Mapbox Max/Min Zoom and bounds

[nicolaskruchten]

For many applications it would be good to be able to set bounds on where the user can pan and zoom mapbox maps: https://docs.mapbox.com/mapbox-gl-js/example/restrict-bounds/ and https://docs.mapbox.com/mapbox-gl-js/api/map/#map#setmaxzoom

[nicolaskruchten]

See also #3434 and the related cartesian #1876

[beautah]

I've come up with this as a python workaround, could be easily adaptable to js.

lats and longs are lists of all the coordinates.

`

zoom_lat = abs(abs(max(lats)) - abs(min(lats)))  

zoom_long = abs(abs(max(longs)) - abs(min(longs)))

zoom_factor = max([zoom_lat,zoom_long])

if zoom_factor < 0.002:

    zoom_factor = 0.002

auto_zoom = -1.35 * math.log(float(zoom_factor)) + 7

`

I should mention this has only been tested for regional (USA) coordinates, I could see it needing modification when crossing hemispheres/equator

[jacksongoode]

@archmoj I'm not sure if the bounds provide the same effect min/max zoom. Mapbox mention that there are some performance benefits by setting min/max zoom levels https://docs.mapbox.com/help/troubleshooting/mapbox-gl-js-performance/#filter-by-zoom-levels.