110 lines
2.3 KiB
JavaScript
110 lines
2.3 KiB
JavaScript
goog.require('ol');
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goog.require('ol.Map');
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goog.require('ol.RendererHints');
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goog.require('ol.View2D');
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goog.require('ol.control.Control');
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goog.require('ol.control.defaults');
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goog.require('ol.layer.TileLayer');
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goog.require('ol.source.OSM');
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/**
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* Define a namespace for the application.
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*/
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window.app = {};
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var app = window.app;
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//
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// Define zoom extent control.
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//
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/**
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* @constructor
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* @extends {ol.control.Control}
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* @param {Object=} opt_options Control options.
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*/
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app.ZoomExtentControl = function(opt_options) {
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var options = opt_options || {};
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this.extent_ = options.extent;
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var anchor = document.createElement('a');
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anchor.href = '#zoom-to';
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anchor.className = 'zoom-to';
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var this_ = this;
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var handleZoomTo = function(e) {
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this_.handleZoomTo(e);
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};
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anchor.addEventListener('click', handleZoomTo, false);
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anchor.addEventListener('touchstart', handleZoomTo, false);
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var element = document.createElement('div');
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element.className = 'zoom-extent ol-unselectable';
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element.appendChild(anchor);
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ol.control.Control.call(this, {
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element: element,
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map: options.map,
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target: options.target
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});
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};
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ol.inherits(app.ZoomExtentControl, ol.control.Control);
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/**
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* @param {Event} e Browser event.
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*/
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app.ZoomExtentControl.prototype.handleZoomTo = function(e) {
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// prevent #zoomTo anchor from getting appended to the url
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e.preventDefault();
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var map = this.getMap();
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var view = map.getView();
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view.fitExtent(this.extent_, map.getSize());
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};
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/**
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* Overload setMap to use the view projection's validity extent
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* if no extent was passed to the constructor.
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* @param {ol.Map} map Map.
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*/
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app.ZoomExtentControl.prototype.setMap = function(map) {
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ol.control.Control.prototype.setMap.call(this, map);
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if (map && !this.extent_) {
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this.extent_ = map.getView().getProjection().getExtent();
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}
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};
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//
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// Create map, giving it a zoom extent control.
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//
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var map = new ol.Map({
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controls: ol.control.defaults({}, [
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new app.ZoomExtentControl({
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extent: [813079.7791264898, 848966.9639063801,
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5929220.284081122, 5936863.986909639]
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})
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]),
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layers: [
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new ol.layer.TileLayer({
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source: new ol.source.OSM()
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})
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],
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renderers: ol.RendererHints.createFromQueryData(),
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target: 'map',
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view: new ol.View2D({
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center: [0, 0],
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zoom: 2
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})
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});
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