1 files changed, 67 insertions, 0 deletions
diff --git a/src/patch/patch_info.hh b/src/patch/patch_info.hh
new file mode 100644
index 0000000..7f58f21
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+++ b/src/patch/patch_info.hh
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+// patch_info.hh -- POD struct of minimal info varying from one patch to another
+// $Id$
+
+//
+// prerequisites:
+//    <stdio.h>
+//    <assert.h>
+//    <math.h>
+//    "../jtutil/util.hh"
+//    "../jtutil//array.hh"
+//    "../jtutil/linear_map.hh"
+//    "coords.hh"
+//    "grid.hh"
+//
+
+//*****************************************************************************
+
+//
+// This (POD, and hence static-initializable) struct gives a minimal
+// set of information which varies from one patch to another.
+//
+// The member functions allow a patch to be constructed from this struct
+// together with the additional information provided by their arguments.
+// This doesn't allow the most general possible type of patch (eg it
+// constrains all ghost zones to have the same width), but does cover
+// the common casees.
+//
+// Arguments for member functions:
+// N_ghost_points = Width in grid points of all ghost zones.
+// N_extend_points = Number of grid points to extend each patch past
+//		     "just touching" so as to overlap neighboring patches.
+//		     Thus patches overlap by
+//			N_overlap_points = 2*N_extend_points + 1
+//		     grid points.  For example, with N_extend_points == 2,
+//		     here are the grid points of two neighboring patches:
+//			x   x   x   x   x   X   X
+//                                      |
+//			        O   O   o   o   o   o   o
+//		     Here | marks the "just touching" boundary,
+//		     x and o the grid points before this extension,
+//		     and X and O the extra grid points added by this
+//		     extension.
+// delta_drho_dsigma = Grid spacing (both rho and sigma) in degrees.
+//
+struct	patch_info
+	{
+	const char* name;
+	bool is_plus;
+	char ctype;
+	fp min_drho, max_drho;
+	fp min_dsigma, max_dsigma;
+
+	// compute and return reference to  struct grid_arrays::grid_array_pars
+	// ... result refers to internal static buffer;
+	//     the usual caveats about lifetimes/overwriting apply
+	const grid_arrays::grid_array_pars&
+	  grid_array_pars(int N_ghost_points, int N_extend_points,
+			  fp delta_drho_dsigma)
+		const;
+
+	// compute and return reference to  struct grid::grid_pars
+	// ... result refers to internal static buffer;
+	//     the usual caveats about lifetimes/overwriting apply
+	const grid::grid_pars& grid_pars(int N_extend_points,
+					 fp delta_drho_dsigma)
+		const;
+	};