From: Wolfgang Bangerth Date: Sun, 1 Jun 2014 17:01:54 +0000 (+0000) Subject: Augment documentation. X-Git-Tag: v8.2.0-rc1~435 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d4473000aecef1ee742e8e3ffa7ee4c4657576e4;p=dealii.git Augment documentation. git-svn-id: https://svn.dealii.org/trunk@32994 0785d39b-7218-0410-832d-ea1e28bc413d --- diff --git a/deal.II/include/deal.II/numerics/data_out.h b/deal.II/include/deal.II/numerics/data_out.h index 64bb199e4c..0bc554148c 100644 --- a/deal.II/include/deal.II/numerics/data_out.h +++ b/deal.II/include/deal.II/numerics/data_out.h @@ -121,9 +121,20 @@ namespace internal * the sequence of cells to be converted into patches itself, but relies * on the two functions first_cell() and next_cell(). By default, they * return the first active cell, and the next active cell, respectively. - * Since they are @p virtual functions, you may overload them to select other - * cells for output. If cells are not active, interpolated values are taken - * for output instead of the exact values on active cells. + * Since they are @p virtual functions, you can write your own class + * derived from DataOut in which you overload these two functions to select other + * cells for output. This may, for example, include only cells that are + * in parts of a domain (e.g., if you don't care about the solution elsewhere, + * think for example a buffer region in which you attenuate outgoing waves + * in the Perfectly Matched Layer method) or if you don't want output to + * be generated at all levels of an adaptively refined mesh because this + * creates too much data (in this case, the set of cells returned by + * your implementations of first_cell() and next_cell() will include + * non-active cells, and DataOut::build_patches() will simply take + * interpolated values of the solution instead of the exact values on these + * cells children for output). Once you derive your own class, you would + * just create an object of this type instead of an object of type DataOut, + * and everything else will remain the same. * * The two functions are not constant, so you may store information within * your derived class about the last accessed cell. This is useful if the