# Code coverage report for src/control/Control.Scale.js

## Statements: 31.58% (12 / 38) Branches: 10% (3 / 30) Functions: 20% (2 / 10) Lines: 31.58% (12 / 38)

All files » src/control/ » Control.Scale.js

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     /*
     * L.Control.Scale is used for displaying metric/imperial scale on the map.
     */

    L.Control.Scale = L.Control.extend({
    	options: {
    		position: 'bottomleft',
    		maxWidth: 100,
    		metric: true,
    		imperial: true,
    		updateWhenIdle: false
    	},

    	onAdd: function (map) {
    		this._map = map;

    		var className = 'leaflet-control-scale',
    		    container = L.DomUtil.create('div', className),
    		    options = this.options;

    		this._addScales(options, className, container);

    		map.on(options.updateWhenIdle ? 'moveend' : 'move', this._update, this);
    		map.whenReady(this._update, this);

    		return container;
    	},

    	onRemove: function (map) {
    		map.off(this.options.updateWhenIdle ? 'moveend' : 'move', this._update, this);
    	},

    	_addScales: function (options, className, container) {
    		Eif (options.metric) {
    			this._mScale = L.DomUtil.create('div', className + '-line', container);
    		}
    		Eif (options.imperial) {
    			this._iScale = L.DomUtil.create('div', className + '-line', container);
    		}
    	},

    	_update: function () {
    		var bounds = this._map.getBounds(),
    		    centerLat = bounds.getCenter().lat,
    		    halfWorldMeters = 6378137 * Math.PI * Math.cos(centerLat * Math.PI / 180),
    		    dist = halfWorldMeters * (bounds.getNorthEast().lng - bounds.getSouthWest().lng) / 180,

    		    size = this._map.getSize(),
    		    options = this.options,
    		    maxMeters = 0;

    		if (size.x > 0) {
    			maxMeters = dist * (options.maxWidth / size.x);
    		}

    		this._updateScales(options, maxMeters);
    	},

    	_updateScales: function (options, maxMeters) {
    		if (options.metric && maxMeters) {
    			this._updateMetric(maxMeters);
    		}

    		if (options.imperial && maxMeters) {
    			this._updateImperial(maxMeters);
    		}
    	},

    	_updateMetric: function (maxMeters) {
    		var meters = this._getRoundNum(maxMeters);

    		this._mScale.style.width = this._getScaleWidth(meters / maxMeters) + 'px';
    		this._mScale.innerHTML = meters < 1000 ? meters + ' m' : (meters / 1000) + ' km';
    	},

    	_updateImperial: function (maxMeters) {
    		var maxFeet = maxMeters * 3.2808399,
    		    scale = this._iScale,
    		    maxMiles, miles, feet;

    		if (maxFeet > 5280) {
    			maxMiles = maxFeet / 5280;
    			miles = this._getRoundNum(maxMiles);

    			scale.style.width = this._getScaleWidth(miles / maxMiles) + 'px';
    			scale.innerHTML = miles + ' mi';

    		} else {
    			feet = this._getRoundNum(maxFeet);

    			scale.style.width = this._getScaleWidth(feet / maxFeet) + 'px';
    			scale.innerHTML = feet + ' ft';
    		}
    	},

    	_getScaleWidth: function (ratio) {
    		return Math.round(this.options.maxWidth * ratio) - 10;
    	},

    	_getRoundNum: function (num) {
    		var pow10 = Math.pow(10, (Math.floor(num) + '').length - 1),
    		    d = num / pow10;

    		d = d >= 10 ? 10 : d >= 5 ? 5 : d >= 3 ? 3 : d >= 2 ? 2 : 1;

    		return pow10 * d;
    	}
    });

    L.control.scale = function (options) {
    	return new L.Control.Scale(options);
    };