PostGIS  2.5.0dev-r@@SVN_REVISION@@

◆ ptarray_locate_along_linear()

static int ptarray_locate_along_linear ( const POINTARRAY pa,
double  m,
POINT4D p,
uint32_t  from 
)
static

Definition at line 1050 of file lwlinearreferencing.c.

References getPoint4d_p(), LW_TRUE, POINTARRAY::npoints, and segment_locate_along().

Referenced by lwgeom_cpa_within(), and lwgeom_tcpa().

1051 {
1052  uint32_t i = from;
1053  POINT4D p1, p2;
1054 
1055  /* Walk through each segment in the point array */
1056  getPoint4d_p(pa, i, &p1);
1057  for ( i = from+1; i < pa->npoints; i++ )
1058  {
1059  getPoint4d_p(pa, i, &p2);
1060 
1061  if ( segment_locate_along(&p1, &p2, m, 0, p) == LW_TRUE )
1062  return i-1; /* found */
1063 
1064  p1 = p2;
1065  }
1066 
1067  return -1; /* not found */
1068 }
static int segment_locate_along(const POINT4D *p1, const POINT4D *p2, double m, double offset, POINT4D *pn)
unsigned int uint32_t
Definition: uthash.h:78
#define LW_TRUE
Return types for functions with status returns.
Definition: liblwgeom.h:75
int getPoint4d_p(const POINTARRAY *pa, uint32_t n, POINT4D *point)
Definition: lwgeom_api.c:113
uint32_t npoints
Definition: liblwgeom.h:370
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