ST_Square()

Datum ST_Square

(

PG_FUNCTION_ARGS

)

Definition at line 387 of file lwgeom_generate_grid.c.

{
        LWPOINT *lwpt;
        double size = PG_GETARG_FLOAT8(0);
        GSERIALIZED *gsqr;
        int cell_i = PG_GETARG_INT32(1);
        int cell_j = PG_GETARG_INT32(2);
        GSERIALIZED *gorigin = PG_GETARG_GSERIALIZED_P(3);
        LWGEOM *lwsqr;
        LWGEOM *lworigin = lwgeom_from_gserialized(gorigin);
 
        if (lwgeom_is_empty(lworigin))
        {
                elog(ERROR, "%s: origin point is empty", __func__);
                PG_RETURN_NULL();
        }
 
        lwpt = lwgeom_as_lwpoint(lworigin);
        if (!lwpt)
        {
                elog(ERROR, "%s: origin argument is not a point", __func__);
                PG_RETURN_NULL();
        }
 
        lwsqr = square(lwpoint_get_x(lwpt), lwpoint_get_y(lwpt),
                       size, cell_i, cell_j,
                           lwgeom_get_srid(lworigin));
 
        gsqr = geometry_serialize(lwsqr);
        PG_FREE_IF_COPY(gorigin, 3);
        PG_RETURN_POINTER(gsqr);
}

References lwgeom_as_lwpoint(), lwgeom_from_gserialized(), lwgeom_get_srid(), lwgeom_is_empty(), lwpoint_get_x(), lwpoint_get_y(), and square().

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