| 168 |
|
return(0); |
| 169 |
|
/* compute sample domain */ |
| 170 |
|
ip->smin[0] = ip->smin[1] = FHUGE; |
| 171 |
< |
ip->smul[0] = ip->smul[1] = -FHUGE; |
| 171 |
> |
ip->smax[0] = ip->smax[1] = -FHUGE; |
| 172 |
|
for (i = ip->ns; i--; ) { |
| 173 |
|
if (ip->spt[i][0] < ip->smin[0]) |
| 174 |
|
ip->smin[0] = ip->spt[i][0]; |
| 175 |
< |
if (ip->spt[i][0] > ip->smul[0]) |
| 176 |
< |
ip->smul[0] = ip->spt[i][0]; |
| 175 |
> |
if (ip->spt[i][0] > ip->smax[0]) |
| 176 |
> |
ip->smax[0] = ip->spt[i][0]; |
| 177 |
|
if (ip->spt[i][1] < ip->smin[1]) |
| 178 |
|
ip->smin[1] = ip->spt[i][1]; |
| 179 |
< |
if (ip->spt[i][1] > ip->smul[1]) |
| 180 |
< |
ip->smul[1] = ip->spt[i][1]; |
| 179 |
> |
if (ip->spt[i][1] > ip->smax[1]) |
| 180 |
> |
ip->smax[1] = ip->spt[i][1]; |
| 181 |
|
} |
| 182 |
< |
ip->smul[0] -= ip->smin[0]; |
| 183 |
< |
ip->smul[1] -= ip->smin[1]; |
| 184 |
< |
ip->grid2 = (ip->smul[0]*ip->smul[0] + ip->smul[1]*ip->smul[1]) * |
| 185 |
< |
(4./NI2DIM/NI2DIM); |
| 182 |
> |
ip->grid2 = ((ip->smax[0]-ip->smin[0])*(ip->smax[0]-ip->smin[0]) + |
| 183 |
> |
(ip->smax[1]-ip->smin[1])*(ip->smax[1]-ip->smin[1])) * |
| 184 |
> |
(1./NI2DIM/NI2DIM); |
| 185 |
|
if (ip->grid2 <= FTINY*ip->dmin*ip->dmin) |
| 186 |
|
return(0); |
| 188 |
– |
if (ip->smul[0] > FTINY) |
| 189 |
– |
ip->smul[0] = NI2DIM / ip->smul[0]; |
| 190 |
– |
if (ip->smul[1] > FTINY) |
| 191 |
– |
ip->smul[1] = NI2DIM / ip->smul[1]; |
| 187 |
|
/* allocate analysis data */ |
| 188 |
|
ip->da = (struct interp2_samp *)calloc( ip->ns, |
| 189 |
|
sizeof(struct interp2_samp) ); |
| 261 |
|
double |
| 262 |
|
interp2_wti(INTERP2 *ip, const int i, double x, double y) |
| 263 |
|
{ |
| 264 |
< |
int xfi, yfi; |
| 265 |
< |
double dir, rd, r2, d2; |
| 266 |
< |
int ri; |
| 267 |
< |
/* need to compute interpolant? */ |
| 273 |
< |
if (ip->da == NULL && !interp2_analyze(ip)) |
| 274 |
< |
return(0); |
| 275 |
< |
/* get grid position */ |
| 276 |
< |
xfi = (x - ip->smin[0]) * ip->smul[0]; |
| 277 |
< |
if (xfi >= NI2DIM) |
| 278 |
< |
xfi = NI2DIM-1; |
| 279 |
< |
else |
| 280 |
< |
xfi *= (xfi >= 0); |
| 281 |
< |
yfi = (y - ip->smin[1]) * ip->smul[1]; |
| 282 |
< |
if (yfi >= NI2DIM) |
| 283 |
< |
yfi = NI2DIM-1; |
| 284 |
< |
else |
| 285 |
< |
yfi *= (yfi >= 0); |
| 286 |
< |
x -= ip->spt[i][0]; /* check distance */ |
| 264 |
> |
double dir, rd, r2, d2; |
| 265 |
> |
int ri; |
| 266 |
> |
/* get relative direction */ |
| 267 |
> |
x -= ip->spt[i][0]; |
| 268 |
|
y -= ip->spt[i][1]; |
| 269 |
< |
d2 = x*x + y*y; |
| 289 |
< |
/* zero weight this zone? */ |
| 290 |
< |
if (d2 > ip->grid2 && ip->da[i].blkflg[yfi] & 1<<xfi) |
| 291 |
< |
return(.0); |
| 292 |
< |
|
| 293 |
< |
dir = atan2a(y, x); /* get relative direction */ |
| 269 |
> |
dir = atan2a(y, x); |
| 270 |
|
dir += 2.*PI*(dir < 0); |
| 271 |
|
/* linear radius interpolation */ |
| 272 |
|
rd = dir * (NI2DIR/2./PI); |
| 275 |
|
rd = (1.-rd)*ip->da[i].dia[ri] + rd*ip->da[i].dia[(ri+1)%NI2DIR]; |
| 276 |
|
rd = ip->smf * DECODE_DIA(ip, rd); |
| 277 |
|
r2 = 2.*rd*rd; |
| 278 |
< |
if (d2 > 21.*r2) { /* result would be < 1e-9 */ |
| 279 |
< |
ip->da[i].blkflg[yfi] |= 1<<xfi; |
| 278 |
> |
d2 = x*x + y*y; |
| 279 |
> |
if (d2 > 21.*r2) /* result would be < 1e-9 */ |
| 280 |
|
return(.0); |
| 305 |
– |
} |
| 281 |
|
/* Gaussian times harmonic weighting */ |
| 282 |
|
return( exp(-d2/r2) * ip->dmin/(ip->dmin + sqrt(d2)) ); |
| 283 |
|
} |
| 284 |
|
|
| 285 |
+ |
/* private call to get grid flag index */ |
| 286 |
+ |
static int |
| 287 |
+ |
interp2_flagpos(int fgi[2], INTERP2 *ip, double x, double y) |
| 288 |
+ |
{ |
| 289 |
+ |
int ingrid = 1; |
| 290 |
+ |
|
| 291 |
+ |
if (ip == NULL) /* paranoia */ |
| 292 |
+ |
return(-1); |
| 293 |
+ |
/* need to compute interpolant? */ |
| 294 |
+ |
if (ip->da == NULL && !interp2_analyze(ip)) |
| 295 |
+ |
return(-1); |
| 296 |
+ |
/* get grid position */ |
| 297 |
+ |
fgi[0] = (x - ip->smin[0]) * NI2DIM / (ip->smax[0] - ip->smin[0]); |
| 298 |
+ |
if (fgi[0] >= NI2DIM) { |
| 299 |
+ |
fgi[0] = NI2DIM-1; |
| 300 |
+ |
ingrid = 0; |
| 301 |
+ |
} else if (fgi[0] < 0) { |
| 302 |
+ |
fgi[0] = 0; |
| 303 |
+ |
ingrid = 0; |
| 304 |
+ |
} |
| 305 |
+ |
fgi[1] = (y - ip->smin[1]) * NI2DIM / (ip->smax[1] - ip->smin[1]); |
| 306 |
+ |
if (fgi[1] >= NI2DIM) { |
| 307 |
+ |
fgi[1] = NI2DIM-1; |
| 308 |
+ |
ingrid = 0; |
| 309 |
+ |
} else if (fgi[1] < 0) { |
| 310 |
+ |
fgi[1] = 0; |
| 311 |
+ |
ingrid = 0; |
| 312 |
+ |
} |
| 313 |
+ |
return(ingrid); |
| 314 |
+ |
} |
| 315 |
+ |
|
| 316 |
+ |
/* private call to set black flag if not too close to the given sample */ |
| 317 |
+ |
static void |
| 318 |
+ |
setblk(INTERP2 *ip, const int i, const int gi[2]) |
| 319 |
+ |
{ |
| 320 |
+ |
double dx = (gi[0]+.5)*(1./NI2DIM)*(ip->smax[0] - ip->smin[0]) + |
| 321 |
+ |
ip->smin[0] - ip->spt[i][0]; |
| 322 |
+ |
double dy = (gi[1]+.5)*(1./NI2DIM)*(ip->smax[1] - ip->smin[1]) + |
| 323 |
+ |
ip->smin[1] - ip->spt[i][1]; |
| 324 |
+ |
|
| 325 |
+ |
if (dx*dx + dy*dy > 2.*ip->grid2) |
| 326 |
+ |
ip->da[i].blkflg[gi[1]] |= 1<<gi[0]; |
| 327 |
+ |
} |
| 328 |
+ |
|
| 329 |
+ |
#define chkblk(ip,i,gi) ((ip)->da[i].blkflg[(gi)[1]]>>(gi)[0] & 1) |
| 330 |
+ |
|
| 331 |
|
/* Assign full set of normalized weights to interpolate the given position */ |
| 332 |
|
int |
| 333 |
|
interp2_weights(float wtv[], INTERP2 *ip, double x, double y) |
| 334 |
|
{ |
| 335 |
|
double wnorm; |
| 336 |
+ |
int fgi[2]; |
| 337 |
+ |
int ingrid; |
| 338 |
|
int i; |
| 339 |
|
|
| 340 |
< |
if ((wtv == NULL) | (ip == NULL)) |
| 340 |
> |
if (wtv == NULL) |
| 341 |
|
return(0); |
| 342 |
+ |
/* get flag position */ |
| 343 |
+ |
if ((ingrid = interp2_flagpos(fgi, ip, x, y)) < 0) |
| 344 |
+ |
return(0); |
| 345 |
|
|
| 346 |
|
wnorm = 0; /* compute raw weights */ |
| 347 |
< |
for (i = ip->ns; i--; ) { |
| 347 |
> |
for (i = ip->ns; i--; ) |
| 348 |
> |
if (chkblk(ip, i, fgi)) { |
| 349 |
> |
wtv[i] = 0; |
| 350 |
> |
} else { |
| 351 |
|
double wt = interp2_wti(ip, i, x, y); |
| 352 |
|
wtv[i] = wt; |
| 353 |
|
wnorm += wt; |
| 354 |
< |
} |
| 354 |
> |
if (wt <= 1e-9 && ingrid) |
| 355 |
> |
setblk(ip, i, fgi); |
| 356 |
> |
} |
| 357 |
|
if (wnorm <= 0) /* too far from all our samples! */ |
| 358 |
|
return(0); |
| 359 |
|
wnorm = 1./wnorm; /* normalize weights */ |
| 368 |
|
interp2_topsamp(float wt[], int si[], const int n, INTERP2 *ip, double x, double y) |
| 369 |
|
{ |
| 370 |
|
int nn = 0; |
| 371 |
+ |
int fgi[2]; |
| 372 |
+ |
int ingrid; |
| 373 |
|
double wnorm; |
| 374 |
|
int i, j; |
| 375 |
|
|
| 376 |
< |
if ((n <= 0) | (wt == NULL) | (si == NULL) | (ip == NULL)) |
| 376 |
> |
if ((n <= 0) | (wt == NULL) | (si == NULL)) |
| 377 |
|
return(0); |
| 378 |
+ |
/* get flag position */ |
| 379 |
+ |
if ((ingrid = interp2_flagpos(fgi, ip, x, y)) < 0) |
| 380 |
+ |
return(0); |
| 381 |
|
/* identify top n weights */ |
| 382 |
< |
for (i = ip->ns; i--; ) { |
| 382 |
> |
for (i = ip->ns; i--; ) |
| 383 |
> |
if (!chkblk(ip, i, fgi)) { |
| 384 |
|
const double wti = interp2_wti(ip, i, x, y); |
| 385 |
< |
if (wti <= 1e-9) |
| 385 |
> |
if (wti <= 1e-9) { |
| 386 |
> |
if (ingrid) |
| 387 |
> |
setblk(ip, i, fgi); |
| 388 |
|
continue; |
| 389 |
+ |
} |
| 390 |
|
for (j = nn; j > 0; j--) { |
| 391 |
|
if (wt[j-1] >= wti) |
| 392 |
|
break; |
| 400 |
|
si[j] = i; |
| 401 |
|
nn += (nn < n); |
| 402 |
|
} |
| 403 |
< |
} |
| 403 |
> |
} |
| 404 |
|
wnorm = 0; /* normalize sample weights */ |
| 405 |
|
for (j = nn; j--; ) |
| 406 |
|
wnorm += wt[j]; |
