1 |
greg |
1.8 |
/* Copyright (c) 1991 Regents of the University of California */ |
2 |
greg |
1.1 |
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3 |
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#ifndef lint |
4 |
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static char SCCSid[] = "$SunId$ LBL"; |
5 |
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#endif |
6 |
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7 |
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/* |
8 |
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* data.c - routines dealing with interpolated data. |
9 |
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* |
10 |
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* 6/4/86 |
11 |
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*/ |
12 |
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13 |
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#include "standard.h" |
14 |
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15 |
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#include "color.h" |
16 |
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17 |
greg |
1.11 |
#include "resolu.h" |
18 |
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19 |
greg |
1.1 |
#include "data.h" |
20 |
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21 |
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22 |
greg |
1.10 |
extern char *fgetword(); |
23 |
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extern double atof(); |
24 |
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25 |
greg |
1.1 |
extern char *libpath; /* library search path */ |
26 |
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27 |
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static DATARRAY *dlist = NULL; /* data array list */ |
28 |
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29 |
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static DATARRAY *plist = NULL; /* picture list */ |
30 |
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31 |
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32 |
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DATARRAY * |
33 |
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getdata(dname) /* get data array dname */ |
34 |
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char *dname; |
35 |
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{ |
36 |
greg |
1.10 |
char word[64]; |
37 |
greg |
1.1 |
char *dfname; |
38 |
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FILE *fp; |
39 |
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int asize; |
40 |
greg |
1.4 |
register int i, j; |
41 |
greg |
1.1 |
register DATARRAY *dp; |
42 |
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/* look for array in list */ |
43 |
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for (dp = dlist; dp != NULL; dp = dp->next) |
44 |
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if (!strcmp(dname, dp->name)) |
45 |
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return(dp); /* found! */ |
46 |
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47 |
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/* |
48 |
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* If we haven't loaded the data already, we will look |
49 |
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* for it in the directorys specified by the library path. |
50 |
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* |
51 |
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* The file has the following format: |
52 |
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* |
53 |
greg |
1.4 |
* N |
54 |
greg |
1.1 |
* beg0 end0 n0 |
55 |
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* beg1 end1 n1 |
56 |
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* . . . |
57 |
greg |
1.4 |
* begN endN nN |
58 |
greg |
1.1 |
* data, later dimensions changing faster |
59 |
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* . . . |
60 |
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* |
61 |
greg |
1.4 |
* For irregularly spaced points, the following can be |
62 |
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* substituted for begi endi ni: |
63 |
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* |
64 |
greg |
1.6 |
* 0 0 ni p0i p1i .. pni |
65 |
greg |
1.1 |
*/ |
66 |
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|
67 |
greg |
1.2 |
if ((dfname = getpath(dname, libpath, R_OK)) == NULL) { |
68 |
greg |
1.1 |
sprintf(errmsg, "cannot find data file \"%s\"", dname); |
69 |
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error(USER, errmsg); |
70 |
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} |
71 |
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if ((dp = (DATARRAY *)malloc(sizeof(DATARRAY))) == NULL) |
72 |
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goto memerr; |
73 |
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74 |
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dp->name = savestr(dname); |
75 |
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76 |
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if ((fp = fopen(dfname, "r")) == NULL) { |
77 |
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sprintf(errmsg, "cannot open data file \"%s\"", dfname); |
78 |
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error(SYSTEM, errmsg); |
79 |
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} |
80 |
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/* get dimensions */ |
81 |
greg |
1.10 |
if (fgetword(word, sizeof(word), fp) == NULL || !isint(word)) |
82 |
greg |
1.1 |
goto scanerr; |
83 |
greg |
1.10 |
dp->nd = atoi(word); |
84 |
greg |
1.9 |
if (dp->nd <= 0 || dp->nd > MAXDDIM) { |
85 |
greg |
1.1 |
sprintf(errmsg, "bad number of dimensions for \"%s\"", dname); |
86 |
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error(USER, errmsg); |
87 |
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} |
88 |
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asize = 1; |
89 |
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for (i = 0; i < dp->nd; i++) { |
90 |
greg |
1.10 |
if (fgetword(word, sizeof(word), fp) == NULL || !isflt(word)) |
91 |
greg |
1.6 |
goto scanerr; |
92 |
greg |
1.10 |
dp->dim[i].org = atof(word); |
93 |
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if (fgetword(word, sizeof(word), fp) == NULL || !isflt(word)) |
94 |
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goto scanerr; |
95 |
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dp->dim[i].siz = atof(word); |
96 |
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if (fgetword(word, sizeof(word), fp) == NULL || !isint(word)) |
97 |
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goto scanerr; |
98 |
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dp->dim[i].ne = atoi(word); |
99 |
greg |
1.6 |
if (dp->dim[i].ne < 2) |
100 |
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goto scanerr; |
101 |
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asize *= dp->dim[i].ne; |
102 |
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if ((dp->dim[i].siz -= dp->dim[i].org) == 0) { |
103 |
greg |
1.4 |
dp->dim[i].p = (double *)malloc(dp->dim[i].ne*sizeof(double)); |
104 |
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if (dp->dim[i].p == NULL) |
105 |
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goto memerr; |
106 |
greg |
1.10 |
for (j = 0; j < dp->dim[i].ne; j++) { |
107 |
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if (fgetword(word, sizeof(word), fp) == NULL || |
108 |
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!isflt(word)) |
109 |
greg |
1.4 |
goto scanerr; |
110 |
greg |
1.10 |
dp->dim[i].p[j] = atof(word); |
111 |
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} |
112 |
greg |
1.4 |
for (j = 1; j < dp->dim[i].ne-1; j++) |
113 |
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if ((dp->dim[i].p[j-1] < dp->dim[i].p[j]) != |
114 |
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(dp->dim[i].p[j] < dp->dim[i].p[j+1])) |
115 |
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goto scanerr; |
116 |
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dp->dim[i].org = dp->dim[i].p[0]; |
117 |
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dp->dim[i].siz = dp->dim[i].p[dp->dim[i].ne-1] |
118 |
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- dp->dim[i].p[0]; |
119 |
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} else |
120 |
greg |
1.6 |
dp->dim[i].p = NULL; |
121 |
greg |
1.1 |
} |
122 |
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if ((dp->arr = (DATATYPE *)malloc(asize*sizeof(DATATYPE))) == NULL) |
123 |
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goto memerr; |
124 |
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125 |
greg |
1.10 |
for (i = 0; i < asize; i++) { |
126 |
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if (fgetword(word, sizeof(word), fp) == NULL || !isflt(word)) |
127 |
greg |
1.1 |
goto scanerr; |
128 |
greg |
1.10 |
dp->arr[i] = atof(word); |
129 |
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} |
130 |
greg |
1.1 |
fclose(fp); |
131 |
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dp->next = dlist; |
132 |
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return(dlist = dp); |
133 |
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134 |
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memerr: |
135 |
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error(SYSTEM, "out of memory in getdata"); |
136 |
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scanerr: |
137 |
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sprintf(errmsg, "%s in data file \"%s\"", |
138 |
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feof(fp) ? "unexpected EOF" : "bad format", dfname); |
139 |
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error(USER, errmsg); |
140 |
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} |
141 |
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142 |
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143 |
greg |
1.5 |
static double inpaspect; /* aspect ratio of input picture */ |
144 |
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145 |
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static |
146 |
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headaspect(s) /* check string for aspect ratio */ |
147 |
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char *s; |
148 |
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{ |
149 |
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if (isaspect(s)) |
150 |
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inpaspect *= aspectval(s); |
151 |
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} |
152 |
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153 |
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154 |
greg |
1.1 |
DATARRAY * |
155 |
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getpict(pname) /* get picture pname */ |
156 |
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char *pname; |
157 |
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{ |
158 |
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extern char *libpath; |
159 |
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char *pfname; |
160 |
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FILE *fp; |
161 |
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COLOR *scanin; |
162 |
greg |
1.11 |
int sl, ns; |
163 |
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RESOLU inpres; |
164 |
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FLOAT loc[2]; |
165 |
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int y; |
166 |
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register int x, i; |
167 |
greg |
1.1 |
register DATARRAY *pp; |
168 |
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/* look for array in list */ |
169 |
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for (pp = plist; pp != NULL; pp = pp->next) |
170 |
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if (!strcmp(pname, pp->name)) |
171 |
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return(pp); /* found! */ |
172 |
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173 |
greg |
1.2 |
if ((pfname = getpath(pname, libpath, R_OK)) == NULL) { |
174 |
greg |
1.1 |
sprintf(errmsg, "cannot find picture file \"%s\"", pname); |
175 |
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error(USER, errmsg); |
176 |
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} |
177 |
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if ((pp = (DATARRAY *)calloc(3, sizeof(DATARRAY))) == NULL) |
178 |
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goto memerr; |
179 |
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180 |
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pp[0].name = |
181 |
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pp[1].name = |
182 |
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pp[2].name = savestr(pname); |
183 |
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184 |
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if ((fp = fopen(pfname, "r")) == NULL) { |
185 |
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sprintf(errmsg, "cannot open picture file \"%s\"", pfname); |
186 |
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error(SYSTEM, errmsg); |
187 |
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} |
188 |
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/* get dimensions */ |
189 |
greg |
1.5 |
inpaspect = 1.0; |
190 |
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getheader(fp, headaspect); |
191 |
greg |
1.11 |
if (!fgetsresolu(&inpres, fp)) |
192 |
greg |
1.1 |
goto readerr; |
193 |
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for (i = 0; i < 3; i++) { |
194 |
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pp[i].nd = 2; |
195 |
greg |
1.11 |
pp[i].dim[0].ne = inpres.yr; |
196 |
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pp[i].dim[1].ne = inpres.xr; |
197 |
greg |
1.1 |
pp[i].dim[0].org = |
198 |
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pp[i].dim[1].org = 0.0; |
199 |
greg |
1.11 |
if (inpres.xr <= inpres.yr*inpaspect) { |
200 |
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pp[i].dim[0].siz = inpaspect * |
201 |
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(double)inpres.yr/inpres.xr; |
202 |
greg |
1.7 |
pp[i].dim[1].siz = 1.0; |
203 |
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} else { |
204 |
greg |
1.1 |
pp[i].dim[0].siz = 1.0; |
205 |
greg |
1.11 |
pp[i].dim[1].siz = (double)inpres.xr/inpres.yr / |
206 |
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inpaspect; |
207 |
greg |
1.1 |
} |
208 |
greg |
1.7 |
pp[i].dim[0].p = pp[i].dim[1].p = NULL; |
209 |
greg |
1.11 |
pp[i].arr = (DATATYPE *) |
210 |
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malloc(inpres.xr*inpres.yr*sizeof(DATATYPE)); |
211 |
greg |
1.1 |
if (pp[i].arr == NULL) |
212 |
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goto memerr; |
213 |
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} |
214 |
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/* load picture */ |
215 |
greg |
1.11 |
sl = scanlen(&inpres); |
216 |
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ns = numscans(&inpres); |
217 |
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if ((scanin = (COLOR *)malloc(sl*sizeof(COLOR))) == NULL) |
218 |
greg |
1.1 |
goto memerr; |
219 |
greg |
1.11 |
for (y = 0; y < ns; y++) { |
220 |
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if (freadscan(scanin, sl, fp) < 0) |
221 |
greg |
1.1 |
goto readerr; |
222 |
greg |
1.11 |
for (x = 0; x < sl; x++) { |
223 |
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pix2loc(loc, &inpres, x, y); |
224 |
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i = (int)(loc[1]*inpres.yr)*inpres.xr + |
225 |
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(int)(loc[0]*inpres.xr); |
226 |
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pp[0].arr[i] = colval(scanin[x],RED); |
227 |
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pp[1].arr[i] = colval(scanin[x],GRN); |
228 |
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pp[2].arr[i] = colval(scanin[x],BLU); |
229 |
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} |
230 |
greg |
1.1 |
} |
231 |
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free((char *)scanin); |
232 |
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fclose(fp); |
233 |
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pp[0].next = |
234 |
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pp[1].next = |
235 |
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pp[2].next = plist; |
236 |
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return(plist = pp); |
237 |
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238 |
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memerr: |
239 |
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error(SYSTEM, "out of memory in getpict"); |
240 |
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readerr: |
241 |
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sprintf(errmsg, "bad picture file \"%s\"", pfname); |
242 |
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error(USER, errmsg); |
243 |
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} |
244 |
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245 |
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246 |
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freedata(dname) /* free memory associated with dname */ |
247 |
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char *dname; |
248 |
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{ |
249 |
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register DATARRAY *dp, *dpl; |
250 |
greg |
1.4 |
register int i; |
251 |
greg |
1.1 |
|
252 |
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for (dpl = NULL, dp = dlist; dp != NULL; dpl = dp, dp = dp->next) |
253 |
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if (!strcmp(dname, dp->name)) { |
254 |
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if (dpl == NULL) |
255 |
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dlist = dp->next; |
256 |
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else |
257 |
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dpl->next = dp->next; |
258 |
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free((char *)dp->arr); |
259 |
greg |
1.4 |
for (i = 0; i < dp->nd; i++) |
260 |
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if (dp->dim[i].p != NULL) |
261 |
|
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free((char *)dp->dim[i].p); |
262 |
greg |
1.1 |
freestr(dp->name); |
263 |
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free((char *)dp); |
264 |
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return; |
265 |
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} |
266 |
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} |
267 |
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268 |
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269 |
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freepict(pname) /* free memory associated with pname */ |
270 |
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char *pname; |
271 |
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{ |
272 |
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register DATARRAY *pp, *ppl; |
273 |
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274 |
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for (ppl = NULL, pp = plist; pp != NULL; ppl = pp, pp = pp->next) |
275 |
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if (!strcmp(pname, pp->name)) { |
276 |
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if (ppl == NULL) |
277 |
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plist = pp->next; |
278 |
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else |
279 |
|
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ppl->next = pp->next; |
280 |
|
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free((char *)pp[0].arr); |
281 |
|
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free((char *)pp[1].arr); |
282 |
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free((char *)pp[2].arr); |
283 |
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freestr(pp[0].name); |
284 |
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free((char *)pp); |
285 |
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return; |
286 |
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} |
287 |
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} |
288 |
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289 |
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290 |
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double |
291 |
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datavalue(dp, pt) /* interpolate data value at a point */ |
292 |
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register DATARRAY *dp; |
293 |
|
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double *pt; |
294 |
|
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{ |
295 |
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DATARRAY sd; |
296 |
|
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int asize; |
297 |
greg |
1.6 |
int lower, upper; |
298 |
greg |
1.1 |
register int i; |
299 |
|
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double x, y, y0, y1; |
300 |
greg |
1.4 |
/* set up dimensions for recursion */ |
301 |
greg |
1.1 |
sd.nd = dp->nd - 1; |
302 |
|
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asize = 1; |
303 |
|
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for (i = 0; i < sd.nd; i++) { |
304 |
|
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sd.dim[i].org = dp->dim[i+1].org; |
305 |
|
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sd.dim[i].siz = dp->dim[i+1].siz; |
306 |
greg |
1.4 |
sd.dim[i].p = dp->dim[i+1].p; |
307 |
greg |
1.1 |
asize *= sd.dim[i].ne = dp->dim[i+1].ne; |
308 |
|
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} |
309 |
greg |
1.4 |
/* get independent variable */ |
310 |
|
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if (dp->dim[0].p == NULL) { /* evenly spaced points */ |
311 |
|
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x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz; |
312 |
|
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x = x * (dp->dim[0].ne - 1); |
313 |
|
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i = x; |
314 |
|
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if (i < 0) |
315 |
|
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i = 0; |
316 |
|
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else if (i > dp->dim[0].ne - 2) |
317 |
|
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i = dp->dim[0].ne - 2; |
318 |
|
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} else { /* unevenly spaced points */ |
319 |
greg |
1.6 |
if (dp->dim[0].siz > 0.0) { |
320 |
|
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lower = 0; |
321 |
|
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upper = dp->dim[0].ne; |
322 |
|
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} else { |
323 |
|
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lower = dp->dim[0].ne; |
324 |
|
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upper = 0; |
325 |
|
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} |
326 |
|
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do { |
327 |
|
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i = (lower + upper) >> 1; |
328 |
|
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if (pt[0] >= dp->dim[0].p[i]) |
329 |
|
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lower = i; |
330 |
greg |
1.8 |
else |
331 |
greg |
1.6 |
upper = i; |
332 |
|
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} while (i != (lower + upper) >> 1); |
333 |
greg |
1.8 |
if (i > dp->dim[0].ne - 2) |
334 |
greg |
1.4 |
i = dp->dim[0].ne - 2; |
335 |
|
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x = i + (pt[0] - dp->dim[0].p[i]) / |
336 |
|
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(dp->dim[0].p[i+1] - dp->dim[0].p[i]); |
337 |
|
|
} |
338 |
|
|
/* get dependent variable */ |
339 |
greg |
1.1 |
if (dp->nd == 1) { |
340 |
|
|
y0 = dp->arr[i]; |
341 |
|
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y1 = dp->arr[i+1]; |
342 |
|
|
} else { |
343 |
|
|
sd.arr = &dp->arr[i*asize]; |
344 |
|
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y0 = datavalue(&sd, pt+1); |
345 |
|
|
sd.arr = &dp->arr[(i+1)*asize]; |
346 |
|
|
y1 = datavalue(&sd, pt+1); |
347 |
|
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} |
348 |
|
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/* |
349 |
|
|
* Extrapolate as far as one division, then |
350 |
|
|
* taper off harmonically to zero. |
351 |
|
|
*/ |
352 |
|
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if (x > i+2) |
353 |
|
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y = (2*y1-y0)/(x-i-1); |
354 |
|
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else if (x < i-1) |
355 |
|
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y = (2*y0-y1)/(i-x); |
356 |
|
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else |
357 |
|
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y = y0*((i+1)-x) + y1*(x-i); |
358 |
|
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|
359 |
|
|
return(y); |
360 |
|
|
} |