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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.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.
Bill Hibbard wrote: > > Hi Nicolas, > > > Let's suppose I have a big 3D block and also a 1D view "associated" with, > > for instance a vertical line passing through the block. > > If computations modify the 1D data, is there a "simple" > > way to propagate the changes to the 3D block (the father)? > > What else if there are 2 views sharing the same 3D block data? > > You can use CellImpls to do this. For each 1-D view of a 3-D block, > you'd construct a CellImpl whose doAction() method would propagate > the change to the 3-D block, as well as to the other 1-D views. > You'd pass a DataReference for the 1-D view to the addReference() > method of the CellImpl. In a situation with multiple 1-D views, > this can lead to event loops (i.e., A changes B which changes A > which changes B ...). So when a doAction changes B, it should > first test if the new value for B is the same as the old value > for B, and if they are equal then don't make the change. There > are various signatures in vsad/util/Util.java for a method > isApproximatelyEqual() for testing approximate equality between > floats and doubles. To efficiently modify a small number of values in a big 3-D block in a FlatField: float[][] values = field.getFloats(false); // don't copy . . . // code to modify selected locations in values array field.setSamples(values, false); // don't copy Bill
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