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greg |
1.1 |
/* Copyright (c) 1986 Regents of the University of California */
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#ifndef lint
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static char SCCSid[] = "$SunId$ LBL";
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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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* 6/4/86
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*/
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#include "standard.h"
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#include "color.h"
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#include "data.h"
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extern char *libpath; /* library search path */
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static DATARRAY *dlist = NULL; /* data array list */
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static DATARRAY *plist = NULL; /* picture list */
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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;
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register DATARRAY *dp;
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/* look for array in list */
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for (dp = dlist; 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 directorys 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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* #dimensions
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* beg0 end0 n0
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* beg1 end1 n1
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* . . .
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* data, later dimensions changing faster
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* . . .
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*
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*/
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greg |
1.2 |
if ((dfname = getpath(dname, libpath, R_OK)) == NULL) {
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greg |
1.1 |
sprintf(errmsg, "cannot find data file \"%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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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 (fscanf(fp, "%d", &dp->nd) != 1)
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goto scanerr;
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if (dp->nd <= 0 || dp->nd > MAXDIM) {
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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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asize = 1;
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for (i = 0; i < dp->nd; i++) {
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if (fscanf(fp, "%lf %lf %d",
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&dp->dim[i].org, &dp->dim[i].siz,
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&dp->dim[i].ne) != 3)
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goto scanerr;
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dp->dim[i].siz -= dp->dim[i].org;
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asize *= dp->dim[i].ne;
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}
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if ((dp->arr = (DATATYPE *)malloc(asize*sizeof(DATATYPE))) == NULL)
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goto memerr;
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for (i = 0; i < asize; i++)
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if (fscanf(fp, DSCANF, &dp->arr[i]) != 1)
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goto scanerr;
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fclose(fp);
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dp->next = dlist;
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return(dlist = dp);
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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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DATARRAY *
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getpict(pname) /* get picture pname */
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char *pname;
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{
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extern char *libpath;
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char *pfname;
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FILE *fp;
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COLOR *scanin;
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int width, height;
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int x, y;
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register int i;
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register DATARRAY *pp;
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/* look for array in list */
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for (pp = plist; 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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greg |
1.2 |
if ((pfname = getpath(pname, libpath, R_OK)) == NULL) {
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greg |
1.1 |
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 *)calloc(3, sizeof(DATARRAY))) == NULL)
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goto memerr;
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pp[0].name =
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pp[1].name =
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pp[2].name = savestr(pname);
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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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/* get dimensions */
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getheader(fp, NULL);
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greg |
1.3 |
if (fgetresolu(&width, &height, fp) != (YMAJOR|YDECR))
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greg |
1.1 |
goto readerr;
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for (i = 0; i < 3; i++) {
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pp[i].nd = 2;
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pp[i].dim[0].ne = width;
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pp[i].dim[1].ne = height;
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pp[i].dim[0].org =
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pp[i].dim[1].org = 0.0;
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if (width <= height) {
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pp[i].dim[0].siz = 1.0;
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pp[i].dim[1].siz = (double)height/width;
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} else {
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pp[i].dim[0].siz = (double)width/height;
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pp[i].dim[1].siz = 1.0;
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}
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pp[i].arr = (DATATYPE *)malloc(width*height*sizeof(DATATYPE));
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if (pp[i].arr == NULL)
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goto memerr;
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}
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/* load picture */
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if ((scanin = (COLOR *)malloc(width*sizeof(COLOR))) == NULL)
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goto memerr;
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for (y = height-1; y >= 0; y--) {
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if (freadscan(scanin, width, fp) < 0)
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goto readerr;
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for (x = 0; x < width; x++)
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for (i = 0; i < 3; i++)
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pp[i].arr[x*height+y] = colval(scanin[x],i);
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}
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free((char *)scanin);
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fclose(fp);
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pp[0].next =
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pp[1].next =
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pp[2].next = plist;
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return(plist = pp);
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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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freedata(dname) /* free memory associated with dname */
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char *dname;
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{
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register DATARRAY *dp, *dpl;
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for (dpl = NULL, dp = dlist; dp != NULL; dpl = dp, dp = dp->next)
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if (!strcmp(dname, dp->name)) {
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if (dpl == NULL)
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dlist = dp->next;
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else
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dpl->next = dp->next;
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free((char *)dp->arr);
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freestr(dp->name);
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free((char *)dp);
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return;
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}
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}
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freepict(pname) /* free memory associated with pname */
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char *pname;
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{
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register DATARRAY *pp, *ppl;
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for (ppl = NULL, pp = plist; pp != NULL; ppl = pp, pp = pp->next)
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if (!strcmp(pname, pp->name)) {
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if (ppl == NULL)
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plist = pp->next;
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else
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ppl->next = pp->next;
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free((char *)pp[0].arr);
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free((char *)pp[1].arr);
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free((char *)pp[2].arr);
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freestr(pp[0].name);
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free((char *)pp);
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return;
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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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register int i;
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double x, y, y0, y1;
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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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asize *= sd.dim[i].ne = dp->dim[i+1].ne;
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}
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x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz;
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x *= 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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if (dp->nd == 1) {
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y0 = dp->arr[i];
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y1 = dp->arr[i+1];
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} else {
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sd.arr = &dp->arr[i*asize];
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y0 = datavalue(&sd, pt+1);
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sd.arr = &dp->arr[(i+1)*asize];
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y1 = datavalue(&sd, pt+1);
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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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y = (2*y1-y0)/(x-i-1);
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else if (x < i-1)
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y = (2*y0-y1)/(i-x);
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else
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y = y0*((i+1)-x) + y1*(x-i);
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return(y);
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}
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