jim
i just switched to a DisplayImplJ3D with a TwoDDisplayRendererJ3D...the image
did not load much faster, but it definitely looked much better (less grainy)
and the pan/zoom functions were very smooth...basically it solved #2 and #3
problems from my initial email, but #1 still remains....any ideas on loading
data into visad more quickly?....the file is only 147k, so it should be quick,
right?
thanks to jim k for the suggestion!
jc
> -----Original Message-----
> From: Jim Koutsovasilis [mailto:jimk@xxxxxxxxxx]
> Sent: Monday, January 05, 2004 4:46 PM
> To: Jim Cookas
> Cc: visad@xxxxxxxxxxxxxxxx
> Subject: Re: slow 2d image generation
>
>
> Hello Jim,
>
> if you are using a DisplayImplJ2D display, try a
> DisplayImplJ3D instead.
> It might be faster.
>
> Regards,
> Jim.
> ---
> Jim Koutsovasilis
> Bureau of Meteorology, Australia
> jimk@xxxxxxxxxx
>
> On Mon, Jan 05, 2004 at 04:24:52PM -0600, Jim Cookas wrote:
> > 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
> >
>
>
