GeoTools: Creating a point and adding it to featureCollection

Question

I am implementing an interpolation of trajectory points. So, basically, I need to create several points along the azimuth from a starting point to a destination point. The problem is, I can't add a created point to a collection:

SimpleFeatureType featureType = featureSource.getSchema(); 

GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory(null); 
SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(featureType); 

SimpleFeatureCollection collection = featureSource.getFeatures(); 

/* Irrelevant code here 
----------------------- 
*/ 

Point2D newPt = setPointByAzimuth(startingPointCoords, azimuth, distance_to_next_point); 

Point pointToCollection = geometryFactory.createPoint(new Coordinate(newPt.getX(), newPt.getY())); 

featureBuilder.add(pointToCollection); //not quite sure what this does 

SimpleFeature feature = featureBuilder.buildFeature(null);       

collection.add(feature);

However, when I run this, the collection size does not change and nothing gets added to this collection. I am not sure what's the problem here.

Thanks,

score 3 · Answer 1 · answered Apr 14 '12 at 11:50

3

Not every implementation of SimpleFeatureCollection is mutable.

Try another way:

create new DefaultFeatureCollection and add your points to it;
then add it to MapContent with addLayer.

answered Apr 14 '12 at 11:50

Victor Sergienko

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The original problem is _"nothing gets added to this collection"_. That's correct. What I'm telling is to add *another* collection to the `MapContent`. – Victor Sergienko Mar 25 '13 at 14:33
Sorry, there were a problem with SimpleFeatureType object which has been applied to the MemoryFeatureCollection as formal parameter at constructor, thus, nothing was shown. Sorry once again, Your solution helps me. – Yuriy Chernyshov Mar 25 '13 at 15:09

GeoTools: Creating a point and adding it to featureCollection

1 Answers1