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# Copyright (C) 2021-2023 Koen Derks
# 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 3 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.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#' Canvas Theme for ggplot2 Objects
#'
#' @description Add a canvas theme to the plot. The canvas theme by default has no margins and fills any empty canvas with a background color.
#'
#' @usage theme_canvas(x, background = NULL, margin = 0)
#'
#' @param x a ggplot2 object.
#' @param background a character specifying the color used for the empty canvas.
#' @param margin margins of the canvas.
#'
#' @return A \code{ggplot} object containing the artwork.
#'
#' @author Koen Derks, \email{koen-derks@hotmail.com}
#'
#' @keywords canvas theme
#'
#' @export
theme_canvas <- function(x, background = NULL, margin = 0) {
x <- x + ggplot2::theme(
axis.title = ggplot2::element_blank(),
axis.text = ggplot2::element_blank(),
axis.ticks = ggplot2::element_blank(),
axis.line = ggplot2::element_blank(),
legend.position = "none",
plot.background = ggplot2::element_rect(fill = background, colour = background),
panel.border = ggplot2::element_blank(),
panel.grid = ggplot2::element_blank(),
plot.margin = ggplot2::unit(rep(margin, 4), "lines"),
strip.background = ggplot2::element_blank(),
strip.text = ggplot2::element_blank()
)
if (is.null(background)) {
x <- x + ggplot2::theme(panel.background = ggplot2::element_rect(fill = NA, colour = NA))
} else {
x <- x + ggplot2::theme(panel.background = ggplot2::element_rect(fill = background, colour = background))
}
return(x)
}
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