/
Map.js
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/
Map.js
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import * as Util from '../core/Util';
import {Evented} from '../core/Events';
import {EPSG3857} from '../geo/crs/CRS.EPSG3857';
import {Point, toPoint} from '../geometry/Point';
import {Bounds, toBounds} from '../geometry/Bounds';
import {LatLng, toLatLng} from '../geo/LatLng';
import {LatLngBounds, toLatLngBounds} from '../geo/LatLngBounds';
import * as Browser from '../core/Browser';
import * as DomEvent from '../dom/DomEvent';
import * as DomUtil from '../dom/DomUtil';
import {PosAnimation} from '../dom/PosAnimation';
/*
* @class Map
* @aka L.Map
* @inherits Evented
*
* The central class of the API — it is used to create a map on a page and manipulate it.
*
* @example
*
* ```js
* // initialize the map on the "map" div with a given center and zoom
* var map = L.map('map', {
* center: [51.505, -0.09],
* zoom: 13
* });
* ```
*
*/
export var Map = Evented.extend({
options: {
// @section Map State Options
// @option crs: CRS = L.CRS.EPSG3857
// The [Coordinate Reference System](#crs) to use. Don't change this if you're not
// sure what it means.
crs: EPSG3857,
// @option center: LatLng = undefined
// Initial geographic center of the map
center: undefined,
// @option zoom: Number = undefined
// Initial map zoom level
zoom: undefined,
// @option minZoom: Number = *
// Minimum zoom level of the map.
// If not specified and at least one `GridLayer` or `TileLayer` is in the map,
// the lowest of their `minZoom` options will be used instead.
minZoom: undefined,
// @option maxZoom: Number = *
// Maximum zoom level of the map.
// If not specified and at least one `GridLayer` or `TileLayer` is in the map,
// the highest of their `maxZoom` options will be used instead.
maxZoom: undefined,
// @option layers: Layer[] = []
// Array of layers that will be added to the map initially
layers: [],
// @option maxBounds: LatLngBounds = null
// When this option is set, the map restricts the view to the given
// geographical bounds, bouncing the user back if the user tries to pan
// outside the view. To set the restriction dynamically, use
// [`setMaxBounds`](#map-setmaxbounds) method.
maxBounds: undefined,
// @option renderer: Renderer = *
// The default method for drawing vector layers on the map. `L.SVG`
// or `L.Canvas` by default depending on browser support.
renderer: undefined,
// @section Animation Options
// @option zoomAnimation: Boolean = true
// Whether the map zoom animation is enabled. By default it's enabled
// in all browsers that support CSS3 Transitions except Android.
zoomAnimation: true,
// @option zoomAnimationThreshold: Number = 4
// Won't animate zoom if the zoom difference exceeds this value.
zoomAnimationThreshold: 4,
// @option fadeAnimation: Boolean = true
// Whether the tile fade animation is enabled. By default it's enabled
// in all browsers that support CSS3 Transitions except Android.
fadeAnimation: true,
// @option markerZoomAnimation: Boolean = true
// Whether markers animate their zoom with the zoom animation, if disabled
// they will disappear for the length of the animation. By default it's
// enabled in all browsers that support CSS3 Transitions except Android.
markerZoomAnimation: true,
// @option transform3DLimit: Number = 2^23
// Defines the maximum size of a CSS translation transform. The default
// value should not be changed unless a web browser positions layers in
// the wrong place after doing a large `panBy`.
transform3DLimit: 8388608, // Precision limit of a 32-bit float
// @section Interaction Options
// @option zoomSnap: Number = 1
// Forces the map's zoom level to always be a multiple of this, particularly
// right after a [`fitBounds()`](#map-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.
zoomSnap: 1,
// @option zoomDelta: Number = 1
// Controls how much the map's zoom level will change after a
// [`zoomIn()`](#map-zoomin), [`zoomOut()`](#map-zoomout), pressing `+`
// or `-` on the keyboard, or using the [zoom controls](#control-zoom).
// Values smaller than `1` (e.g. `0.5`) allow for greater granularity.
zoomDelta: 1,
// @option trackResize: Boolean = true
// Whether the map automatically handles browser window resize to update itself.
trackResize: true
},
initialize: function (id, options) { // (HTMLElement or String, Object)
options = Util.setOptions(this, options);
this._initContainer(id);
this._initLayout();
// hack for https://github.com/Leaflet/Leaflet/issues/1980
this._onResize = Util.bind(this._onResize, this);
this._initEvents();
if (options.maxBounds) {
this.setMaxBounds(options.maxBounds);
}
if (options.zoom !== undefined) {
this._zoom = this._limitZoom(options.zoom);
}
if (options.center && options.zoom !== undefined) {
this.setView(toLatLng(options.center), options.zoom, {reset: true});
}
this._handlers = [];
this._layers = {};
this._zoomBoundLayers = {};
this._sizeChanged = true;
this.callInitHooks();
// don't animate on browsers without hardware-accelerated transitions or old Android/Opera
this._zoomAnimated = DomUtil.TRANSITION && Browser.any3d && !Browser.mobileOpera &&
this.options.zoomAnimation;
// zoom transitions run with the same duration for all layers, so if one of transitionend events
// happens after starting zoom animation (propagating to the map pane), we know that it ended globally
if (this._zoomAnimated) {
this._createAnimProxy();
DomEvent.on(this._proxy, DomUtil.TRANSITION_END, this._catchTransitionEnd, this);
}
this._addLayers(this.options.layers);
},
// @section Methods for modifying map state
// @method setView(center: LatLng, zoom: Number, options?: Zoom/pan options): this
// Sets the view of the map (geographical center and zoom) with the given
// animation options.
setView: function (center, zoom, options) {
zoom = zoom === undefined ? this._zoom : this._limitZoom(zoom);
center = this._limitCenter(toLatLng(center), zoom, this.options.maxBounds);
options = options || {};
this._stop();
if (this._loaded && !options.reset && options !== true) {
if (options.animate !== undefined) {
options.zoom = Util.extend({animate: options.animate}, options.zoom);
options.pan = Util.extend({animate: options.animate, duration: options.duration}, options.pan);
}
// try animating pan or zoom
var moved = (this._zoom !== zoom) ?
this._tryAnimatedZoom && this._tryAnimatedZoom(center, zoom, options.zoom) :
this._tryAnimatedPan(center, options.pan);
if (moved) {
// prevent resize handler call, the view will refresh after animation anyway
clearTimeout(this._sizeTimer);
return this;
}
}
// animation didn't start, just reset the map view
this._resetView(center, zoom);
return this;
},
// @method setZoom(zoom: Number, options?: Zoom/pan options): this
// Sets the zoom of the map.
setZoom: function (zoom, options) {
if (!this._loaded) {
this._zoom = zoom;
return this;
}
return this.setView(this.getCenter(), zoom, {zoom: options});
},
// @method zoomIn(delta?: Number, options?: Zoom options): this
// Increases the zoom of the map by `delta` ([`zoomDelta`](#map-zoomdelta) by default).
zoomIn: function (delta, options) {
delta = delta || (Browser.any3d ? this.options.zoomDelta : 1);
return this.setZoom(this._zoom + delta, options);
},
// @method zoomOut(delta?: Number, options?: Zoom options): this
// Decreases the zoom of the map by `delta` ([`zoomDelta`](#map-zoomdelta) by default).
zoomOut: function (delta, options) {
delta = delta || (Browser.any3d ? this.options.zoomDelta : 1);
return this.setZoom(this._zoom - delta, options);
},
// @method setZoomAround(latlng: LatLng, zoom: Number, options: Zoom options): this
// Zooms the map while keeping a specified geographical point on the map
// stationary (e.g. used internally for scroll zoom and double-click zoom).
// @alternative
// @method setZoomAround(offset: Point, zoom: Number, options: Zoom options): this
// Zooms the map while keeping a specified pixel on the map (relative to the top-left corner) stationary.
setZoomAround: function (latlng, zoom, options) {
var scale = this.getZoomScale(zoom),
viewHalf = this.getSize().divideBy(2),
containerPoint = latlng instanceof Point ? latlng : this.latLngToContainerPoint(latlng),
centerOffset = containerPoint.subtract(viewHalf).multiplyBy(1 - 1 / scale),
newCenter = this.containerPointToLatLng(viewHalf.add(centerOffset));
return this.setView(newCenter, zoom, {zoom: options});
},
_getBoundsCenterZoom: function (bounds, options) {
options = options || {};
bounds = bounds.getBounds ? bounds.getBounds() : toLatLngBounds(bounds);
var paddingTL = toPoint(options.paddingTopLeft || options.padding || [0, 0]),
paddingBR = toPoint(options.paddingBottomRight || options.padding || [0, 0]),
zoom = this.getBoundsZoom(bounds, false, paddingTL.add(paddingBR));
zoom = (typeof options.maxZoom === 'number') ? Math.min(options.maxZoom, zoom) : zoom;
if (zoom === Infinity) {
return {
center: bounds.getCenter(),
zoom: zoom
};
}
var paddingOffset = paddingBR.subtract(paddingTL).divideBy(2),
swPoint = this.project(bounds.getSouthWest(), zoom),
nePoint = this.project(bounds.getNorthEast(), zoom),
center = this.unproject(swPoint.add(nePoint).divideBy(2).add(paddingOffset), zoom);
return {
center: center,
zoom: zoom
};
},
// @method fitBounds(bounds: LatLngBounds, options?: fitBounds options): this
// Sets a map view that contains the given geographical bounds with the
// maximum zoom level possible.
fitBounds: function (bounds, options) {
bounds = toLatLngBounds(bounds);
if (!bounds.isValid()) {
throw new Error('Bounds are not valid.');
}
var target = this._getBoundsCenterZoom(bounds, options);
return this.setView(target.center, target.zoom, options);
},
// @method fitWorld(options?: fitBounds options): this
// Sets a map view that mostly contains the whole world with the maximum
// zoom level possible.
fitWorld: function (options) {
return this.fitBounds([[-90, -180], [90, 180]], options);
},
// @method panTo(latlng: LatLng, options?: Pan options): this
// Pans the map to a given center.
panTo: function (center, options) { // (LatLng)
return this.setView(center, this._zoom, {pan: options});
},
// @method panBy(offset: Point, options?: Pan options): this
// Pans the map by a given number of pixels (animated).
panBy: function (offset, options) {
offset = toPoint(offset).round();
options = options || {};
if (!offset.x && !offset.y) {
return this.fire('moveend');
}
// If we pan too far, Chrome gets issues with tiles
// and makes them disappear or appear in the wrong place (slightly offset) #2602
if (options.animate !== true && !this.getSize().contains(offset)) {
this._resetView(this.unproject(this.project(this.getCenter()).add(offset)), this.getZoom());
return this;
}
if (!this._panAnim) {
this._panAnim = new PosAnimation();
this._panAnim.on({
'step': this._onPanTransitionStep,
'end': this._onPanTransitionEnd
}, this);
}
// don't fire movestart if animating inertia
if (!options.noMoveStart) {
this.fire('movestart');
}
// animate pan unless animate: false specified
if (options.animate !== false) {
DomUtil.addClass(this._mapPane, 'leaflet-pan-anim');
var newPos = this._getMapPanePos().subtract(offset).round();
this._panAnim.run(this._mapPane, newPos, options.duration || 0.25, options.easeLinearity);
} else {
this._rawPanBy(offset);
this.fire('move').fire('moveend');
}
return this;
},
// @method flyTo(latlng: LatLng, zoom?: Number, options?: Zoom/pan options): this
// Sets the view of the map (geographical center and zoom) performing a smooth
// pan-zoom animation.
flyTo: function (targetCenter, targetZoom, options) {
options = options || {};
if (options.animate === false || !Browser.any3d) {
return this.setView(targetCenter, targetZoom, options);
}
this._stop();
var from = this.project(this.getCenter()),
to = this.project(targetCenter),
size = this.getSize(),
startZoom = this._zoom;
targetCenter = toLatLng(targetCenter);
targetZoom = targetZoom === undefined ? startZoom : targetZoom;
var w0 = Math.max(size.x, size.y),
w1 = w0 * this.getZoomScale(startZoom, targetZoom),
u1 = (to.distanceTo(from)) || 1,
rho = 1.42,
rho2 = rho * rho;
function r(i) {
var s1 = i ? -1 : 1,
s2 = i ? w1 : w0,
t1 = w1 * w1 - w0 * w0 + s1 * rho2 * rho2 * u1 * u1,
b1 = 2 * s2 * rho2 * u1,
b = t1 / b1,
sq = Math.sqrt(b * b + 1) - b;
// workaround for floating point precision bug when sq = 0, log = -Infinite,
// thus triggering an infinite loop in flyTo
var log = sq < 0.000000001 ? -18 : Math.log(sq);
return log;
}
function sinh(n) { return (Math.exp(n) - Math.exp(-n)) / 2; }
function cosh(n) { return (Math.exp(n) + Math.exp(-n)) / 2; }
function tanh(n) { return sinh(n) / cosh(n); }
var r0 = r(0);
function w(s) { return w0 * (cosh(r0) / cosh(r0 + rho * s)); }
function u(s) { return w0 * (cosh(r0) * tanh(r0 + rho * s) - sinh(r0)) / rho2; }
function easeOut(t) { return 1 - Math.pow(1 - t, 1.5); }
var start = Date.now(),
S = (r(1) - r0) / rho,
duration = options.duration ? 1000 * options.duration : 1000 * S * 0.8;
function frame() {
var t = (Date.now() - start) / duration,
s = easeOut(t) * S;
if (t <= 1) {
this._flyToFrame = Util.requestAnimFrame(frame, this);
this._move(
this.unproject(from.add(to.subtract(from).multiplyBy(u(s) / u1)), startZoom),
this.getScaleZoom(w0 / w(s), startZoom),
{flyTo: true});
} else {
this
._move(targetCenter, targetZoom)
._moveEnd(true);
}
}
this._moveStart(true, options.noMoveStart);
frame.call(this);
return this;
},
// @method flyToBounds(bounds: LatLngBounds, options?: fitBounds options): this
// Sets the view of the map with a smooth animation like [`flyTo`](#map-flyto),
// but takes a bounds parameter like [`fitBounds`](#map-fitbounds).
flyToBounds: function (bounds, options) {
var target = this._getBoundsCenterZoom(bounds, options);
return this.flyTo(target.center, target.zoom, options);
},
// @method setMaxBounds(bounds: Bounds): this
// Restricts the map view to the given bounds (see the [maxBounds](#map-maxbounds) option).
setMaxBounds: function (bounds) {
bounds = toLatLngBounds(bounds);
if (!bounds.isValid()) {
this.options.maxBounds = null;
return this.off('moveend', this._panInsideMaxBounds);
} else if (this.options.maxBounds) {
this.off('moveend', this._panInsideMaxBounds);
}
this.options.maxBounds = bounds;
if (this._loaded) {
this._panInsideMaxBounds();
}
return this.on('moveend', this._panInsideMaxBounds);
},
// @method setMinZoom(zoom: Number): this
// Sets the lower limit for the available zoom levels (see the [minZoom](#map-minzoom) option).
setMinZoom: function (zoom) {
var oldZoom = this.options.minZoom;
this.options.minZoom = zoom;
if (this._loaded && oldZoom !== zoom) {
this.fire('zoomlevelschange');
if (this.getZoom() < this.options.minZoom) {
return this.setZoom(zoom);
}
}
return this;
},
// @method setMaxZoom(zoom: Number): this
// Sets the upper limit for the available zoom levels (see the [maxZoom](#map-maxzoom) option).
setMaxZoom: function (zoom) {
var oldZoom = this.options.maxZoom;
this.options.maxZoom = zoom;
if (this._loaded && oldZoom !== zoom) {
this.fire('zoomlevelschange');
if (this.getZoom() > this.options.maxZoom) {
return this.setZoom(zoom);
}
}
return this;
},
// @method panInsideBounds(bounds: LatLngBounds, options?: Pan options): this
// Pans the map to the closest view that would lie inside the given bounds (if it's not already), controlling the animation using the options specific, if any.
panInsideBounds: function (bounds, options) {
this._enforcingBounds = true;
var center = this.getCenter(),
newCenter = this._limitCenter(center, this._zoom, toLatLngBounds(bounds));
if (!center.equals(newCenter)) {
this.panTo(newCenter, options);
}
this._enforcingBounds = false;
return this;
},
// @method invalidateSize(options: Zoom/pan options): this
// Checks if the map container size changed and updates the map if so —
// call it after you've changed the map size dynamically, also animating
// pan by default. If `options.pan` is `false`, panning will not occur.
// If `options.debounceMoveend` is `true`, it will delay `moveend` event so
// that it doesn't happen often even if the method is called many
// times in a row.
// @alternative
// @method invalidateSize(animate: Boolean): this
// Checks if the map container size changed and updates the map if so —
// call it after you've changed the map size dynamically, also animating
// pan by default.
invalidateSize: function (options) {
if (!this._loaded) { return this; }
options = Util.extend({
animate: false,
pan: true
}, options === true ? {animate: true} : options);
var oldSize = this.getSize();
this._sizeChanged = true;
this._lastCenter = null;
var newSize = this.getSize(),
oldCenter = oldSize.divideBy(2).round(),
newCenter = newSize.divideBy(2).round(),
offset = oldCenter.subtract(newCenter);
if (!offset.x && !offset.y) { return this; }
if (options.animate && options.pan) {
this.panBy(offset);
} else {
if (options.pan) {
this._rawPanBy(offset);
}
this.fire('move');
if (options.debounceMoveend) {
clearTimeout(this._sizeTimer);
this._sizeTimer = setTimeout(Util.bind(this.fire, this, 'moveend'), 200);
} else {
this.fire('moveend');
}
}
// @section Map state change events
// @event resize: ResizeEvent
// Fired when the map is resized.
return this.fire('resize', {
oldSize: oldSize,
newSize: newSize
});
},
// @section Methods for modifying map state
// @method stop(): this
// Stops the currently running `panTo` or `flyTo` animation, if any.
stop: function () {
this.setZoom(this._limitZoom(this._zoom));
if (!this.options.zoomSnap) {
this.fire('viewreset');
}
return this._stop();
},
// @section Geolocation methods
// @method locate(options?: Locate options): this
// Tries to locate the user using the Geolocation API, firing a [`locationfound`](#map-locationfound)
// event with location data on success or a [`locationerror`](#map-locationerror) event on failure,
// and optionally sets the map view to the user's location with respect to
// detection accuracy (or to the world view if geolocation failed).
// Note that, if your page doesn't use HTTPS, this method will fail in
// modern browsers ([Chrome 50 and newer](https://sites.google.com/a/chromium.org/dev/Home/chromium-security/deprecating-powerful-features-on-insecure-origins))
// See `Locate options` for more details.
locate: function (options) {
options = this._locateOptions = Util.extend({
timeout: 10000,
watch: false
// setView: false
// maxZoom: <Number>
// maximumAge: 0
// enableHighAccuracy: false
}, options);
if (!('geolocation' in navigator)) {
this._handleGeolocationError({
code: 0,
message: 'Geolocation not supported.'
});
return this;
}
var onResponse = Util.bind(this._handleGeolocationResponse, this),
onError = Util.bind(this._handleGeolocationError, this);
if (options.watch) {
this._locationWatchId =
navigator.geolocation.watchPosition(onResponse, onError, options);
} else {
navigator.geolocation.getCurrentPosition(onResponse, onError, options);
}
return this;
},
// @method stopLocate(): this
// Stops watching location previously initiated by `map.locate({watch: true})`
// and aborts resetting the map view if map.locate was called with
// `{setView: true}`.
stopLocate: function () {
if (navigator.geolocation && navigator.geolocation.clearWatch) {
navigator.geolocation.clearWatch(this._locationWatchId);
}
if (this._locateOptions) {
this._locateOptions.setView = false;
}
return this;
},
_handleGeolocationError: function (error) {
var c = error.code,
message = error.message ||
(c === 1 ? 'permission denied' :
(c === 2 ? 'position unavailable' : 'timeout'));
if (this._locateOptions.setView && !this._loaded) {
this.fitWorld();
}
// @section Location events
// @event locationerror: ErrorEvent
// Fired when geolocation (using the [`locate`](#map-locate) method) failed.
this.fire('locationerror', {
code: c,
message: 'Geolocation error: ' + message + '.'
});
},
_handleGeolocationResponse: function (pos) {
var lat = pos.coords.latitude,
lng = pos.coords.longitude,
latlng = new LatLng(lat, lng),
bounds = latlng.toBounds(pos.coords.accuracy),
options = this._locateOptions;
if (options.setView) {
var zoom = this.getBoundsZoom(bounds);
this.setView(latlng, options.maxZoom ? Math.min(zoom, options.maxZoom) : zoom);
}
var data = {
latlng: latlng,
bounds: bounds,
timestamp: pos.timestamp
};
for (var i in pos.coords) {
if (typeof pos.coords[i] === 'number') {
data[i] = pos.coords[i];
}
}
// @event locationfound: LocationEvent
// Fired when geolocation (using the [`locate`](#map-locate) method)
// went successfully.
this.fire('locationfound', data);
},
// TODO Appropriate docs section?
// @section Other Methods
// @method addHandler(name: String, HandlerClass: Function): this
// Adds a new `Handler` to the map, given its name and constructor function.
addHandler: function (name, HandlerClass) {
if (!HandlerClass) { return this; }
var handler = this[name] = new HandlerClass(this);
this._handlers.push(handler);
if (this.options[name]) {
handler.enable();
}
return this;
},
// @method remove(): this
// Destroys the map and clears all related event listeners.
remove: function () {
this._initEvents(true);
if (this._containerId !== this._container._leaflet_id) {
throw new Error('Map container is being reused by another instance');
}
try {
// throws error in IE6-8
delete this._container._leaflet_id;
delete this._containerId;
} catch (e) {
/*eslint-disable */
this._container._leaflet_id = undefined;
/* eslint-enable */
this._containerId = undefined;
}
if (this._locationWatchId !== undefined) {
this.stopLocate();
}
this._stop();
DomUtil.remove(this._mapPane);
if (this._clearControlPos) {
this._clearControlPos();
}
this._clearHandlers();
if (this._loaded) {
// @section Map state change events
// @event unload: Event
// Fired when the map is destroyed with [remove](#map-remove) method.
this.fire('unload');
}
var i;
for (i in this._layers) {
this._layers[i].remove();
}
for (i in this._panes) {
DomUtil.remove(this._panes[i]);
}
this._layers = [];
this._panes = [];
delete this._mapPane;
delete this._renderer;
return this;
},
// @section Other Methods
// @method createPane(name: String, container?: HTMLElement): HTMLElement
// Creates a new [map pane](#map-pane) with the given name if it doesn't exist already,
// then returns it. The pane is created as a child of `container`, or
// as a child of the main map pane if not set.
createPane: function (name, container) {
var className = 'leaflet-pane' + (name ? ' leaflet-' + name.replace('Pane', '') + '-pane' : ''),
pane = DomUtil.create('div', className, container || this._mapPane);
if (name) {
this._panes[name] = pane;
}
return pane;
},
// @section Methods for Getting Map State
// @method getCenter(): LatLng
// Returns the geographical center of the map view
getCenter: function () {
this._checkIfLoaded();
if (this._lastCenter && !this._moved()) {
return this._lastCenter;
}
return this.layerPointToLatLng(this._getCenterLayerPoint());
},
// @method getZoom(): Number
// Returns the current zoom level of the map view
getZoom: function () {
return this._zoom;
},
// @method getBounds(): LatLngBounds
// Returns the geographical bounds visible in the current map view
getBounds: function () {
var bounds = this.getPixelBounds(),
sw = this.unproject(bounds.getBottomLeft()),
ne = this.unproject(bounds.getTopRight());
return new LatLngBounds(sw, ne);
},
// @method getMinZoom(): Number
// Returns the minimum zoom level of the map (if set in the `minZoom` option of the map or of any layers), or `0` by default.
getMinZoom: function () {
return this.options.minZoom === undefined ? this._layersMinZoom || 0 : this.options.minZoom;
},
// @method getMaxZoom(): Number
// Returns the maximum zoom level of the map (if set in the `maxZoom` option of the map or of any layers).
getMaxZoom: function () {
return this.options.maxZoom === undefined ?
(this._layersMaxZoom === undefined ? Infinity : this._layersMaxZoom) :
this.options.maxZoom;
},
// @method getBoundsZoom(bounds: LatLngBounds, inside?: Boolean): Number
// Returns the maximum zoom level on which the given bounds fit to the map
// view in its entirety. If `inside` (optional) is set to `true`, the method
// instead returns the minimum zoom level on which the map view fits into
// the given bounds in its entirety.
getBoundsZoom: function (bounds, inside, padding) { // (LatLngBounds[, Boolean, Point]) -> Number
bounds = toLatLngBounds(bounds);
padding = toPoint(padding || [0, 0]);
var zoom = this.getZoom() || 0,
min = this.getMinZoom(),
max = this.getMaxZoom(),
nw = bounds.getNorthWest(),
se = bounds.getSouthEast(),
size = this.getSize().subtract(padding),
boundsSize = toBounds(this.project(se, zoom), this.project(nw, zoom)).getSize(),
snap = Browser.any3d ? this.options.zoomSnap : 1,
scalex = size.x / boundsSize.x,
scaley = size.y / boundsSize.y,
scale = inside ? Math.max(scalex, scaley) : Math.min(scalex, scaley);
zoom = this.getScaleZoom(scale, zoom);
if (snap) {
zoom = Math.round(zoom / (snap / 100)) * (snap / 100); // don't jump if within 1% of a snap level
zoom = inside ? Math.ceil(zoom / snap) * snap : Math.floor(zoom / snap) * snap;
}
return Math.max(min, Math.min(max, zoom));
},
// @method getSize(): Point
// Returns the current size of the map container (in pixels).
getSize: function () {
if (!this._size || this._sizeChanged) {
this._size = new Point(
this._container.clientWidth || 0,
this._container.clientHeight || 0);
this._sizeChanged = false;
}
return this._size.clone();
},
// @method getPixelBounds(): Bounds
// Returns the bounds of the current map view in projected pixel
// coordinates (sometimes useful in layer and overlay implementations).
getPixelBounds: function (center, zoom) {
var topLeftPoint = this._getTopLeftPoint(center, zoom);
return new Bounds(topLeftPoint, topLeftPoint.add(this.getSize()));
},
// TODO: Check semantics - isn't the pixel origin the 0,0 coord relative to
// the map pane? "left point of the map layer" can be confusing, specially
// since there can be negative offsets.
// @method getPixelOrigin(): Point
// Returns the projected pixel coordinates of the top left point of
// the map layer (useful in custom layer and overlay implementations).
getPixelOrigin: function () {
this._checkIfLoaded();
return this._pixelOrigin;
},
// @method getPixelWorldBounds(zoom?: Number): Bounds
// Returns the world's bounds in pixel coordinates for zoom level `zoom`.
// If `zoom` is omitted, the map's current zoom level is used.
getPixelWorldBounds: function (zoom) {
return this.options.crs.getProjectedBounds(zoom === undefined ? this.getZoom() : zoom);
},
// @section Other Methods
// @method getPane(pane: String|HTMLElement): HTMLElement
// Returns a [map pane](#map-pane), given its name or its HTML element (its identity).
getPane: function (pane) {
return typeof pane === 'string' ? this._panes[pane] : pane;
},
// @method getPanes(): Object
// Returns a plain object containing the names of all [panes](#map-pane) as keys and
// the panes as values.
getPanes: function () {
return this._panes;
},
// @method getContainer: HTMLElement
// Returns the HTML element that contains the map.
getContainer: function () {
return this._container;
},
// @section Conversion Methods
// @method getZoomScale(toZoom: Number, fromZoom: Number): Number
// Returns the scale factor to be applied to a map transition from zoom level
// `fromZoom` to `toZoom`. Used internally to help with zoom animations.
getZoomScale: function (toZoom, fromZoom) {
// TODO replace with universal implementation after refactoring projections
var crs = this.options.crs;
fromZoom = fromZoom === undefined ? this._zoom : fromZoom;
return crs.scale(toZoom) / crs.scale(fromZoom);
},
// @method getScaleZoom(scale: Number, fromZoom: Number): Number
// Returns the zoom level that the map would end up at, if it is at `fromZoom`
// level and everything is scaled by a factor of `scale`. Inverse of
// [`getZoomScale`](#map-getZoomScale).
getScaleZoom: function (scale, fromZoom) {
var crs = this.options.crs;
fromZoom = fromZoom === undefined ? this._zoom : fromZoom;
var zoom = crs.zoom(scale * crs.scale(fromZoom));
return isNaN(zoom) ? Infinity : zoom;
},
// @method project(latlng: LatLng, zoom: Number): Point
// Projects a geographical coordinate `LatLng` according to the projection
// of the map's CRS, then scales it according to `zoom` and the CRS's
// `Transformation`. The result is pixel coordinate relative to
// the CRS origin.
project: function (latlng, zoom) {
zoom = zoom === undefined ? this._zoom : zoom;
return this.options.crs.latLngToPoint(toLatLng(latlng), zoom);
},
// @method unproject(point: Point, zoom: Number): LatLng
// Inverse of [`project`](#map-project).
unproject: function (point, zoom) {
zoom = zoom === undefined ? this._zoom : zoom;
return this.options.crs.pointToLatLng(toPoint(point), zoom);
},
// @method layerPointToLatLng(point: Point): LatLng
// Given a pixel coordinate relative to the [origin pixel](#map-getpixelorigin),
// returns the corresponding geographical coordinate (for the current zoom level).
layerPointToLatLng: function (point) {
var projectedPoint = toPoint(point).add(this.getPixelOrigin());
return this.unproject(projectedPoint);
},
// @method latLngToLayerPoint(latlng: LatLng): Point
// Given a geographical coordinate, returns the corresponding pixel coordinate
// relative to the [origin pixel](#map-getpixelorigin).
latLngToLayerPoint: function (latlng) {
var projectedPoint = this.project(toLatLng(latlng))._round();
return projectedPoint._subtract(this.getPixelOrigin());
},
// @method wrapLatLng(latlng: LatLng): LatLng
// Returns a `LatLng` where `lat` and `lng` has been wrapped according to the
// map's CRS's `wrapLat` and `wrapLng` properties, if they are outside the
// CRS's bounds.
// By default this means longitude is wrapped around the dateline so its
// value is between -180 and +180 degrees.
wrapLatLng: function (latlng) {
return this.options.crs.wrapLatLng(toLatLng(latlng));
},
// @method wrapLatLngBounds(bounds: LatLngBounds): LatLngBounds
// Returns a `LatLngBounds` with the same size as the given one, ensuring that
// its center is within the CRS's bounds.
// By default this means the center longitude is wrapped around the dateline so its
// value is between -180 and +180 degrees, and the majority of the bounds
// overlaps the CRS's bounds.
wrapLatLngBounds: function (latlng) {
return this.options.crs.wrapLatLngBounds(toLatLngBounds(latlng));
},
// @method distance(latlng1: LatLng, latlng2: LatLng): Number
// Returns the distance between two geographical coordinates according to
// the map's CRS. By default this measures distance in meters.
distance: function (latlng1, latlng2) {
return this.options.crs.distance(toLatLng(latlng1), toLatLng(latlng2));
},
// @method containerPointToLayerPoint(point: Point): Point
// Given a pixel coordinate relative to the map container, returns the corresponding
// pixel coordinate relative to the [origin pixel](#map-getpixelorigin).
containerPointToLayerPoint: function (point) { // (Point)
return toPoint(point).subtract(this._getMapPanePos());
},