Re: [idvusers] Better flow vector arrow rendering, how?

• To: "idvusers@xxxxxxxxxxxxxxxx" <idvusers@xxxxxxxxxxxxxxxx>
• Subject: Re: [idvusers] Better flow vector arrow rendering, how?
• From: Ken Ellinwood <kellinwood@xxxxxxxxx>
• Date: Wed, 31 Jul 2013 12:14:44 -0700 (PDT)

Don,

Thanks for the tips, I'll look into using another renderer or creating my own.  

Ken



________________________________
 From: Don Murray (NOAA Affiliate) <don.murray@xxxxxxxx>
To: idvusers@xxxxxxxxxxxxxxxx 
Sent: Wednesday, July 31, 2013 8:54 AM
Subject: Re: [idvusers] Better flow vector arrow rendering, how?
 

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/

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• References:
  • [idvusers] Better flow vector arrow rendering, how?
    • From: Ken Ellinwood
  • Re: [idvusers] Better flow vector arrow rendering, how?
    • From: Ken Ellinwood
  • Re: [idvusers] Better flow vector arrow rendering, how?
    • From: Don Murray (NOAA Affiliate)