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/* Copyright (c) 1986 Regents of the University of California */ |
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|
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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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/* |
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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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|
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#include "standard.h" |
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|
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#include "color.h" |
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|
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#include "data.h" |
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|
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|
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extern char *libpath; /* library search path */ |
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|
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static DATARRAY *dlist = NULL; /* data array list */ |
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|
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static DATARRAY *plist = NULL; /* picture list */ |
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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 = 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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/* |
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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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* 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, libpath, 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 ((dp = (DATARRAY *)malloc(sizeof(DATARRAY))) == NULL) |
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goto memerr; |
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|
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dp->name = savestr(dname); |
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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 (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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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 = (double *)malloc(dp->dim[i].ne*sizeof(double)); |
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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 (fscanf(fp, "%lf", &dp->dim[i].p[j]) != 1) |
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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 = (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 (fscanf(fp, DSCANF, &dp->arr[i]) != 1) |
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goto scanerr; |
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|
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fclose(fp); |
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dp->next = dlist; |
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return(dlist = 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 double inpaspect; /* aspect ratio of input picture */ |
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|
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static |
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headaspect(s) /* check string for aspect ratio */ |
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char *s; |
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{ |
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if (isaspect(s)) |
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inpaspect *= aspectval(s); |
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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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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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|
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if ((pfname = getpath(pname, libpath, 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 *)calloc(3, sizeof(DATARRAY))) == NULL) |
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goto memerr; |
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|
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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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|
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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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inpaspect = 1.0; |
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getheader(fp, headaspect); |
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if (fgetresolu(&width, &height, fp) != (YMAJOR|YDECR)) |
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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*inpaspect) { |
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pp[i].dim[0].siz = 1.0; |
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pp[i].dim[1].siz = inpaspect*(double)height/width; |
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} else { |
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pp[i].dim[0].siz = (double)width/height/inpaspect; |
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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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|
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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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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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register int i; |
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|
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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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for (i = 0; i < dp->nd; i++) |
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if (dp->dim[i].p != NULL) |
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free((char *)dp->dim[i].p); |
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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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|
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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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|
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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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|
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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, y, y0, y1; |
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/* set up dimensions for recursion */ |
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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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/* 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 = 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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} 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 if (pt[0] < dp->dim[0].p[i]) |
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upper = i; |
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} while (i != (lower + upper) >> 1); |
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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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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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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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|
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return(y); |
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} |
