data fields such as DSID which has no code.
objlIndex = featureDefn.GetFieldIndex("OBJL");
if (objlIndex > 0)
{
objlString = DecodeField(feature, featureDefn.GetFieldDefn(objlIndex), objlIndex);
}
else
{
objlString = "No Code";
}
// name field may not exist. we could get either the info or text description if they exist
nameIndex = featureDefn.GetFieldIndex("OBJNAM");
if (nameIndex > 0)
{
nameString = DecodeField(feature, featureDefn.GetFieldDefn(nameIndex), nameIndex);
}
else
{
nameString = "Not Named";
}
DebugUtil.WriteLine();
DebugUtil.WriteLine(string.Format(" *** Feature: {0}, Name: {1}, S-57 Code: {2}", featureDefn.GetName(), nameString, objlString));
DebugUtil.WriteLine();
// get the styles, if any
if (feature.GetStyleString() != null)
{
DebugUtil.WriteLine(" Style = " + feature.GetStyleString());
}
// this gets the sub-geometries. not all features have sub-geometries
Geometry geom = feature.GetGeometryRef();
if (geom != null)
{
DebugUtil.WriteLine(" Geometry Name: " + geom.GetGeometryName() + " Sub-geometry Count: " + geom.GetGeometryCount());
Geometry sub_geom;
for (int i = 0; i < geom.GetGeometryCount(); i++)
{
sub_geom = geom.GetGeometryRef(i);
if (sub_geom != null)
{
string subGeoString;
DebugUtil.Write(" sub-geometry " + i + ": ");
switch (sub_geom.GetGeometryType())
{
case wkbGeometryType.wkbLineString:
case wkbGeometryType.wkbPoint25D:
sub_geom.ExportToWkt(out subGeoString);
DebugUtil.WriteLine(subGeoString);
TreeUtil.AddChildNode(thisFeatureTree, subGeoString);
break;
default:
DebugUtil.WriteLine("Unhandled subgeometry type: " + sub_geom.GetGeometryType());
TreeUtil.AddChildNode(thisFeatureTree, "Unhandled sub-geomtry type", sub_geom.GetGeometryType().ToString());
break;
}
}
}
// a bit confusing, but if it has no sub geometries, use the base geometry. mostly applies to the type POINT
if (geom.GetGeometryCount() == 0)
{
string geom_wkt;
geom.ExportToWkt(out geom_wkt);
DebugUtil.WriteLine(" geom_wkt: " + geom_wkt);
TreeUtil.AddChildNode(thisFeatureTree, geom_wkt);
}
} // if geo != null
for (int iField = 0; iField < feature.GetFieldCount(); iField++)
{
iFieldDefn = featureDefn.GetFieldDefn(iField);
// not all fields have usable information, skip those that don't.
if (feature.IsFieldSet(iField)) // IsFieldSet is a handy way to see if the field has any actual information
{
DebugUtil.Write(" ");
DebugUtil.Write("Field Name: " + iFieldDefn.GetName() + ", ");
DebugUtil.Write("Type Name: " + iFieldDefn.GetFieldTypeName(iFieldDefn.GetFieldType()) + ", ");
DebugUtil.Write("Field Type: " + iFieldDefn.GetFieldType() + ", ");
DebugUtil.Write("Value: " + DecodeField(feature, iFieldDefn, iField));
DebugUtil.WriteLine();
} // if isField
}
}
