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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 <stdlib.h>
#include "distance.h"
#include <grass/raster.h>
#include <grass/glocale.h>
/* write out result */
int write_output_map(char *output, int offset)
{
int fd_in = 0, fd_out;
int row;
register int col;
register CELL *cell;
register MAPTYPE *ptr;
int k;
fd_out = Rast_open_c_new(output);
if (offset)
fd_in = Rast_open_old(output, G_mapset());
cell = Rast_allocate_c_buf();
G_message(_("Writing output raster map <%s>..."), output);
ptr = map;
for (row = 0; row < window.rows; row++) {
G_percent(row, window.rows, 2);
col = window.cols;
if (!offset) {
while (col-- > 0)
*cell++ = (CELL)*ptr++;
}
else {
Rast_get_c_row_nomask(fd_in, cell, row);
while (col-- > 0) {
if (*cell == 0 && *ptr != 0)
*cell = (CELL)*ptr + offset;
cell++;
ptr++;
}
}
cell -= window.cols;
/* set 0 to NULL */
for (k = 0; k < window.cols; k++)
if (cell[k] == 0)
Rast_set_null_value(&cell[k], 1, CELL_TYPE);
Rast_put_row(fd_out, cell, CELL_TYPE);
}
G_percent(row, window.rows, 2);
G_free(cell);
if (offset)
Rast_close(fd_in);
Rast_close(fd_out);
return 0;
}
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