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Cesium-Examples/examples/cesiumEx/mvt.js

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refactor: 求个star
2025-03-11 08:25:45 +00:00
(function (window) {
function createMVTWithStyle(options) {
function MVTProvider(options) {
options = Cesium.defaultValue(options, Cesium.defaultValue.EMPTY_OBJECT);
this._tilingScheme = Cesium.defined(options.tilingScheme) ? options.tilingScheme : new Cesium.WebMercatorTilingScheme({ ellipsoid: options.ellipsoid });
this._tileWidth = Cesium.defaultValue(options.tileWidth, 512);
this._tileHeight = Cesium.defaultValue(options.tileHeight, 512);
this._readyPromise = Cesium.when.resolve(true);
if (!window.ol) {
throw new DeveloperError('<27><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Openlayers<72><73>⣡');
}
this._ol = window.ol;
this._mvtParser = new this._ol.format.MVT();
this._styleFun = options.style;
this._key = Cesium.defaultValue(options.key, "");
this._url = Cesium.defaultValue(options.url, "https://a.tiles.mapbox.com/v4/mapbox.mapbox-streets-v6/{z}/{x}/{y}.vector.pbf?access_token={k}");
var sw = this._tilingScheme._rectangleSouthwestInMeters;
var ne = this._tilingScheme._rectangleNortheastInMeters;
var mapExtent = [sw.x, sw.y, ne.x, ne.y];
this._resolutions = ol.tilegrid.resolutionsFromExtent(
mapExtent, 22, this._tileWidth);
this._pixelRatio = 1;
this._transform = [0.125, 0, 0, 0.125, 0, 0];
this._replays = ["Default", "Image", "Polygon", "LineString", "Text"];
this._tileQueue = new Cesium.TileReplacementQueue();
this._cacheSize = 1000;
}
Object.defineProperties(MVTProvider.prototype, {
proxy: {
get: function () {
return undefined;
}
},
tileWidth: {
get: function () {
return this._tileWidth;
}
},
tileHeight: {
get: function () {
return this._tileHeight;
}
},
maximumLevel: {
get: function () {
return undefined;
}
},
minimumLevel: {
get: function () {
return undefined;
}
},
tilingScheme: {
get: function () {
return this._tilingScheme;
}
},
rectangle: {
get: function () {
return this._tilingScheme.rectangle;
}
},
tileDiscardPolicy: {
get: function () {
return undefined;
}
},
errorEvent: {
get: function () {
return this._errorEvent;
}
},
ready: {
get: function () {
return true;
}
},
readyPromise: {
get: function () {
return this._readyPromise;
}
},
credit: {
get: function () {
return undefined;
}
},
hasAlphaChannel: {
get: function () {
return true;
}
}
});
MVTProvider.prototype.getTileCredits = function (x, y, level) {
return undefined;
};
function findTileInQueue(x, y, level, tileQueue) {
var item = tileQueue.head;
while (item != undefined && !(item.xMvt == x && item.yMvt == y && item.zMvt == level)) {
item = item.replacementNext;
}
return item;
};
function remove(tileReplacementQueue, item) {
var previous = item.replacementPrevious;
var next = item.replacementNext;
if (item === tileReplacementQueue._lastBeforeStartOfFrame) {
tileReplacementQueue._lastBeforeStartOfFrame = next;
}
if (item === tileReplacementQueue.head) {
tileReplacementQueue.head = next;
} else {
previous.replacementNext = next;
}
if (item === tileReplacementQueue.tail) {
tileReplacementQueue.tail = previous;
} else {
next.replacementPrevious = previous;
}
item.replacementPrevious = undefined;
item.replacementNext = undefined;
--tileReplacementQueue.count;
}
function trimTiles(tileQueue, maximumTiles) {
var tileToTrim = tileQueue.tail;
while (tileQueue.count > maximumTiles &&
Cesium.defined(tileToTrim)) {
var previous = tileToTrim.replacementPrevious;
remove(tileQueue, tileToTrim);
delete tileToTrim;
tileToTrim = null;
tileToTrim = previous;
}
};
MVTProvider.prototype.requestImage = function (x, y, level, request) {
var cacheTile = findTileInQueue(x, y, level, this._tileQueue);
if (cacheTile != undefined) {
return cacheTile;
}
else {
var that = this;
var url = this._url;
url = url.replace('{x}', x).replace('{y}', y).replace('{z}', level).replace('{k}', this._key);
var tilerequest = function (x, y, z) {
var resource = Cesium.Resource.createIfNeeded(url);
return resource.fetchArrayBuffer().then(function (arrayBuffer) {
var canvas = document.createElement('canvas');
canvas.width = 512;
canvas.height = 512;
var vectorContext = canvas.getContext('2d');
var features = that._mvtParser.readFeatures(arrayBuffer);
var styleFun = that._styleFun();
var extent = [0, 0, 4096, 4096];
var _replayGroup = new ol.render.canvas.ReplayGroup(0, extent,
8, true, 100);
for (var i = 0; i < features.length; i++) {
var feature = features[i];
var styles = styleFun(features[i], that._resolutions[level]);
for (var j = 0; j < styles.length; j++) {
ol.renderer.vector.renderFeature_(_replayGroup, feature, styles[j], 16);
}
}
_replayGroup.finish();
_replayGroup.replay(vectorContext, that._pixelRatio, that._transform, 0, {}, that._replays, true);
if (that._tileQueue.count > that._cacheSize) {
trimTiles(that._tileQueue, that._cacheSize / 2);
}
canvas.xMvt = x;
canvas.yMvt = y;
canvas.zMvt = z;
that._tileQueue.markTileRendered(canvas);
delete _replayGroup;
_replayGroup = null;
return canvas;
}).otherwise(function (error) {
});
// return Cesium.loadArrayBuffer(url).then(function(arrayBuffer) {
// }).otherwise(function(error) {
// });
}(x, y, level);
}
};
MVTProvider.prototype.pickFeatures = function (x, y, level, longitude, latitude) {
return undefined;
};
return new MVTProvider(options);
}
// Styles for the mapbox-streets-v6 vector tile data set. Loosely based on
// http://a.tiles.mapbox.com/v4/mapbox.mapbox-streets-v6.json
function createMapboxStreetsV6Style() {
var fill = new ol.style.Fill({ color: '#ccc' });
var stroke = new ol.style.Stroke({ color: '#ccc', width: 1 });
var polygon = new ol.style.Style({ fill: fill });
var strokedPolygon = new ol.style.Style({ fill: fill, stroke: stroke });
var line = new ol.style.Style({ stroke: stroke });
var text = new ol.style.Style({
text: new ol.style.Text({
text: '', fill: fill, stroke: stroke
})
});
var iconCache = {};
function getIcon(iconName) {
var icon = iconCache[iconName];
if (!icon) {
icon = new ol.style.Style({
image: new ol.style.Icon({
src: 'https://cdn.rawgit.com/mapbox/maki/master/icons/' + iconName + '-15.svg',
imgSize: [15, 15]
})
});
iconCache[iconName] = icon;
}
return icon;
}
var styles = [];
return function (feature, resolution) {
var length = 0;
var layer = feature.get('layer');
var cls = feature.get('class');
var type = feature.get('type');
var scalerank = feature.get('scalerank');
var labelrank = feature.get('labelrank');
var adminLevel = feature.get('admin_level');
var maritime = feature.get('maritime');
var disputed = feature.get('disputed');
var maki = feature.get('maki');
var geom = feature.getGeometry().getType();
if (layer == 'landuse' && cls == 'park') {
fill.setColor('#d8e8c8');
styles[length++] = polygon;
} else if (layer == 'landuse' && cls == 'cemetery') {
fill.setColor('#e0e4dd');
styles[length++] = polygon;
} else if (layer == 'landuse' && cls == 'hospital') {
fill.setColor('#fde');
styles[length++] = polygon;
} else if (layer == 'landuse' && cls == 'school') {
fill.setColor('#f0e8f8');
styles[length++] = polygon;
} else if (layer == 'landuse' && cls == 'wood') {
fill.setColor('rgb(233,238,223)');
styles[length++] = polygon;
} else if (layer == 'waterway' &&
cls != 'river' && cls != 'stream' && cls != 'canal') {
stroke.setColor('#a0c8f0');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'waterway' && cls == 'river') {
stroke.setColor('#a0c8f0');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'waterway' && (cls == 'stream' ||
cls == 'canal')) {
stroke.setColor('#a0c8f0');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'water') {
fill.setColor('#a0c8f0');
styles[length++] = polygon;
} else if (layer == 'aeroway' && geom == 'Polygon') {
fill.setColor('rgb(242,239,235)');
styles[length++] = polygon;
} else if (layer == 'aeroway' && geom == 'LineString' &&
resolution <= 76.43702828517625) {
stroke.setColor('#f0ede9');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'building') {
fill.setColor('#f2eae2');
stroke.setColor('#dfdbd7');
stroke.setWidth(1);
styles[length++] = strokedPolygon;
} else if (layer == 'tunnel' && cls == 'motorway_link') {
stroke.setColor('#e9ac77');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'tunnel' && cls == 'service') {
stroke.setColor('#cfcdca');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'tunnel' &&
(cls == 'street' || cls == 'street_limited')) {
stroke.setColor('#cfcdca');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'tunnel' && cls == 'main' &&
resolution <= 1222.99245256282) {
stroke.setColor('#e9ac77');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'tunnel' && cls == 'motorway') {
stroke.setColor('#e9ac77');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'tunnel' && cls == 'path') {
stroke.setColor('#cba');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'tunnel' && cls == 'major_rail') {
stroke.setColor('#bbb');
stroke.setWidth(2);
styles[length++] = line;
} else if (layer == 'road' && cls == 'motorway_link') {
stroke.setColor('#e9ac77');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'road' && (cls == 'street' ||
cls == 'street_limited') && geom == 'LineString') {
stroke.setColor('#cfcdca');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'road' && cls == 'main' &&
resolution <= 1222.99245256282) {
stroke.setColor('#e9ac77');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'road' && cls == 'motorway' &&
resolution <= 4891.96981025128) {
stroke.setColor('#e9ac77');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'road' && cls == 'path') {
stroke.setColor('#cba');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'road' && cls == 'major_rail') {
stroke.setColor('#bbb');
stroke.setWidth(2);
styles[length++] = line;
} else if (layer == 'bridge' && cls == 'motorway_link') {
stroke.setColor('#e9ac77');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'bridge' && cls == 'motorway') {
stroke.setColor('#e9ac77');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'bridge' && cls == 'service') {
stroke.setColor('#cfcdca');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'bridge' &&
(cls == 'street' || cls == 'street_limited')) {
stroke.setColor('#cfcdca');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'bridge' && cls == 'main' &&
resolution <= 1222.99245256282) {
stroke.setColor('#e9ac77');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'bridge' && cls == 'path') {
stroke.setColor('#cba');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'bridge' && cls == 'major_rail') {
stroke.setColor('#bbb');
stroke.setWidth(2);
styles[length++] = line;
} else if (layer == 'admin' && adminLevel >= 3 && maritime === 0) {
stroke.setColor('#9e9cab');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'admin' && adminLevel == 2 &&
disputed === 0 && maritime === 0) {
stroke.setColor('#9e9cab');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'admin' && adminLevel == 2 &&
disputed === 1 && maritime === 0) {
stroke.setColor('#9e9cab');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'admin' && adminLevel >= 3 && maritime === 1) {
stroke.setColor('#a0c8f0');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'admin' && adminLevel == 2 && maritime === 1) {
stroke.setColor('#a0c8f0');
stroke.setWidth(1);
styles[length++] = line;
} else if (layer == 'country_label' && scalerank === 1) {
text.getText().setText(feature.get('name_en'));
text.getText().setFont('bold 11px "Open Sans", "Arial Unicode MS"');
fill.setColor('#334');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(2);
styles[length++] = text;
} else if (layer == 'country_label' && scalerank === 2 &&
resolution <= 19567.87924100512) {
text.getText().setText(feature.get('name_en'));
text.getText().setFont('bold 10px "Open Sans", "Arial Unicode MS"');
fill.setColor('#334');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(2);
styles[length++] = text;
} else if (layer == 'country_label' && scalerank === 3 &&
resolution <= 9783.93962050256) {
text.getText().setText(feature.get('name_en'));
text.getText().setFont('bold 9px "Open Sans", "Arial Unicode MS"');
fill.setColor('#334');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(2);
styles[length++] = text;
} else if (layer == 'country_label' && scalerank === 4 &&
resolution <= 4891.96981025128) {
text.getText().setText(feature.get('name_en'));
text.getText().setFont('bold 8px "Open Sans", "Arial Unicode MS"');
fill.setColor('#334');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(2);
styles[length++] = text;
} else if (layer == 'marine_label' && labelrank === 1 &&
geom == 'Point') {
text.getText().setText(feature.get('name_en'));
text.getText().setFont(
'italic 11px "Open Sans", "Arial Unicode MS"');
fill.setColor('#74aee9');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(1);
styles[length++] = text;
} else if (layer == 'marine_label' && labelrank === 2 &&
geom == 'Point') {
text.getText().setText(feature.get('name_en'));
text.getText().setFont(
'italic 11px "Open Sans", "Arial Unicode MS"');
fill.setColor('#74aee9');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(1);
styles[length++] = text;
} else if (layer == 'marine_label' && labelrank === 3 &&
geom == 'Point') {
text.getText().setText(feature.get('name_en'));
text.getText().setFont(
'italic 10px "Open Sans", "Arial Unicode MS"');
fill.setColor('#74aee9');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(1);
styles[length++] = text;
} else if (layer == 'marine_label' && labelrank === 4 &&
geom == 'Point') {
text.getText().setText(feature.get('name_en'));
text.getText().setFont(
'italic 9px "Open Sans", "Arial Unicode MS"');
fill.setColor('#74aee9');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(1);
styles[length++] = text;
} else if (layer == 'place_label' && type == 'city' &&
resolution <= 1222.99245256282) {
text.getText().setText(feature.get('name_en'));
text.getText().setFont('11px "Open Sans", "Arial Unicode MS"');
fill.setColor('#333');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(1);
styles[length++] = text;
} else if (layer == 'place_label' && type == 'town' &&
resolution <= 305.748113140705) {
text.getText().setText(feature.get('name_en'));
text.getText().setFont('9px "Open Sans", "Arial Unicode MS"');
fill.setColor('#333');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(1);
styles[length++] = text;
} else if (layer == 'place_label' && type == 'village' &&
resolution <= 38.21851414258813) {
text.getText().setText(feature.get('name_en'));
text.getText().setFont('8px "Open Sans", "Arial Unicode MS"');
fill.setColor('#333');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(1);
styles[length++] = text;
} else if (layer == 'place_label' &&
resolution <= 19.109257071294063 && (type == 'hamlet' ||
type == 'suburb' || type == 'neighbourhood')) {
text.getText().setText(feature.get('name_en'));
text.getText().setFont('bold 9px "Arial Narrow"');
fill.setColor('#633');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(1);
styles[length++] = text;
} else if (layer == 'poi_label' && resolution <= 19.109257071294063 &&
scalerank == 1 && maki !== 'marker') {
styles[length++] = getIcon(maki);
} else if (layer == 'poi_label' && resolution <= 9.554628535647032 &&
scalerank == 2 && maki !== 'marker') {
styles[length++] = getIcon(maki);
} else if (layer == 'poi_label' && resolution <= 4.777314267823516 &&
scalerank == 3 && maki !== 'marker') {
styles[length++] = getIcon(maki);
} else if (layer == 'poi_label' && resolution <= 2.388657133911758 &&
scalerank == 4 && maki !== 'marker') {
styles[length++] = getIcon(maki);
} else if (layer == 'poi_label' && resolution <= 1.194328566955879 &&
scalerank >= 5 && maki !== 'marker') {
styles[length++] = getIcon(maki);
} else {
fill.setColor('#a0c8f0');
stroke.setColor('rgba(255,255,255,0.8)');
stroke.setWidth(1);
styles[length++] = polygon;
}
styles.length = length;
return styles;
};
}
window.mvt = {
create: createMVTWithStyle,
StreetsV6Style: createMapboxStreetsV6Style
};
})(window);
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