Render PNG image(s) of slides. The function renders to the PDF and then converts it into PNG files of each slide. The slide numbers defined by the slides argument are saved (defaults to 1, returning only the title slide). If length(slides) > 1, it will return the PNG files in a ZIP file. You can also get a ZIP file of all the slides as PNGs by setting slides = "all").

## Usage

to_png(
from,
to = NULL,
density = 100,
slides = 1,
complex_slides = FALSE,
partial_slides = FALSE,
delay = 1,
keep_intermediates = FALSE
)

## Arguments

from

Path to an .Rmd, .qmd, .html, .pdf file, or a URL. If from is a URL to slides on a website, you must provide the full URL ending in ".html".

to

Name of the output .png or .zip file.

density

Resolution of the resulting PNGs in each slide file. Defaults to 100.

slides

A numeric or integer vector of the slide number(s) to render as PNG files , or one of "all", "first", or "last". Negative integers select which slides not to include. If more than one slide are included, PNGs will be returned as a ZIP file. Defaults to "all", in which case all slides are included.

complex_slides

For "complex" slides (e.g. slides with panelsets or other html widgets or advanced features), set complex_slides = TRUE. Defaults to FALSE. This will use the chromote package to iterate through the slides at a pace set by the delay argument. Requires a local installation of Chrome.

partial_slides

Should partial (continuation) slides be included in the output? If FALSE, the default, only the complete slide is included in the PDF.

delay

Seconds of delay between advancing to and printing a new slide. Only used if complex_slides = TRUE or partial_slides = TRUE.

keep_intermediates

Should we keep the intermediate files used to render the final output? The default is FALSE.

## Value

Slides are rendered as a .png file (single) or .zip file of multiple .png files.

## Examples

with_example("slides.Rmd", requires_chrome = TRUE, {
# By default a png of only the first slide is built
to_png("slides.Rmd", keep_intermediates = TRUE)

# or render a zip file of multiple or all slides (slides = "all")
to_png("slides.pdf", slides = c(1, 3, 5))
})
#> ℹ Rendering slides.Rmd into slides.html
#> ✔ Rendering slides.Rmd into slides.html ... done
#>
#> ℹ Rendering slides.html into slides.pdf
#> ✔ Rendering slides.html into slides.pdf ... done
#>
#> ℹ Rendering slides.pdf into slides.png
#> ✔ Rendering slides.pdf into slides.png ... done
#>
#> ℹ Rendering slides.pdf into slides.zip
#> ✔ Rendering slides.pdf into slides.zip ... done
#>