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 */ |