Hi John,
This is a messy problem easiest handled by trial and error.
Based on your fdr1.png image, it looks like you need to make
a small adjustment to the values you are passing
to setAspectCartesian(), to make the box a little wider.
Good luck,
Bill
On Tue, 17 Aug 2004, John C Cartwright wrote:
> Hello All,
>
> I'm having some trouble creating the images that I need and would
> greatly appreciate a little direction.
>
> My objective is to render an image where the data completely fills the
> image - no borders, axes, etc.
>
> I have attempted to do this with the ProjectionControl#setMatrix to
> "zoom-in" so that the data display area fills the image. Problem with
> this approach is that the matrix values that I'm using are empirically
> determined and when the desired out image aspect ratio changes, I no
> longer get the desired results.
>
> Is there a (better) way to avoid getting the background? Or is there a
> way that I can calculate the matrix values based on desired image size?
>
> listed below is the pertinent section of code. Attached are two images:
> the first with the setMatrix() call enabled, the second without.
>
> Thanks for your help!
>
>
> -- john
>
>
> // zoom to get rid of black border
> ProjectionControl pc = display.getProjectionControl();
> double[] matrix = pc.getMatrix();
>
> // this number is empirically derived
> double[] mult = display.make_matrix(0.0, 0.0, 0.0,
> 1.515, 0.0, 0.0, 0.0);
> pc.setMatrix(display.multiply_matrix(mult, matrix));
>
> //set aspect ratio based on image size. Assumes
> geographic envelope
> //has already been adjusted to accomodate the ratio
> double[] aspect = new double[2]; //width,height
> if (outputWidth > outputHeight) {
> aspect[0] = outputWidth / outputHeight;
> aspect[1] = 1.0;
> } else {
> aspect[0] = 1;
> aspect[1] = outputHeight / outputWidth;
> }
> log.debug("aspect set to: "+aspect[0]+","+aspect[1]);
> pc.setAspectCartesian(aspect);
> }
>
>
>
>
>
>
>
>
>
>
>
> ====================================================
> John Cartwright
> Associate Scientist
> Geospatial Data Services Group
> CIRES, National Geophysical Data Center/NOAA
> (303) 497-6284
> John.C.Cartwright@xxxxxxxx
> ====================================================
>
>
