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support tiles in GeoJSON

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Maurits van der Schee 2019-07-06 22:03:41 +02:00
commit 431c3d618b
1 changed files with 0 additions and 40 deletions
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40
examples/clients/leaflet/geojson-tile-layer.js
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@ -58,46 +58,9 @@
// Custom methods
//
_expandUrl: function(template, coords) {
// from: https://wiki.openstreetmap.org/wiki/Slippy_map_tilenames#Implementations
var tile2lon = function(x,z) {
return (x/Math.pow(2,z)*360-180);
};
var tile2lat = function(y,z) {
var n=Math.PI-2*Math.PI*y/Math.pow(2,z);
return (180/Math.PI*Math.atan(0.5*(Math.exp(n)-Math.exp(-n))));
};
// from: https://leafletjs.com/reference-1.5.0.html#map-methods-for-getting-map-state
var southWest = L.latLng(
tile2lat(coords.y+1, coords.z),
tile2lon(coords.x+1, coords.z)
);
var northEast = L.latLng(
tile2lat(coords.y, coords.z),
tile2lon(coords.x, coords.z)
);
// from: "toBBoxString()" on https://leafletjs.com/reference-1.5.0.html#latlngbounds
var bboxStr = [southWest.lng,southWest.lat,northEast.lng,northEast.lat].join(',');
coords = Object.assign(coords, {
lat1: southWest.lat,
lon1: southWest.lng,
lat2: northEast.lat,
lon2: northEast.lng,
bbox: bboxStr
});
return L.Util.template(template, coords);
},
_hashCode: function(str) {
var hash = 0, i, chr;
if (str.length === 0) return hash;
for (i = 0; i < str.length; i++) {
chr = str.charCodeAt(i);
hash = ((hash << 5) - hash) + chr;
hash |= 0; // Convert to 32bit integer
}
return hash;
},
_updateTiles: function() {
this.layer.clearLayers();
this.features = {};
@ -114,9 +77,6 @@
geoData = geoData.features;
}
for (var i=0;i<geoData.length;i++) {
if (!geoData[i].id) {
geoData[i].id = this._hashCode(JSON.stringify(geoData[i].geometry));
}
var id = geoData[i].id;
if (!this.features[id]) {
this.layer.addData(geoData[i]);