ST_3DLineInterpolatePoint()

Datum ST_3DLineInterpolatePoint

(

PG_FUNCTION_ARGS

)

Definition at line 228 of file lwgeom_functions_analytic.c.

{
        GSERIALIZED *gser = PG_GETARG_GSERIALIZED_P(0);
        GSERIALIZED *result;
        double distance = PG_GETARG_FLOAT8(1);
        LWLINE *line;
        LWGEOM *geom;
        LWPOINT *point;
 
        if (distance < 0 || distance > 1)
        {
                elog(ERROR, "line_interpolate_point: 2nd arg isn't within [0,1]");
                PG_RETURN_NULL();
        }
 
        if (gserialized_get_type(gser) != LINETYPE)
        {
                elog(ERROR, "line_interpolate_point: 1st arg isn't a line");
                PG_RETURN_NULL();
        }
 
        geom = lwgeom_from_gserialized(gser);
        line = lwgeom_as_lwline(geom);
 
        point = lwline_interpolate_point_3d(line, distance);
 
        lwgeom_free(geom);
        PG_FREE_IF_COPY(gser, 0);
 
        result = geometry_serialize(lwpoint_as_lwgeom(point));
        lwpoint_free(point);
 
        PG_RETURN_POINTER(result);
}

References distance(), gserialized_get_type(), LINETYPE, lwgeom_as_lwline(), lwgeom_free(), lwgeom_from_gserialized(), lwline_interpolate_point_3d(), lwpoint_as_lwgeom(), lwpoint_free(), and result.

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