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#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "global.h"
int get_ref_window(struct Ref *ref, int *ref_list, struct Cell_head *cellhd)
{
int i;
int count;
struct Cell_head win;
/* from all the files in the group, get max extends and min resolutions */
count = 0;
for (i = 0; i < ref->nfiles; i++) {
if (!ref_list[i])
continue;
if (count++ == 0) {
Rast_get_cellhd(ref->file[i].name, ref->file[i].mapset, cellhd);
}
else {
Rast_get_cellhd(ref->file[i].name, ref->file[i].mapset, &win);
/* max extends */
if (cellhd->north < win.north)
cellhd->north = win.north;
if (cellhd->south > win.south)
cellhd->south = win.south;
if (cellhd->west > win.west)
cellhd->west = win.west;
if (cellhd->east < win.east)
cellhd->east = win.east;
/* min resolution */
if (cellhd->ns_res > win.ns_res)
cellhd->ns_res = win.ns_res;
if (cellhd->ew_res > win.ew_res)
cellhd->ew_res = win.ew_res;
}
}
/* if the north-south is not multiple of the resolution,
* round the south downward
*/
cellhd->rows = (cellhd->north - cellhd->south) / cellhd->ns_res + 0.5;
cellhd->south = cellhd->north - cellhd->rows * cellhd->ns_res;
/* do the same for the west */
cellhd->cols = (cellhd->east - cellhd->west) / cellhd->ew_res + 0.5;
cellhd->west = cellhd->east - cellhd->cols * cellhd->ew_res;
return 1;
}
int georef_window(struct Image_Group *group, struct Cell_head *w1,
struct Cell_head *w2, int order, double res)
{
double n, e, ad;
struct _corner {
double n, e;
} nw, ne, se, sw;
/* extents */
/* compute geo ref of all corners */
if (order == 0)
I_georef_tps(w1->west, w1->north, &e, &n, group->E12_t, group->N12_t,
&group->control_points, 1);
else
I_georef(w1->west, w1->north, &e, &n, group->E12, group->N12, order);
w2->north = w2->south = n;
w2->west = w2->east = e;
nw.n = n;
nw.e = e;
if (order == 0)
I_georef_tps(w1->east, w1->north, &e, &n, group->E12_t, group->N12_t,
&group->control_points, 1);
else
I_georef(w1->east, w1->north, &e, &n, group->E12, group->N12, order);
ne.n = n;
ne.e = e;
if (n > w2->north)
w2->north = n;
if (n < w2->south)
w2->south = n;
if (e > w2->east)
w2->east = e;
if (e < w2->west)
w2->west = e;
if (order == 0)
I_georef_tps(w1->west, w1->south, &e, &n, group->E12_t, group->N12_t,
&group->control_points, 1);
else
I_georef(w1->west, w1->south, &e, &n, group->E12, group->N12, order);
sw.n = n;
sw.e = e;
if (n > w2->north)
w2->north = n;
if (n < w2->south)
w2->south = n;
if (e > w2->east)
w2->east = e;
if (e < w2->west)
w2->west = e;
if (order == 0)
I_georef_tps(w1->east, w1->south, &e, &n, group->E12_t, group->N12_t,
&group->control_points, 1);
else
I_georef(w1->east, w1->south, &e, &n, group->E12, group->N12, order);
se.n = n;
se.e = e;
if (n > w2->north)
w2->north = n;
if (n < w2->south)
w2->south = n;
if (e > w2->east)
w2->east = e;
if (e < w2->west)
w2->west = e;
/* resolution */
if (res > 0)
w2->ew_res = w2->ns_res = res;
else {
/* this results in ugly res values, and ns_res != ew_res */
/* and is no good for rotation */
/*
w2->ns_res = (w2->north - w2->south) / w1->rows;
w2->ew_res = (w2->east - w2->west) / w1->cols;
*/
/* alternative: account for rotation and order > 1 */
/* N-S extends along western and eastern edge */
w2->ns_res = (sqrt((nw.n - sw.n) * (nw.n - sw.n) +
(nw.e - sw.e) * (nw.e - sw.e)) +
sqrt((ne.n - se.n) * (ne.n - se.n) +
(ne.e - se.e) * (ne.e - se.e))) /
(2.0 * w1->rows);
/* E-W extends along northern and southern edge */
w2->ew_res = (sqrt((nw.n - ne.n) * (nw.n - ne.n) +
(nw.e - ne.e) * (nw.e - ne.e)) +
sqrt((sw.n - se.n) * (sw.n - se.n) +
(sw.e - se.e) * (sw.e - se.e))) /
(2.0 * w1->cols);
/* make ew_res = ns_res */
w2->ns_res = (w2->ns_res + w2->ew_res) / 2.0;
w2->ew_res = w2->ns_res;
/* nice round values */
if (w2->ns_res > 1) {
if (w2->ns_res < 10) {
/* round to first decimal */
w2->ns_res = (int)(w2->ns_res * 10 + 0.5) / 10.0;
w2->ew_res = w2->ns_res;
}
else {
/* round to integer */
w2->ns_res = (int)(w2->ns_res + 0.5);
w2->ew_res = w2->ns_res;
}
}
}
/* adjust extents */
ad = w2->north > 0 ? 0.5 : -0.5;
w2->north = (int)(ceil(w2->north / w2->ns_res) + ad) * w2->ns_res;
ad = w2->south > 0 ? 0.5 : -0.5;
w2->south = (int)(floor(w2->south / w2->ns_res) + ad) * w2->ns_res;
ad = w2->east > 0 ? 0.5 : -0.5;
w2->east = (int)(ceil(w2->east / w2->ew_res) + ad) * w2->ew_res;
ad = w2->west > 0 ? 0.5 : -0.5;
w2->west = (int)(floor(w2->west / w2->ew_res) + ad) * w2->ew_res;
w2->rows = (w2->north - w2->south + w2->ns_res / 2.0) / w2->ns_res;
w2->cols = (w2->east - w2->west + w2->ew_res / 2.0) / w2->ew_res;
G_message(_("Region N=%f S=%f E=%f W=%f"), w2->north, w2->south, w2->east,
w2->west);
G_message(_("Resolution EW=%f NS=%f"), w2->ew_res, w2->ns_res);
return 0;
}
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