iiif-layout-functions
Iiif-layout-functions takes a set of IIIF Presentation Canvases and calculates a number of useful layouts for displaying them in a normalised coordinate system. Layouts are contingent upon parameters such as the viewing-hint, viewing-direction, and other UX considerations. The normalised x,y, width, and height coordinates can be consumed by any rendering context, providing separation of concerns for representing IIIF canvases to the end user. There are no events, DOM elements, or other runtime APIs foisted on the user for interacting with canvases. A list of canvases goes in, and raw numbers come out.
Getting Started
To run the example locally, clone this repository and run
npm install
webpack
webpack-dev-server --content-base example/
Then visit localhost:8080 in the browser, and you should see some useful examples of how these layouts can be rendered in a variety of contexts.
Multiple Renderings
This library is agnostic to any rendering environment, but is intended to provide the hard math required to drive multiple renderings, of the developer's own design, simultaneously. Here are some conceptual guidelines for some of the most likely rendering solutions.
OpenSeadragon
The coordinates provided by this library are normalised to the "home" dimensions of a viewport element. The dimensions of the viewport are passed in as integers, and then used as a base for all the derivative layouts. For OpenSeadragon this means that these layout values for x, y, width, and height of canvases are intended to equate to "world coordinates" (as opposed to viewport, window, or image coordinates).