gifski: Gifski

Description Usage Arguments Examples

View source: R/gifski.R

Description

Gifski converts image frames to high quality GIF animations. Either provide input png files, or automatically render animated graphics from the R graphics device.

Usage

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gifski(png_files, gif_file = "animation.gif", width = 800, height = 600,
  delay = 1, loop = TRUE, progress = TRUE)

save_gif(expr, gif_file = "animation.gif", width = 800, height = 600,
  delay = 1, loop = TRUE, progress = TRUE, ...)

Arguments

png_files

vector of png files

gif_file

output gif file

width

gif width in pixels

height

gif height in pixel

delay

time to show each image in seconds

loop

should the gif play forever (FALSE to only play once)

progress

show progress bar

expr

an R expression that creates graphics

...

other graphical parameters passed to png

Examples

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# Manually convert png files to gif
png_path <- file.path(tempdir(), "frame%03d.png")
png(png_path)
par(ask = FALSE)
for(i in 1:10)
  plot(rnorm(i * 10), main = i)
dev.off()
png_files <- sprintf(png_path, 1:10)
gif_file <- tempfile(fileext = ".gif")
gifski(png_files, gif_file)
unlink(png_files)
utils::browseURL(gif_file)


# Example borrowed from gganimate
library(gapminder)
library(ggplot2)
makeplot <- function(){
  datalist <- split(gapminder, gapminder$year)
  lapply(datalist, function(data){
    p <- ggplot(data, aes(gdpPercap, lifeExp, size = pop, color = continent)) +
      scale_size("population", limits = range(gapminder$pop)) + geom_point() + ylim(20, 90) +
      scale_x_log10(limits = range(gapminder$gdpPercap)) + ggtitle(data$year) + theme_classic()
    print(p)
  })
}

# High Definition images:
gif_file <- file.path(tempdir(), 'gapminder.gif')
save_gif(makeplot(), gif_file, 1280, 720, res = 144)
utils::browseURL(gif_file)

gifski documentation built on May 1, 2019, 11:33 p.m.