31 |
|
delta[0] = p2[0] - p1[0]; |
32 |
|
delta[1] = p2[1] - p1[1]; |
33 |
|
delta[2] = p2[2] - p1[2]; |
34 |
+ |
|
35 |
|
return(DOT(delta, delta)); |
36 |
|
} |
37 |
|
|
45 |
|
|
46 |
|
d = dist2(ep1, ep2); |
47 |
|
d1 = dist2(ep1, p); |
48 |
< |
d2 = dist2(ep2, p); |
48 |
> |
d2 = d + d1 - dist2(ep2, p); |
49 |
|
|
50 |
< |
return(d1 - (d+d1-d2)*(d+d1-d2)/d/4); |
50 |
> |
return(d1 - 0.25*d2*d2/d); |
51 |
|
} |
52 |
|
|
53 |
|
|
69 |
|
if (d1 - d2 > d) |
70 |
|
return(d2); |
71 |
|
} |
72 |
+ |
d2 = d + d1 - d2; |
73 |
|
|
74 |
< |
return(d1 - (d+d1-d2)*(d+d1-d2)/d/4); /* distance to line */ |
74 |
> |
return(d1 - 0.25*d2*d2/d); /* distance to line */ |
75 |
|
} |
76 |
|
|
77 |
|
|
85 |
|
|
86 |
|
|
87 |
|
fvsum(vres, v0, v1, f) /* vres = v0 + f*v1 */ |
88 |
< |
FVECT vres, v0, v1; |
89 |
< |
double f; |
88 |
> |
register FVECT vres, v0, v1; |
89 |
> |
register double f; |
90 |
|
{ |
91 |
|
vres[0] = v0[0] + f*v1[0]; |
92 |
|
vres[1] = v0[1] + f*v1[1]; |
98 |
|
normalize(v) /* normalize a vector, return old magnitude */ |
99 |
|
register FVECT v; |
100 |
|
{ |
101 |
< |
register double len; |
101 |
> |
register double len, d; |
102 |
|
|
103 |
< |
len = DOT(v, v); |
103 |
> |
d = DOT(v, v); |
104 |
|
|
105 |
< |
if (len <= 0.0) |
105 |
> |
if (d <= 0.0) |
106 |
|
return(0.0); |
107 |
|
|
108 |
< |
if (len <= 1.0+FTINY && len >= 1.0-FTINY) |
109 |
< |
len = 0.5 + 0.5*len; /* first order approximation */ |
108 |
> |
if (d <= 1.0+FTINY && d >= 1.0-FTINY) |
109 |
> |
len = 0.5 + 0.5*d; /* first order approximation */ |
110 |
|
else |
111 |
< |
len = sqrt(len); |
111 |
> |
len = sqrt(d); |
112 |
|
|
113 |
< |
v[0] /= len; |
114 |
< |
v[1] /= len; |
115 |
< |
v[2] /= len; |
113 |
> |
v[0] *= d = 1.0/len; |
114 |
> |
v[1] *= d; |
115 |
> |
v[2] *= d; |
116 |
|
|
117 |
|
return(len); |
118 |
|
} |