85 lines
2.2 KiB
JavaScript
85 lines
2.2 KiB
JavaScript
goog.provide('ol.interaction.DragZoom');
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goog.require('ol');
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goog.require('ol.easing');
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goog.require('ol.events.condition');
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goog.require('ol.extent');
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goog.require('ol.interaction.DragBox');
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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 stable
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*/
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ol.interaction.DragZoom = function(opt_options) {
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var options = opt_options ? opt_options : {};
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var condition = options.condition ?
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options.condition : ol.events.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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ol.interaction.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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ol.inherits(ol.interaction.DragZoom, ol.interaction.DragBox);
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/**
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* @inheritDoc
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*/
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ol.interaction.DragZoom.prototype.onBoxEnd = function() {
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var map = this.getMap();
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var view = /** @type {!ol.View} */ (map.getView());
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var size = /** @type {!ol.Size} */ (map.getSize());
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var extent = this.getGeometry().getExtent();
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if (this.out_) {
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var mapExtent = view.calculateExtent(size);
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var boxPixelExtent = ol.extent.createOrUpdateFromCoordinates([
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map.getPixelFromCoordinate(ol.extent.getBottomLeft(extent)),
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map.getPixelFromCoordinate(ol.extent.getTopRight(extent))]);
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var factor = view.getResolutionForExtent(boxPixelExtent, size);
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ol.extent.scaleFromCenter(mapExtent, 1 / factor);
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extent = mapExtent;
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}
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var resolution = view.constrainResolution(
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view.getResolutionForExtent(extent, size));
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view.animate({
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resolution: resolution,
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center: ol.extent.getCenter(extent),
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duration: this.duration_,
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easing: ol.easing.easeOut
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});
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};
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