[postgis-users] How to get a java.awt.Polygon from a postgis wkb geometry column?
kneufeld at refractions.net
Fri Jul 6 09:14:09 PDT 2007
java.awt.Polygon? It's not very efficient, but you could try to read
the PostGIS geometry as WKB using JTS
(http://www.vividsolutions.com/JTS/JTSHome.htm), then iterate through
the coordinates in the exterior ring, extracting the raw x,y to pass as
an argument to java.awt.Polygon (int xpoints, int ypoints, int npoints)
This thread has some thoughts to read from a PostGIS database:
Hope this helps.
Stefan Zweig wrote:
> hi list,
> i am just wondering how i can draw to screen a Poylgon (or a Polyline/Point) which is stored in a postgis db?
> i have geographical coordinates stored in a table with the geometry coloumn being in the wkb format. i know, how to connect to my postgres db and how to query the geometry from that table (e.g. select the_geom from testtable where...). now i would need some javaclasses/javamethods which create Polygons (Polylines/Point) as i walk through the result set. i know that there is a wkb4j library, but unfortunately this badly documented and i don't know how to use it.
> has anybody experiences with that issue? i would appreciate any help.
> thanks in advance, stefan
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