5:59:51rotateqjackdaniel: I like your McCLIM 'Checkers' example, I can learn from it how to build some interface with things that "engage" at a place which is nearest to the mouse pointer. :)
6:00:44rotateqThe frames which appear when I hover over a presentation object with the mouse, do they have to be rectangular?
6:29:13jackdanielnot necessarily, but you need to define your own presentation method for highlight-presentation
6:51:59rotateqah it's with highlight-presentation. so many exported symbols
7:48:19jackdanielwhere printf-based-debugging meets draw-design and #'signal: https://imgur.com/eGYifPe.png
7:49:36jackdanielboth polygons have the same coordiantes (drawing makes use of translation), marked points are sweep-bands split points. top polygon - coordinates are rationalized, bottom polygon - coordinates are left as is
7:50:02jackdanielprobably I should add a third one where they are coerced to float, because that also gives correct result