Re: [visad] Isocontours as vectors


VisAD does create isocontours as vectors and fills
contours using triangles. These are passed into
Java3D as part of its scene graph (or kept as a VisAD
scene graph for Java2D). These vectors and filled
triangles are not easily accessible to applications
and if you are not an experienced programmer it will
be difficult for you to access them.

Good luck,

 -----Original Message-----

From: Jan Tošovský <j.tosovsky@xxxxxxxxxx>
To: visad@xxxxxxxxxxxxxxxx
Sent: Tue, Nov 10, 2009 2:19 pm
Subject: [visad] Isocontours as vectors

Hello Everyone, 
I was searching for any Java library to make isocontours from my 3D data and 
I've finally found your excellent suite, capable to offer much more than 
plotting of these. Thanks a lot for it! 
My goal is to export my final 2D data (color=f(x,y)) into vector graphics. I 
have some experience with SVG and recently also with basic SWF (Flash). My 
idea was to 'take' coords of individual points of isocontours and plot them 
as shape/polygon with some fill pattern. 
Looking into the code, mainly into the part where filled isocontours are 
plotted, I was lost a bit. I am not experienced programmer, rather 
occasional hobbyist. I was unable to locate any variable where array of 
points to plot is available and, from several methods, I am quite sure, that 
filling is made by some flood fill method rather than using polygons with 
some fill properties set. As this later method is more straightforward and 
efficient, I doubt you weren't trying it as well.  
Are there any objective reasons, why constructing of isocontours is not 
based on vector objects? Or it is posible, but not implemented yet? In later 
case, I offer you my little help in this area.  
If vector output is technically impossible, I'll have to continue in 
seaching for any additional Java library, capable to trace individual pixels 
into vector objects, like it is possible in some professional vector 
editors. But results of such conversion is unpredictable. 
Thank for any ideas. 
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