ability to set max and min width, height

[snario]

As the title says. Essentially my goal is to create rectangles that are limited on size in sq. km for example no rectangle greater than 900 sq. km.

However in this case limiting the zoom level and then also limiting this to say 500px would work great

[heyman]

I agree, that would be really nice. Unfortunately, I don't think I'll have the time to implement any time soon. I'd be happy to accept pull requests though.

[snario]

I can have a look if I have some time in the coming weeks

On Mon, May 5, 2014 at 4:44 PM, Jonatan Heyman [email protected]:

I agree, that would be really nice. Unfortunately, I don't think I'll have
the time to implement any time soon. I'd be happy to accept pull requests
though.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/4#issuecomment-42237016
.

[heyman]

That'd be great!

On Mon, May 5, 2014 at 10:45 PM, Liam Horne [email protected]:

I can have a look if I have some time in the coming weeks

On Mon, May 5, 2014 at 4:44 PM, Jonatan Heyman [email protected]:

I agree, that would be really nice. Unfortunately, I don't think I'll
have
the time to implement any time soon. I'd be happy to accept pull
requests
though.

—
Reply to this email directly or view it on GitHub<
https://github.com/heyman/leaflet-areaselect/issues/4#issuecomment-42237016>

.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/4#issuecomment-42237147
.

[jase88]

Sounds great any updates on this?

[snario]

I haven't tackled this sorry, I was using this for a bit on a project I'm working on but switched to Leaflet Draw for my particular need and so just haven't needed to extend this functionality.

[jase88]

Okay thanks anyway for your quick reply.

So basically there are two events that have to be considered when limiting the size of an area:

1. Changing zoom level
2. Changing the selected area itself (mouse)

Next step: How to handle this?
Ok when you're dragging an area that would be too big, dragging should be stopped at maximum.
But zooming? I guess it would be the best to set the size of the area to the maximum on this zoom instead of preventing the whole zoom interaction.

It would be great to limit the size in square degrees because OpenStreetMap is limiting requests to their API with fixed area sizes in square degrees (e.g. Notes API 25 square degrees). Normally you would do that with (sin(maxlat)-sin(minlat)) * (maxlon-minlon). But the OSM backend simplifies this by removing the trigonometric functions, so it's just (maxlat-minlat)*(maxlon-minlon). Like this:

areaSelect.on("change", function() {
var bbox=this.getBounds();
var area = (bbox._northEast.lat-bbox._southWest.lat)*(bbox._northEast.lng-bbox._southWest.lng);
if(area<25)
  Session.set("bounds", this.getBounds());
else
  delete Session.keys['bounds'];
});