PostGIS  2.5.0dev-r@@SVN_REVISION@@
void interpolate_point4d ( const POINT4D A,
const POINT4D B,
POINT4D I,
double  F 
)

Find interpolation point I between point A and point B so that the len(AI) == len(AB)*F and I falls on AB segment.

Example:

F=0.5 : A-—I-—B F=1 : A------—B==I F=0 : A==I------—B F=.2 : A-I----—B

Definition at line 704 of file lwgeom_api.c.

References lwerror(), POINT4D::m, POINT4D::x, POINT4D::y, and POINT4D::z.

Referenced by lwline_interpolate_points(), and ptarray_substring().

705 {
706 #if PARANOIA_LEVEL > 0
707  if (F < 0 || F > 1) lwerror("interpolate_point4d: invalid F (%g)", F);
708 #endif
709  I->x=A->x+((B->x-A->x)*F);
710  I->y=A->y+((B->y-A->y)*F);
711  I->z=A->z+((B->z-A->z)*F);
712  I->m=A->m+((B->m-A->m)*F);
713 }
double x
Definition: liblwgeom.h:351
double m
Definition: liblwgeom.h:351
double z
Definition: liblwgeom.h:351
double y
Definition: liblwgeom.h:351
void lwerror(const char *fmt,...)
Write a notice out to the error handler.
Definition: lwutil.c:190

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