Render SVG into Bitmap

Render svg image into a high quality bitmap. When both width and height are NULL, the output resolution matches that of the input. When either width or height is specified, the image is scaled proportionally. When both width and height are specified, the image is stretched into the requested size.

Usage

rsvg(svg, width = NULL, height = NULL, css = NULL)

rsvg_raw(svg, width = NULL, height = NULL, css = NULL)

rsvg_nativeraster(svg, width = NULL, height = NULL, css = NULL)

rsvg_webp(svg, file = NULL, width = NULL, height = NULL, css = NULL)

rsvg_png(svg, file = NULL, width = NULL, height = NULL, css = NULL)

rsvg_pdf(svg, file = NULL, width = NULL, height = NULL, css = NULL)

rsvg_svg(svg, file = NULL, width = NULL, height = NULL, css = NULL)

rsvg_ps(svg, file = NULL, width = NULL, height = NULL, css = NULL)

rsvg_eps(svg, file = NULL, width = NULL, height = NULL, css = NULL)

Arguments

svg

path/url to svg file or raw vector with svg data. Use charToRaw to convert an SVG string into raw data.

width

output width in pixels or NULL for default.

height

output height in pixels or NULL for default

css

path/url to external css file or raw vector with css data. This requires your system has a recent version of librsvg.

file

path to output file or NULL to return content as raw vector

Examples

# create some svg
options(example.ask=FALSE)
tmp <- tempfile()
svglite::svglite(tmp, width = 10, height = 7)
ggplot2::qplot(mpg, wt, data = mtcars, colour = factor(cyl))
#> Warning: `qplot()` was deprecated in ggplot2 3.4.0.
dev.off()
#> agg_record_346871191 
#>                    2 

# convert directly into a vector or bitmap graphics format
rsvg_pdf(tmp, "out.pdf")
rsvg_png(tmp, "out.png")
rsvg_svg(tmp, "out.svg")
rsvg_ps(tmp, "out.ps")
rsvg_eps(tmp, "out.eps")

# render into raw bitmap array
bitmap <- rsvg(tmp, height = 1440)
dim(bitmap) # h*w*c
#> [1] 1440 2057    4

# render to native raster object
nr <- rsvg_nativeraster(tmp)
# grid::grid.raster(nr)

# read in your package of choice
magick::image_read(bitmap)
#> # A tibble: 1 × 7
#>   format width height colorspace matte filesize density
#>   <chr>  <int>  <int> <chr>      <lgl>    <int> <chr>  
#> 1 PNG     2057   1440 sRGB       TRUE         0 72x72  
webp::write_webp(bitmap, "bitmap.webp", quality = 100)

# cleanup
unlink(c("out.*", "bitmap.webp"))