I said:
> and that can use the rectangle bounds to construct
> a new Gridded2DSet for the image region of interest,
Or even simpler, construct a Linear2DSet from the rectangle
bounds. Modifying the CellImpl in the main() method of
visad/bom/RubberBandBoxRendererJ3D.java, the code might
look something like:
final FlatField image = ... // your original image
final int size = ... // desired number of lines and
// elements in sub_image
CellImpl cell = new CellImpl() {
public void doAction() throws VisADException, RemoteException {
Set set = (Set) ref.getData();
float[][] samples = set.getSamples();
if (samples != null) {
Linear2DSet sub_set
new Linear2DSet(set.getType(),
samples[0][0], samples[0][1], size,
samples[1][0], samples[1][1], size);
FlatField sub_image = image.resample(sub_set);
// now sub_image contains the user-selected rectangular
// image region, resampled to (size x size) pixels
}
}
};
cell.addReference(ref);
If you want sub_image to contain exactly those pixels of image
within the region (i.e., no interpolation), then you'll need to
construct sub_set as those samples in image.getDomainSet() that
lie inside:
(samples[0][0], samples[0][1]) x (samples[1][0], samples[1][1])
If image.getDomainSet() is a Linear2DSet that won't be too
difficult, but if its a general Gridded2DSet or Irregular2DSet,
then that will be a bit complex.
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
