[geos-devel] count of signOfDet2x2 calls in JTS

[Martin Davis]

Here's the results.  (Note these are for the SineStar^2 test, comparing two offset sine stars of the same size).

Good news: there's lots of calls to signOfDet2x2 , so GEOS looks like it's mirroring JTS
Bad news: why so many calls? 

I'll try and figure out the reason for the bad news...   8^(

n Pts: 1000
   signOfDet2x2 calls: 35394
   Executed in 1642 ms
n Pts: 2000
   signOfDet2x2 calls: 71106
   Executed in 80 ms
n Pts: 4000
   signOfDet2x2 calls: 142062
   Executed in 120 ms
n Pts: 8000
   signOfDet2x2 calls: 283838
   Executed in 221 ms
n Pts: 16000
   signOfDet2x2 calls: 568046
   Executed in 410 ms
n Pts: 32000
   signOfDet2x2 calls: 1136170
   Executed in 680 ms
n Pts: 64000
   signOfDet2x2 calls: 2272234
   Executed in 1332 ms
n Pts: 128000
   signOfDet2x2 calls: 4544410
   Executed in 2683 ms
n Pts: 256000
   signOfDet2x2 calls: 9088554
   Executed in 5367 ms

Martin Davis, Senior Technical Specialist
Vivid Solutions Inc.
Suite #1A-2328 Government Street   Victoria, B.C.   V8T 5G5
Phone: (250) 385 6040    Fax: (250) 385 6046
EMail: mbdavis at vividsolutions.com  Web: www.vividsolutions.com