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#include "standard.h" |
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< |
#define XNAME "X_" /* x function name */ |
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#define YNAME "Y_" /* y function name */ |
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#define ZNAME "Z_" /* z function name */ |
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char XNAME[] = "X`SYS`"; /* x function name */ |
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char YNAME[] = "Y`SYS`"; /* y function name */ |
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char ZNAME[] = "Z`SYS`"; /* z function name */ |
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#define ABS(x) ((x)>=0 ? (x) : -(x)) |
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char *modname, *surfname; |
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double funvalue(), l_hermite(), l_bezier(), l_bspline(), argument(); |
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/* recorded data flags */ |
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#define HASBORDER 01 |
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#define TRIPLETS 02 |
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/* a data structure */ |
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struct { |
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int flags; /* data type */ |
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short m, n; /* number of s and t values */ |
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FLOAT *data; /* the data itself, s major sort */ |
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} datarec; /* our recorded data */ |
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double l_hermite(), l_bezier(), l_bspline(), l_dataval(); |
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extern double funvalue(), argument(); |
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|
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typedef struct { |
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FVECT p; /* vertex position */ |
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FVECT n; /* average normal */ |
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modname = argv[1]; |
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surfname = argv[2]; |
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sprintf(stmp, "%s(s,t)=%s;", XNAME, argv[3]); |
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scompile(stmp, NULL, 0); |
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sprintf(stmp, "%s(s,t)=%s;", YNAME, argv[4]); |
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scompile(stmp, NULL, 0); |
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sprintf(stmp, "%s(s,t)=%s;", ZNAME, argv[5]); |
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scompile(stmp, NULL, 0); |
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m = atoi(argv[6]); |
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n = atoi(argv[7]); |
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if (m <= 0 || n <= 0) |
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goto userror; |
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if (!strcmp(argv[5], "-") || access(argv[5], 4) == 0) { /* file? */ |
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funset(ZNAME, 2, ':', l_dataval); |
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if (!strcmp(argv[5],argv[3]) && !strcmp(argv[5],argv[4])) { |
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loaddata(argv[5], m, n, 3); |
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funset(XNAME, 2, ':', l_dataval); |
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funset(YNAME, 2, ':', l_dataval); |
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} else { |
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loaddata(argv[5], m, n, 1); |
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sprintf(stmp, "%s(s,t)=%s;", XNAME, argv[3]); |
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scompile(stmp, NULL, 0); |
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sprintf(stmp, "%s(s,t)=%s;", YNAME, argv[4]); |
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scompile(stmp, NULL, 0); |
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} |
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} else { |
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sprintf(stmp, "%s(s,t)=%s;", XNAME, argv[3]); |
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scompile(stmp, NULL, 0); |
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sprintf(stmp, "%s(s,t)=%s;", YNAME, argv[4]); |
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scompile(stmp, NULL, 0); |
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sprintf(stmp, "%s(s,t)=%s;", ZNAME, argv[5]); |
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scompile(stmp, NULL, 0); |
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} |
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row0 = (POINT *)malloc((n+3)*sizeof(POINT)); |
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row1 = (POINT *)malloc((n+3)*sizeof(POINT)); |
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row2 = (POINT *)malloc((n+3)*sizeof(POINT)); |
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fprintf(stderr, "Usage: %s material name ", argv[0]); |
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fprintf(stderr, "x(s,t) y(s,t) z(s,t) m n [-s][-e expr][-f file]\n"); |
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quit(1); |
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} |
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loaddata(file, m, n, pointsize) /* load point data from file */ |
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char *file; |
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int m, n; |
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int pointsize; |
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{ |
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extern char *fgetword(); |
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FILE *fp; |
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char word[64]; |
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register int size; |
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register FLOAT *dp; |
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|
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datarec.flags = HASBORDER; /* assume border values */ |
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size = (m+1)*(n+1)*pointsize; |
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if (pointsize == 3) |
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datarec.flags |= TRIPLETS; |
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dp = (FLOAT *)malloc(size*sizeof(FLOAT)); |
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if ((datarec.data = dp) == NULL) { |
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fputs("Out of memory\n", stderr); |
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exit(1); |
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} |
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if (!strcmp(file, "-")) { |
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file = "<stdin>"; |
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fp = stdin; |
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} else if ((fp = fopen(file, "r")) == NULL) { |
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fputs(file, stderr); |
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fputs(": cannot open\n", stderr); |
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exit(1); |
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} |
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while (size > 0 && fgetword(word, sizeof(word), fp) != NULL) { |
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if (!isflt(word)) { |
186 |
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fprintf(stderr, "%s: garbled data value: %s\n", |
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file, word); |
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exit(1); |
189 |
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} |
190 |
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*dp++ = atof(word); |
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+ |
size--; |
192 |
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} |
193 |
+ |
if (size == (m+n+1)*pointsize) { /* no border after all */ |
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+ |
dp = (FLOAT *)realloc((char *)datarec.data, |
195 |
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m*n*pointsize*sizeof(FLOAT)); |
196 |
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if (dp != NULL) |
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datarec.data = dp; |
198 |
+ |
datarec.flags &= ~HASBORDER; |
199 |
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size = 0; |
200 |
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} |
201 |
+ |
if (size || fgetword(word, sizeof(word), fp) != NULL) { |
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fputs(file, stderr); |
203 |
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fputs(": bad number of data points\n", stderr); |
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+ |
exit(1); |
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} |
206 |
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fclose(fp); |
207 |
+ |
} |
208 |
+ |
|
209 |
+ |
|
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double |
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l_dataval(nam) /* return recorded data value */ |
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+ |
char *nam; |
213 |
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{ |
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double u, v; |
215 |
+ |
register int i, j; |
216 |
+ |
register FLOAT *dp; |
217 |
+ |
double d00, d01, d10, d11; |
218 |
+ |
/* compute coordinates */ |
219 |
+ |
u = argument(1); v = argument(2); |
220 |
+ |
if (datarec.flags & HASBORDER) { |
221 |
+ |
i = u *= datarec.m; |
222 |
+ |
j = v *= datarec.n; |
223 |
+ |
} else { |
224 |
+ |
i = u = u*(datarec.m+1) - .5; |
225 |
+ |
j = v = v*(datarec.n+1) - .5; |
226 |
+ |
} |
227 |
+ |
if (i < 0) i = 0; |
228 |
+ |
else if (i > datarec.m-2) i = datarec.m-2; |
229 |
+ |
if (j < 0) j = 0; |
230 |
+ |
else if (j > datarec.n-2) j = datarec.n-2; |
231 |
+ |
/* compute value */ |
232 |
+ |
if (datarec.flags & TRIPLETS) { |
233 |
+ |
dp = datarec.data + 3*(j*datarec.n + i); |
234 |
+ |
if (nam == YNAME) |
235 |
+ |
dp++; |
236 |
+ |
else if (nam == ZNAME) |
237 |
+ |
dp += 2; |
238 |
+ |
d00 = dp[0]; d01 = dp[3]; |
239 |
+ |
dp += 3*datarec.n; |
240 |
+ |
d10 = dp[0]; d11 = dp[3]; |
241 |
+ |
} else { |
242 |
+ |
dp = datarec.data + j*datarec.n + i; |
243 |
+ |
d00 = dp[0]; d01 = dp[1]; |
244 |
+ |
dp += datarec.n; |
245 |
+ |
d10 = dp[0]; d11 = dp[1]; |
246 |
+ |
} |
247 |
+ |
/* bilinear interpolation */ |
248 |
+ |
return((j+1-v)*((i+1-u)*d00+(u-i)*d01)+(v-j)*((i+1-u)*d10+(u-i)*d11)); |
249 |
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} |
250 |
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