leaflet - Fit map to bounds exactly

Question

Is there a way to fit the map exactly to bounds? (or as close a possible).

For example, in this jsfiddle, even without padding the map leaves a lot of padding above and below the points:

http://jsfiddle.net/BC7q4/444/

map.fitBounds(bounds);

$('#fit1').click(function(){ map.fitBounds(bounds); });
$('#fit2').click(function(){ map.fitBounds(bounds, {padding: [50, 50]}); });

I'm trying to fit a map as precisely as possible to a set of bounds that closely match the map shape without all the extra padding.

Setting a map's ne corner and sw corner would work as well, but I don't think that functionality exists.

Answer 1

You are very probably looking for the map zoomSnap option:

Forces the map's zoom level to always be a multiple of this, particularly right after a fitBounds() or a pinch-zoom. By default, the zoom level snaps to the nearest integer; lower values (e.g. 0.5 or 0.1) allow for greater granularity. A value of 0 means the zoom level will not be snapped after fitBounds or a pinch-zoom.

Because its default value is 1, after your fitBounds the map will floor down the zoom value to the closest available integer value, hence possibly introducing more padding around your bounds.

By specifiying zoomSnap: 0, you ask the map not to snap the zoom value:

var map = L.map('map', {
  zoomSnap: 0 // http://leafletjs.com/reference.html#map-zoomsnap
}).setView([51.505, -0.09], 5);

// add an OpenStreetMap tile layer
L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
  attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
}).addTo(map);

var southWest = new L.LatLng(40.712, -74.227),
  northEast = new L.LatLng(40.774, -74.125),
  bounds = new L.LatLngBounds(southWest, northEast);

L.marker([40.712, -74.227]).addTo(map);
L.marker([40.774, -74.125]).addTo(map);

map.fitBounds(bounds);

$('#fit1').click(function() {
  map.fitBounds(bounds);
});
$('#fit2').click(function() {
  map.fitBounds(bounds, {
    padding: [50, 50]
  });
});

body {
  padding: 0;
  margin: 0;
}

#map {
  height: 300px;
  margin-top: 10px;
}

<link rel="stylesheet" href="https://unpkg.com/leaflet@1.2.0/dist/leaflet.css">
<script src="https://unpkg.com/leaflet@1.2.0/dist/leaflet-src.js"></script>
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>

<button id="fit1">fit without bounds</button>
<button id="fit2">fit with bounds</button>
<div id="map"></div>