| 165 |
|
register FLOAT *dp; |
| 166 |
|
|
| 167 |
|
datarec.flags = HASBORDER; /* assume border values */ |
| 168 |
< |
size = (m+1)*(n+1)*pointsize; |
| 168 |
> |
datarec.m = m+1; |
| 169 |
> |
datarec.n = n+1; |
| 170 |
> |
size = datarec.m*datarec.n*pointsize; |
| 171 |
|
if (pointsize == 3) |
| 172 |
|
datarec.flags |= TRIPLETS; |
| 173 |
|
dp = (FLOAT *)malloc(size*sizeof(FLOAT)); |
| 198 |
|
if (dp != NULL) |
| 199 |
|
datarec.data = dp; |
| 200 |
|
datarec.flags &= ~HASBORDER; |
| 201 |
+ |
datarec.m = m; |
| 202 |
+ |
datarec.n = n; |
| 203 |
|
size = 0; |
| 204 |
|
} |
| 205 |
< |
if (size || fgetword(word, sizeof(word), fp) != NULL) { |
| 205 |
> |
if (datarec.m < 2 || datarec.n < 2 || size != 0 || |
| 206 |
> |
fgetword(word, sizeof(word), fp) != NULL) { |
| 207 |
|
fputs(file, stderr); |
| 208 |
|
fputs(": bad number of data points\n", stderr); |
| 209 |
|
exit(1); |
| 223 |
|
/* compute coordinates */ |
| 224 |
|
u = argument(1); v = argument(2); |
| 225 |
|
if (datarec.flags & HASBORDER) { |
| 226 |
< |
i = u *= datarec.m; |
| 227 |
< |
j = v *= datarec.n; |
| 226 |
> |
i = u *= datarec.m-1; |
| 227 |
> |
j = v *= datarec.n-1; |
| 228 |
|
} else { |
| 229 |
< |
i = u = u*(datarec.m+1) - .5; |
| 230 |
< |
j = v = v*(datarec.n+1) - .5; |
| 229 |
> |
i = u = u*datarec.m - .5; |
| 230 |
> |
j = v = v*datarec.n - .5; |
| 231 |
|
} |
| 232 |
|
if (i < 0) i = 0; |
| 233 |
|
else if (i > datarec.m-2) i = datarec.m-2; |
| 235 |
|
else if (j > datarec.n-2) j = datarec.n-2; |
| 236 |
|
/* compute value */ |
| 237 |
|
if (datarec.flags & TRIPLETS) { |
| 238 |
< |
dp = datarec.data + 3*(j*datarec.n + i); |
| 239 |
< |
if (nam == YNAME) |
| 235 |
< |
dp++; |
| 236 |
< |
else if (nam == ZNAME) |
| 238 |
> |
dp = datarec.data + 3*(j*datarec.m + i); |
| 239 |
> |
if (nam == ZNAME) |
| 240 |
|
dp += 2; |
| 241 |
+ |
else if (nam == YNAME) |
| 242 |
+ |
dp++; |
| 243 |
|
d00 = dp[0]; d01 = dp[3]; |
| 244 |
< |
dp += 3*datarec.n; |
| 244 |
> |
dp += 3*datarec.m; |
| 245 |
|
d10 = dp[0]; d11 = dp[3]; |
| 246 |
|
} else { |
| 247 |
< |
dp = datarec.data + j*datarec.n + i; |
| 247 |
> |
dp = datarec.data + j*datarec.m + i; |
| 248 |
|
d00 = dp[0]; d01 = dp[1]; |
| 249 |
< |
dp += datarec.n; |
| 249 |
> |
dp += datarec.m; |
| 250 |
|
d10 = dp[0]; d11 = dp[1]; |
| 251 |
|
} |
| 252 |
|
/* bilinear interpolation */ |
