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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi all,I'm having problems trying to use VisAD SpreadSheet to display the range that's mapped on to X and Y axis. I have the following mapping (longitude,latitude)->(temperature). When two buttons are pressed on the mouse a display comes up showing location of the longitude and latitude. What I would like to do is to display the data for temperature also. The SpreadSheet does this only when temperature is mapped to the Zaxis. As I am working in 2D, I only would like to map temperature to the IsoContour. I have tried searching this forum for clues as how I may do this and found some hints, but as I am not a very good programmer I would appreciate any help.
I found the following bit of information in this forum, but I have problems trying to use this in relation to the VisAD SpreadSheet.
To: John J Brecht <john.brecht@xxxxxxx> Subject: Re: Transform of ViewPlatform, and Re: range value at cursor From: "From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>" <billh@xxxxxxxxxxxxx> Date: Mon, 3 Jan 2000 18:28:29 -0600 (CST) cc: VisAD List <visad-list@xxxxxxxxxxxxx> In-Reply-To: <38711948.84C084D8@xxxxxxx>
What would be the most straightforward way to get the range value at a cursor location?
Say for example the data is a FlatField with MathType ((x, y0 -> range)
and ScalarMaps are map_x: x -> XAxis and map_y: y -> YAxis. Then:
double[] scale_offset = new double[2];
double[] dum_1 = new double[2];
double[] dum_2 = new double[2];
float[] cur = display.getDisplayRenderer().getCursor();
map_x.getScale(scale_offset, dum_1, dum_2);
double value_x = (cur[0] - scale_offset[1])/scale_offset[0];
map_y.getScale(scale_offset, dum_1, dum_2);
double value_y = (cur[1] - scale_offset[1])/scale_offset[0];
RealTuple tuple
new RealTuple(new Real[] {new Real(x, value_x),
new Real(y, value_y)});
double range_value = ((Real) flat_field.evaluate(tuple)).getValue();
Thank you,
Jacky
p.s. I would like to thank Tom Whittaker for finding the Map of Europe
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