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Earlier quoted context omitted.
https://seatgeek.com/senators-at-flyers-tickets/4-11-2015-ph...
Tiles are good and responsive, but you may want to add a shadow behind the text "Section N, Row M" because some arena pictures are largely white!
Bit off-topic, but do any of the readers of this topic know of a good combination of an open source (backend) tile server and a (frontend) JS zooming library for dealing with large high-resolution images, of say, something like old paintings?
I highly recommend this hybrid approach of 10-20 canvases plus a sprinkling of HTML elements for anybody looking to maximize responsiveness in this type of UI. In our tests, SVG and HTML start stuttering in draggable layers around tens of thousands of elements (easier to hit than you'd think). We actually decided to do mouseover calculations ourselves, in a pixel map within a mousemove handler, since having separate elements to trigger the mouseover was too expensive.
Bit off-topic, but do any of the readers of this topic know of a good combination of an open source (backend) tile server and a (frontend) JS zooming library for dealing with large high-resolution images, of say, something like old paintings?