ptarray_locate_along_linear()

static int ptarray_locate_along_linear ( const POINTARRAY *  pa, double  m, POINT4D *  p, int  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().

{
        int i = from;
        POINT4D p1, p2;

        /* Walk through each segment in the point array */
        getPoint4d_p(pa, i, &p1);
        for ( i = from+1; i < pa->npoints; i++ )
        {
                getPoint4d_p(pa, i, &p2);

                if ( segment_locate_along(&p1, &p2, m, 0, p) == LW_TRUE )
                        return i-1; /* found */

                p1 = p2;
        }

        return -1; /* not found */
}

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