| 1 |
greg |
1.1 |
#ifndef lint |
| 2 |
greg |
2.15 |
static const char RCSid[] = "$Id$"; |
| 3 |
greg |
1.1 |
#endif |
| 4 |
|
|
/* |
| 5 |
|
|
* data.c - routines dealing with interpolated data. |
| 6 |
|
|
*/ |
| 7 |
|
|
|
| 8 |
greg |
2.15 |
/* ==================================================================== |
| 9 |
|
|
* The Radiance Software License, Version 1.0 |
| 10 |
|
|
* |
| 11 |
|
|
* Copyright (c) 1990 - 2002 The Regents of the University of California, |
| 12 |
|
|
* through Lawrence Berkeley National Laboratory. All rights reserved. |
| 13 |
|
|
* |
| 14 |
|
|
* Redistribution and use in source and binary forms, with or without |
| 15 |
|
|
* modification, are permitted provided that the following conditions |
| 16 |
|
|
* are met: |
| 17 |
|
|
* |
| 18 |
|
|
* 1. Redistributions of source code must retain the above copyright |
| 19 |
|
|
* notice, this list of conditions and the following disclaimer. |
| 20 |
|
|
* |
| 21 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright |
| 22 |
|
|
* notice, this list of conditions and the following disclaimer in |
| 23 |
|
|
* the documentation and/or other materials provided with the |
| 24 |
|
|
* distribution. |
| 25 |
|
|
* |
| 26 |
|
|
* 3. The end-user documentation included with the redistribution, |
| 27 |
|
|
* if any, must include the following acknowledgment: |
| 28 |
|
|
* "This product includes Radiance software |
| 29 |
|
|
* (http://radsite.lbl.gov/) |
| 30 |
|
|
* developed by the Lawrence Berkeley National Laboratory |
| 31 |
|
|
* (http://www.lbl.gov/)." |
| 32 |
|
|
* Alternately, this acknowledgment may appear in the software itself, |
| 33 |
|
|
* if and wherever such third-party acknowledgments normally appear. |
| 34 |
|
|
* |
| 35 |
|
|
* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
| 36 |
|
|
* and "The Regents of the University of California" must |
| 37 |
|
|
* not be used to endorse or promote products derived from this |
| 38 |
|
|
* software without prior written permission. For written |
| 39 |
|
|
* permission, please contact [email protected]. |
| 40 |
|
|
* |
| 41 |
|
|
* 5. Products derived from this software may not be called "Radiance", |
| 42 |
|
|
* nor may "Radiance" appear in their name, without prior written |
| 43 |
|
|
* permission of Lawrence Berkeley National Laboratory. |
| 44 |
|
|
* |
| 45 |
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| 46 |
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 47 |
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 48 |
|
|
* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
| 49 |
|
|
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 50 |
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 51 |
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| 52 |
|
|
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| 53 |
|
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 54 |
|
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 55 |
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 56 |
|
|
* SUCH DAMAGE. |
| 57 |
|
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* ==================================================================== |
| 58 |
|
|
* |
| 59 |
|
|
* This software consists of voluntary contributions made by many |
| 60 |
|
|
* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
| 61 |
|
|
* information on Lawrence Berkeley National Laboratory, please see |
| 62 |
|
|
* <http://www.lbl.gov/>. |
| 63 |
|
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*/ |
| 64 |
|
|
|
| 65 |
greg |
1.1 |
#include "standard.h" |
| 66 |
|
|
|
| 67 |
|
|
#include "color.h" |
| 68 |
|
|
|
| 69 |
greg |
1.11 |
#include "resolu.h" |
| 70 |
|
|
|
| 71 |
greg |
1.1 |
#include "data.h" |
| 72 |
|
|
|
| 73 |
greg |
2.7 |
/* picture memory usage before warning */ |
| 74 |
|
|
#ifndef PSIZWARN |
| 75 |
|
|
#ifdef BIGMEM |
| 76 |
gregl |
2.13 |
#define PSIZWARN 5000000 |
| 77 |
greg |
2.7 |
#else |
| 78 |
gregl |
2.13 |
#define PSIZWARN 1500000 |
| 79 |
greg |
2.7 |
#endif |
| 80 |
|
|
#endif |
| 81 |
greg |
1.1 |
|
| 82 |
greg |
2.7 |
#ifndef TABSIZ |
| 83 |
greg |
2.6 |
#define TABSIZ 97 /* table size (prime) */ |
| 84 |
greg |
2.7 |
#endif |
| 85 |
greg |
2.6 |
|
| 86 |
|
|
#define hash(s) (shash(s)%TABSIZ) |
| 87 |
|
|
|
| 88 |
|
|
|
| 89 |
|
|
static DATARRAY *dtab[TABSIZ]; /* data array list */ |
| 90 |
greg |
1.1 |
|
| 91 |
|
|
|
| 92 |
|
|
DATARRAY * |
| 93 |
|
|
getdata(dname) /* get data array dname */ |
| 94 |
|
|
char *dname; |
| 95 |
|
|
{ |
| 96 |
|
|
char *dfname; |
| 97 |
|
|
FILE *fp; |
| 98 |
|
|
int asize; |
| 99 |
greg |
1.4 |
register int i, j; |
| 100 |
greg |
1.1 |
register DATARRAY *dp; |
| 101 |
|
|
/* look for array in list */ |
| 102 |
greg |
2.6 |
for (dp = dtab[hash(dname)]; dp != NULL; dp = dp->next) |
| 103 |
greg |
1.1 |
if (!strcmp(dname, dp->name)) |
| 104 |
|
|
return(dp); /* found! */ |
| 105 |
|
|
/* |
| 106 |
|
|
* If we haven't loaded the data already, we will look |
| 107 |
greg |
2.5 |
* for it in the directories specified by the library path. |
| 108 |
greg |
1.1 |
* |
| 109 |
|
|
* The file has the following format: |
| 110 |
|
|
* |
| 111 |
greg |
1.4 |
* N |
| 112 |
greg |
1.1 |
* beg0 end0 n0 |
| 113 |
|
|
* beg1 end1 n1 |
| 114 |
|
|
* . . . |
| 115 |
greg |
1.4 |
* begN endN nN |
| 116 |
greg |
1.1 |
* data, later dimensions changing faster |
| 117 |
|
|
* . . . |
| 118 |
|
|
* |
| 119 |
greg |
1.4 |
* For irregularly spaced points, the following can be |
| 120 |
|
|
* substituted for begi endi ni: |
| 121 |
|
|
* |
| 122 |
greg |
1.6 |
* 0 0 ni p0i p1i .. pni |
| 123 |
greg |
1.1 |
*/ |
| 124 |
|
|
|
| 125 |
greg |
2.8 |
if ((dfname = getpath(dname, getlibpath(), R_OK)) == NULL) { |
| 126 |
greg |
1.1 |
sprintf(errmsg, "cannot find data file \"%s\"", dname); |
| 127 |
|
|
error(USER, errmsg); |
| 128 |
|
|
} |
| 129 |
|
|
if ((fp = fopen(dfname, "r")) == NULL) { |
| 130 |
|
|
sprintf(errmsg, "cannot open data file \"%s\"", dfname); |
| 131 |
|
|
error(SYSTEM, errmsg); |
| 132 |
|
|
} |
| 133 |
|
|
/* get dimensions */ |
| 134 |
greg |
2.15 |
if (fgetval(fp, 'i', (char *)&asize) <= 0) |
| 135 |
greg |
1.1 |
goto scanerr; |
| 136 |
greg |
2.12 |
if (asize <= 0 | asize > MAXDDIM) { |
| 137 |
greg |
1.1 |
sprintf(errmsg, "bad number of dimensions for \"%s\"", dname); |
| 138 |
|
|
error(USER, errmsg); |
| 139 |
|
|
} |
| 140 |
greg |
2.12 |
if ((dp = (DATARRAY *)malloc(sizeof(DATARRAY))) == NULL) |
| 141 |
|
|
goto memerr; |
| 142 |
|
|
dp->name = savestr(dname); |
| 143 |
|
|
dp->type = DATATY; |
| 144 |
|
|
dp->nd = asize; |
| 145 |
greg |
1.1 |
asize = 1; |
| 146 |
|
|
for (i = 0; i < dp->nd; i++) { |
| 147 |
greg |
2.15 |
if (fgetval(fp, DATATY, (char *)&dp->dim[i].org) <= 0) |
| 148 |
greg |
1.6 |
goto scanerr; |
| 149 |
greg |
2.15 |
if (fgetval(fp, DATATY, (char *)&dp->dim[i].siz) <= 0) |
| 150 |
greg |
1.10 |
goto scanerr; |
| 151 |
greg |
2.15 |
if (fgetval(fp, 'i', (char *)&dp->dim[i].ne) <= 0) |
| 152 |
greg |
1.10 |
goto scanerr; |
| 153 |
greg |
1.6 |
if (dp->dim[i].ne < 2) |
| 154 |
|
|
goto scanerr; |
| 155 |
|
|
asize *= dp->dim[i].ne; |
| 156 |
|
|
if ((dp->dim[i].siz -= dp->dim[i].org) == 0) { |
| 157 |
greg |
2.12 |
dp->dim[i].p = (DATATYPE *) |
| 158 |
|
|
malloc(dp->dim[i].ne*sizeof(DATATYPE)); |
| 159 |
greg |
1.4 |
if (dp->dim[i].p == NULL) |
| 160 |
|
|
goto memerr; |
| 161 |
greg |
2.10 |
for (j = 0; j < dp->dim[i].ne; j++) |
| 162 |
greg |
2.15 |
if (fgetval(fp, DATATY, |
| 163 |
|
|
(char *)&dp->dim[i].p[j]) <= 0) |
| 164 |
greg |
1.4 |
goto scanerr; |
| 165 |
|
|
for (j = 1; j < dp->dim[i].ne-1; j++) |
| 166 |
|
|
if ((dp->dim[i].p[j-1] < dp->dim[i].p[j]) != |
| 167 |
|
|
(dp->dim[i].p[j] < dp->dim[i].p[j+1])) |
| 168 |
|
|
goto scanerr; |
| 169 |
|
|
dp->dim[i].org = dp->dim[i].p[0]; |
| 170 |
|
|
dp->dim[i].siz = dp->dim[i].p[dp->dim[i].ne-1] |
| 171 |
|
|
- dp->dim[i].p[0]; |
| 172 |
|
|
} else |
| 173 |
greg |
1.6 |
dp->dim[i].p = NULL; |
| 174 |
greg |
1.1 |
} |
| 175 |
greg |
2.12 |
if ((dp->arr.d = (DATATYPE *)malloc(asize*sizeof(DATATYPE))) == NULL) |
| 176 |
greg |
1.1 |
goto memerr; |
| 177 |
|
|
|
| 178 |
greg |
2.10 |
for (i = 0; i < asize; i++) |
| 179 |
greg |
2.15 |
if (fgetval(fp, DATATY, (char *)&dp->arr.d[i]) <= 0) |
| 180 |
greg |
1.1 |
goto scanerr; |
| 181 |
|
|
fclose(fp); |
| 182 |
greg |
2.6 |
i = hash(dname); |
| 183 |
|
|
dp->next = dtab[i]; |
| 184 |
|
|
return(dtab[i] = dp); |
| 185 |
greg |
1.1 |
|
| 186 |
|
|
memerr: |
| 187 |
|
|
error(SYSTEM, "out of memory in getdata"); |
| 188 |
|
|
scanerr: |
| 189 |
|
|
sprintf(errmsg, "%s in data file \"%s\"", |
| 190 |
|
|
feof(fp) ? "unexpected EOF" : "bad format", dfname); |
| 191 |
|
|
error(USER, errmsg); |
| 192 |
|
|
} |
| 193 |
|
|
|
| 194 |
|
|
|
| 195 |
greg |
2.15 |
static int |
| 196 |
greg |
2.4 |
headaspect(s, iap) /* check string for aspect ratio */ |
| 197 |
greg |
1.5 |
char *s; |
| 198 |
greg |
2.4 |
double *iap; |
| 199 |
greg |
1.5 |
{ |
| 200 |
gwlarson |
2.14 |
char fmt[32]; |
| 201 |
|
|
|
| 202 |
greg |
1.5 |
if (isaspect(s)) |
| 203 |
greg |
2.4 |
*iap *= aspectval(s); |
| 204 |
greg |
2.15 |
else if (formatval(fmt, s) && !globmatch(PICFMT, fmt)) |
| 205 |
gwlarson |
2.14 |
*iap = 0.0; |
| 206 |
|
|
return(0); |
| 207 |
greg |
1.5 |
} |
| 208 |
|
|
|
| 209 |
|
|
|
| 210 |
greg |
1.1 |
DATARRAY * |
| 211 |
|
|
getpict(pname) /* get picture pname */ |
| 212 |
|
|
char *pname; |
| 213 |
|
|
{ |
| 214 |
greg |
2.4 |
double inpaspect; |
| 215 |
greg |
1.1 |
char *pfname; |
| 216 |
|
|
FILE *fp; |
| 217 |
greg |
2.12 |
COLR *scanin; |
| 218 |
greg |
1.11 |
int sl, ns; |
| 219 |
greg |
2.3 |
RESOLU inpres; |
| 220 |
greg |
1.11 |
FLOAT loc[2]; |
| 221 |
|
|
int y; |
| 222 |
|
|
register int x, i; |
| 223 |
greg |
1.1 |
register DATARRAY *pp; |
| 224 |
|
|
/* look for array in list */ |
| 225 |
greg |
2.12 |
for (pp = dtab[hash(pname)]; pp != NULL; pp = pp->next) |
| 226 |
greg |
1.1 |
if (!strcmp(pname, pp->name)) |
| 227 |
|
|
return(pp); /* found! */ |
| 228 |
|
|
|
| 229 |
greg |
2.8 |
if ((pfname = getpath(pname, getlibpath(), R_OK)) == NULL) { |
| 230 |
greg |
1.1 |
sprintf(errmsg, "cannot find picture file \"%s\"", pname); |
| 231 |
|
|
error(USER, errmsg); |
| 232 |
|
|
} |
| 233 |
greg |
2.12 |
if ((pp = (DATARRAY *)malloc(3*sizeof(DATARRAY))) == NULL) |
| 234 |
greg |
1.1 |
goto memerr; |
| 235 |
|
|
|
| 236 |
greg |
2.12 |
pp[0].name = savestr(pname); |
| 237 |
greg |
1.1 |
|
| 238 |
|
|
if ((fp = fopen(pfname, "r")) == NULL) { |
| 239 |
|
|
sprintf(errmsg, "cannot open picture file \"%s\"", pfname); |
| 240 |
|
|
error(SYSTEM, errmsg); |
| 241 |
|
|
} |
| 242 |
greg |
2.3 |
#ifdef MSDOS |
| 243 |
|
|
setmode(fileno(fp), O_BINARY); |
| 244 |
|
|
#endif |
| 245 |
greg |
1.1 |
/* get dimensions */ |
| 246 |
greg |
1.5 |
inpaspect = 1.0; |
| 247 |
greg |
2.15 |
getheader(fp, headaspect, (char *)&inpaspect); |
| 248 |
gwlarson |
2.14 |
if (inpaspect <= FTINY || !fgetsresolu(&inpres, fp)) |
| 249 |
greg |
1.1 |
goto readerr; |
| 250 |
greg |
2.12 |
pp[0].nd = 2; |
| 251 |
|
|
pp[0].dim[0].ne = inpres.yr; |
| 252 |
|
|
pp[0].dim[1].ne = inpres.xr; |
| 253 |
|
|
pp[0].dim[0].org = |
| 254 |
|
|
pp[0].dim[1].org = 0.0; |
| 255 |
|
|
if (inpres.xr <= inpres.yr*inpaspect) { |
| 256 |
|
|
pp[0].dim[0].siz = inpaspect * |
| 257 |
|
|
(double)inpres.yr/inpres.xr; |
| 258 |
|
|
pp[0].dim[1].siz = 1.0; |
| 259 |
|
|
} else { |
| 260 |
|
|
pp[0].dim[0].siz = 1.0; |
| 261 |
|
|
pp[0].dim[1].siz = (double)inpres.xr/inpres.yr / |
| 262 |
|
|
inpaspect; |
| 263 |
|
|
} |
| 264 |
|
|
pp[0].dim[0].p = pp[0].dim[1].p = NULL; |
| 265 |
|
|
sl = scanlen(&inpres); /* allocate array */ |
| 266 |
|
|
ns = numscans(&inpres); |
| 267 |
|
|
i = ns*sl*sizeof(COLR); |
| 268 |
greg |
2.7 |
#if PSIZWARN |
| 269 |
greg |
2.12 |
if (i > PSIZWARN) { /* memory warning */ |
| 270 |
greg |
2.7 |
sprintf(errmsg, "picture file \"%s\" using %d bytes of memory", |
| 271 |
|
|
pname, i); |
| 272 |
|
|
error(WARNING, errmsg); |
| 273 |
|
|
} |
| 274 |
|
|
#endif |
| 275 |
greg |
2.12 |
if ((pp[0].arr.c = (COLR *)malloc(i)) == NULL) |
| 276 |
|
|
goto memerr; |
| 277 |
greg |
1.1 |
/* load picture */ |
| 278 |
greg |
2.12 |
if ((scanin = (COLR *)malloc(sl*sizeof(COLR))) == NULL) |
| 279 |
greg |
1.1 |
goto memerr; |
| 280 |
greg |
1.11 |
for (y = 0; y < ns; y++) { |
| 281 |
greg |
2.12 |
if (freadcolrs(scanin, sl, fp) < 0) |
| 282 |
greg |
1.1 |
goto readerr; |
| 283 |
greg |
1.11 |
for (x = 0; x < sl; x++) { |
| 284 |
|
|
pix2loc(loc, &inpres, x, y); |
| 285 |
|
|
i = (int)(loc[1]*inpres.yr)*inpres.xr + |
| 286 |
|
|
(int)(loc[0]*inpres.xr); |
| 287 |
greg |
2.12 |
copycolr(pp[0].arr.c[i], scanin[x]); |
| 288 |
greg |
1.11 |
} |
| 289 |
greg |
1.1 |
} |
| 290 |
greg |
2.15 |
free((void *)scanin); |
| 291 |
greg |
1.1 |
fclose(fp); |
| 292 |
greg |
2.6 |
i = hash(pname); |
| 293 |
greg |
2.12 |
pp[0].next = dtab[i]; /* link into picture list */ |
| 294 |
|
|
copystruct(&pp[1], &pp[0]); |
| 295 |
|
|
copystruct(&pp[2], &pp[0]); |
| 296 |
|
|
pp[0].type = RED; /* differentiate RGB records */ |
| 297 |
|
|
pp[1].type = GRN; |
| 298 |
|
|
pp[2].type = BLU; |
| 299 |
|
|
return(dtab[i] = pp); |
| 300 |
greg |
1.1 |
|
| 301 |
|
|
memerr: |
| 302 |
|
|
error(SYSTEM, "out of memory in getpict"); |
| 303 |
|
|
readerr: |
| 304 |
|
|
sprintf(errmsg, "bad picture file \"%s\"", pfname); |
| 305 |
|
|
error(USER, errmsg); |
| 306 |
|
|
} |
| 307 |
|
|
|
| 308 |
|
|
|
| 309 |
greg |
2.15 |
void |
| 310 |
|
|
freedata(dta) /* release data array reference */ |
| 311 |
|
|
DATARRAY *dta; |
| 312 |
greg |
1.1 |
{ |
| 313 |
greg |
2.5 |
DATARRAY head; |
| 314 |
greg |
2.6 |
int hval, nents; |
| 315 |
greg |
2.15 |
register DATARRAY *dpl, *dp; |
| 316 |
greg |
1.4 |
register int i; |
| 317 |
greg |
1.1 |
|
| 318 |
greg |
2.15 |
if (dta == NULL) { /* free all if NULL */ |
| 319 |
greg |
2.6 |
hval = 0; nents = TABSIZ; |
| 320 |
|
|
} else { |
| 321 |
greg |
2.15 |
hval = hash(dta->name); nents = 1; |
| 322 |
greg |
2.6 |
} |
| 323 |
|
|
while (nents--) { |
| 324 |
|
|
head.next = dtab[hval]; |
| 325 |
|
|
dpl = &head; |
| 326 |
|
|
while ((dp = dpl->next) != NULL) |
| 327 |
greg |
2.15 |
if ((dta == NULL | dta == dp)) { |
| 328 |
greg |
2.6 |
dpl->next = dp->next; |
| 329 |
greg |
2.12 |
if (dp->type == DATATY) |
| 330 |
greg |
2.15 |
free((void *)dp->arr.d); |
| 331 |
greg |
2.12 |
else |
| 332 |
greg |
2.15 |
free((void *)dp->arr.c); |
| 333 |
greg |
2.6 |
for (i = 0; i < dp->nd; i++) |
| 334 |
|
|
if (dp->dim[i].p != NULL) |
| 335 |
greg |
2.15 |
free((void *)dp->dim[i].p); |
| 336 |
greg |
2.6 |
freestr(dp->name); |
| 337 |
greg |
2.15 |
free((void *)dp); |
| 338 |
greg |
2.6 |
} else |
| 339 |
|
|
dpl = dp; |
| 340 |
|
|
dtab[hval++] = head.next; |
| 341 |
|
|
} |
| 342 |
greg |
1.1 |
} |
| 343 |
|
|
|
| 344 |
|
|
|
| 345 |
|
|
double |
| 346 |
|
|
datavalue(dp, pt) /* interpolate data value at a point */ |
| 347 |
|
|
register DATARRAY *dp; |
| 348 |
greg |
2.3 |
double *pt; |
| 349 |
greg |
1.1 |
{ |
| 350 |
|
|
DATARRAY sd; |
| 351 |
|
|
int asize; |
| 352 |
greg |
1.6 |
int lower, upper; |
| 353 |
greg |
1.1 |
register int i; |
| 354 |
greg |
2.9 |
double x, y0, y1; |
| 355 |
greg |
1.4 |
/* set up dimensions for recursion */ |
| 356 |
greg |
2.12 |
if (dp->nd > 1) { |
| 357 |
|
|
sd.name = dp->name; |
| 358 |
|
|
sd.type = dp->type; |
| 359 |
|
|
sd.nd = dp->nd - 1; |
| 360 |
|
|
asize = 1; |
| 361 |
|
|
for (i = 0; i < sd.nd; i++) { |
| 362 |
|
|
sd.dim[i].org = dp->dim[i+1].org; |
| 363 |
|
|
sd.dim[i].siz = dp->dim[i+1].siz; |
| 364 |
|
|
sd.dim[i].p = dp->dim[i+1].p; |
| 365 |
|
|
asize *= sd.dim[i].ne = dp->dim[i+1].ne; |
| 366 |
|
|
} |
| 367 |
greg |
1.1 |
} |
| 368 |
greg |
1.4 |
/* get independent variable */ |
| 369 |
|
|
if (dp->dim[0].p == NULL) { /* evenly spaced points */ |
| 370 |
|
|
x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz; |
| 371 |
greg |
2.9 |
x *= (double)(dp->dim[0].ne - 1); |
| 372 |
greg |
1.4 |
i = x; |
| 373 |
|
|
if (i < 0) |
| 374 |
|
|
i = 0; |
| 375 |
|
|
else if (i > dp->dim[0].ne - 2) |
| 376 |
|
|
i = dp->dim[0].ne - 2; |
| 377 |
|
|
} else { /* unevenly spaced points */ |
| 378 |
greg |
1.6 |
if (dp->dim[0].siz > 0.0) { |
| 379 |
|
|
lower = 0; |
| 380 |
|
|
upper = dp->dim[0].ne; |
| 381 |
|
|
} else { |
| 382 |
|
|
lower = dp->dim[0].ne; |
| 383 |
|
|
upper = 0; |
| 384 |
|
|
} |
| 385 |
|
|
do { |
| 386 |
|
|
i = (lower + upper) >> 1; |
| 387 |
|
|
if (pt[0] >= dp->dim[0].p[i]) |
| 388 |
|
|
lower = i; |
| 389 |
greg |
1.8 |
else |
| 390 |
greg |
1.6 |
upper = i; |
| 391 |
|
|
} while (i != (lower + upper) >> 1); |
| 392 |
greg |
1.8 |
if (i > dp->dim[0].ne - 2) |
| 393 |
greg |
1.4 |
i = dp->dim[0].ne - 2; |
| 394 |
|
|
x = i + (pt[0] - dp->dim[0].p[i]) / |
| 395 |
|
|
(dp->dim[0].p[i+1] - dp->dim[0].p[i]); |
| 396 |
|
|
} |
| 397 |
|
|
/* get dependent variable */ |
| 398 |
greg |
2.12 |
if (dp->nd > 1) { |
| 399 |
|
|
if (dp->type == DATATY) { |
| 400 |
|
|
sd.arr.d = dp->arr.d + i*asize; |
| 401 |
|
|
y0 = datavalue(&sd, pt+1); |
| 402 |
|
|
sd.arr.d = dp->arr.d + (i+1)*asize; |
| 403 |
|
|
y1 = datavalue(&sd, pt+1); |
| 404 |
|
|
} else { |
| 405 |
|
|
sd.arr.c = dp->arr.c + i*asize; |
| 406 |
|
|
y0 = datavalue(&sd, pt+1); |
| 407 |
|
|
sd.arr.c = dp->arr.c + (i+1)*asize; |
| 408 |
|
|
y1 = datavalue(&sd, pt+1); |
| 409 |
|
|
} |
| 410 |
greg |
1.1 |
} else { |
| 411 |
greg |
2.12 |
if (dp->type == DATATY) { |
| 412 |
|
|
y0 = dp->arr.d[i]; |
| 413 |
|
|
y1 = dp->arr.d[i+1]; |
| 414 |
|
|
} else { |
| 415 |
|
|
y0 = colrval(dp->arr.c[i],dp->type); |
| 416 |
|
|
y1 = colrval(dp->arr.c[i+1],dp->type); |
| 417 |
|
|
} |
| 418 |
greg |
1.1 |
} |
| 419 |
|
|
/* |
| 420 |
|
|
* Extrapolate as far as one division, then |
| 421 |
|
|
* taper off harmonically to zero. |
| 422 |
|
|
*/ |
| 423 |
|
|
if (x > i+2) |
| 424 |
greg |
2.9 |
return( (2*y1-y0)/(x-(i-1)) ); |
| 425 |
greg |
1.1 |
|
| 426 |
greg |
2.9 |
if (x < i-1) |
| 427 |
|
|
return( (2*y0-y1)/(i-x) ); |
| 428 |
|
|
|
| 429 |
|
|
return( y0*((i+1)-x) + y1*(x-i) ); |
| 430 |
greg |
1.1 |
} |
