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"; |
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#endif |
6 |
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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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15 |
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#include "color.h" |
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17 |
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#include "data.h" |
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20 |
greg |
1.10 |
extern char *fgetword(); |
21 |
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extern double atof(); |
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23 |
greg |
1.1 |
extern char *libpath; /* library search path */ |
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static DATARRAY *dlist = NULL; /* data array list */ |
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27 |
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static DATARRAY *plist = NULL; /* picture list */ |
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30 |
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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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{ |
34 |
greg |
1.10 |
char word[64]; |
35 |
greg |
1.1 |
char *dfname; |
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FILE *fp; |
37 |
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int asize; |
38 |
greg |
1.4 |
register int i, j; |
39 |
greg |
1.1 |
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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45 |
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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. |
48 |
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* |
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* The file has the following format: |
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* |
51 |
greg |
1.4 |
* N |
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greg |
1.1 |
* beg0 end0 n0 |
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* beg1 end1 n1 |
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* . . . |
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greg |
1.4 |
* begN endN nN |
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greg |
1.1 |
* data, later dimensions changing faster |
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* . . . |
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* |
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greg |
1.4 |
* 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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greg |
1.6 |
* 0 0 ni p0i p1i .. pni |
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greg |
1.1 |
*/ |
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65 |
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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greg |
1.10 |
if (fgetword(word, sizeof(word), fp) == NULL || !isint(word)) |
80 |
greg |
1.1 |
goto scanerr; |
81 |
greg |
1.10 |
dp->nd = atoi(word); |
82 |
greg |
1.9 |
if (dp->nd <= 0 || dp->nd > MAXDDIM) { |
83 |
greg |
1.1 |
sprintf(errmsg, "bad number of dimensions for \"%s\"", dname); |
84 |
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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++) { |
88 |
greg |
1.10 |
if (fgetword(word, sizeof(word), fp) == NULL || !isflt(word)) |
89 |
greg |
1.6 |
goto scanerr; |
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greg |
1.10 |
dp->dim[i].org = atof(word); |
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if (fgetword(word, sizeof(word), fp) == NULL || !isflt(word)) |
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goto scanerr; |
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dp->dim[i].siz = atof(word); |
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if (fgetword(word, sizeof(word), fp) == NULL || !isint(word)) |
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goto scanerr; |
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dp->dim[i].ne = atoi(word); |
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greg |
1.6 |
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) { |
101 |
greg |
1.4 |
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; |
104 |
greg |
1.10 |
for (j = 0; j < dp->dim[i].ne; j++) { |
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if (fgetword(word, sizeof(word), fp) == NULL || |
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!isflt(word)) |
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greg |
1.4 |
goto scanerr; |
108 |
greg |
1.10 |
dp->dim[i].p[j] = atof(word); |
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} |
110 |
greg |
1.4 |
for (j = 1; j < dp->dim[i].ne-1; j++) |
111 |
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if ((dp->dim[i].p[j-1] < dp->dim[i].p[j]) != |
112 |
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(dp->dim[i].p[j] < dp->dim[i].p[j+1])) |
113 |
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goto scanerr; |
114 |
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dp->dim[i].org = dp->dim[i].p[0]; |
115 |
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dp->dim[i].siz = dp->dim[i].p[dp->dim[i].ne-1] |
116 |
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- dp->dim[i].p[0]; |
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} else |
118 |
greg |
1.6 |
dp->dim[i].p = NULL; |
119 |
greg |
1.1 |
} |
120 |
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if ((dp->arr = (DATATYPE *)malloc(asize*sizeof(DATATYPE))) == NULL) |
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goto memerr; |
122 |
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123 |
greg |
1.10 |
for (i = 0; i < asize; i++) { |
124 |
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if (fgetword(word, sizeof(word), fp) == NULL || !isflt(word)) |
125 |
greg |
1.1 |
goto scanerr; |
126 |
greg |
1.10 |
dp->arr[i] = atof(word); |
127 |
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} |
128 |
greg |
1.1 |
fclose(fp); |
129 |
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dp->next = dlist; |
130 |
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return(dlist = dp); |
131 |
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132 |
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memerr: |
133 |
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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); |
138 |
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} |
139 |
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140 |
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141 |
greg |
1.5 |
static double inpaspect; /* aspect ratio of input picture */ |
142 |
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143 |
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static |
144 |
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headaspect(s) /* check string for aspect ratio */ |
145 |
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char *s; |
146 |
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{ |
147 |
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if (isaspect(s)) |
148 |
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inpaspect *= aspectval(s); |
149 |
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} |
150 |
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151 |
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152 |
greg |
1.1 |
DATARRAY * |
153 |
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getpict(pname) /* get picture pname */ |
154 |
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char *pname; |
155 |
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{ |
156 |
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extern char *libpath; |
157 |
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char *pfname; |
158 |
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FILE *fp; |
159 |
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COLOR *scanin; |
160 |
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int width, height; |
161 |
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int x, y; |
162 |
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register int i; |
163 |
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register DATARRAY *pp; |
164 |
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/* look for array in list */ |
165 |
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for (pp = plist; pp != NULL; pp = pp->next) |
166 |
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if (!strcmp(pname, pp->name)) |
167 |
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return(pp); /* found! */ |
168 |
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169 |
greg |
1.2 |
if ((pfname = getpath(pname, libpath, R_OK)) == NULL) { |
170 |
greg |
1.1 |
sprintf(errmsg, "cannot find picture file \"%s\"", pname); |
171 |
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error(USER, errmsg); |
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} |
173 |
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if ((pp = (DATARRAY *)calloc(3, sizeof(DATARRAY))) == NULL) |
174 |
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goto memerr; |
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176 |
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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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180 |
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if ((fp = fopen(pfname, "r")) == NULL) { |
181 |
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sprintf(errmsg, "cannot open picture file \"%s\"", pfname); |
182 |
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error(SYSTEM, errmsg); |
183 |
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} |
184 |
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/* get dimensions */ |
185 |
greg |
1.5 |
inpaspect = 1.0; |
186 |
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getheader(fp, headaspect); |
187 |
greg |
1.3 |
if (fgetresolu(&width, &height, fp) != (YMAJOR|YDECR)) |
188 |
greg |
1.1 |
goto readerr; |
189 |
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for (i = 0; i < 3; i++) { |
190 |
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pp[i].nd = 2; |
191 |
greg |
1.7 |
pp[i].dim[0].ne = height; |
192 |
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pp[i].dim[1].ne = width; |
193 |
greg |
1.1 |
pp[i].dim[0].org = |
194 |
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pp[i].dim[1].org = 0.0; |
195 |
greg |
1.5 |
if (width <= height*inpaspect) { |
196 |
greg |
1.7 |
pp[i].dim[0].siz = inpaspect*(double)height/width; |
197 |
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pp[i].dim[1].siz = 1.0; |
198 |
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} else { |
199 |
greg |
1.1 |
pp[i].dim[0].siz = 1.0; |
200 |
greg |
1.7 |
pp[i].dim[1].siz = (double)width/height/inpaspect; |
201 |
greg |
1.1 |
} |
202 |
greg |
1.7 |
pp[i].dim[0].p = pp[i].dim[1].p = NULL; |
203 |
greg |
1.1 |
pp[i].arr = (DATATYPE *)malloc(width*height*sizeof(DATATYPE)); |
204 |
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if (pp[i].arr == NULL) |
205 |
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goto memerr; |
206 |
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} |
207 |
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/* load picture */ |
208 |
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if ((scanin = (COLOR *)malloc(width*sizeof(COLOR))) == NULL) |
209 |
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goto memerr; |
210 |
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for (y = height-1; y >= 0; y--) { |
211 |
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if (freadscan(scanin, width, fp) < 0) |
212 |
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goto readerr; |
213 |
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for (x = 0; x < width; x++) |
214 |
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for (i = 0; i < 3; i++) |
215 |
greg |
1.7 |
pp[i].arr[y*width+x] = colval(scanin[x],i); |
216 |
greg |
1.1 |
} |
217 |
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free((char *)scanin); |
218 |
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fclose(fp); |
219 |
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pp[0].next = |
220 |
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pp[1].next = |
221 |
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pp[2].next = plist; |
222 |
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return(plist = pp); |
223 |
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224 |
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memerr: |
225 |
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error(SYSTEM, "out of memory in getpict"); |
226 |
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readerr: |
227 |
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sprintf(errmsg, "bad picture file \"%s\"", pfname); |
228 |
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error(USER, errmsg); |
229 |
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} |
230 |
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231 |
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232 |
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freedata(dname) /* free memory associated with dname */ |
233 |
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char *dname; |
234 |
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{ |
235 |
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register DATARRAY *dp, *dpl; |
236 |
greg |
1.4 |
register int i; |
237 |
greg |
1.1 |
|
238 |
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for (dpl = NULL, dp = dlist; dp != NULL; dpl = dp, dp = dp->next) |
239 |
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if (!strcmp(dname, dp->name)) { |
240 |
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if (dpl == NULL) |
241 |
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dlist = dp->next; |
242 |
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else |
243 |
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dpl->next = dp->next; |
244 |
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free((char *)dp->arr); |
245 |
greg |
1.4 |
for (i = 0; i < dp->nd; i++) |
246 |
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if (dp->dim[i].p != NULL) |
247 |
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free((char *)dp->dim[i].p); |
248 |
greg |
1.1 |
freestr(dp->name); |
249 |
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free((char *)dp); |
250 |
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return; |
251 |
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} |
252 |
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} |
253 |
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254 |
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255 |
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freepict(pname) /* free memory associated with pname */ |
256 |
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char *pname; |
257 |
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{ |
258 |
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register DATARRAY *pp, *ppl; |
259 |
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260 |
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for (ppl = NULL, pp = plist; pp != NULL; ppl = pp, pp = pp->next) |
261 |
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if (!strcmp(pname, pp->name)) { |
262 |
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if (ppl == NULL) |
263 |
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plist = pp->next; |
264 |
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else |
265 |
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ppl->next = pp->next; |
266 |
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free((char *)pp[0].arr); |
267 |
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free((char *)pp[1].arr); |
268 |
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free((char *)pp[2].arr); |
269 |
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freestr(pp[0].name); |
270 |
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free((char *)pp); |
271 |
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return; |
272 |
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} |
273 |
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} |
274 |
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275 |
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276 |
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double |
277 |
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datavalue(dp, pt) /* interpolate data value at a point */ |
278 |
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register DATARRAY *dp; |
279 |
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double *pt; |
280 |
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{ |
281 |
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DATARRAY sd; |
282 |
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int asize; |
283 |
greg |
1.6 |
int lower, upper; |
284 |
greg |
1.1 |
register int i; |
285 |
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double x, y, y0, y1; |
286 |
greg |
1.4 |
/* set up dimensions for recursion */ |
287 |
greg |
1.1 |
sd.nd = dp->nd - 1; |
288 |
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asize = 1; |
289 |
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for (i = 0; i < sd.nd; i++) { |
290 |
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sd.dim[i].org = dp->dim[i+1].org; |
291 |
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sd.dim[i].siz = dp->dim[i+1].siz; |
292 |
greg |
1.4 |
sd.dim[i].p = dp->dim[i+1].p; |
293 |
greg |
1.1 |
asize *= sd.dim[i].ne = dp->dim[i+1].ne; |
294 |
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} |
295 |
greg |
1.4 |
/* get independent variable */ |
296 |
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if (dp->dim[0].p == NULL) { /* evenly spaced points */ |
297 |
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x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz; |
298 |
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x = x * (dp->dim[0].ne - 1); |
299 |
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i = x; |
300 |
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if (i < 0) |
301 |
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i = 0; |
302 |
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else if (i > dp->dim[0].ne - 2) |
303 |
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i = dp->dim[0].ne - 2; |
304 |
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} else { /* unevenly spaced points */ |
305 |
greg |
1.6 |
if (dp->dim[0].siz > 0.0) { |
306 |
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lower = 0; |
307 |
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upper = dp->dim[0].ne; |
308 |
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} else { |
309 |
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lower = dp->dim[0].ne; |
310 |
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upper = 0; |
311 |
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} |
312 |
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do { |
313 |
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i = (lower + upper) >> 1; |
314 |
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if (pt[0] >= dp->dim[0].p[i]) |
315 |
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lower = i; |
316 |
greg |
1.8 |
else |
317 |
greg |
1.6 |
upper = i; |
318 |
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} while (i != (lower + upper) >> 1); |
319 |
greg |
1.8 |
if (i > dp->dim[0].ne - 2) |
320 |
greg |
1.4 |
i = dp->dim[0].ne - 2; |
321 |
|
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x = i + (pt[0] - dp->dim[0].p[i]) / |
322 |
|
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(dp->dim[0].p[i+1] - dp->dim[0].p[i]); |
323 |
|
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} |
324 |
|
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/* get dependent variable */ |
325 |
greg |
1.1 |
if (dp->nd == 1) { |
326 |
|
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y0 = dp->arr[i]; |
327 |
|
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y1 = dp->arr[i+1]; |
328 |
|
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} else { |
329 |
|
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sd.arr = &dp->arr[i*asize]; |
330 |
|
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y0 = datavalue(&sd, pt+1); |
331 |
|
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sd.arr = &dp->arr[(i+1)*asize]; |
332 |
|
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y1 = datavalue(&sd, pt+1); |
333 |
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} |
334 |
|
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/* |
335 |
|
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* Extrapolate as far as one division, then |
336 |
|
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* taper off harmonically to zero. |
337 |
|
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*/ |
338 |
|
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if (x > i+2) |
339 |
|
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y = (2*y1-y0)/(x-i-1); |
340 |
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else if (x < i-1) |
341 |
|
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y = (2*y0-y1)/(i-x); |
342 |
|
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else |
343 |
|
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y = y0*((i+1)-x) + y1*(x-i); |
344 |
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345 |
|
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return(y); |
346 |
|
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} |