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vector tiles wip
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3 files changed

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‎examples/clients/leaflet/geojson-dynamic-layer.js‎ renamed to ‎examples/clients/leaflet/geojson-layer.js‎

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@@ -1,7 +1,7 @@
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/* global L */
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(function() {
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L.GeoJSONURL = L.GeoJSON.extend({
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L.GeoJSONLayer = L.GeoJSON.extend({
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includes: L.Evented.prototype,
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@@ -74,8 +74,8 @@
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});
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L.geoJSONURL = function (options) {
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return new L.GeoJSONURL(options);
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L.geoJSONLayer = function (options) {
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return new L.GeoJSONLayer(options);
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};
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}).call(this);

‎examples/clients/leaflet/vanilla.html‎

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@@ -10,7 +10,8 @@
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<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css"/>
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<script src="https://unpkg.com/[email protected]/dist/leaflet.js"></script>
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<script src="geojson-dynamic-layer.js"></script>
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<script src="geojson-layer.js"></script>
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<!--<script src="vector-tile-layer.js"></script>-->
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</head>
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<body>
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@@ -22,9 +23,13 @@
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maxZoom: 18,
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}).addTo(mymap);
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L.geoJSONURL({
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L.geoJSONLayer({
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url: "http://localhost:8000/api.php/geojson/countries/1,2?bbox={bbox}",
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}).addTo(mymap);
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// L.vectorTileLayer('http://localhost:8000/api.php/geojson/countries/1,2?tile={z},{y},{x}', {
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// maxZoom: 18,
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// }).addTo(mymap);
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</script>
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</body>

‎examples/clients/leaflet/vector-tile-layer.js‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,114 @@
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/* global L */
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(function() {
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L.vectorTileLayer = L.GeoJSON.extend({
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includes: L.Evented.prototype,
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map: null,
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options: {
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},
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initialize(extraOptions, options) {
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L.GeoJSON.prototype.initialize.call(this, [], options);
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L.Util.setOptions(this, extraOptions);
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},
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/*
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function long2tile(lon,zoom) { return (Math.floor((lon+180)/360*Math.pow(2,zoom))); }
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function lat2tile(lat,zoom) { return (Math.floor((1-Math.log(Math.tan(lat*Math.PI/180) + 1/Math.cos(lat*Math.PI/180))/Math.PI)/2 *Math.pow(2,zoom))); }
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Inverse process:
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function tile2long(x,z) {
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return (x/Math.pow(2,z)*360-180);
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}
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function tile2lat(y,z) {
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var n=Math.PI-2*Math.PI*y/Math.pow(2,z);
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return (180/Math.PI*Math.atan(0.5*(Math.exp(n)-Math.exp(-n))));
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}
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Example for calculating number of tiles within given extent and zoom-level:
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var zoom = 9;
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var top_tile = lat2tile(north_edge, zoom); // eg.lat2tile(34.422, 9);
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var left_tile = lon2tile(west_edge, zoom);
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var bottom_tile = lat2tile(south_edge, zoom);
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var right_tile = lon2tile(east_edge, zoom);
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var width = Math.abs(left_tile - right_tile) + 1;
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var height = Math.abs(top_tile - bottom_tile) + 1;
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// total tiles
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var total_tiles = width * height; // -> eg. 377
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*/
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_reload: function() {
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if (this.map) {
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var urls = this._expand(this.options.url);
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for (var i=0; i<urls.length; i++) {
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this._ajax('GET', urls[i], false, this._update.bind(this));
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}
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}
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},
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_update: function(geoData) {
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this.clearLayers();
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this.addData(geoData);
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},
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onAdd: function(map) {
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L.GeoJSON.prototype.onAdd.call(this, map);
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this.map = map;
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map.on('moveend zoomend refresh', this._reload, this);
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this._reload();
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},
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onRemove: function(map) {
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map.off('moveend zoomend refresh', this._reload, this);
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this.map = null;
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L.GeoJSON.prototype.onRemove.call(this, map);
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},
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_expand: function(template) {
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var bbox = this._map.getBounds();
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var southWest = bbox.getSouthWest();
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var northEast = bbox.getNorthEast();
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var bboxStr = bbox.toBBoxString();
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var coords = {
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lat1: southWest.lat,
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lon1: southWest.lng,
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lat2: northEast.lat,
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lon2: northEast.lng,
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bbox: bboxStr
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};
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return [L.Util.template(template, coords)];
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},
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_ajax: function(method, url, data, callback) {
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var request = new XMLHttpRequest();
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request.open(method, url, true);
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request.onreadystatechange = function() {
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if (request.readyState === 4 && request.status === 200) {
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callback(JSON.parse(request.responseText));
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}
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};
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if (data) {
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request.setRequestHeader('Content-type', 'application/json');
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request.send(JSON.stringify(data));
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} else {
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request.send();
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}
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return request;
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},
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});
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L.vectorTileLayer = function (options) {
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return new L.vectorTileLayer(options);
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};
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}).call(this);

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