Just an update followng my previous reply.
The edge.getObject actaully returns the underlying SimpleFeature.
so I just did this:
SimpleFeature sf = (SimpleFeature) e.getObject();
Geometry geom =(Geometry)sf.getDefaultGeometry();
double length = geom.getLength();
just using the generic Geometry, as I was lazy ;)
This should also allow access to the other attributes (untested)
Thanks for help,
Martin
On 9/1/2010 5:20 PM, Justin Deoliveira wrote:
Hi Martin,
Yeah you should be able to get at the underlying LineString by calling
e.getObject(). Something like:
DijkstraIterator.EdgeWeigter weighter =new
DijkstraIterator.EdgeWeighter() {
public double getWeight(Edge e) {
LineString l = (LineString) e.getObject();
return l.getLength();
}
}
However the linestring has no notion of units. That will depend on
whatever coordinate system your data is in.
On Wed, Sep 1, 2010 at 10:55 AM, Martin Tomko <[email protected]
<mailto:[email protected]>> wrote:
Dear All,
I am using the Graph api to construct a graph based on lineStrings -
that works perfectly. I would like to do a shortest path computation
based on geographical distance, and need to implement a Weighter.
the docs show this snippet:
DijkstraIterator.EdgeWeigter weighter =new
DijkstraIterator.EdgeWeighter() {
public double getWeight(Edge e) {
return 1.0;//constant
}
}
which results in a constant weight for an edge of 1.
How do I get the actual length of an edge, in the original
feature's units...
I need the values also for other purposes, so really neend to
access the edge length property.
Is it possible?
Thanks
Martin
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Justin Deoliveira
OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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Martin Tomko
Postdoctoral Research Assistant
Geographic Information Systems Division
Department of Geography
University of Zurich - Irchel
Winterthurerstr. 190
CH-8057 Zurich, Switzerland
email: [email protected]
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