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wind_2_box.c

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00001 
00017 #include <grass/gis.h>
00018 
00019 
00033 int G_adjust_window_to_box(const struct Cell_head *src,
00034                            struct Cell_head *dst, int rows, int cols)
00035 {
00036     double ew, ns;
00037 
00038     G_copy((char *)dst, (char *)src, sizeof(*dst));
00039 
00040     /* calculate the effective resolutions */
00041     ns = (src->ns_res * src->rows) / rows;
00042     ew = (src->ew_res * src->cols) / cols;
00043 
00044     /* set both resolutions equal to the larger */
00045     if (ns > ew)
00046         ew = ns;
00047     else
00048         ns = ew;
00049 
00050     dst->ns_res = ns;
00051     dst->ew_res = ew;
00052 
00053     /* compute rows and cols */
00054     dst->rows = (dst->north - dst->south) / dst->ns_res;
00055     dst->cols = (dst->east - dst->west) / dst->ew_res;
00056 
00057     return 0;
00058 }

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