Hi Rob,
Thank you for the kind words.
I've been cutting through parts of geotools over the last month 1/2.
I think Michael also posted on a more effective way to do Multi to LineString
conversion.
He may be better for answering your WKT write but I would think you would need
to build a new FeatureCollection for the new x y points. But I could be wrong
because I've never used WKT writer.
The following method will build a FeatureCollection of LineString given a
TreeMap of X, Y points.
public FeatureCollection getLineFeature(TreeMap allPoints) throws Exception {
SimpleFeatureTypeBuilder typeBuilder = new SimpleFeatureTypeBuilder();
typeBuilder.setName("mytype");
typeBuilder.setCRS(crs);
typeBuilder.add("route", LineString.class);
typeBuilder.length(MAX_NAME_LENGTH).add("name", String.class);
final SimpleFeatureType TYPE = typeBuilder.buildFeatureType();
FeatureCollection collection = FeatureCollections.newCollection();
GeometryFactory factory = JTSFactoryFinder.getGeometryFactory(null);
SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(TYPE);
ArrayList coordList = new ArrayList();
Collection cl = allPoints.values();
Iterator it = cl.iterator();
while (it.hasNext()){
XyzPoint xyz = (XyzPoint)it.next();
coordList.add(new Coordinate(xyz.getX(),xyz.getY()));
//featureBuilder.set("name",xyz.getName());
}
Coordinate[] coords = CoordinateArrays.toCoordinateArray(coordList);
LineString lineString = factory.createLineString(coords);
//featureBuilder.set("name", "testing123");
featureBuilder.add(lineString);
collection.add(featureBuilder.buildFeature(null));
coordList.clear();
return collection;
}
Oliver
-----Original Message-----
From: "Heise, Robert" <[email protected]>
Sent: Saturday, November 28, 2009 9:12am
To: "Oliver Gottwald" <[email protected]>
Subject: RE: [Geotools-gt2-users] Converting MultiLineString to Linestring
Hello Oliver,
Thanks for the response. Your example did not directly solve the problem I was
having but certainly gave me a lot of ideas and insight on how to use geotools.
Thank you very much for taking the time to send me your code.
I have managed, using the below code to convert a MultiLineString to a
LineString, but am having problems converting that to WKT.. any thoughts?
MultiLineString multiLineString = (MultiLineString)
pSimpleFeature.getDefaultGeometry();
int N = multiLineString.getNumGeometries();
LineString lines[] = new LineString[ N ];
for (int i = 0; i < N; i++ ) {
lines[ i ] = (LineString) multiLineString.getGeometryN( i );
}
WKTWriter writer = new WKTWriter();
Thanks again
Rob
From: Oliver Gottwald [[email protected]]
Sent: Wednesday, November 25, 2009 4:37 PM
To: Heise, Robert
Subject: Re: [Geotools-gt2-users] Converting MultiLineString to Linestring
Rob,
Not sure if the below will help you.
I just put out an example with question for:
Feature Reference - Better Way?
In the following code I drill down from the layer to the Point.
In the below line I have "route" set as my attribute name for Point at
FeatureCollection creation.
Point p = (Point)sf.getAttribute("route");
You could use Point p = (Point)sf.getAttribute(0);
but I'm not sure how safe that is.
I assume you can swap out MultiLineString for Point on attribute extraction.
You may want to look at my example to see how i brought everything together.
Oliver
@SuppressWarnings("unchecked")
public static void getCoordinates(double cx, double cy) throws IOException {
MapLayer[] layers = map.getLayers();
for (int i=0; i<layers.length; i++){
FeatureSource<SimpleFeatureType, SimpleFeature> fs =
(FeatureSource<SimpleFeatureType, SimpleFeature>) layers[i].getFeatureSource();
FeatureCollection<SimpleFeatureType, SimpleFeature> fc =
fs.getFeatures();
Iterator<SimpleFeature> f = fc.iterator();
while (f.hasNext()){
SimpleFeature sf = (SimpleFeature)f.next();
Point p = (Point)sf.getAttribute("route");
double xi = p.getX();
double yi = p.getY();
if(checkFeatureReference(cx,cy,xi,yi)){
System.out.println("x: "+xi+" y: "+yi+" IN FEATURE REFERENCE
CIRCLE");
} else {
System.out.println("x: "+xi+" y: "+yi+" NOT IN FEATURE
REFERENCE CIRCLE");
}
}
}
}
-----Original Message-----
From: "Heise, Robert" <[email protected]>
Sent: Wednesday, November 25, 2009 4:23pm
To: "Michael Bedward" <[email protected]>
Cc: "[email protected]"
<[email protected]>
Subject: Re: [Geotools-gt2-users] Converting MultiLineString to Linestring
Thanks for the response.
If I am iterating over FeatureCollection, how do I get the MultiLineString from
SimpleFeature?
Thanks
Rob
-----Original Message-----
From: Michael Bedward [mailto:[email protected]]
Sent: Tuesday, November 24, 2009 6:29 PM
To: Heise, Robert
Cc: [email protected]
Subject: Re: [Geotools-gt2-users] Converting MultiLineString to Linestring
Hi Robert
MultiLineString mls = ...
int N = mls.getNumGeometries();
LineString lines[] = new LineString[ N ];
for ( int i = 0; i < N; i++ ) {
lines[ i ] = mls.getGeometryN( i );
}
Hope this helps,
Michael
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