89 lines
2.3 KiB
JavaScript
89 lines
2.3 KiB
JavaScript
/**
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* @module ol/interaction/DragZoom
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*/
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import {inherits} from '../index.js';
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import {easeOut} from '../easing.js';
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import {shiftKeyOnly} from '../events/condition.js';
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import {createOrUpdateFromCoordinates, getBottomLeft, getCenter, getTopRight, scaleFromCenter} from '../extent.js';
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import DragBox from '../interaction/DragBox.js';
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/**
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* @classdesc
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* Allows the user to zoom the map by clicking and dragging on the map,
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* normally combined with an {@link ol.events.condition} that limits
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* it to when a key, shift by default, is held down.
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*
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* To change the style of the box, use CSS and the `.ol-dragzoom` selector, or
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* your custom one configured with `className`.
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*
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* @constructor
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* @extends {ol.interaction.DragBox}
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* @param {olx.interaction.DragZoomOptions=} opt_options Options.
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* @api
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*/
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const DragZoom = function(opt_options) {
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const options = opt_options ? opt_options : {};
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const condition = options.condition ? options.condition : shiftKeyOnly;
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/**
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* @private
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* @type {number}
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*/
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this.duration_ = options.duration !== undefined ? options.duration : 200;
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/**
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* @private
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* @type {boolean}
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*/
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this.out_ = options.out !== undefined ? options.out : false;
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DragBox.call(this, {
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condition: condition,
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className: options.className || 'ol-dragzoom'
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});
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};
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inherits(DragZoom, DragBox);
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/**
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* @inheritDoc
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*/
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DragZoom.prototype.onBoxEnd = function() {
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const map = this.getMap();
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const view = /** @type {!ol.View} */ (map.getView());
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const size = /** @type {!ol.Size} */ (map.getSize());
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let extent = this.getGeometry().getExtent();
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if (this.out_) {
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const mapExtent = view.calculateExtent(size);
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const boxPixelExtent = createOrUpdateFromCoordinates([
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map.getPixelFromCoordinate(getBottomLeft(extent)),
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map.getPixelFromCoordinate(getTopRight(extent))]);
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const factor = view.getResolutionForExtent(boxPixelExtent, size);
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scaleFromCenter(mapExtent, 1 / factor);
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extent = mapExtent;
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}
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const resolution = view.constrainResolution(
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view.getResolutionForExtent(extent, size));
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let center = getCenter(extent);
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center = view.constrainCenter(center);
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view.animate({
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resolution: resolution,
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center: center,
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duration: this.duration_,
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easing: easeOut
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});
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};
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export default DragZoom;
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