hello group
first off, many thanks to all who helped with my previous question regarding
constant maps...however, i now have a new problem...
the application i am currently developing with visad has a feature to load and
display 2d image data from an ascii file...i am using the textadapter class to
read the file and turn into a flatfield...the ascii file is in the tab-spaced
format that the textadapter class can read....here is a snip of the first five
lines of an example ascii file:
<snip>
(Down_Range,Cross_Range)->(RCS)
Down_Range Cross_Range RCS
-755.383 -755.383 -124.0984508
-731.684 -755.383 -124.0586397
-707.986 -755.383 -123.995843
-684.288 -755.383 -123.9096856
...and so on
</snip>
in this case, 'down_range' maps to the x-axis, 'cross_range' maps to the
y-axis, and 'rcs' maps to an rgb value...everything loads and displays fine,
but there are three major problems:
1) loading the data is ___sloooow___...the example file i snipped above comes
to 147515 bytes (256 x 256 image size) and it takes a solid 30 seconds from
when the file is opened to when the image is finally displayed...we have c++
code in other applications that loads and displays the same data almost
instantly...is it a java problem?...is it visad?...is it something i'm doing
wrong?
2) panning and zooming of the image (and line plots for that matter) are slow
and choppy...when data is rendered as points, these functions are very quick,
smooth, and acceptable...is there any way to speed up panning/zooming?
3) is there any way to increase the resolution of the image rendering to make
it more 'smooth'?...right now it looks textured...when zoomed in closely, the
data points look very triangular...any ideas?
thanks in advance for any help that can be provided...let me know if you need
more information from me...peace!
jc
