Add ol.source.TileVector

src/ol/source/tilevectorsource.js

@@ -0,0 +1,284 @@
+// FIXME implement getClosestFeatureToCoordinate
+// FIXME implement getExtent
+// FIXME handle different Zs
+
+goog.provide('ol.source.TileVector');
+
+goog.require('goog.array');
+goog.require('goog.object');
+goog.require('ol.TileCoord');
+goog.require('ol.TileUrlFunction');
+goog.require('ol.source.FormatVector');
+goog.require('ol.source.State');
+goog.require('ol.tilegrid.TileGrid');
+
+
+
+/**
+ * @constructor
+ * @extends {ol.source.FormatVector}
+ * @param {olx.source.TileVectorOptions} options Options.
+ */
+ol.source.TileVector = function(options) {
+
+  goog.base(this, {
+    attributions: options.attributions,
+    extent: options.extent,
+    format: options.format,
+    logo: options.logo,
+    projection: options.projection
+  });
+
+  var tileGrid = options.tileGrid;
+  var z = options.z;
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.resolution_ = tileGrid.getResolution(z);
+
+  /**
+   * @private
+   * @type {ol.tilegrid.TileGrid}
+   */
+  this.tileGrid_ = options.tileGrid;
+
+  /**
+   * @private
+   * @type {ol.TileUrlFunctionType}
+   */
+  this.tileUrlFunction_ = ol.TileUrlFunction.nullTileUrlFunction;
+
+  /**
+   * @private
+   * @type {ol.TileCoordTransformType}
+   */
+  this.tileCoordTransform_ = tileGrid.createTileCoordTransform({
+    extent: options.extent
+  });
+
+  /**
+   * @private
+   * @type {Object.<string, Array.<ol.Feature>>}
+   */
+  this.tiles_ = {};
+
+  /**
+   * @private
+   * @type {number}
+   */
+  this.z_ = z;
+
+  if (goog.isDef(options.tileUrlFunction)) {
+    this.setTileUrlFunction(options.tileUrlFunction);
+  } else if (goog.isDef(options.urls)) {
+    this.setUrls(options.urls);
+  } else if (goog.isDef(options.url)) {
+    this.setUrl(options.url);
+  }
+
+};
+goog.inherits(ol.source.TileVector, ol.source.FormatVector);
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileVector.prototype.addFeature = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileVector.prototype.addFeatures = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileVector.prototype.clear = function() {
+  goog.object.clear(this.tiles_);
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileVector.prototype.forEachFeature = function(f, opt_this) {
+  var tiles = this.tiles_;
+  var tileKey;
+  for (tileKey in tiles) {
+    var features = tiles[tileKey];
+    var i, ii;
+    for (i = 0, ii = features.length; i < ii; ++i) {
+      var result = f.call(opt_this, features[i]);
+      if (result) {
+        return result;
+      }
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileVector.prototype.forEachFeatureInExtent =
+    function(extent, f, opt_this) {
+  var resolution = this.resolution_;
+  var tileGrid = this.tileGrid_;
+  var tiles = this.tiles_;
+  var z = this.z_;
+  var tileRange =
+      tileGrid.getTileRangeForExtentAndResolution(extent, resolution);
+  var x, y;
+  for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
+    for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
+      var tileKey = this.getTileKeyZXY_(z, x, y);
+      var features = tiles[tileKey];
+      if (goog.isDef(features)) {
+        var i, ii;
+        for (i = 0, ii = features.length; i < ii; ++i) {
+          var result = f.call(opt_this, features[i]);
+          if (result) {
+            return result;
+          }
+        }
+      }
+    }
+  }
+  return undefined;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileVector.prototype.getClosestFeatureToCoordinate =
+    goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileVector.prototype.getExtent = goog.abstractMethod;
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileVector.prototype.getFeatures = function() {
+  var tiles = this.tiles_;
+  var features = [];
+  var tileKey;
+  for (tileKey in tiles) {
+    goog.array.extend(features, tiles[tileKey]);
+  }
+  return features;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileVector.prototype.getFeaturesInExtent = function(extent) {
+  var features = [];
+  this.forEachFeatureInExtent(extent,
+      /**
+       * @param {ol.Feature} feature Feature.
+       */
+      function(feature) {
+        features.push(feature);
+      });
+  return features;
+};
+
+
+/**
+ * @param {number} z Z.
+ * @param {number} x X.
+ * @param {number} y Y.
+ * @private
+ * @return {string} Tile key.
+ */
+ol.source.TileVector.prototype.getTileKeyZXY_ = function(z, x, y) {
+  return z + '/' + x + '/' + y;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileVector.prototype.loadFeatures =
+    function(extent, resolution, projection) {
+  // FIXME should use resolution argument rather than this.resolution_
+  var tileCoordTransform = this.tileCoordTransform_;
+  var tileGrid = this.tileGrid_;
+  var tileUrlFunction = this.tileUrlFunction_;
+  var tiles = this.tiles_;
+  var z = this.z_;
+  var tileRange =
+      tileGrid.getTileRangeForExtentAndResolution(extent, this.resolution_);
+  var tileCoord = new ol.TileCoord(z, 0, 0);
+  var x, y;
+  for (x = tileRange.minX; x <= tileRange.maxX; ++x) {
+    for (y = tileRange.minY; y <= tileRange.maxY; ++y) {
+      var tileKey = this.getTileKeyZXY_(z, x, y);
+      if (!(tileKey in tiles)) {
+        tileCoord.z = z;
+        tileCoord.x = x;
+        tileCoord.y = y;
+        tileCoordTransform(tileCoord, projection, tileCoord);
+        var url = tileUrlFunction(tileCoord, 1, projection);
+        if (goog.isDef(url)) {
+          tiles[tileKey] = [];
+          this.loadFeaturesFromURL(url, goog.partial(
+              /**
+               * @param {string} tileKey Tile key.
+               * @param {Array.<ol.Feature>} features Features.
+               * @this {ol.source.TileVector}
+               */
+              function(tileKey, features) {
+                tiles[tileKey] = features;
+                this.setState(ol.source.State.READY);
+              }, tileKey), this);
+        }
+      }
+    }
+  }
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.source.TileVector.prototype.removeFeature = goog.abstractMethod;
+
+
+/**
+ * @param {ol.TileUrlFunctionType} tileUrlFunction Tile URL function.
+ */
+ol.source.TileVector.prototype.setTileUrlFunction = function(tileUrlFunction) {
+  this.tileUrlFunction_ = tileUrlFunction;
+  this.dispatchChangeEvent();
+};
+
+
+/**
+ * @param {string} url URL.
+ * @todo stability experimental
+ */
+ol.source.TileVector.prototype.setUrl = function(url) {
+  this.setTileUrlFunction(ol.TileUrlFunction.createFromTemplates(
+      ol.TileUrlFunction.expandUrl(url)));
+};
+
+
+/**
+ * @param {Array.<string>} urls URLs.
+ */
+ol.source.TileVector.prototype.setUrls = function(urls) {
+  this.setTileUrlFunction(ol.TileUrlFunction.createFromTemplates(urls));
+};