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/****************************************************************************
*
* MODULE: r.buffer
*
* AUTHOR(S): Michael Shapiro - CERL
*
* PURPOSE: This program creates distance zones from non-zero
* cells in a grid layer. Distances are specified in
* meters (on the command-line). Window does not have to
* have square cells. Works both for planimetric
* (UTM, State Plane) and lat-long.
*
* COPYRIGHT: (C) 2005 by the GRASS Development Team
*
* This program is free software under the GNU General Public
* License (>=v2). Read the file COPYING that comes with GRASS
* for details.
*
****************************************************************************/
#include "distance.h"
#include "local_proto.h"
int process_row(int row, int start_col)
{
int r, first_zone, col;
/* go north */
begin_distance(row);
for (r = row; r >= 0 && (first_zone = find_distances(r)) >= 0; r--) {
col = start_col;
while (col <= maxcol) {
process_left(row, r, col, first_zone);
col = process_at(row, r, col, first_zone);
col = process_right(row, r, col, first_zone);
}
}
/* go south */
reset_distances();
for (r = row + 1; r < window.rows && (first_zone = find_distances(r)) >= 0;
r++) {
col = start_col;
while (col <= maxcol) {
process_left(row, r, col, first_zone);
col = process_at(row, r, col, first_zone);
col = process_right(row, r, col, first_zone);
}
}
return 0;
}
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