| # File src/library/grid/R/origin.R |
| # Part of the R package, https://www.R-project.org |
| # |
| # Copyright (C) 1995-2013 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/ |
| |
| valid.origin <- function(origin) { |
| origin <- as.integer(match(origin, |
| c("bottom.left", "top.left", |
| "bottom.right", "top.right")) - 1) |
| if (anyNA(origin)) |
| stop("invalid 'origin'") |
| origin |
| } |
| |
| origin.left <- function(origin) { |
| switch (origin, |
| bottom.left = TRUE, |
| bottom.right = FALSE, |
| top.left = TRUE, |
| top.right = FALSE) |
| } |
| |
| origin.right <- function(origin) { |
| switch (origin, |
| bottom.left = FALSE, |
| bottom.right = TRUE, |
| top.left = FALSE, |
| top.right = TRUE) |
| } |
| |
| origin.bottom <- function(origin) { |
| switch (origin, |
| bottom.left = TRUE, |
| bottom.right = TRUE, |
| top.left = FALSE, |
| top.right = FALSE) |
| } |
| |
| origin.top <- function(origin) { |
| switch (origin, |
| bottom.left = FALSE, |
| bottom.right = FALSE, |
| top.left = TRUE, |
| top.right = TRUE) |
| } |
| |
| swap.origin.horizontal <- function(origin) { |
| switch (origin, |
| bottom.left = "bottom.right", |
| bottom.right = "bottom.left", |
| top.left = "top.right", |
| top.right = "top.left") |
| } |
| |
| swap.origin.vertical <- function(origin) { |
| switch (origin, |
| bottom.left = "top.left", |
| bottom.right = "top.right", |
| top.left = "bottom.left", |
| top.right = "bottom.right") |
| } |