[josm-dev] License Change Plugin slows down drawing

[Frederik Ramm]

Hi,

    whenver a license change layer is active and you have lots of 
objects loaded, JOSM becomes noticeably slower.

I could use a little help here. Since many of you have tweaked JOSM's 
drawing performance in the past, maybe you only need to take a quick 
look at this drawing code

http://trac.openstreetmap.org/browser/applications/editors/josm/plugins/licensechange/src/org/openstreetmap/josm/plugins/licensechange/LicenseProblem.java

and you have an idea how it could be improved?

The "sliding window" of four consecutive nodes in the visit function is 
there to determine whether linecaps need to be drawn or not.

Is it the trigonometry in drawSegment? (This is more or less copied from 
similar code in the validation layer.) Would it perhaps make sense to 
cache the buffered outline instead of computing it each time?

Bye
Frederik
-- 
Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"