LWGEOM_line_locate_point()

Datum LWGEOM_line_locate_point

(

PG_FUNCTION_ARGS

)

Definition at line 219 of file lwgeom_functions_lrs.c.

References error_if_srid_mismatch(), gserialized_get_srid(), gserialized_get_type(), LINETYPE, lwgeom_as_lwline(), lwgeom_as_lwpoint(), lwgeom_from_gserialized(), lwpoint_getPoint4d_p(), LWLINE::points, POINTTYPE, and ptarray_locate_point().

Referenced by ST_InterpolatePoint().

{
        GSERIALIZED *geom1 = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED *geom2 = PG_GETARG_GSERIALIZED_P(1);
        LWLINE *lwline;
        LWPOINT *lwpoint;
        POINTARRAY *pa;
        POINT4D p, p_proj;
        double ret;

        if ( gserialized_get_type(geom1) != LINETYPE )
        {
                elog(ERROR,"line_locate_point: 1st arg isn't a line");
                PG_RETURN_NULL();
        }
        if ( gserialized_get_type(geom2) != POINTTYPE )
        {
                elog(ERROR,"line_locate_point: 2st arg isn't a point");
                PG_RETURN_NULL();
        }

        error_if_srid_mismatch(gserialized_get_srid(geom1), gserialized_get_srid(geom2));

        lwline = lwgeom_as_lwline(lwgeom_from_gserialized(geom1));
        lwpoint = lwgeom_as_lwpoint(lwgeom_from_gserialized(geom2));

        pa = lwline->points;
        lwpoint_getPoint4d_p(lwpoint, &p);

        ret = ptarray_locate_point(pa, &p, NULL, &p_proj);

        PG_RETURN_FLOAT8(ret);
}

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