Thanks for posting about this Oskar. The radian/degree code can likely be changed (is that behavior specified as part of the Java spec?), though changing RPC serialization sounds like it would come with performance penalties - any comments there?
What is your preferred method of resolving the trig function issues - do you have a gwt-able java lib that you can suggest? On Thursday, August 14, 2014 7:36:29 AM UTC-5, Oskar Stangenberg wrote: > > Well, not every one of these things is easy to fix. Especially the > trig-functions - GWT is probably using the js-internal ones - which are > most likely pretty fast and good enough for client-only code. > The server-impl of the trig-functions isn't even java-code - they are > native functions. So their exact impl might even depend on the JRE used > > Am Dienstag, 12. August 2014 19:45:08 UTC+2 schrieb Juan Pablo Gardella: >> >> Thanks for sharing. It will very useful track each problem to GWT issue >> tracker. >> >> >> 2014-08-12 13:09 GMT-03:00 Oskar Stangenberg <crok...@gmail.com>: >> >>> Hi guys, we are developing a GWT-project with a lot of shared files. We >>> discovered a few discrepancies in the gwt-math and server-math and wanted >>> to share them for anybody else having those issues: >>> >>> - First and foremost: all native double calculations are identical >>> (+ - * / %) >>> - All trig-functions (sin,cos,tan,asin,acos,atan,atan2) seem to >>> produces slightly different results. We recommend doing your own impl >>> using >>> lookup-maps >>> - sqrt,log and pow seem to be identical although we only tested sqrt >>> thoroughly >>> - As far as we know all functions like max,min,abs etc are identical >>> - toDegrees and toRadian are actually different because GWT uses a >>> constant for 180./PI and PI/180. which changes the order of operation >>> compared to java >>> - For serialization of doubles we strongly suggest using >>> Double.doubleToLongbits and Double.longBitsToDouble. You can >>> additionally >>> use Long.toString(long,32) and Long.parseString(string,32) to compress >>> the >>> String-representation >>> >>> I hope we can help some people with this info. Especially the >>> toDegrees/toRadians was very surprising to find. This issue was reported >>> though and might be fixed in a future GWT-version (we tested 2.6.1). >>> In case you are interested how we solved the issues here is the >>> open-source-part >>> of our project >>> <https://xp-dev.com/sc/182005/HEAD/%2FGWTCommon%2Fsrc%2Fcom%2Funiverseprojects%2Fcommon%2Fshared%2Fmath> >>> so >>> you can check it out >>> Regards >>> Oskar Stangenberg >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Google Web Toolkit" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to google-web-toolkit+unsubscr...@googlegroups.com. >>> To post to this group, send email to google-we...@googlegroups.com. >>> Visit this group at http://groups.google.com/group/google-web-toolkit. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at http://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/d/optout.
