[geos-devel] Porting LengthIndexedLine.project?
strk at keybit.net
Sun Aug 2 09:23:18 EDT 2009
Let's ask Martin...
Are unit tests for LengthIndexedLine available or to be made ?
On Sat, Aug 01, 2009 at 12:02:07AM -0400, David Turner wrote:
> On Mon, 2009-07-27 at 17:42 -0400, David Turner wrote:
> > On Thu, 2009-07-23 at 21:53 +0200, strk wrote:
> > > On Thu, Jul 23, 2009 at 11:13:34AM -0400, David Turner wrote:
> > > > JTS has a class called LengthIndexedLine with a method "project", which
> > > > lets you figure out the nearest point on a line to a given point. This
> > > > is useful, for instance, if you are trying to figure out what street a
> > > > person is on from (possibly slightly inaccurate) GPS observations.
> > > >
> > > > http://tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/linearref/LengthIndexedLine.html#project(com.vividsolutions.jts.geom.Coordinate)
> > > >
> > > > PostGIS calls this function st_line_locate_point.
> > > >
> > > > GEOS doesn't seem to have it, even though I was under the impression
> > > > that GEOS was merely a port of JTS. If I port JTS's project function
> > > > and related functions such as extractPoint to GEOS, would that patch be
> > > > likely to be accepted? Or am I missing something about the relationship
> > > > between JTS and GEOS?
> > >
> > > Your patch would be welcome. Make sure to include unit testing please.
> > I have a patch. Unfortunately, I do not yet have unit tests, because I
> > cannot find the relevant Java unit tests to port. I could write my own,
> > but it seems like some of the other code uses ported Java unit tests,
> > and I want to follow the common practice.
> > Can you point me to the Java unit tests?
> Just wanted to follow up to be sure this wasn't lost. The example I'm
> looking at, in case I'm missing something, is:
> which claims to be:
> Ported from JTS junit/algorithm/RobustLineIntersectionTest.java
> I assume there are probably similar tests for the linearref stuff, but
> the JTS CVS appears to be empty or down or something, and Googling turns
> up nothing.
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