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 
> <javascript:>>:
>
>> 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
>>
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