Philip Mansfield from SchemaSoft is demoing a stunningly good “swell” magnifier - which allows contextual magnification - the normal magnifying glass hides context, demos on UK tubemap, you can see which line is connected/adjacent too when you have a magnifying glass.
Phil’s solution is an SVG/Vector magnifying glass solution, where there’s a transition phase between the zoomed and the original. Tough to describe, but excellent to view.
Interior region is a transformation, nice and simple, the transition region is an feDisplacementMap filter, and pixels from an input SVG image used to spatially displace another image. Phil explains the algorithm, hopefully the slides will be available later, as I’m not live noting them…
Demo is unfortunately not publically available, and we’d need to talk to about licensing… which is a shame, but not unexpected and it’s great!