Does anyone know how to convert existing line geometry to polygons with arcobjects as it works with the geoprocessing tool "feature to polygon"?
[GIS] How to convert existing lines to polygons with Arcobjects, preferably in C#
arcgis-desktoparcmaparcobjects
Related Solutions
The below Snippet could help..
//Get the Feature or FeatureCursor as you like..
IMxDocument pMxdoc = (IMxDocument)m_application.Document;
IMap pMap = pMxdoc.FocusMap;
IFeatureLayer pFtrLyr = (IFeatureLayer)pMap.get_Layer(0);
IFeatureClass pFC = pFtrLyr.FeatureClass;
IFeature polygonFeature = pFC.GetFeature(yourobjectid);
IPointCollection pPtsColl = (IPointCollection)polygonFeature.ShapeCopy;
double tempValue;
IPoint pPoint;
IPointCollection updColl = new PolygonClass();
for (int i = 0; i < pPtsColl.PointCount; i++)
{
pPoint = pPtsColl.get_Point(i);
tempValue = pPoint.X;
pPoint.X = pPoint.Y;
pPoint.Y = tempValue;
object missing = Type.Missing;
updColl.AddPoint(pPoint, ref missing, ref missing);
}
polygonFeature.Shape = (IGeometry)updColl;
polygonFeature.Store();
The best solution would be to follow @WHuber's Comment to do an affine transformation..something which can be done using IAffineTransformation2D..So there will be no need to worry about Multipart polygons and polygons with hole..
You might consider using a spatial cache via ISpatialCacheManager3. The documentation doesn't say if all the featureclasses in the cache need to be in the same workspace, see the Using spatial caching to optimize spatial queries section. I'd be very curious if that is the case.
Here's a snippet from that page:
// Open the feature classes used by the queries.
IFeatureClass blocksFeatureClass = featureWorkspace.OpenFeatureClass("Blocks");
IFeatureClass parcelsFeatureClass = featureWorkspace.OpenFeatureClass("Parcels");
// Fill the spatial cache.
ISpatialCacheManager spatialCacheManager = (ISpatialCacheManager)featureWorkspace;
// Check if the cache has been filled.
if (!spatialCacheManager.CacheIsFull)
{
// If not full, fill the cache.
spatialCacheManager.FillCache(cacheExtent);
}
// Execute spatial queries.
// Empty the cache.
spatialCacheManager.EmptyCache();
Best Answer
The IFeatureConstruct interface has several different methods for doing this.