Build a tile-source descriptor for the canvas — at_tile_source • annotatR

Build a tile-source descriptor for the canvas

Usage

at_tile_source(
  img,
  level_max = NULL,
  tile_size = 512L,
  embed = TRUE,
  call = rlang::caller_env()
)

Arguments

img: An annot_image.
level_max: Optional maximum level to expose; the image maximum by default.
tile_size: Tile size in pixels. Default 512.
embed: Logical; embed a downsampled base image as a data URI (for the self-contained canvas). Default TRUE.
call: The calling environment, for error reporting.

Value

A list describing the image for the widget: width, height, tileSize, minLevel, maxLevel, nBands, and (when embed) dataUri.

See also

Other shiny: atCanvasOutput(), at_annotate(), at_canvas(), at_canvas_fit(), at_canvas_proxy(), at_canvas_set_annotations(), at_canvas_set_band(), at_canvas_set_overlay(), at_canvas_set_tool(), renderAtCanvas()