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import {Control} from './Control';
import * as DomUtil from '../dom/DomUtil';
/*
* @class Control.Scale
* @aka L.Control.Scale
* @inherits Control
*
* A simple scale control that shows the scale of the current center of screen in metric (m/km) and imperial (mi/ft) systems. Extends `Control`.
*
* @example
*
* ```js
* L.control.scale().addTo(map);
* ```
*/
export var Scale = Control.extend({
// @section
// @aka Control.Scale options
options: {
position: 'bottomleft',
// @option maxWidth: Number = 100
// Maximum width of the control in pixels. The width is set dynamically to show round values (e.g. 100, 200, 500).
maxWidth: 100,
// @option metric: Boolean = True
// Whether to show the metric scale line (m/km).
metric: true,
// @option imperial: Boolean = True
// Whether to show the imperial scale line (mi/ft).
imperial: true
// @option updateWhenIdle: Boolean = false
// If `true`, the control is updated on [`moveend`](#map-moveend), otherwise it's always up-to-date (updated on [`move`](#map-move)).
},
onAdd: function (map) {
var className = 'leaflet-control-scale',
container = DomUtil.create('div', className),
options = this.options;
this._addScales(options, className + '-line', 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) {
if (options.metric) {
this._mScale = DomUtil.create('div', className, container);
}
if (options.imperial) {
this._iScale = DomUtil.create('div', className, container);
}
},
_update: function () {
var map = this._map,
y = map.getSize().y / 2;
var maxMeters = map.distance(
map.containerPointToLatLng([0, y]),
map.containerPointToLatLng([this.options.maxWidth, y]));
this._updateScales(maxMeters);
},
_updateScales: function (maxMeters) {
if (this.options.metric && maxMeters) {
this._updateMetric(maxMeters);
}
if (this.options.imperial && maxMeters) {
this._updateImperial(maxMeters);
}
},
_updateMetric: function (maxMeters) {
var meters = this._getRoundNum(maxMeters),
label = meters < 1000 ? meters + ' m' : (meters / 1000) + ' km';
this._updateScale(this._mScale, label, meters / maxMeters);
},
_updateImperial: function (maxMeters) {
var maxFeet = maxMeters * 3.2808399,
maxMiles, miles, feet;
if (maxFeet > 5280) {
maxMiles = maxFeet / 5280;
miles = this._getRoundNum(maxMiles);
this._updateScale(this._iScale, miles + ' mi', miles / maxMiles);
} else {
feet = this._getRoundNum(maxFeet);
this._updateScale(this._iScale, feet + ' ft', feet / maxFeet);
}
},
_updateScale: function (scale, text, ratio) {
scale.style.width = Math.round(this.options.maxWidth * ratio) + 'px';
scale.innerHTML = text;
},
_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;
}
});
// @factory L.control.scale(options?: Control.Scale options)
// Creates an scale control with the given options.
export var scale = function (options) {
return new Scale(options);
};
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