Hi Ken-
I was hoping someone else would answer your question. ;-) I think the
main issue is anti-aliasing. The vector is just 3 lines (2 for the
arrow head, 1 for the arrow shaft). You could also try setting the line
width so the aliasing is not as much of a factor.
An alternative to changing the VisAD code would be to create your own
DataRenderer and override the getDataRenderer method of
ucar.visad.display.FlowDisplayable. That's what I did to change the
default behavior of WindBarbDisplayable.
There are examples of other flow DataRenderers (e.g. SwellRendererJ3D())
in the visad.bom class.
Don
On 7/31/13 12:16 PM, Ken Ellinwood wrote:
Answering my own question... the relevant code appears to be in
visad.ShadowType.makeFlow(). I'll switch to the visad mailing list for
anything else on this issue.
Ken
________________________________
From: Ken Ellinwood <kellinwood@xxxxxxxxx>
To: "idvusers@xxxxxxxxxxxxxxxx" <idvusers@xxxxxxxxxxxxxxxx>
Sent: Friday, July 26, 2013 3:32 PM
Subject: [idvusers] Better flow vector arrow rendering, how?
See the attached image which shows wind speed in a colored filled contour
display and the wind direction via a vector plan view. I'm hoping to get
better quality arrow rendering in the vector plan view. When the arrows are
oriented horizontally the arrow heads disappear and I'm hoping to fix this
somehow, even if it means modifying the code. I've got the IDV, Visad, and
NetCDF code for the the 4.0u1 release loaded into my IDE. I've been searching
and setting breakpoints hoping to figure out where the arrows are rendered, but
haven't stubled up on it yet. Any clues?
Thanks,
Ken
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--
Don Murray
NOAA/ESRL/PSD and CIRES
303-497-3596
http://www.esrl.noaa.gov/psd/people/don.murray/
