84 lines
1.9 KiB
JavaScript
84 lines
1.9 KiB
JavaScript
goog.require('ol.Map');
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goog.require('ol.View');
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goog.require('ol.layer.Tile');
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goog.require('ol.proj');
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goog.require('ol.source.TileJSON');
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goog.require('ol.interaction.Draw');
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goog.require('ol.interaction.DragRotateAndZoom');
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function transform(extent) {
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return ol.proj.transformExtent(extent, 'EPSG:4326', 'EPSG:3857');
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}
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var extents = {
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northwest: transform([-180, 0, 0, 85]),
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northeast: transform([0, 0, 180, 85]),
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southeast: transform([0, -85, 180, 0]),
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southwest: transform([-180, -85, 0, 0]),
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world: transform([-180, -85, 180, 85])
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};
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var base = new ol.layer.Tile({
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source: new ol.source.TileJSON({
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url: 'http://api.tiles.mapbox.com/v3/' +
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'mapbox.world-black.json',
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crossOrigin: 'anonymous'
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})
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});
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var overlay = new ol.layer.Tile({
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extent: extents.northwest,
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source: new ol.source.TileJSON({
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url: 'http://api.tiles.mapbox.com/v3/' +
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'mapbox.world-glass.json',
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crossOrigin: 'anonymous'
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})
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});
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var map = new ol.Map({
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layers: [base, overlay],
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renderer: common.getRendererFromQueryString(),
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target: 'map',
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view: new ol.View({
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center: [0, 0],
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zoom: 1
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})
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});
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function box(coordinates, geometry) {
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if (!geometry) {
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geometry = new ol.geom.Polygon(null);
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}
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var start = coordinates[0];
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var end = coordinates[1];
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geometry.setCoordinates([
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[start, [start[0], end[1]], end, [end[0], start[1]], start]
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]);
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return geometry;
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}
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var draw = new ol.interaction.Draw({
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type: /** @type {ol.geom.GeometryType} */ ('LineString'),
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geometryFunction: box,
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maxPoints: 2
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});
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draw.on('drawend', function(ev) {
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var extent = ev.feature.getGeometry().getExtent();
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overlay.setExtent(extent);
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});
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map.addInteraction(new ol.interaction.DragRotateAndZoom());
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document.getElementById('draw').onclick = function() {
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map.addInteraction(draw);
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};
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for (var key in extents) {
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document.getElementById(key).onclick = function(event) {
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overlay.setExtent(extents[event.target.id]);
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};
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}
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