overlap.c

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/*!
   \file lib/vector/Vlib/overlap.c
 
   \brief Vector library - region/window overlap
 
   Higher level functions for reading/writing/manipulating vectors.
 
   SPDX-FileCopyrightText: 2001-2009 GRASS Development Team
   SPDX-License-Identifier: GPL-2.0-or-later
 
   \author Original author CERL, probably Dave Gerdes or Mike Higgins.
   \author Update to GRASS 5.7 Radim Blazek and David D. Gray.
 */
 
#include <grass/vector.h>
 
/*!
   Check if region overlaps with map extent.
 
   \param Map vector map
   \param n,s,e,w region bounding box
 
   \return 1 if regions overlap
   \return 0 if not
 */
int V__map_overlap(struct Map_info *Map, double n, double s, double e, double w)
{
    struct Cell_head W;
 
    /* updated for Lat lon support 21 Jun 91 */
    W.north = Map->constraint.box.N;
    W.south = Map->constraint.box.S;
    W.east = Map->constraint.box.E;
    W.west = Map->constraint.box.W;
    W.proj = Map->head.proj;
 
    return G_window_overlap(&W, n, s, e, w);
}