geography_line_locate_point()

Datum geography_line_locate_point

(

PG_FUNCTION_ARGS

)

Definition at line 1349 of file geography_measurement.c.

{
        GSERIALIZED *gs1 = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED *gs2 = PG_GETARG_GSERIALIZED_P(1);
        bool use_spheroid = PG_GETARG_BOOL(2);
        double tolerance = FP_TOLERANCE;
        SPHEROID s;
        LWLINE *lwline;
        LWPOINT *lwpoint;
        POINTARRAY *pa;
        POINT4D p, p_proj;
        double ret;
 
        gserialized_error_if_srid_mismatch(gs1, gs2, __func__);
 
        /* Return NULL on empty argument. */
        if ( gserialized_is_empty(gs1) || gserialized_is_empty(gs2))
        {
                PG_FREE_IF_COPY(gs1, 0);
                PG_FREE_IF_COPY(gs2, 1);
                PG_RETURN_NULL();
        }
 
        if ( gserialized_get_type(gs1) != LINETYPE )
        {
                elog(ERROR,"%s: 1st arg is not a line", __func__);
                PG_RETURN_NULL();
        }
        if ( gserialized_get_type(gs2) != POINTTYPE )
        {
                elog(ERROR,"%s: 2st arg is not a point", __func__);
                PG_RETURN_NULL();
        }
 
        /* Set to sphere if requested */
        if ( ! use_spheroid ) {
                s.a = s.b = s.radius;
        }
        else {
                /* Initialize spheroid */
                spheroid_init_from_srid(gserialized_get_srid(gs1), &s);
        }
 
        lwline = lwgeom_as_lwline(lwgeom_from_gserialized(gs1));
        lwpoint = lwgeom_as_lwpoint(lwgeom_from_gserialized(gs2));
 
        pa = lwline->points;
        lwpoint_getPoint4d_p(lwpoint, &p);
 
        ret = ptarray_locate_point_spheroid(pa, &p, &s, tolerance, NULL, &p_proj);
 
        PG_RETURN_FLOAT8(ret);
}

References FP_TOLERANCE, gserialized_error_if_srid_mismatch(), gserialized_get_srid(), gserialized_get_type(), gserialized_is_empty(), LINETYPE, lwgeom_as_lwline(), lwgeom_as_lwpoint(), lwgeom_from_gserialized(), lwpoint_getPoint4d_p(), LWLINE::points, POINTTYPE, ptarray_locate_point_spheroid(), and s.

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