Hi Ricardo,
> I'm learning visad for the first time. I had found that is an excellet
> tool for my work but I can't find how to do some things I need. Please
> could somebody answer this questions:
>
> 1. I Load a satellite image as a funcion
> (x,y)->(band1,band2,...,band7). When I display the image using
> DisplayImplJ2D it is deformated into a scuare but I want it to be
> dispayed as a rectangle because my image is rectangular. How can I made
> it?
In your program you construct ScalarMaps like:
ScalarMap xmap = new ScalarMap(x, Display.XAxis);
display.addMap(xmap);
ScalarMap ymap = new ScalarMap(y, Display.YAxis);
display.addMap(ymap);
You can adjust the aspect ration of the image display by
appropriate calls to:
xmap.setRange(low_x, hi_x);
ymap.setRange(low_y, hi_y);
You can also use a call like:
ProjectionControl pc = display.getProjectionControl();
pc.setAspect(new double[] {1.0, 0.5}); // would need 3 values for Java3D
But in general setRange() is better than setAspect.
> 2. I want to interactively paint cirlcles or other shapes over the
> dispalyed image. Can I do it? How?
You can do it by constructing UnionSets of Gridded2DSets with
manifold dimension = 1, as in visad/examples/Rivers.java.
You can also do it by mapping RealTypes to Display.Shape, as
in visad/examples/Test47.java and Test46.java. There is also
a more recent and sophisticated example of Shape in
visad/bom/FlexibleTrackManipulation.java.
Cheers,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI 53706
hibbard@xxxxxxxxxxxxxxxxx 608-263-4427 fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html
