| # File src/library/grid/R/util.R |
| # Part of the R package, https://www.R-project.org |
| # |
| # Copyright (C) 1995-2016 The R Core Team |
| # |
| # This program is free software; you can redistribute it and/or modify |
| # it under the terms of the GNU General Public License as published by |
| # the Free Software Foundation; either version 2 of the License, or |
| # (at your option) any later version. |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # A copy of the GNU General Public License is available at |
| # https://www.R-project.org/Licenses/ |
| |
| |
| # Define a convenience function that is easy to call from C code |
| grid.top.level.vp <- function() { |
| vp <- viewport(clip=TRUE, name="ROOT") |
| # Must mimic order of events in push.vp.viewport() |
| # In particular, add 'gpar' and 'parentgpar' IN THE RIGHT ORDER |
| # before calling pushedvp() |
| vp$parentgpar <- gpar() |
| vp$gpar <- gpar() |
| pushedvp(vp) |
| } |
| |
| # An accessor for getting at the grid global state structure |
| # to make debugging easier for me; all I have to type is grid:::STATE() |
| STATE <- function() { |
| get(".GRID.STATE", envir=.GridEvalEnv) |
| } |
| |
| is.even <- function(x) x %% 2 == 0 |
| |
| is.odd <- function(x) !is.even(x) |
| |
| |
| grid.pretty <- function(range) { |
| if (!is.numeric(range)) |
| stop("'range' must be numeric") |
| .Call(C_pretty, range) |
| } |
| |