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is_cairo_installed <- function() requireNamespace('Cairo', quietly = TRUE)
# checking capability of X11 is slow, the short circult logic avoids
# this if any other devices are found.
check_capability <- function(dev) {
devices <- c(dev, 'aqua', 'cairo', 'X11')
for (d in devices) {
if (capabilities(d)) return(TRUE)
}
FALSE
}
plot_title <- function(p, default = NULL) {
for (call in rev(p[[1]])) {
args <- call[[2]]
if (isTRUE(args[[1]]$name == 'C_title') && !is.null(args[[2]])) {
return(args[[2]])
}
}
default
}
#' Plot representations
#'
#' \code{repr_text.recordedplot} only returns a small info string containing the title (if any)
#' while the others return a character vector (SVG) or a raw vector (the rest) containing the image data.
#'
#' All parameters can also be specified using the eponymous \code{repr.plot.*} \link{repr-options}.
#'
#' @param obj The plot to create a representation for
#' @param width Plot area width in inches (default: 7)
#' @param height Plot area height in inches (default: 7)
#' @param bg Background color (default: white)
#' @param pointsize Text height in pt (default: 12)
#' @param antialias Which kind of antialiasing to use for for lines and text? 'gray', 'subpixel' or 'none'? (default: gray)
#' @param res For PNG and JPEG, specifies the PPI for rasterization (default: 120)
#' @param quality For JPEG, determines the compression quality in \% (default: 90)
#' @param family Font family for SVG and PDF. 'sans', 'serif', 'mono' or a specific one (default: sans)
#' @param ... ignored
#'
#' @examples
#' dev.new()
#' dev.control(displaylist = 'enable')
#' plot(sqrt, main = 'Square root')
#' p <- recordPlot()
#' dev.off()
#'
#' repr_text(p)
#'
#' @name repr_*.recordedplot
#' @export
repr_text.recordedplot <- function(obj, ...) {
title <- plot_title(obj)
if (is.null(title)) {
'plot without title'
} else {
sprintf('Plot with title %s', dQuote(title))
}
}
#' @importFrom grDevices replayPlot dev.off
repr_recordedplot_generic <- function(obj, ext, binary, dev.cb) {
tf <- tempfile(fileext = ext)
dev.cb(tf)
replayPlot(obj)
dev.off()
if (binary)
readBin(tf, raw(), file.info(tf)$size)
else
readChar(tf, file.info(tf)$size, useBytes = TRUE)
}
### BITMAPS ###
#' @name repr_*.recordedplot
#' @importFrom grDevices png
#' @export
repr_png.recordedplot <- function(obj,
width = getOption('repr.plot.width'),
height = getOption('repr.plot.height'),
bg = getOption('repr.plot.bg'),
pointsize = getOption('repr.plot.pointsize'),
antialias = getOption('repr.plot.antialias'),
#special
res = getOption('repr.plot.res'),
...) {
if (!is_cairo_installed() && !check_capability('png')) return(NULL)
dev.cb <- function(tf)
if (is_cairo_installed())
Cairo::Cairo(width, height, tf, 'png', pointsize, bg, 'transparent', 'in', res)
else
png(tf, width, height, 'in', pointsize, bg, res, antialias = antialias)
repr_recordedplot_generic(obj, '.png', TRUE, dev.cb)
}
#' @name repr_*.recordedplot
#' @importFrom grDevices jpeg
#' @export
repr_jpg.recordedplot <- function(obj,
width = getOption('repr.plot.width'),
height = getOption('repr.plot.height'),
bg = getOption('repr.plot.bg'),
pointsize = getOption('repr.plot.pointsize'),
antialias = getOption('repr.plot.antialias'),
#special
res = getOption('repr.plot.res'),
quality = getOption('repr.plot.quality'),
...) {
if (!is_cairo_installed() && !check_capability('jpeg')) return(NULL)
dev.cb <- function(tf)
if (is_cairo_installed())
Cairo::Cairo(width, height, tf, 'jpeg', pointsize, bg, 'transparent', 'in', res, quality = quality)
else
jpeg(tf, width, height, 'in', pointsize, quality, bg, res, antialias = antialias)
repr_recordedplot_generic(obj, '.jpg', TRUE, dev.cb)
}
### VECTOR ###
#' @name repr_*.recordedplot
#' @importFrom grDevices svg
#' @export
repr_svg.recordedplot <- function(obj,
width = getOption('repr.plot.width'),
height = getOption('repr.plot.height'),
bg = getOption('repr.plot.bg'),
pointsize = getOption('repr.plot.pointsize'),
antialias = getOption('repr.plot.antialias'),
#special
family = getOption('repr.plot.family'),
...) {
if (!is_cairo_installed() && !capabilities('cairo')) return(NULL) #only cairo can do SVG
dev.cb <- function(tf)
if (is_cairo_installed())
Cairo::Cairo(width, height, tf, 'svg', pointsize, bg, 'transparent', 'in')
else
svg(tf, width, height, pointsize, FALSE, family, bg, antialias)
repr_recordedplot_generic(obj, '.svg', FALSE, dev.cb)
}
#' @name repr_*.recordedplot
#' @importFrom grDevices cairo_pdf pdf
#' @export
repr_pdf.recordedplot <- function(obj,
width = getOption('repr.plot.width'),
height = getOption('repr.plot.height'),
bg = getOption('repr.plot.bg'),
pointsize = getOption('repr.plot.pointsize'),
antialias = getOption('repr.plot.antialias'),
#special
family = getOption('repr.plot.family'),
...) repr_recordedplot_generic(obj, '.pdf', TRUE, function(tf) {
title <- plot_title(obj, 'Untitled plot')
if (capabilities('aqua')) # no import since R CMD check would complain
grDevices::quartz(title, width, height, pointsize, family, antialias, 'pdf', tf, bg)
else if (is_cairo_installed())
Cairo::Cairo(width, height, tf, 'pdf', pointsize, bg, 'transparent', 'in')
else if (capabilities('cairo'))
cairo_pdf(tf, width, height, pointsize, FALSE, family, bg, antialias)
else
pdf(tf, width, height, FALSE, family, title, bg = bg, pointsize = pointsize)
})
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