1 |
– |
/* Copyright (c) 1986 Regents of the University of California */ |
2 |
– |
|
1 |
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#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
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#endif |
6 |
– |
|
4 |
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/* |
5 |
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* data.c - routines dealing with interpolated data. |
9 |
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* |
10 |
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* 6/4/86 |
6 |
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*/ |
7 |
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|
8 |
< |
#include "standard.h" |
8 |
> |
#include "copyright.h" |
9 |
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|
10 |
< |
#include "color.h" |
10 |
> |
#include <time.h> |
11 |
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|
12 |
+ |
#include "platform.h" |
13 |
+ |
#include "paths.h" |
14 |
+ |
#include "standard.h" |
15 |
+ |
#include "color.h" |
16 |
+ |
#include "resolu.h" |
17 |
+ |
#include "view.h" |
18 |
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#include "data.h" |
19 |
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|
20 |
+ |
/* picture memory usage before warning */ |
21 |
+ |
#ifndef PSIZWARN |
22 |
+ |
#ifdef SMLMEM |
23 |
+ |
#define PSIZWARN 1500000 |
24 |
+ |
#else |
25 |
+ |
#define PSIZWARN 5000000 |
26 |
+ |
#endif |
27 |
+ |
#endif |
28 |
|
|
29 |
< |
extern char *libpath; /* library search path */ |
29 |
> |
#ifndef TABSIZ |
30 |
> |
#define TABSIZ 97 /* table size (prime) */ |
31 |
> |
#endif |
32 |
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|
33 |
< |
static DATARRAY *dlist = NULL; /* data array list */ |
33 |
> |
#define hash(s) (shash(s)%TABSIZ) |
34 |
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|
24 |
– |
static DATARRAY *plist = NULL; /* picture list */ |
35 |
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|
36 |
+ |
static DATARRAY *dtab[TABSIZ]; /* data array list */ |
37 |
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|
38 |
< |
DATARRAY * |
39 |
< |
getdata(dname) /* get data array dname */ |
40 |
< |
char *dname; |
38 |
> |
static gethfunc headaspect; |
39 |
> |
|
40 |
> |
|
41 |
> |
extern DATARRAY * |
42 |
> |
getdata( /* get data array dname */ |
43 |
> |
char *dname |
44 |
> |
) |
45 |
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{ |
46 |
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char *dfname; |
47 |
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FILE *fp; |
49 |
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register int i, j; |
50 |
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register DATARRAY *dp; |
51 |
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/* look for array in list */ |
52 |
< |
for (dp = dlist; dp != NULL; dp = dp->next) |
52 |
> |
for (dp = dtab[hash(dname)]; dp != NULL; dp = dp->next) |
53 |
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if (!strcmp(dname, dp->name)) |
54 |
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return(dp); /* found! */ |
40 |
– |
|
55 |
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/* |
56 |
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* If we haven't loaded the data already, we will look |
57 |
< |
* for it in the directorys specified by the library path. |
57 |
> |
* for it in the directories specified by the library path. |
58 |
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* |
59 |
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* The file has the following format: |
60 |
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* |
72 |
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* 0 0 ni p0i p1i .. pni |
73 |
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*/ |
74 |
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|
75 |
< |
if ((dfname = getpath(dname, libpath, R_OK)) == NULL) { |
75 |
> |
if ((dfname = getpath(dname, getrlibpath(), R_OK)) == NULL) { |
76 |
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sprintf(errmsg, "cannot find data file \"%s\"", dname); |
77 |
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error(USER, errmsg); |
78 |
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} |
65 |
– |
if ((dp = (DATARRAY *)malloc(sizeof(DATARRAY))) == NULL) |
66 |
– |
goto memerr; |
67 |
– |
|
68 |
– |
dp->name = savestr(dname); |
69 |
– |
|
79 |
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if ((fp = fopen(dfname, "r")) == NULL) { |
80 |
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sprintf(errmsg, "cannot open data file \"%s\"", dfname); |
81 |
|
error(SYSTEM, errmsg); |
82 |
|
} |
83 |
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/* get dimensions */ |
84 |
< |
if (fscanf(fp, "%d", &dp->nd) != 1) |
84 |
> |
if (fgetval(fp, 'i', (char *)&asize) <= 0) |
85 |
|
goto scanerr; |
86 |
< |
if (dp->nd <= 0 || dp->nd > MAXDIM) { |
86 |
> |
if ((asize <= 0) | (asize > MAXDDIM)) { |
87 |
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sprintf(errmsg, "bad number of dimensions for \"%s\"", dname); |
88 |
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error(USER, errmsg); |
89 |
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} |
90 |
+ |
if ((dp = (DATARRAY *)malloc(sizeof(DATARRAY))) == NULL) |
91 |
+ |
goto memerr; |
92 |
+ |
dp->name = savestr(dname); |
93 |
+ |
dp->type = DATATY; |
94 |
+ |
dp->nd = asize; |
95 |
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asize = 1; |
96 |
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for (i = 0; i < dp->nd; i++) { |
97 |
< |
if (fscanf(fp, "%lf %lf %d", |
84 |
< |
&dp->dim[i].org, &dp->dim[i].siz, |
85 |
< |
&dp->dim[i].ne) != 3) |
97 |
> |
if (fgetval(fp, DATATY, (char *)&dp->dim[i].org) <= 0) |
98 |
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goto scanerr; |
99 |
+ |
if (fgetval(fp, DATATY, (char *)&dp->dim[i].siz) <= 0) |
100 |
+ |
goto scanerr; |
101 |
+ |
if (fgetval(fp, 'i', (char *)&dp->dim[i].ne) <= 0) |
102 |
+ |
goto scanerr; |
103 |
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if (dp->dim[i].ne < 2) |
104 |
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goto scanerr; |
105 |
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asize *= dp->dim[i].ne; |
106 |
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if ((dp->dim[i].siz -= dp->dim[i].org) == 0) { |
107 |
< |
dp->dim[i].p = (double *)malloc(dp->dim[i].ne*sizeof(double)); |
107 |
> |
dp->dim[i].p = (DATATYPE *) |
108 |
> |
malloc(dp->dim[i].ne*sizeof(DATATYPE)); |
109 |
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if (dp->dim[i].p == NULL) |
110 |
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goto memerr; |
111 |
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for (j = 0; j < dp->dim[i].ne; j++) |
112 |
< |
if (fscanf(fp, "%lf", &dp->dim[i].p[j]) != 1) |
112 |
> |
if (fgetval(fp, DATATY, |
113 |
> |
(char *)&dp->dim[i].p[j]) <= 0) |
114 |
|
goto scanerr; |
115 |
|
for (j = 1; j < dp->dim[i].ne-1; j++) |
116 |
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if ((dp->dim[i].p[j-1] < dp->dim[i].p[j]) != |
122 |
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} else |
123 |
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dp->dim[i].p = NULL; |
124 |
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} |
125 |
< |
if ((dp->arr = (DATATYPE *)malloc(asize*sizeof(DATATYPE))) == NULL) |
125 |
> |
if ((dp->arr.d = (DATATYPE *)malloc(asize*sizeof(DATATYPE))) == NULL) |
126 |
|
goto memerr; |
127 |
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|
128 |
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for (i = 0; i < asize; i++) |
129 |
< |
if (fscanf(fp, DSCANF, &dp->arr[i]) != 1) |
129 |
> |
if (fgetval(fp, DATATY, (char *)&dp->arr.d[i]) <= 0) |
130 |
|
goto scanerr; |
113 |
– |
|
131 |
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fclose(fp); |
132 |
< |
dp->next = dlist; |
133 |
< |
return(dlist = dp); |
132 |
> |
i = hash(dname); |
133 |
> |
dp->next = dtab[i]; |
134 |
> |
return(dtab[i] = dp); |
135 |
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|
136 |
|
memerr: |
137 |
|
error(SYSTEM, "out of memory in getdata"); |
139 |
|
sprintf(errmsg, "%s in data file \"%s\"", |
140 |
|
feof(fp) ? "unexpected EOF" : "bad format", dfname); |
141 |
|
error(USER, errmsg); |
142 |
+ |
return NULL; /* pro forma return */ |
143 |
|
} |
144 |
|
|
145 |
|
|
146 |
< |
static double inpaspect; /* aspect ratio of input picture */ |
147 |
< |
|
148 |
< |
static |
149 |
< |
headaspect(s) /* check string for aspect ratio */ |
150 |
< |
char *s; |
146 |
> |
static int |
147 |
> |
headaspect( /* check string for aspect ratio */ |
148 |
> |
char *s, |
149 |
> |
void *iap |
150 |
> |
) |
151 |
|
{ |
152 |
+ |
char fmt[32]; |
153 |
+ |
|
154 |
|
if (isaspect(s)) |
155 |
< |
inpaspect *= aspectval(s); |
155 |
> |
*(double*)iap *= aspectval(s); |
156 |
> |
else if (formatval(fmt, s) && !globmatch(PICFMT, fmt)) |
157 |
> |
*(double*)iap = 0.0; |
158 |
> |
return(0); |
159 |
|
} |
160 |
|
|
161 |
|
|
162 |
< |
DATARRAY * |
163 |
< |
getpict(pname) /* get picture pname */ |
164 |
< |
char *pname; |
162 |
> |
extern DATARRAY * |
163 |
> |
getpict( /* get picture pname */ |
164 |
> |
char *pname |
165 |
> |
) |
166 |
|
{ |
167 |
< |
extern char *libpath; |
167 |
> |
double inpaspect; |
168 |
|
char *pfname; |
169 |
|
FILE *fp; |
170 |
< |
COLOR *scanin; |
171 |
< |
int width, height; |
172 |
< |
int x, y; |
173 |
< |
register int i; |
170 |
> |
COLR *scanin; |
171 |
> |
int sl, ns; |
172 |
> |
RESOLU inpres; |
173 |
> |
RREAL loc[2]; |
174 |
> |
int y; |
175 |
> |
register int x, i; |
176 |
|
register DATARRAY *pp; |
177 |
|
/* look for array in list */ |
178 |
< |
for (pp = plist; pp != NULL; pp = pp->next) |
178 |
> |
for (pp = dtab[hash(pname)]; pp != NULL; pp = pp->next) |
179 |
|
if (!strcmp(pname, pp->name)) |
180 |
|
return(pp); /* found! */ |
181 |
|
|
182 |
< |
if ((pfname = getpath(pname, libpath, R_OK)) == NULL) { |
182 |
> |
if ((pfname = getpath(pname, getrlibpath(), R_OK)) == NULL) { |
183 |
|
sprintf(errmsg, "cannot find picture file \"%s\"", pname); |
184 |
|
error(USER, errmsg); |
185 |
|
} |
186 |
< |
if ((pp = (DATARRAY *)calloc(3, sizeof(DATARRAY))) == NULL) |
186 |
> |
if ((pp = (DATARRAY *)malloc(3*sizeof(DATARRAY))) == NULL) |
187 |
|
goto memerr; |
188 |
|
|
189 |
< |
pp[0].name = |
163 |
< |
pp[1].name = |
164 |
< |
pp[2].name = savestr(pname); |
189 |
> |
pp[0].name = savestr(pname); |
190 |
|
|
191 |
|
if ((fp = fopen(pfname, "r")) == NULL) { |
192 |
|
sprintf(errmsg, "cannot open picture file \"%s\"", pfname); |
193 |
|
error(SYSTEM, errmsg); |
194 |
|
} |
195 |
+ |
SET_FILE_BINARY(fp); |
196 |
|
/* get dimensions */ |
197 |
|
inpaspect = 1.0; |
198 |
< |
getheader(fp, headaspect); |
199 |
< |
if (fgetresolu(&width, &height, fp) != (YMAJOR|YDECR)) |
198 |
> |
getheader(fp, headaspect, &inpaspect); |
199 |
> |
if (inpaspect <= FTINY || !fgetsresolu(&inpres, fp)) |
200 |
|
goto readerr; |
201 |
< |
for (i = 0; i < 3; i++) { |
202 |
< |
pp[i].nd = 2; |
203 |
< |
pp[i].dim[0].ne = height; |
204 |
< |
pp[i].dim[1].ne = width; |
205 |
< |
pp[i].dim[0].org = |
206 |
< |
pp[i].dim[1].org = 0.0; |
207 |
< |
if (width <= height*inpaspect) { |
208 |
< |
pp[i].dim[0].siz = inpaspect*(double)height/width; |
209 |
< |
pp[i].dim[1].siz = 1.0; |
210 |
< |
} else { |
211 |
< |
pp[i].dim[0].siz = 1.0; |
212 |
< |
pp[i].dim[1].siz = (double)width/height/inpaspect; |
213 |
< |
} |
188 |
< |
pp[i].dim[0].p = pp[i].dim[1].p = NULL; |
189 |
< |
pp[i].arr = (DATATYPE *)malloc(width*height*sizeof(DATATYPE)); |
190 |
< |
if (pp[i].arr == NULL) |
191 |
< |
goto memerr; |
201 |
> |
pp[0].nd = 2; |
202 |
> |
pp[0].dim[0].ne = inpres.yr; |
203 |
> |
pp[0].dim[1].ne = inpres.xr; |
204 |
> |
pp[0].dim[0].org = |
205 |
> |
pp[0].dim[1].org = 0.0; |
206 |
> |
if (inpres.xr <= inpres.yr*inpaspect) { |
207 |
> |
pp[0].dim[0].siz = inpaspect * |
208 |
> |
(double)inpres.yr/inpres.xr; |
209 |
> |
pp[0].dim[1].siz = 1.0; |
210 |
> |
} else { |
211 |
> |
pp[0].dim[0].siz = 1.0; |
212 |
> |
pp[0].dim[1].siz = (double)inpres.xr/inpres.yr / |
213 |
> |
inpaspect; |
214 |
|
} |
215 |
+ |
pp[0].dim[0].p = pp[0].dim[1].p = NULL; |
216 |
+ |
sl = scanlen(&inpres); /* allocate array */ |
217 |
+ |
ns = numscans(&inpres); |
218 |
+ |
i = ns*sl*sizeof(COLR); |
219 |
+ |
#if PSIZWARN |
220 |
+ |
if (i > PSIZWARN) { /* memory warning */ |
221 |
+ |
sprintf(errmsg, "picture file \"%s\" using %d bytes of memory", |
222 |
+ |
pname, i); |
223 |
+ |
error(WARNING, errmsg); |
224 |
+ |
} |
225 |
+ |
#endif |
226 |
+ |
if ((pp[0].arr.c = (COLR *)malloc(i)) == NULL) |
227 |
+ |
goto memerr; |
228 |
|
/* load picture */ |
229 |
< |
if ((scanin = (COLOR *)malloc(width*sizeof(COLOR))) == NULL) |
229 |
> |
if ((scanin = (COLR *)malloc(sl*sizeof(COLR))) == NULL) |
230 |
|
goto memerr; |
231 |
< |
for (y = height-1; y >= 0; y--) { |
232 |
< |
if (freadscan(scanin, width, fp) < 0) |
231 |
> |
for (y = 0; y < ns; y++) { |
232 |
> |
if (freadcolrs(scanin, sl, fp) < 0) |
233 |
|
goto readerr; |
234 |
< |
for (x = 0; x < width; x++) |
235 |
< |
for (i = 0; i < 3; i++) |
236 |
< |
pp[i].arr[y*width+x] = colval(scanin[x],i); |
234 |
> |
for (x = 0; x < sl; x++) { |
235 |
> |
pix2loc(loc, &inpres, x, y); |
236 |
> |
i = (int)(loc[1]*inpres.yr)*inpres.xr + |
237 |
> |
(int)(loc[0]*inpres.xr); |
238 |
> |
copycolr(pp[0].arr.c[i], scanin[x]); |
239 |
> |
} |
240 |
|
} |
241 |
< |
free((char *)scanin); |
241 |
> |
free((void *)scanin); |
242 |
|
fclose(fp); |
243 |
< |
pp[0].next = |
244 |
< |
pp[1].next = |
245 |
< |
pp[2].next = plist; |
246 |
< |
return(plist = pp); |
243 |
> |
i = hash(pname); |
244 |
> |
pp[0].next = dtab[i]; /* link into picture list */ |
245 |
> |
pp[1] = pp[0]; |
246 |
> |
pp[2] = pp[0]; |
247 |
> |
pp[0].type = RED; /* differentiate RGB records */ |
248 |
> |
pp[1].type = GRN; |
249 |
> |
pp[2].type = BLU; |
250 |
> |
return(dtab[i] = pp); |
251 |
|
|
252 |
|
memerr: |
253 |
|
error(SYSTEM, "out of memory in getpict"); |
254 |
|
readerr: |
255 |
|
sprintf(errmsg, "bad picture file \"%s\"", pfname); |
256 |
|
error(USER, errmsg); |
257 |
+ |
return NULL; /* pro forma return */ |
258 |
|
} |
259 |
|
|
260 |
|
|
261 |
< |
freedata(dname) /* free memory associated with dname */ |
262 |
< |
char *dname; |
261 |
> |
extern void |
262 |
> |
freedata( /* release data array reference */ |
263 |
> |
DATARRAY *dta |
264 |
> |
) |
265 |
|
{ |
266 |
< |
register DATARRAY *dp, *dpl; |
266 |
> |
DATARRAY head; |
267 |
> |
int hval, nents; |
268 |
> |
register DATARRAY *dpl, *dp; |
269 |
|
register int i; |
270 |
|
|
271 |
< |
for (dpl = NULL, dp = dlist; dp != NULL; dpl = dp, dp = dp->next) |
272 |
< |
if (!strcmp(dname, dp->name)) { |
273 |
< |
if (dpl == NULL) |
274 |
< |
dlist = dp->next; |
275 |
< |
else |
271 |
> |
if (dta == NULL) { /* free all if NULL */ |
272 |
> |
hval = 0; nents = TABSIZ; |
273 |
> |
} else { |
274 |
> |
hval = hash(dta->name); nents = 1; |
275 |
> |
} |
276 |
> |
while (nents--) { |
277 |
> |
head.next = dtab[hval]; |
278 |
> |
dpl = &head; |
279 |
> |
while ((dp = dpl->next) != NULL) |
280 |
> |
if ((dta == NULL) | (dta == dp)) { |
281 |
|
dpl->next = dp->next; |
282 |
< |
free((char *)dp->arr); |
283 |
< |
for (i = 0; i < dp->nd; i++) |
284 |
< |
if (dp->dim[i].p != NULL) |
285 |
< |
free((char *)dp->dim[i].p); |
286 |
< |
freestr(dp->name); |
287 |
< |
free((char *)dp); |
288 |
< |
return; |
289 |
< |
} |
282 |
> |
if (dp->type == DATATY) |
283 |
> |
free((void *)dp->arr.d); |
284 |
> |
else |
285 |
> |
free((void *)dp->arr.c); |
286 |
> |
for (i = 0; i < dp->nd; i++) |
287 |
> |
if (dp->dim[i].p != NULL) |
288 |
> |
free((void *)dp->dim[i].p); |
289 |
> |
freestr(dp->name); |
290 |
> |
free((void *)dp); |
291 |
> |
} else |
292 |
> |
dpl = dp; |
293 |
> |
dtab[hval++] = head.next; |
294 |
> |
} |
295 |
|
} |
296 |
|
|
297 |
|
|
298 |
< |
freepict(pname) /* free memory associated with pname */ |
299 |
< |
char *pname; |
298 |
> |
extern double |
299 |
> |
datavalue( /* interpolate data value at a point */ |
300 |
> |
register DATARRAY *dp, |
301 |
> |
double *pt |
302 |
> |
) |
303 |
|
{ |
244 |
– |
register DATARRAY *pp, *ppl; |
245 |
– |
|
246 |
– |
for (ppl = NULL, pp = plist; pp != NULL; ppl = pp, pp = pp->next) |
247 |
– |
if (!strcmp(pname, pp->name)) { |
248 |
– |
if (ppl == NULL) |
249 |
– |
plist = pp->next; |
250 |
– |
else |
251 |
– |
ppl->next = pp->next; |
252 |
– |
free((char *)pp[0].arr); |
253 |
– |
free((char *)pp[1].arr); |
254 |
– |
free((char *)pp[2].arr); |
255 |
– |
freestr(pp[0].name); |
256 |
– |
free((char *)pp); |
257 |
– |
return; |
258 |
– |
} |
259 |
– |
} |
260 |
– |
|
261 |
– |
|
262 |
– |
double |
263 |
– |
datavalue(dp, pt) /* interpolate data value at a point */ |
264 |
– |
register DATARRAY *dp; |
265 |
– |
double *pt; |
266 |
– |
{ |
304 |
|
DATARRAY sd; |
305 |
|
int asize; |
306 |
|
int lower, upper; |
307 |
|
register int i; |
308 |
< |
double x, y, y0, y1; |
308 |
> |
double x, y0, y1; |
309 |
|
/* set up dimensions for recursion */ |
310 |
< |
sd.nd = dp->nd - 1; |
311 |
< |
asize = 1; |
312 |
< |
for (i = 0; i < sd.nd; i++) { |
313 |
< |
sd.dim[i].org = dp->dim[i+1].org; |
314 |
< |
sd.dim[i].siz = dp->dim[i+1].siz; |
315 |
< |
sd.dim[i].p = dp->dim[i+1].p; |
316 |
< |
asize *= sd.dim[i].ne = dp->dim[i+1].ne; |
310 |
> |
if (dp->nd > 1) { |
311 |
> |
sd.name = dp->name; |
312 |
> |
sd.type = dp->type; |
313 |
> |
sd.nd = dp->nd - 1; |
314 |
> |
asize = 1; |
315 |
> |
for (i = 0; i < sd.nd; i++) { |
316 |
> |
sd.dim[i].org = dp->dim[i+1].org; |
317 |
> |
sd.dim[i].siz = dp->dim[i+1].siz; |
318 |
> |
sd.dim[i].p = dp->dim[i+1].p; |
319 |
> |
asize *= sd.dim[i].ne = dp->dim[i+1].ne; |
320 |
> |
} |
321 |
|
} |
322 |
|
/* get independent variable */ |
323 |
|
if (dp->dim[0].p == NULL) { /* evenly spaced points */ |
324 |
|
x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz; |
325 |
< |
x = x * (dp->dim[0].ne - 1); |
325 |
> |
x *= (double)(dp->dim[0].ne - 1); |
326 |
|
i = x; |
327 |
|
if (i < 0) |
328 |
|
i = 0; |
340 |
|
i = (lower + upper) >> 1; |
341 |
|
if (pt[0] >= dp->dim[0].p[i]) |
342 |
|
lower = i; |
343 |
< |
else if (pt[0] < dp->dim[0].p[i]) |
343 |
> |
else |
344 |
|
upper = i; |
345 |
|
} while (i != (lower + upper) >> 1); |
346 |
< |
if (i < 0) |
306 |
< |
i = 0; |
307 |
< |
else if (i > dp->dim[0].ne - 2) |
346 |
> |
if (i > dp->dim[0].ne - 2) |
347 |
|
i = dp->dim[0].ne - 2; |
348 |
|
x = i + (pt[0] - dp->dim[0].p[i]) / |
349 |
|
(dp->dim[0].p[i+1] - dp->dim[0].p[i]); |
350 |
|
} |
351 |
|
/* get dependent variable */ |
352 |
< |
if (dp->nd == 1) { |
353 |
< |
y0 = dp->arr[i]; |
354 |
< |
y1 = dp->arr[i+1]; |
352 |
> |
if (dp->nd > 1) { |
353 |
> |
if (dp->type == DATATY) { |
354 |
> |
sd.arr.d = dp->arr.d + i*asize; |
355 |
> |
y0 = datavalue(&sd, pt+1); |
356 |
> |
sd.arr.d = dp->arr.d + (i+1)*asize; |
357 |
> |
y1 = datavalue(&sd, pt+1); |
358 |
> |
} else { |
359 |
> |
sd.arr.c = dp->arr.c + i*asize; |
360 |
> |
y0 = datavalue(&sd, pt+1); |
361 |
> |
sd.arr.c = dp->arr.c + (i+1)*asize; |
362 |
> |
y1 = datavalue(&sd, pt+1); |
363 |
> |
} |
364 |
|
} else { |
365 |
< |
sd.arr = &dp->arr[i*asize]; |
366 |
< |
y0 = datavalue(&sd, pt+1); |
367 |
< |
sd.arr = &dp->arr[(i+1)*asize]; |
368 |
< |
y1 = datavalue(&sd, pt+1); |
365 |
> |
if (dp->type == DATATY) { |
366 |
> |
y0 = dp->arr.d[i]; |
367 |
> |
y1 = dp->arr.d[i+1]; |
368 |
> |
} else { |
369 |
> |
y0 = colrval(dp->arr.c[i],dp->type); |
370 |
> |
y1 = colrval(dp->arr.c[i+1],dp->type); |
371 |
> |
} |
372 |
|
} |
373 |
|
/* |
374 |
|
* Extrapolate as far as one division, then |
375 |
|
* taper off harmonically to zero. |
376 |
|
*/ |
377 |
|
if (x > i+2) |
378 |
< |
y = (2*y1-y0)/(x-i-1); |
328 |
< |
else if (x < i-1) |
329 |
< |
y = (2*y0-y1)/(i-x); |
330 |
< |
else |
331 |
< |
y = y0*((i+1)-x) + y1*(x-i); |
378 |
> |
return( (2*y1-y0)/(x-(i-1)) ); |
379 |
|
|
380 |
< |
return(y); |
380 |
> |
if (x < i-1) |
381 |
> |
return( (2*y0-y1)/(i-x) ); |
382 |
> |
|
383 |
> |
return( y0*((i+1)-x) + y1*(x-i) ); |
384 |
|
} |