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import * as Util from '../core/Util';
import {Evented} from '../core/Events';
import * as DomUtil from '../dom/DomUtil';
/*
* @class PosAnimation
* @aka L.PosAnimation
* @inherits Evented
* Used internally for panning animations, utilizing CSS3 Transitions for modern browsers and a timer fallback for IE6-9.
*
* @example
* ```js
* var myPositionMarker = L.marker([48.864716, 2.294694]).addTo(map);
*
* myPositionMarker.on("click", function() {
* var pos = map.latLngToLayerPoint(myPositionMarker.getLatLng());
* pos.y -= 25;
* var fx = new L.PosAnimation();
*
* fx.once('end',function() {
* pos.y += 25;
* fx.run(myPositionMarker._icon, pos, 0.8);
* });
*
* fx.run(myPositionMarker._icon, pos, 0.3);
* });
*
* ```
*
* @constructor L.PosAnimation()
* Creates a `PosAnimation` object.
*
*/
export var PosAnimation = Evented.extend({
// @method run(el: HTMLElement, newPos: Point, duration?: Number, easeLinearity?: Number)
// Run an animation of a given element to a new position, optionally setting
// duration in seconds (`0.25` by default) and easing linearity factor (3rd
// argument of the [cubic bezier curve](https://cubic-bezier.com/#0,0,.5,1),
// `0.5` by default).
run: function (el, newPos, duration, easeLinearity) {
this.stop();
this._el = el;
this._inProgress = true;
this._duration = duration || 0.25;
this._easeOutPower = 1 / Math.max(easeLinearity || 0.5, 0.2);
this._startPos = DomUtil.getPosition(el);
this._offset = newPos.subtract(this._startPos);
this._startTime = +new Date();
// @event start: Event
// Fired when the animation starts
this.fire('start');
this._animate();
},
// @method stop()
// Stops the animation (if currently running).
stop: function () {
if (!this._inProgress) { return; }
this._step(true);
this._complete();
},
_animate: function () {
// animation loop
this._animId = Util.requestAnimFrame(this._animate, this);
this._step();
},
_step: function (round) {
var elapsed = (+new Date()) - this._startTime,
duration = this._duration * 1000;
if (elapsed < duration) {
this._runFrame(this._easeOut(elapsed / duration), round);
} else {
this._runFrame(1);
this._complete();
}
},
_runFrame: function (progress, round) {
var pos = this._startPos.add(this._offset.multiplyBy(progress));
if (round) {
pos._round();
}
DomUtil.setPosition(this._el, pos);
// @event step: Event
// Fired continuously during the animation.
this.fire('step');
},
_complete: function () {
Util.cancelAnimFrame(this._animId);
this._inProgress = false;
// @event end: Event
// Fired when the animation ends.
this.fire('end');
},
_easeOut: function (t) {
return 1 - Math.pow(1 - t, this._easeOutPower);
}
});
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