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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