This is a very simple fork of the PDF.js viewer that adds the page coordinates, in point units, of the current mouse position at the bottom-left of the viewport.
It assumes the pages being viewed have US Letter dimensions.
The only changes to the original viewer are in
web/viewer.html, which adds links to the following
new files:
web/bookmarklet.css, which contains styling for the overlay.web/bookmarklet.js, which contains the overlay functionality. Don't modify this file directly, as it is automatically generated from TypeScript source; instead, see the instructions below.
To modify the overlay functionality, install yarn and start the file watcher:
yarn
yarn watch
You'll also want to start a web server that serves static files.
For instance, if you have Python 3, this can be done via
python3 -m http.server.
Then edit bookmarklet.ts. To view your
changes, reload web/viewer.html in your browser.
You can also run yarn build to rebuild the JS manually.