ST_Scroll()

Datum ST_Scroll

(

PG_FUNCTION_ARGS

)

Definition at line 1117 of file lwgeom_functions_basic.c.

{
        Datum datum_line, datum_point;
        GSERIALIZED *ser_line, *ser_point;
        LWGEOM *lwgeom_line, *lwgeom_point;
        LWLINE *line;
        LWPOINT *point;
        POINT4D p;
        GSERIALIZED *ser_out;
        int rv;
 
        POSTGIS_DEBUG(2, "ST_Scroll called.");
 
        datum_line = PG_GETARG_DATUM(0);
        datum_point = PG_GETARG_DATUM(1);
 
        ser_line = ((GSERIALIZED *)PG_DETOAST_DATUM(datum_line));
        lwgeom_line = lwgeom_from_gserialized(ser_line);
        line = lwgeom_as_lwline(lwgeom_line);
        if ( ! line ) {
                lwpgerror("First argument must be a line");
                PG_RETURN_NULL();
        }
 
        ser_point = ((GSERIALIZED *)PG_DETOAST_DATUM(datum_point));
        lwgeom_point = lwgeom_from_gserialized(ser_point);
        point = lwgeom_as_lwpoint(lwgeom_point);
        if ( ! point ) {
                lwpgerror("Second argument must be a point");
                PG_RETURN_NULL();
        }
        if ( ! lwpoint_getPoint4d_p(point, &p) ) {
                lwpgerror("Second argument must be a non-empty point");
                PG_RETURN_NULL();
        }
 
        rv = ptarray_scroll_in_place(line->points, &p);
        if ( LW_FAILURE == rv ) {
                PG_RETURN_NULL();
        }
 
        ser_out = geometry_serialize(lwgeom_line);
 
        lwgeom_free(lwgeom_point);
        PG_FREE_IF_COPY(ser_line, 0);
        PG_FREE_IF_COPY(ser_point, 0);
 
        PG_RETURN_POINTER(ser_out);
}

References LW_FAILURE, lwgeom_as_lwline(), lwgeom_as_lwpoint(), lwgeom_free(), lwgeom_from_gserialized(), lwpoint_getPoint4d_p(), LWLINE::points, and ptarray_scroll_in_place().

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