Thanx but now i have the same pb with this two following polygons : P1 POLYGON ((1600 0.4, 1600 0.48, 1651 0.48, 1651 0.5, 1700 0.5, 1700 0.56, 1750 0.56, 1750...
360
Martin Davis
mbdavis@...
Jul 17, 2003 6:58 pm
Well, after some investigation it looks like you might have hit a actual robustness failure within JTS. Remember, the algorithms used for the boolean...
361
register
robmeek355
Jul 20, 2003 7:34 pm
I think I've got at least the beginnings of a working solution to my problem now. Here is an example applet: http://www.robmeek.com/test/jts/test.html ...
362
Jos€ ¦é Ram€ ¦ón Mej€...
jose_ramon_m...
Jul 21, 2003 1:16 pm
Great example! Of course I'd like to see the code. José Ramón...
363
atompilz_de
Aug 19, 2003 3:09 pm
Hello all, is this group still active? How do I use the PolygonBuilder? Say I have a *simple* LineString, forming a triangle as below. How do I build a Polygon...
364
tommaso.nolli@...
tom_0002002
Aug 19, 2003 8:00 pm
I will be out of the office starting 18/08/2003 and will not return until 01/09/2003. Risponderò al messaggio al mio ritorno....
365
Martin Davis
mbdavis@...
Aug 29, 2003 3:49 pm
... I agree with Norman - I don't think it's even possible to determine a labelling with this property in the general case, let alone come up with a reasonable...
366
hr_stoyanov
Aug 30, 2003 2:13 am
Hi all-, First, let me thank VIVIDSOLUTIONS for providing JTS, JCS and JUMP as open source to the GIS community! I noticed that JCS and JUMP are GPLed, while...
367
David Garnier
wkb4j
Aug 31, 2003 11:56 am
Hello, I'm happy to announce that WKB4J 1.0 RC1 has been released. WKB4J is a Java library designed to read the Well-Known Binary (WKB) format from a database...
368
David Blasby
dblasby@...
Sep 3, 2003 12:42 am
Jody had problems sending this to the jts list. Afternoon all: I noticed that JTS Geometry does not implement the Object equals/hashcode methods. So the...
369
Martin Davis
mbdavis@...
Sep 3, 2003 3:48 pm
The situation for equals is a bit confusing, since the JTS equals method follows the OGC semantics, testing for topological equality rather than exact...
370
Martin Davis
mbdavis@...
Sep 4, 2003 11:24 pm
We've been doing some more thinking about whether Geometry should implement equals(Object) and hashCode() with pointwise-equality semantics. There's actually...
371
Coats, Andy W
awcoats
Sep 5, 2003 4:47 am
It is funny we had the same discussions when converting the Java code to c#. In c# there is operator = and .Equals(). Over-riding Equals() means you have to...
372
Galaxy Engine
galaxy_engine
Sep 5, 2003 9:12 am
... The other important comparison you get from object in C# is .ReferenceEquals (it's a static). Often two objects to want to be checked for topographical ...
373
Norman Vine
nhv
Sep 5, 2003 11:11 am
... Hmm.. color me dense but ... I guess I need an example of where a geometric object equals another geometric object where their geometries differ before I...
374
commcast2003
Sep 5, 2003 3:06 pm
Hi everybody, Can anyone tell me exactly how does the EnhancedPrecisionOp class allow to enhance the precision of the Geometry functions? (Does it take into...
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Jody Garnett
jgarnett@...
Sep 5, 2003 4:43 pm
... That association based on identity sounds suspisiously like a feature - don't people usually use aggregation to capture identity associations? When...
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Martin Davis
mbdavis@...
Sep 5, 2003 5:08 pm
EnhancedPrecisionOp maximises the amount of precision available to the method being called by "removing"; redundant identical high-precision digits from the...
377
Martin Davis
mbdavis@...
Sep 5, 2003 5:08 pm
Thanks for the feedback, everyone. I have to admit, I like the arguments in favour of value-based equals. There are a couple of places in JTS algorithms where...
378
Norman Vine
nhv
Sep 5, 2003 7:10 pm
Martin Davis ... When used as Geometries yes The Factories won't be able to tell the differance ... I suggest that these augmented Geometries should be a new...
379
hr_stoyanov
Sep 5, 2003 8:16 pm
... equals. There are a couple of places in JTS algorithms where identity-based semantics are assumed, but they can be changed, I think. I agree with the...
380
Martin Davis
mbdavis@...
Sep 5, 2003 9:22 pm
... Hmmm... not sure I agree. It's not the factories that care, but the various methods which use the info in the context to control how they function. In...
381
Martin Davis
mbdavis@...
Sep 5, 2003 9:38 pm
... I've thought about this once in a while. It complicates the API quite a bit, because you end up having to pass in various extra bits of information to...
382
Norman Vine
nhv
Sep 5, 2003 9:51 pm
Martin Davis ... Of course, I should have said the 'Factory Methods shouldn't be able to tell the difference' I appreciate that two Geometries can have...
383
jonathan_aquino
Sep 5, 2003 10:24 pm
... Depends how you cast it: equals((Object)x) vs. equals((Geometry)x)...
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Martin Davis
mbdavis@...
Sep 5, 2003 10:25 pm
... Well, more or less this is the idea. Of course it's likely that the implementation of the CoordinateList in the GeometryBuilder would be different than...
385
aronolsen
Sep 11, 2003 1:35 am
Equals? What is "equals()" and when. In some RDMS' you wish to compare geometries for equalities. Well, in there you will have a pretty good idea how the...
386
aronolsen
Sep 11, 2003 1:56 am
Example: I draw a polygon in some theme/-layer. It is not supposed to overlap existing polygons. Thus, I find intersecting ones. I subtract my polygons from...
387
Jody Garnett
jgarnett@...
Sep 11, 2003 2:28 am
... I am a little confused by your message.... There are several definitions of equals. JTS Geometry currently has three and you can always implement more. For...
388
aronolsen
Sep 11, 2003 3:20 am
Ok, I may have been a little out of line, but actually all these messages appeared when I was in need of equals(), when deciding whether I needed to update a...
