working on grid catalogs

git-svn-id: http://svn.osgeo.org/metacrs/proj/trunk@2217 4e78687f-474d-0410-85f9-8d5e500ac6b2

1 files changed, 85 insertions, 0 deletions

diff --git a/src/proj_newgrid.h b/src/proj_newgrid.h
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+/******************************************************************************
+ * $Id$
+ *
+ * Project:  PROJ.4
+ * Purpose:  Definitions related to new datum shift grid (date aware) API.
+ * Author:   Frank Warmerdam, <warmerdam@pobox.com>
+ *
+ ******************************************************************************
+ * Copyright (c) 2012, Frank Warmerdam <warmerdam@pobox.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *****************************************************************************/
+
+#ifndef PROJ_NEWGRID_H
+#define PROJ_NEWGRID_H
+
+typedef struct {
+    LP ll;      /* lower left corner coordinates */
+    LP del;     /* size of cells */
+    ILP lim;    /* width/height of grid (value count) */
+
+    double date; /* year.fraction */
+
+    const char *definition; /* usually the gridname */
+
+    PJ_GRIDINFO  *gridinfo;
+    
+    int available; /* 0=unknown, 1=true, -1=false */
+} PJ_GridCatalogEntry;
+
+typedef struct {
+    char *catalog_name;
+    
+    LP last_grid_ll; /* maximum extent of catalog data */
+    LP last_grid_ur;
+
+    int entry_count;
+    PJ_GridCatalogEntry *entries;
+} PJ_GridCatalog;
+
+typedef struct {
+
+    PJ_GridCatalog *catalog;
+
+    double   datum_date;
+    
+    PJ_NGRIDINFO *last_before_grid;
+    PJ_NGRIDINFO *last_after_grid;
+ 
+    LP last_grid_ll; /* region for which the last grid set is optimal */
+    LP last_grid_ur;
+
+} PJ_GridEvalInfo;
+
+PJ_GridCatalog *pj_gc_findcatalog( const char * );
+void pj_gc_unloadall();
+
+PJ_GRIDINFO *pj_gc_findgrid( PJ_GridCatalog *catalog, int after, 
+                             LP location, double date,
+                             LP *optimal_ll, LP *optimal_ur,
+                             double *grid_date );
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ndef PROJ_NEWGRID_H */
+