94 lines
2.3 KiB
JavaScript
94 lines
2.3 KiB
JavaScript
goog.provide('ol.interaction.DragZoom');
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goog.require('goog.asserts');
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goog.require('ol.animation');
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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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goog.require('ol.style.Stroke');
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goog.require('ol.style.Style');
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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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* @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 ? options.duration : 200;
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/**
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* @private
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* @type {ol.style.Style}
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*/
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var style = options.style ?
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options.style : new ol.style.Style({
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stroke: new ol.style.Stroke({
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color: [0, 0, 255, 1]
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})
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});
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goog.base(this, {
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condition: condition,
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style: style
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});
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};
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goog.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 = map.getView();
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goog.asserts.assert(!goog.isNull(view), 'view should not be null');
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var size = map.getSize();
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goog.asserts.assert(size !== undefined, 'size should be defined');
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var extent = this.getGeometry().getExtent();
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var resolution = view.constrainResolution(
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view.getResolutionForExtent(extent, size));
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var currentResolution = view.getResolution();
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goog.asserts.assert(currentResolution !== undefined, 'res should be defined');
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var currentCenter = view.getCenter();
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goog.asserts.assert(currentCenter !== undefined, 'center should be defined');
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map.beforeRender(ol.animation.zoom({
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resolution: currentResolution,
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duration: this.duration_,
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easing: ol.easing.easeOut
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}));
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map.beforeRender(ol.animation.pan({
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source: currentCenter,
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duration: this.duration_,
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easing: ol.easing.easeOut
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}));
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view.setCenter(ol.extent.getCenter(extent));
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view.setResolution(resolution);
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};
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