Hi Craig-
I've been starting to use PGG to plot some flow fields
from image data. The images are displayed with the
usual origin at the top left and y-index increasing down
the screen.
Unfortunately, I can't figure out how to plot the vector
field in the same coordinates: e.g.,
imag2d $img, 'my image'
gplot( { justify=>1 }, with=>'vectors', $s->using(0,1),
($d)->using(0,1), { flipy=>1 } );
but this doesn't seem to do the right thing. That is, if $d at
one of the points in the image (at the corresponding $s), is
[0,1], I would like to see a a vector arrow starting at the
point in $s and pointing straight down 1 unit. Similarly,
if $d at the point was [-1,0] then the vector would be
drawn horizontal and pointing to the left.
Cheers,
Chris
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