Hi Uwe,
yes there is a small trick, if we talk about the same problem.
1) go to Customize -> Options -> Snap/Grid -> Snap to vertices and
select the right snapping tolerance for your needs.
2) draw the draw the linestring
3) through the snap funktion you can easy draw the last point on the
first one :-)
In theory (OGC SimpleFeature) a closed Linestring is a Linestring with
the same start- and endpoint. If you have done this with the snapping
function OJ handels this two point as one point during a movement. And a
Linearring is a special case of a Linearring. You can read this in the
JTS documentation:
http://tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/geom/LineString.html
http://tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/geom/LineString.html
Or take a look in the OGC document
https://portal.opengeospatial.org/files/?artifact_id=829 on page 2-1
figure 2.1 and chapter 2.1.6 at page 2-5. Here you can read that a
closed Linestring a Linearring is.
With both (closed) geometries you cannot made a area computation! This
is in OJ only with a Polygon possible. Don't know why....
Regards
Matthias
Hi Uwe,
1) draw a polygon
2) select the item
3) right click ->Convert select geometies/layers to->LinearRing (or
Linestring)
Peppe
2015-04-08 15:21 GMT+02:00 Uwe Dalluege <uwe.dallu...@hcu-hamburg.de
<mailto:uwe.dallu...@hcu-hamburg.de>>:
Hi,
how can I draw a closed LineString (LinearRing)?
When I try to catch the first point of the
LineString with the last point of the same LineString
OpenJUMP does not catch the first point.
Is there a trick?
Regards
Uwe
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