src/rt/data.c

/* Copyright (c) 1986 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  data.c - routines dealing with interpolated data.
 *
 *     6/4/86
 */

#include  "standard.h"

#include  "color.h"

#include  "data.h"


extern char  *libpath;                  /* library search path */

static DATARRAY  *dlist = NULL;         /* data array list */

static DATARRAY  *plist = NULL;         /* picture list */


DATARRAY *
getdata(dname)                          /* get data array dname */
char  *dname;
{
        char  *dfname;
        FILE  *fp;
        int  asize;
        register int  i;
        register DATARRAY  *dp;
                                                /* look for array in list */
        for (dp = dlist; dp != NULL; dp = dp->next)
                if (!strcmp(dname, dp->name))
                        return(dp);             /* found! */

        /*
         *      If we haven't loaded the data already, we will look
         *  for it in the directorys specified by the library path.
         *
         *      The file has the following format:
         *
         *              #dimensions
         *              beg0    end0    n0
         *              beg1    end1    n1
         *              . . .
         *              data, later dimensions changing faster
         *              . . .
         *
         */

        if ((dfname = getpath(dname, libpath, R_OK)) == NULL) {
                sprintf(errmsg, "cannot find data file \"%s\"", dname);
                error(USER, errmsg);
        }
        if ((dp = (DATARRAY *)malloc(sizeof(DATARRAY))) == NULL)
                goto memerr;

        dp->name = savestr(dname);

        if ((fp = fopen(dfname, "r")) == NULL) {
                sprintf(errmsg, "cannot open data file \"%s\"", dfname);
                error(SYSTEM, errmsg);
        }
                                                        /* get dimensions */
        if (fscanf(fp, "%d", &dp->nd) != 1)
                goto scanerr;
        if (dp->nd <= 0 || dp->nd > MAXDIM) {
                sprintf(errmsg, "bad number of dimensions for \"%s\"", dname);
                error(USER, errmsg);
        }
        asize = 1;
        for (i = 0; i < dp->nd; i++) {
                if (fscanf(fp, "%lf %lf %d",
                                &dp->dim[i].org, &dp->dim[i].siz,
                                &dp->dim[i].ne) != 3)
                        goto scanerr;
                dp->dim[i].siz -= dp->dim[i].org;
                asize *= dp->dim[i].ne;
        }
        if ((dp->arr = (DATATYPE *)malloc(asize*sizeof(DATATYPE))) == NULL)
                goto memerr;
        
        for (i = 0; i < asize; i++)
                if (fscanf(fp, DSCANF, &dp->arr[i]) != 1)
                        goto scanerr;
        
        fclose(fp);
        dp->next = dlist;
        return(dlist = dp);

memerr:
        error(SYSTEM, "out of memory in getdata");
scanerr:
        sprintf(errmsg, "%s in data file \"%s\"",
                        feof(fp) ? "unexpected EOF" : "bad format", dfname);
        error(USER, errmsg);
}


DATARRAY *
getpict(pname)                          /* get picture pname */
char  *pname;
{
        extern char  *libpath;
        char  *pfname;
        FILE  *fp;
        COLOR  *scanin;
        int  width, height;
        int  x, y;
        register int  i;
        register DATARRAY  *pp;
                                                /* look for array in list */
        for (pp = plist; pp != NULL; pp = pp->next)
                if (!strcmp(pname, pp->name))
                        return(pp);             /* found! */

        if ((pfname = getpath(pname, libpath, R_OK)) == NULL) {
                sprintf(errmsg, "cannot find picture file \"%s\"", pname);
                error(USER, errmsg);
        }
        if ((pp = (DATARRAY *)calloc(3, sizeof(DATARRAY))) == NULL)
                goto memerr;

        pp[0].name = 
        pp[1].name =
        pp[2].name = savestr(pname);

        if ((fp = fopen(pfname, "r")) == NULL) {
                sprintf(errmsg, "cannot open picture file \"%s\"", pfname);
                error(SYSTEM, errmsg);
        }
                                                /* get dimensions */
        getheader(fp, NULL);
        if (fscanf(fp, "-Y %d +X %d\n", &height, &width) != 2)
                goto readerr;
        for (i = 0; i < 3; i++) {
                pp[i].nd = 2;
                pp[i].dim[0].ne = width;
                pp[i].dim[1].ne = height;
                pp[i].dim[0].org =
                pp[i].dim[1].org = 0.0;
                if (width <= height) {
                        pp[i].dim[0].siz = 1.0;
                        pp[i].dim[1].siz = (double)height/width;
                } else {
                        pp[i].dim[0].siz = (double)width/height;
                        pp[i].dim[1].siz = 1.0;
                }
                pp[i].arr = (DATATYPE *)malloc(width*height*sizeof(DATATYPE));
                if (pp[i].arr == NULL)
                        goto memerr;
        }
                                                        /* load picture */
        if ((scanin = (COLOR *)malloc(width*sizeof(COLOR))) == NULL)
                goto memerr;
        for (y = height-1; y >= 0; y--) {
                if (freadscan(scanin, width, fp) < 0)
                        goto readerr;
                for (x = 0; x < width; x++)
                        for (i = 0; i < 3; i++)
                                pp[i].arr[x*height+y] = colval(scanin[x],i);
        }
        free((char *)scanin);
        fclose(fp);
        pp[0].next =
        pp[1].next =
        pp[2].next = plist;
        return(plist = pp);

memerr:
        error(SYSTEM, "out of memory in getpict");
readerr:
        sprintf(errmsg, "bad picture file \"%s\"", pfname);
        error(USER, errmsg);
}


freedata(dname)                 /* free memory associated with dname */
char  *dname;
{
        register DATARRAY  *dp, *dpl;

        for (dpl = NULL, dp = dlist; dp != NULL; dpl = dp, dp = dp->next)
                if (!strcmp(dname, dp->name)) {
                        if (dpl == NULL)
                                dlist = dp->next;
                        else
                                dpl->next = dp->next;
                        free((char *)dp->arr);
                        freestr(dp->name);
                        free((char *)dp);
                        return;
                }
}


freepict(pname)                 /* free memory associated with pname */
char  *pname;
{
        register DATARRAY  *pp, *ppl;

        for (ppl = NULL, pp = plist; pp != NULL; ppl = pp, pp = pp->next)
                if (!strcmp(pname, pp->name)) {
                        if (ppl == NULL)
                                plist = pp->next;
                        else
                                ppl->next = pp->next;
                        free((char *)pp[0].arr);
                        free((char *)pp[1].arr);
                        free((char *)pp[2].arr);
                        freestr(pp[0].name);
                        free((char *)pp);
                        return;
                }
}


double
datavalue(dp, pt)               /* interpolate data value at a point */
register DATARRAY  *dp;
double  *pt;
{
        DATARRAY  sd;
        int  asize;
        register int  i;
        double  x, y, y0, y1;

        sd.nd = dp->nd - 1;
        asize = 1;
        for (i = 0; i < sd.nd; i++) {
                sd.dim[i].org = dp->dim[i+1].org;
                sd.dim[i].siz = dp->dim[i+1].siz;
                asize *= sd.dim[i].ne = dp->dim[i+1].ne;
        }

        x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz;

        x *= dp->dim[0].ne - 1;

        i = x;
        if (i < 0)
                i = 0;
        else if (i > dp->dim[0].ne - 2)
                i = dp->dim[0].ne - 2;

        if (dp->nd == 1) {
                y0 = dp->arr[i];
                y1 = dp->arr[i+1];
        } else {
                sd.arr = &dp->arr[i*asize];
                y0 = datavalue(&sd, pt+1);
                sd.arr = &dp->arr[(i+1)*asize];
                y1 = datavalue(&sd, pt+1);
        }

        /*
         * Extrapolate as far as one division, then
         * taper off harmonically to zero.
         */
        if (x > i+2)
                y = (2*y1-y0)/(x-i-1);
        else if (x < i-1)
                y = (2*y0-y1)/(i-x);
        else
                y = y0*((i+1)-x) + y1*(x-i);

        return(y);
}
Revision:	1.2
Committed:	Thu Jul 27 22:25:10 1989 UTC (36 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+2 -2 lines
Log Message:	Changed getpath to check permissions
#	User	Rev	Content
1	greg	1.1	/* Copyright (c) 1986 Regents of the University of California */
2
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* data.c - routines dealing with interpolated data.
9			*
10			* 6/4/86
11			*/
12
13			#include "standard.h"
14
15			#include "color.h"
16
17			#include "data.h"
18
19
20			extern char libpath; / library search path */
21
22			static DATARRAY dlist = NULL; / data array list */
23
24			static DATARRAY plist = NULL; / picture list */
25
26
27			DATARRAY *
28			getdata(dname) /* get data array dname */
29			char *dname;
30			{
31			char *dfname;
32			FILE *fp;
33			int asize;
34			register int i;
35			register DATARRAY *dp;
36			/* look for array in list */
37			for (dp = dlist; dp != NULL; dp = dp->next)
38			if (!strcmp(dname, dp->name))
39			return(dp); /* found! */
40
41			/*
42			* If we haven't loaded the data already, we will look
43			* for it in the directorys specified by the library path.
44			*
45			* The file has the following format:
46			*
47			* #dimensions
48			* beg0 end0 n0
49			* beg1 end1 n1
50			* . . .
51			* data, later dimensions changing faster
52			* . . .
53			*
54			*/
55
56	greg	1.2	if ((dfname = getpath(dname, libpath, R_OK)) == NULL) {
57	greg	1.1	sprintf(errmsg, "cannot find data file \"%s\"", dname);
58			error(USER, errmsg);
59			}
60			if ((dp = (DATARRAY *)malloc(sizeof(DATARRAY))) == NULL)
61			goto memerr;
62
63			dp->name = savestr(dname);
64
65			if ((fp = fopen(dfname, "r")) == NULL) {
66			sprintf(errmsg, "cannot open data file \"%s\"", dfname);
67			error(SYSTEM, errmsg);
68			}
69			/* get dimensions */
70			if (fscanf(fp, "%d", &dp->nd) != 1)
71			goto scanerr;
72			if (dp->nd <= 0 \|\| dp->nd > MAXDIM) {
73			sprintf(errmsg, "bad number of dimensions for \"%s\"", dname);
74			error(USER, errmsg);
75			}
76			asize = 1;
77			for (i = 0; i < dp->nd; i++) {
78			if (fscanf(fp, "%lf %lf %d",
79			&dp->dim[i].org, &dp->dim[i].siz,
80			&dp->dim[i].ne) != 3)
81			goto scanerr;
82			dp->dim[i].siz -= dp->dim[i].org;
83			asize *= dp->dim[i].ne;
84			}
85			if ((dp->arr = (DATATYPE )malloc(asizesizeof(DATATYPE))) == NULL)
86			goto memerr;
87
88			for (i = 0; i < asize; i++)
89			if (fscanf(fp, DSCANF, &dp->arr[i]) != 1)
90			goto scanerr;
91
92			fclose(fp);
93			dp->next = dlist;
94			return(dlist = dp);
95
96			memerr:
97			error(SYSTEM, "out of memory in getdata");
98			scanerr:
99			sprintf(errmsg, "%s in data file \"%s\"",
100			feof(fp) ? "unexpected EOF" : "bad format", dfname);
101			error(USER, errmsg);
102			}
103
104
105			DATARRAY *
106			getpict(pname) /* get picture pname */
107			char *pname;
108			{
109			extern char *libpath;
110			char *pfname;
111			FILE *fp;
112			COLOR *scanin;
113			int width, height;
114			int x, y;
115			register int i;
116			register DATARRAY *pp;
117			/* look for array in list */
118			for (pp = plist; pp != NULL; pp = pp->next)
119			if (!strcmp(pname, pp->name))
120			return(pp); /* found! */
121
122	greg	1.2	if ((pfname = getpath(pname, libpath, R_OK)) == NULL) {
123	greg	1.1	sprintf(errmsg, "cannot find picture file \"%s\"", pname);
124			error(USER, errmsg);
125			}
126			if ((pp = (DATARRAY *)calloc(3, sizeof(DATARRAY))) == NULL)
127			goto memerr;
128
129			pp[0].name =
130			pp[1].name =
131			pp[2].name = savestr(pname);
132
133			if ((fp = fopen(pfname, "r")) == NULL) {
134			sprintf(errmsg, "cannot open picture file \"%s\"", pfname);
135			error(SYSTEM, errmsg);
136			}
137			/* get dimensions */
138			getheader(fp, NULL);
139			if (fscanf(fp, "-Y %d +X %d\n", &height, &width) != 2)
140			goto readerr;
141			for (i = 0; i < 3; i++) {
142			pp[i].nd = 2;
143			pp[i].dim[0].ne = width;
144			pp[i].dim[1].ne = height;
145			pp[i].dim[0].org =
146			pp[i].dim[1].org = 0.0;
147			if (width <= height) {
148			pp[i].dim[0].siz = 1.0;
149			pp[i].dim[1].siz = (double)height/width;
150			} else {
151			pp[i].dim[0].siz = (double)width/height;
152			pp[i].dim[1].siz = 1.0;
153			}
154			pp[i].arr = (DATATYPE )malloc(widthheight*sizeof(DATATYPE));
155			if (pp[i].arr == NULL)
156			goto memerr;
157			}
158			/* load picture */
159			if ((scanin = (COLOR )malloc(widthsizeof(COLOR))) == NULL)
160			goto memerr;
161			for (y = height-1; y >= 0; y--) {
162			if (freadscan(scanin, width, fp) < 0)
163			goto readerr;
164			for (x = 0; x < width; x++)
165			for (i = 0; i < 3; i++)
166			pp[i].arr[x*height+y] = colval(scanin[x],i);
167			}
168			free((char *)scanin);
169			fclose(fp);
170			pp[0].next =
171			pp[1].next =
172			pp[2].next = plist;
173			return(plist = pp);
174
175			memerr:
176			error(SYSTEM, "out of memory in getpict");
177			readerr:
178			sprintf(errmsg, "bad picture file \"%s\"", pfname);
179			error(USER, errmsg);
180			}
181
182
183			freedata(dname) /* free memory associated with dname */
184			char *dname;
185			{
186			register DATARRAY dp, dpl;
187
188			for (dpl = NULL, dp = dlist; dp != NULL; dpl = dp, dp = dp->next)
189			if (!strcmp(dname, dp->name)) {
190			if (dpl == NULL)
191			dlist = dp->next;
192			else
193			dpl->next = dp->next;
194			free((char *)dp->arr);
195			freestr(dp->name);
196			free((char *)dp);
197			return;
198			}
199			}
200
201
202			freepict(pname) /* free memory associated with pname */
203			char *pname;
204			{
205			register DATARRAY pp, ppl;
206
207			for (ppl = NULL, pp = plist; pp != NULL; ppl = pp, pp = pp->next)
208			if (!strcmp(pname, pp->name)) {
209			if (ppl == NULL)
210			plist = pp->next;
211			else
212			ppl->next = pp->next;
213			free((char *)pp[0].arr);
214			free((char *)pp[1].arr);
215			free((char *)pp[2].arr);
216			freestr(pp[0].name);
217			free((char *)pp);
218			return;
219			}
220			}
221
222
223			double
224			datavalue(dp, pt) /* interpolate data value at a point */
225			register DATARRAY *dp;
226			double *pt;
227			{
228			DATARRAY sd;
229			int asize;
230			register int i;
231			double x, y, y0, y1;
232
233			sd.nd = dp->nd - 1;
234			asize = 1;
235			for (i = 0; i < sd.nd; i++) {
236			sd.dim[i].org = dp->dim[i+1].org;
237			sd.dim[i].siz = dp->dim[i+1].siz;
238			asize *= sd.dim[i].ne = dp->dim[i+1].ne;
239			}
240
241			x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz;
242
243			x *= dp->dim[0].ne - 1;
244
245			i = x;
246			if (i < 0)
247			i = 0;
248			else if (i > dp->dim[0].ne - 2)
249			i = dp->dim[0].ne - 2;
250
251			if (dp->nd == 1) {
252			y0 = dp->arr[i];
253			y1 = dp->arr[i+1];
254			} else {
255			sd.arr = &dp->arr[i*asize];
256			y0 = datavalue(&sd, pt+1);
257			sd.arr = &dp->arr[(i+1)*asize];
258			y1 = datavalue(&sd, pt+1);
259			}
260
261			/*
262			* Extrapolate as far as one division, then
263			* taper off harmonically to zero.
264			*/
265			if (x > i+2)
266			y = (2*y1-y0)/(x-i-1);
267			else if (x < i-1)
268			y = (2*y0-y1)/(i-x);
269			else
270			y = y0((i+1)-x) + y1(x-i);
271
272			return(y);
273			}