Panning and zooming needs improvement

[tomayac]

Better on desktop, but still not feels 100% natural. It's worse on mobile.

[tomayac]

https://github.com/tomayac/SVGcode/blob/main/src/js/panzoom.js

[argyleink]

I had some odd snapping happening, where i'd hover and it'd snap to a different zoom level. trying to find sequential repro steps.

[dwelle]

The biggest problem I see is that panning doesn't account for zoom. On high zoom, slight panning moves the canvas too much. When zoomed out, panning barely moves the canvas.

Another bug: once you pan, you can zoom in/out beyond the limit. Repro: 1) zoom out to 0.1 2) pan canvas a bit 3) you are allowed to zoom out again 4) repeat ad infinitum.

[Fuzzyma]

Maybe it helps to see how https://github.com/svgdotjs/svg.panzoom.js does it. I am the Maintainer and afaik it works pretty good

[tomayac]

I have now moved to pinch-zoom, which introduced a drifting bug on pinch-zooming, tracked in #46. It's definitely still better than what we had before. Hoping for an eventual fix here.