papercraft/v3.h

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2014-12-15 04:20:02 +01:00
/** \file
* 3D point operations.
*/
#ifndef _papercraft_v3_h_
#define _papercraft_v3_h_
#include <math.h>
#define EPS 0.0001
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#ifndef M_PI
#define M_PI 3.1415926535897932384
#endif
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typedef struct
{
float p[3];
} v3_t;
static inline int
v3_eq(
const v3_t * v1,
const v3_t * v2
)
{
float dx = v1->p[0] - v2->p[0];
float dy = v1->p[1] - v2->p[1];
float dz = v1->p[2] - v2->p[2];
if (-EPS < dx && dx < EPS
&& -EPS < dy && dy < EPS
&& -EPS < dz && dz < EPS)
return 1;
return 0;
}
static inline double
v3_len(
const v3_t * const v0,
const v3_t * const v1
)
{
float dx = v0->p[0] - v1->p[0];
float dy = v0->p[1] - v1->p[1];
float dz = v0->p[2] - v1->p[2];
return sqrt(dx*dx + dy*dy + dz*dz);
}
static inline v3_t
v3_sub(
v3_t a,
v3_t b
)
{
v3_t c = { .p = {
a.p[0] - b.p[0],
a.p[1] - b.p[1],
a.p[2] - b.p[2],
} };
return c;
}
static inline float
v3_dot(
v3_t a,
v3_t b
)
{
return a.p[0]*b.p[0] + a.p[1]*b.p[1] + a.p[2]*b.p[2];
}
static inline v3_t
v3_cross(
v3_t u,
v3_t v
)
{
float u1 = u.p[0];
float u2 = u.p[1];
float u3 = u.p[2];
float v1 = v.p[0];
float v2 = v.p[1];
float v3 = v.p[2];
v3_t c = { .p = {
u2*v3 - u3*v2,
u3*v1 - u1*v3,
u1*v2 - u2*v1,
}};
return c;
}
#endif