annotator provides functions to create image annotations through polygon outlining. Annotator has the same function as graphics::locator() but achieves its purpose through drawing, rather than multiple mouse clicks.
annotator is based on fabric.js, a Javascript HTML5 canvas library and htmlwidgets, a package that provides a framework for creating R bindings to JavaScript libraries.
The main function of the package is annotate(path_to_image). Polygons can be outlined on the image and polygon's coordinates are returned after each draw.
annotator makes it easy to create annotation pipelines in shiny. A minimal Shiny app demonstrating a simple pipeline can be found on shinyapps.io.
Stable version from CRAN:
install.packages("annotator")
Developement version from GITHUB:
# remotes::install_github("valcu/annotator")
install.packages("annotator", repos = c('https://valcu.r-universe.dev', 'https://cloud.r-project.org'))