text: 
  import {Bounds} from '../../geometry/Bounds';
  import {LatLng} from '../LatLng';
  import {LatLngBounds} from '../LatLngBounds';
  import * as Util from '../../core/Util';
  
  /*
   * @namespace CRS
   * @crs L.CRS.Base
   * Object that defines coordinate reference systems for projecting
   * geographical points into pixel (screen) coordinates and back (and to
   * coordinates in other units for [WMS](https://en.wikipedia.org/wiki/Web_Map_Service) services). See
   * [spatial reference system](https://en.wikipedia.org/wiki/Spatial_reference_system).
   *
   * Leaflet defines the most usual CRSs by default. If you want to use a
   * CRS not defined by default, take a look at the
   * [Proj4Leaflet](https://github.com/kartena/Proj4Leaflet) plugin.
   *
   * Note that the CRS instances do not inherit from Leaflet's `Class` object,
   * and can't be instantiated. Also, new classes can't inherit from them,
   * and methods can't be added to them with the `include` function.
   */
  
  export var CRS = {
  	// @method latLngToPoint(latlng: LatLng, zoom: Number): Point
  	// Projects geographical coordinates into pixel coordinates for a given zoom.
  	latLngToPoint: function (latlng, zoom) {
  		var projectedPoint = this.projection.project(latlng),
  		    scale = this.scale(zoom);
  
  		return this.transformation._transform(projectedPoint, scale);
  	},
  
  	// @method pointToLatLng(point: Point, zoom: Number): LatLng
  	// The inverse of `latLngToPoint`. Projects pixel coordinates on a given
  	// zoom into geographical coordinates.
  	pointToLatLng: function (point, zoom) {
  		var scale = this.scale(zoom),
  		    untransformedPoint = this.transformation.untransform(point, scale);
  
  		return this.projection.unproject(untransformedPoint);
  	},
  
  	// @method project(latlng: LatLng): Point
  	// Projects geographical coordinates into coordinates in units accepted for
  	// this CRS (e.g. meters for EPSG:3857, for passing it to WMS services).
  	project: function (latlng) {
  		return this.projection.project(latlng);
  	},
  
  	// @method unproject(point: Point): LatLng
  	// Given a projected coordinate returns the corresponding LatLng.
  	// The inverse of `project`.
  	unproject: function (point) {
  		return this.projection.unproject(point);
  	},
  
  	// @method scale(zoom: Number): Number
  	// Returns the scale used when transforming projected coordinates into
  	// pixel coordinates for a particular zoom. For example, it returns
  	// `256 * 2^zoom` for Mercator-based CRS.
  	scale: function (zoom) {
  		return 256 * Math.pow(2, zoom);
  	},
  
  	// @method zoom(scale: Number): Number
  	// Inverse of `scale()`, returns the zoom level corresponding to a scale
  	// factor of `scale`.
  	zoom: function (scale) {
  		return Math.log(scale / 256) / Math.LN2;
  	},
  
  	// @method getProjectedBounds(zoom: Number): Bounds
  	// Returns the projection's bounds scaled and transformed for the provided `zoom`.
  	getProjectedBounds: function (zoom) {
  		if (this.infinite) { return null; }
  
  		var b = this.projection.bounds,
  		    s = this.scale(zoom),
  		    min = this.transformation.transform(b.min, s),
  		    max = this.transformation.transform(b.max, s);
  
  		return new Bounds(min, max);
  	},
  
  	// @method distance(latlng1: LatLng, latlng2: LatLng): Number
  	// Returns the distance between two geographical coordinates.
  
  	// @property code: String
  	// Standard code name of the CRS passed into WMS services (e.g. `'EPSG:3857'`)
  	//
  	// @property wrapLng: Number[]
  	// An array of two numbers defining whether the longitude (horizontal) coordinate
  	// axis wraps around a given range and how. Defaults to `[-180, 180]` in most
  	// geographical CRSs. If `undefined`, the longitude axis does not wrap around.
  	//
  	// @property wrapLat: Number[]
  	// Like `wrapLng`, but for the latitude (vertical) axis.
  
  	// wrapLng: [min, max],
  	// wrapLat: [min, max],
  
  	// @property infinite: Boolean
  	// If true, the coordinate space will be unbounded (infinite in both axes)
  	infinite: false,
  
  	// @method wrapLatLng(latlng: LatLng): LatLng
  	// Returns a `LatLng` where lat and lng has been wrapped according to the
  	// CRS's `wrapLat` and `wrapLng` properties, if they are outside the CRS's bounds.
  	wrapLatLng: function (latlng) {
  		var lng = this.wrapLng ? Util.wrapNum(latlng.lng, this.wrapLng, true) : latlng.lng,
  		    lat = this.wrapLat ? Util.wrapNum(latlng.lat, this.wrapLat, true) : latlng.lat,
  		    alt = latlng.alt;
  
  		return new LatLng(lat, lng, alt);
  	},
  
  	// @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.
  	// Only accepts actual `L.LatLngBounds` instances, not arrays.
  	wrapLatLngBounds: function (bounds) {
  		var center = bounds.getCenter(),
  		    newCenter = this.wrapLatLng(center),
  		    latShift = center.lat - newCenter.lat,
  		    lngShift = center.lng - newCenter.lng;
  
  		if (latShift === 0 && lngShift === 0) {
  			return bounds;
  		}
  
  		var sw = bounds.getSouthWest(),
  		    ne = bounds.getNorthEast(),
  		    newSw = new LatLng(sw.lat - latShift, sw.lng - lngShift),
  		    newNe = new LatLng(ne.lat - latShift, ne.lng - lngShift);
  
  		return new LatLngBounds(newSw, newNe);
  	}
  };
  