16 |
|
* 4/3/87 |
17 |
|
*/ |
18 |
|
|
19 |
< |
#include <stdio.h> |
20 |
< |
#include "fvect.h" |
19 |
> |
#include "standard.h" |
20 |
|
|
21 |
|
#define XNAME "X_" /* x function name */ |
22 |
|
#define YNAME "Y_" /* y function name */ |
23 |
|
#define ZNAME "Z_" /* z function name */ |
24 |
|
|
26 |
– |
#define PI 3.14159265358979323846 |
27 |
– |
|
28 |
– |
#define FTINY 1e-7 |
29 |
– |
|
25 |
|
#define ABS(x) ((x)>=0 ? (x) : -(x)) |
26 |
|
|
27 |
|
#define pvect(p) printf(vformat, (p)[0], (p)[1], (p)[2]) |
34 |
|
|
35 |
|
char *modname, *surfname; |
36 |
|
|
37 |
< |
double funvalue(), l_hermite(), argument(); |
37 |
> |
double funvalue(), l_hermite(), l_bezier(), argument(); |
38 |
|
|
39 |
|
typedef struct { |
40 |
|
FVECT p; /* vertex position */ |
52 |
|
|
53 |
|
varset("PI", PI); |
54 |
|
funset("hermite", 5, l_hermite); |
55 |
+ |
funset("bezier", 5, l_bezier); |
56 |
|
|
57 |
|
if (argc < 8) |
58 |
|
goto userror; |
330 |
|
register int i,j,k; |
331 |
|
register double temp; |
332 |
|
|
333 |
< |
bcopy(mat, m4tmp, sizeof(m4tmp)); |
333 |
> |
bcopy((char *)mat, (char *)m4tmp, sizeof(m4tmp)); |
334 |
|
/* set inverse to identity */ |
335 |
|
for (i = 0; i < 4; i++) |
336 |
|
for (j = 0; j < 4; j++) |
416 |
|
argument(2)*(-2.0*t+3.0)*t*t + |
417 |
|
argument(3)*((t-2.0)*t+1.0)*t + |
418 |
|
argument(4)*(t-1.0)*t*t ); |
419 |
+ |
} |
420 |
+ |
|
421 |
+ |
|
422 |
+ |
double |
423 |
+ |
l_bezier() |
424 |
+ |
{ |
425 |
+ |
double t; |
426 |
+ |
|
427 |
+ |
t = argument(5); |
428 |
+ |
return( argument(1) * (1.+t*(-3.+t*(3.-t))) + |
429 |
+ |
argument(2) * 3.*t*(1.+t*(-2.+t)) + |
430 |
+ |
argument(3) * 3.*t*t*(1.-t) + |
431 |
+ |
argument(4) * t*t*t ); |
432 |
|
} |