[OpenJDK 2D-Dev] Speed of drawPolyline on JDK11

Peter Hull peterhull90 at gmail.com
Thu Oct 11 11:26:48 UTC 2018

Hi Laurent,
Thanks for the detailed explanation. I quickly checked on the older
Windows system and the Java 11 window was the same size as the Java 8
one, implying no scaling was going on (I guess just because it has a
lower resolution monitor) - so that confirms your hypothesis.

If I use -Dsun.java2d.uiScale=1.0 that's OK for my laptop, it doesn't
matter if the window is a bit small. However I believe some higher end
systems have much higher scaling factors (2x, 3x?). Is there a general
way to specify a 1px line regardless of scaling, because in my case I
don't mind too much if it's a 'hair-line'?

By the way, my actual application doesn't have 65000 lines but it
draws 3 graphs with about 3000 points, which makes it noticeably slow
when resizing the Window. I suppose I should look into cutting down
the number of points somehow...


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