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#ifndef lint |
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static const char RCSid[] = "$Id: data.c,v 2.25 2003/10/22 02:06:35 greg Exp $"; |
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#endif |
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/* |
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* data.c - routines dealing with interpolated data. |
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*/ |
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|
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#include "copyright.h" |
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|
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#include <time.h> |
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|
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#include "platform.h" |
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#include "standard.h" |
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#include "color.h" |
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#include "resolu.h" |
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#include "data.h" |
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|
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/* picture memory usage before warning */ |
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#ifndef PSIZWARN |
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#ifdef SMLMEM |
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#define PSIZWARN 1500000 |
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#else |
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#define PSIZWARN 5000000 |
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#endif |
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#endif |
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|
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#ifndef TABSIZ |
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#define TABSIZ 97 /* table size (prime) */ |
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#endif |
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|
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#define hash(s) (shash(s)%TABSIZ) |
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|
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|
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static DATARRAY *dtab[TABSIZ]; /* data array list */ |
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|
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static gethfunc headaspect; |
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|
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|
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DATARRAY * |
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getdata(dname) /* get data array dname */ |
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char *dname; |
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{ |
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char *dfname; |
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FILE *fp; |
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int asize; |
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register int i, j; |
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register DATARRAY *dp; |
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/* look for array in list */ |
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for (dp = dtab[hash(dname)]; dp != NULL; dp = dp->next) |
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if (!strcmp(dname, dp->name)) |
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return(dp); /* found! */ |
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/* |
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* If we haven't loaded the data already, we will look |
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* for it in the directories specified by the library path. |
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* |
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* The file has the following format: |
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* |
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* N |
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* beg0 end0 n0 |
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* beg1 end1 n1 |
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* . . . |
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* begN endN nN |
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* data, later dimensions changing faster |
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* . . . |
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* |
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* For irregularly spaced points, the following can be |
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* substituted for begi endi ni: |
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* |
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* 0 0 ni p0i p1i .. pni |
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*/ |
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|
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if ((dfname = getpath(dname, getrlibpath(), R_OK)) == NULL) { |
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sprintf(errmsg, "cannot find data file \"%s\"", dname); |
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error(USER, errmsg); |
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} |
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if ((fp = fopen(dfname, "r")) == NULL) { |
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sprintf(errmsg, "cannot open data file \"%s\"", dfname); |
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error(SYSTEM, errmsg); |
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} |
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/* get dimensions */ |
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if (fgetval(fp, 'i', (char *)&asize) <= 0) |
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goto scanerr; |
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if ((asize <= 0) | (asize > MAXDDIM)) { |
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sprintf(errmsg, "bad number of dimensions for \"%s\"", dname); |
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error(USER, errmsg); |
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} |
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if ((dp = (DATARRAY *)malloc(sizeof(DATARRAY))) == NULL) |
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goto memerr; |
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dp->name = savestr(dname); |
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dp->type = DATATY; |
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dp->nd = asize; |
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asize = 1; |
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for (i = 0; i < dp->nd; i++) { |
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if (fgetval(fp, DATATY, (char *)&dp->dim[i].org) <= 0) |
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goto scanerr; |
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if (fgetval(fp, DATATY, (char *)&dp->dim[i].siz) <= 0) |
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goto scanerr; |
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if (fgetval(fp, 'i', (char *)&dp->dim[i].ne) <= 0) |
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goto scanerr; |
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if (dp->dim[i].ne < 2) |
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goto scanerr; |
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asize *= dp->dim[i].ne; |
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if ((dp->dim[i].siz -= dp->dim[i].org) == 0) { |
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dp->dim[i].p = (DATATYPE *) |
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malloc(dp->dim[i].ne*sizeof(DATATYPE)); |
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if (dp->dim[i].p == NULL) |
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goto memerr; |
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for (j = 0; j < dp->dim[i].ne; j++) |
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if (fgetval(fp, DATATY, |
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(char *)&dp->dim[i].p[j]) <= 0) |
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goto scanerr; |
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for (j = 1; j < dp->dim[i].ne-1; j++) |
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if ((dp->dim[i].p[j-1] < dp->dim[i].p[j]) != |
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(dp->dim[i].p[j] < dp->dim[i].p[j+1])) |
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goto scanerr; |
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dp->dim[i].org = dp->dim[i].p[0]; |
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dp->dim[i].siz = dp->dim[i].p[dp->dim[i].ne-1] |
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- dp->dim[i].p[0]; |
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} else |
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dp->dim[i].p = NULL; |
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} |
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if ((dp->arr.d = (DATATYPE *)malloc(asize*sizeof(DATATYPE))) == NULL) |
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goto memerr; |
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|
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for (i = 0; i < asize; i++) |
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if (fgetval(fp, DATATY, (char *)&dp->arr.d[i]) <= 0) |
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goto scanerr; |
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fclose(fp); |
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i = hash(dname); |
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dp->next = dtab[i]; |
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return(dtab[i] = dp); |
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|
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memerr: |
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error(SYSTEM, "out of memory in getdata"); |
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scanerr: |
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sprintf(errmsg, "%s in data file \"%s\"", |
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feof(fp) ? "unexpected EOF" : "bad format", dfname); |
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error(USER, errmsg); |
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} |
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|
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|
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static int |
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headaspect( /* check string for aspect ratio */ |
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char *s, |
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void *iap |
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) |
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{ |
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char fmt[32]; |
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|
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if (isaspect(s)) |
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*(double*)iap *= aspectval(s); |
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else if (formatval(fmt, s) && !globmatch(PICFMT, fmt)) |
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*(double*)iap = 0.0; |
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return(0); |
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} |
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|
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|
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DATARRAY * |
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getpict(pname) /* get picture pname */ |
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char *pname; |
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{ |
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double inpaspect; |
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char *pfname; |
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FILE *fp; |
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COLR *scanin; |
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int sl, ns; |
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RESOLU inpres; |
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RREAL loc[2]; |
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int y; |
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register int x, i; |
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register DATARRAY *pp; |
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/* look for array in list */ |
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for (pp = dtab[hash(pname)]; pp != NULL; pp = pp->next) |
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if (!strcmp(pname, pp->name)) |
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return(pp); /* found! */ |
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|
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if ((pfname = getpath(pname, getrlibpath(), R_OK)) == NULL) { |
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sprintf(errmsg, "cannot find picture file \"%s\"", pname); |
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error(USER, errmsg); |
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} |
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if ((pp = (DATARRAY *)malloc(3*sizeof(DATARRAY))) == NULL) |
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goto memerr; |
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|
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pp[0].name = savestr(pname); |
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|
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if ((fp = fopen(pfname, "r")) == NULL) { |
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sprintf(errmsg, "cannot open picture file \"%s\"", pfname); |
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error(SYSTEM, errmsg); |
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} |
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SET_FILE_BINARY(fp); |
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/* get dimensions */ |
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inpaspect = 1.0; |
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getheader(fp, headaspect, &inpaspect); |
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if (inpaspect <= FTINY || !fgetsresolu(&inpres, fp)) |
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goto readerr; |
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pp[0].nd = 2; |
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pp[0].dim[0].ne = inpres.yr; |
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pp[0].dim[1].ne = inpres.xr; |
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pp[0].dim[0].org = |
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pp[0].dim[1].org = 0.0; |
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if (inpres.xr <= inpres.yr*inpaspect) { |
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pp[0].dim[0].siz = inpaspect * |
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(double)inpres.yr/inpres.xr; |
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pp[0].dim[1].siz = 1.0; |
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} else { |
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pp[0].dim[0].siz = 1.0; |
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pp[0].dim[1].siz = (double)inpres.xr/inpres.yr / |
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inpaspect; |
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} |
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pp[0].dim[0].p = pp[0].dim[1].p = NULL; |
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sl = scanlen(&inpres); /* allocate array */ |
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ns = numscans(&inpres); |
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i = ns*sl*sizeof(COLR); |
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#if PSIZWARN |
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if (i > PSIZWARN) { /* memory warning */ |
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sprintf(errmsg, "picture file \"%s\" using %d bytes of memory", |
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pname, i); |
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error(WARNING, errmsg); |
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} |
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#endif |
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if ((pp[0].arr.c = (COLR *)malloc(i)) == NULL) |
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goto memerr; |
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/* load picture */ |
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if ((scanin = (COLR *)malloc(sl*sizeof(COLR))) == NULL) |
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goto memerr; |
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for (y = 0; y < ns; y++) { |
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if (freadcolrs(scanin, sl, fp) < 0) |
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goto readerr; |
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for (x = 0; x < sl; x++) { |
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pix2loc(loc, &inpres, x, y); |
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i = (int)(loc[1]*inpres.yr)*inpres.xr + |
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(int)(loc[0]*inpres.xr); |
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copycolr(pp[0].arr.c[i], scanin[x]); |
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} |
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} |
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free((void *)scanin); |
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fclose(fp); |
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i = hash(pname); |
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pp[0].next = dtab[i]; /* link into picture list */ |
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pp[1] = pp[0]; |
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pp[2] = pp[0]; |
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pp[0].type = RED; /* differentiate RGB records */ |
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pp[1].type = GRN; |
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pp[2].type = BLU; |
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return(dtab[i] = pp); |
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|
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memerr: |
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error(SYSTEM, "out of memory in getpict"); |
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readerr: |
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sprintf(errmsg, "bad picture file \"%s\"", pfname); |
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error(USER, errmsg); |
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} |
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|
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|
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void |
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freedata(dta) /* release data array reference */ |
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DATARRAY *dta; |
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{ |
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DATARRAY head; |
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int hval, nents; |
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register DATARRAY *dpl, *dp; |
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register int i; |
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|
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if (dta == NULL) { /* free all if NULL */ |
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hval = 0; nents = TABSIZ; |
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} else { |
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hval = hash(dta->name); nents = 1; |
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} |
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while (nents--) { |
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head.next = dtab[hval]; |
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dpl = &head; |
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while ((dp = dpl->next) != NULL) |
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if ((dta == NULL) | (dta == dp)) { |
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dpl->next = dp->next; |
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if (dp->type == DATATY) |
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free((void *)dp->arr.d); |
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else |
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free((void *)dp->arr.c); |
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for (i = 0; i < dp->nd; i++) |
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if (dp->dim[i].p != NULL) |
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free((void *)dp->dim[i].p); |
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freestr(dp->name); |
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free((void *)dp); |
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} else |
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dpl = dp; |
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dtab[hval++] = head.next; |
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} |
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} |
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|
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|
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double |
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datavalue(dp, pt) /* interpolate data value at a point */ |
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register DATARRAY *dp; |
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double *pt; |
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{ |
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DATARRAY sd; |
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int asize; |
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int lower, upper; |
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register int i; |
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double x, y0, y1; |
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/* set up dimensions for recursion */ |
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if (dp->nd > 1) { |
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sd.name = dp->name; |
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sd.type = dp->type; |
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sd.nd = dp->nd - 1; |
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asize = 1; |
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for (i = 0; i < sd.nd; i++) { |
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sd.dim[i].org = dp->dim[i+1].org; |
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sd.dim[i].siz = dp->dim[i+1].siz; |
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sd.dim[i].p = dp->dim[i+1].p; |
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asize *= sd.dim[i].ne = dp->dim[i+1].ne; |
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} |
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} |
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/* get independent variable */ |
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if (dp->dim[0].p == NULL) { /* evenly spaced points */ |
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x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz; |
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x *= (double)(dp->dim[0].ne - 1); |
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i = x; |
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if (i < 0) |
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i = 0; |
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else if (i > dp->dim[0].ne - 2) |
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i = dp->dim[0].ne - 2; |
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} else { /* unevenly spaced points */ |
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if (dp->dim[0].siz > 0.0) { |
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lower = 0; |
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upper = dp->dim[0].ne; |
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} else { |
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lower = dp->dim[0].ne; |
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upper = 0; |
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} |
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do { |
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i = (lower + upper) >> 1; |
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if (pt[0] >= dp->dim[0].p[i]) |
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lower = i; |
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else |
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upper = i; |
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} while (i != (lower + upper) >> 1); |
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if (i > dp->dim[0].ne - 2) |
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i = dp->dim[0].ne - 2; |
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x = i + (pt[0] - dp->dim[0].p[i]) / |
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(dp->dim[0].p[i+1] - dp->dim[0].p[i]); |
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} |
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/* get dependent variable */ |
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if (dp->nd > 1) { |
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if (dp->type == DATATY) { |
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sd.arr.d = dp->arr.d + i*asize; |
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y0 = datavalue(&sd, pt+1); |
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sd.arr.d = dp->arr.d + (i+1)*asize; |
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y1 = datavalue(&sd, pt+1); |
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} else { |
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sd.arr.c = dp->arr.c + i*asize; |
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y0 = datavalue(&sd, pt+1); |
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sd.arr.c = dp->arr.c + (i+1)*asize; |
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y1 = datavalue(&sd, pt+1); |
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} |
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} else { |
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if (dp->type == DATATY) { |
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y0 = dp->arr.d[i]; |
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y1 = dp->arr.d[i+1]; |
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} else { |
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y0 = colrval(dp->arr.c[i],dp->type); |
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y1 = colrval(dp->arr.c[i+1],dp->type); |
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} |
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} |
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/* |
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* Extrapolate as far as one division, then |
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* taper off harmonically to zero. |
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*/ |
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if (x > i+2) |
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return( (2*y1-y0)/(x-(i-1)) ); |
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|
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if (x < i-1) |
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return( (2*y0-y1)/(i-x) ); |
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|
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return( y0*((i+1)-x) + y1*(x-i) ); |
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} |
