// FIXME bulk feature upload - suppress events
// FIXME put features in an ol.Collection
// FIXME make change-detection more refined (notably, geometry hint)
goog.provide('ol.source.Vector');
goog.provide('ol.source.VectorEvent');
goog.provide('ol.source.VectorEventType');
goog.require('goog.array');
goog.require('goog.asserts');
goog.require('goog.events');
goog.require('goog.events.Event');
goog.require('goog.events.EventType');
goog.require('goog.object');
goog.require('ol.ObjectEventType');
goog.require('ol.proj');
goog.require('ol.source.Source');
goog.require('ol.structs.RBush');
/**
* @enum {string}
*/
ol.source.VectorEventType = {
/**
* Triggered when a feature is added to the source.
* @event ol.source.VectorEvent#addfeature
* @api stable
*/
ADDFEATURE: 'addfeature',
/**
* Triggered when a feature is removed from the source.
* @event ol.source.VectorEvent#removefeature
* @api stable
*/
REMOVEFEATURE: 'removefeature'
};
/**
* @classdesc
* Base class for vector sources.
*
* @constructor
* @extends {ol.source.Source}
* @fires ol.source.VectorEvent
* @param {olx.source.VectorOptions=} opt_options Vector source options.
* @api stable
*/
ol.source.Vector = function(opt_options) {
var options = goog.isDef(opt_options) ? opt_options : {};
goog.base(this, {
attributions: options.attributions,
logo: options.logo,
projection: options.projection,
state: goog.isDef(options.state) ?
/** @type {ol.source.State} */ (options.state) : undefined
});
/**
* @private
* @type {ol.structs.RBush.<ol.Feature>}
*/
this.rBush_ = new ol.structs.RBush();
/**
* @private
* @type {Object.<string, ol.Feature>}
*/
this.nullGeometryFeatures_ = {};
/**
* A lookup of features by id (the return from feature.getId()).
* @private
* @type {Object.<string, ol.Feature>}
*/
this.idIndex_ = {};
/**
* A lookup of features without id (keyed by goog.getUid(feature)).
* @private
* @type {Object.<string, ol.Feature>}
*/
this.undefIdIndex_ = {};
/**
* @private
* @type {Object.<string, Array.<goog.events.Key>>}
*/
this.featureChangeKeys_ = {};
if (goog.isDef(options.features)) {
this.addFeaturesInternal(options.features);
}
};
goog.inherits(ol.source.Vector, ol.source.Source);
/**
* @param {ol.Feature} feature Feature.
* @api stable
*/
ol.source.Vector.prototype.addFeature = function(feature) {
this.addFeatureInternal(feature);
this.dispatchChangeEvent();
};
/**
* Add a feature without firing a `change` event.
* @param {ol.Feature} feature Feature.
* @protected
*/
ol.source.Vector.prototype.addFeatureInternal = function(feature) {
var featureKey = goog.getUid(feature).toString();
goog.asserts.assert(!(featureKey in this.featureChangeKeys_));
this.featureChangeKeys_[featureKey] = [
goog.events.listen(feature,
goog.events.EventType.CHANGE,
this.handleFeatureChange_, false, this),
goog.events.listen(feature,
ol.ObjectEventType.PROPERTYCHANGE,
this.handleFeatureChange_, false, this)
];
var geometry = feature.getGeometry();
if (goog.isDefAndNotNull(geometry)) {
var extent = geometry.getExtent();
this.rBush_.insert(extent, feature);
} else {
this.nullGeometryFeatures_[featureKey] = feature;
}
var id = feature.getId();
if (goog.isDef(id)) {
this.idIndex_[id.toString()] = feature;
} else {
goog.asserts.assert(!(featureKey in this.undefIdIndex_),
'Feature already added to the source');
this.undefIdIndex_[featureKey] = feature;
}
this.dispatchEvent(
new ol.source.VectorEvent(ol.source.VectorEventType.ADDFEATURE, feature));
};
/**
* @param {Array.<ol.Feature>} features Features.
* @api stable
*/
ol.source.Vector.prototype.addFeatures = function(features) {
this.addFeaturesInternal(features);
this.dispatchChangeEvent();
};
/**
* Add features without firing a `change` event.
* @param {Array.<ol.Feature>} features Features.
* @protected
*/
ol.source.Vector.prototype.addFeaturesInternal = function(features) {
// FIXME use R-Bush bulk load when available
var i, ii;
for (i = 0, ii = features.length; i < ii; ++i) {
this.addFeatureInternal(features[i]);
}
};
/**
* Remove all features.
* @api stable
*/
ol.source.Vector.prototype.clear = function() {
this.rBush_.forEach(this.removeFeatureInternal, this);
this.rBush_.clear();
goog.object.forEach(
this.nullGeometryFeatures_, this.removeFeatureInternal, this);
goog.object.clear(this.nullGeometryFeatures_);
goog.asserts.assert(goog.object.isEmpty(this.featureChangeKeys_));
this.dispatchChangeEvent();
};
/**
* @param {function(this: T, ol.Feature): S} f Callback.
* @param {T=} opt_this The object to use as `this` in `f`.
* @return {S|undefined}
* @template T,S
* @api stable
*/
ol.source.Vector.prototype.forEachFeature = function(f, opt_this) {
return this.rBush_.forEach(f, opt_this);
};
/**
* @param {ol.Coordinate} coordinate Coordinate.
* @param {function(this: T, ol.Feature): S} f Callback.
* @param {T=} opt_this The object to use as `this` in `f`.
* @return {S|undefined}
* @template T,S
*/
ol.source.Vector.prototype.forEachFeatureAtCoordinate =
function(coordinate, f, opt_this) {
var extent = [coordinate[0], coordinate[1], coordinate[0], coordinate[1]];
return this.forEachFeatureInExtent(extent, function(feature) {
var geometry = feature.getGeometry();
goog.asserts.assert(goog.isDefAndNotNull(geometry));
if (geometry.containsCoordinate(coordinate)) {
return f.call(opt_this, feature);
} else {
return undefined;
}
});
};
/**
* @param {ol.Extent} extent Extent.
* @param {function(this: T, ol.Feature): S} f Callback.
* @param {T=} opt_this The object to use as `this` in `f`.
* @return {S|undefined}
* @template T,S
* @api
*/
ol.source.Vector.prototype.forEachFeatureInExtent =
function(extent, f, opt_this) {
return this.rBush_.forEachInExtent(extent, f, opt_this);
};
/**
* @param {ol.Extent} extent Extent.
* @param {number} resolution Resolution.
* @param {function(this: T, ol.Feature): S} f Callback.
* @param {T=} opt_this The object to use as `this` in `f`.
* @return {S|undefined}
* @template T,S
*/
ol.source.Vector.prototype.forEachFeatureInExtentAtResolution =
function(extent, resolution, f, opt_this) {
return this.forEachFeatureInExtent(extent, f, opt_this);
};
/**
* @return {Array.<ol.Feature>} Features.
* @api stable
*/
ol.source.Vector.prototype.getFeatures = function() {
var features = this.rBush_.getAll();
if (!goog.object.isEmpty(this.nullGeometryFeatures_)) {
goog.array.extend(
features, goog.object.getValues(this.nullGeometryFeatures_));
}
return features;
};
/**
* @param {ol.Coordinate} coordinate Coordinate.
* @return {Array.<ol.Feature>} Features.
* @api stable
*/
ol.source.Vector.prototype.getFeaturesAtCoordinate = function(coordinate) {
var features = [];
this.forEachFeatureAtCoordinate(coordinate, function(feature) {
features.push(feature);
});
return features;
};
/**
* @param {ol.Extent} extent Extent.
* @return {Array.<ol.Feature>} Features.
*/
ol.source.Vector.prototype.getFeaturesInExtent = function(extent) {
return this.rBush_.getInExtent(extent);
};
/**
* @param {ol.Coordinate} coordinate Coordinate.
* @return {ol.Feature} Closest feature.
* @api stable
*/
ol.source.Vector.prototype.getClosestFeatureToCoordinate =
function(coordinate) {
// Find the closest feature using branch and bound. We start searching an
// infinite extent, and find the distance from the first feature found. This
// becomes the closest feature. We then compute a smaller extent which any
// closer feature must intersect. We continue searching with this smaller
// extent, trying to find a closer feature. Every time we find a closer
// feature, we update the extent being searched so that any even closer
// feature must intersect it. We continue until we run out of features.
var x = coordinate[0];
var y = coordinate[1];
var closestFeature = null;
var closestPoint = [NaN, NaN];
var minSquaredDistance = Infinity;
var extent = [-Infinity, -Infinity, Infinity, Infinity];
this.rBush_.forEachInExtent(extent,
/**
* @param {ol.Feature} feature Feature.
*/
function(feature) {
var geometry = feature.getGeometry();
goog.asserts.assert(goog.isDefAndNotNull(geometry));
var previousMinSquaredDistance = minSquaredDistance;
minSquaredDistance = geometry.closestPointXY(
x, y, closestPoint, minSquaredDistance);
if (minSquaredDistance < previousMinSquaredDistance) {
closestFeature = feature;
// This is sneaky. Reduce the extent that it is currently being
// searched while the R-Tree traversal using this same extent object
// is still in progress. This is safe because the new extent is
// strictly contained by the old extent.
var minDistance = Math.sqrt(minSquaredDistance);
extent[0] = x - minDistance;
extent[1] = y - minDistance;
extent[2] = x + minDistance;
extent[3] = y + minDistance;
}
});
return closestFeature;
};
/**
* Get the extent of the features currently in the source.
* @return {ol.Extent} Extent.
* @api stable
*/
ol.source.Vector.prototype.getExtent = function() {
return this.rBush_.getExtent();
};
/**
* Get a feature by its identifier (the value returned by feature.getId()).
* Note that the index treats string and numeric identifiers as the same. So
* `source.getFeatureById(2)` will return a feature with id `'2'` or `2`.
*
* @param {string|number} id Feature identifier.
* @return {ol.Feature} The feature (or `null` if not found).
* @api stable
*/
ol.source.Vector.prototype.getFeatureById = function(id) {
var feature = this.idIndex_[id.toString()];
return goog.isDef(feature) ? feature : null;
};
/**
* @param {goog.events.Event} event Event.
* @private
*/
ol.source.Vector.prototype.handleFeatureChange_ = function(event) {
var feature = /** @type {ol.Feature} */ (event.target);
var featureKey = goog.getUid(feature).toString();
var geometry = feature.getGeometry();
if (!goog.isDefAndNotNull(geometry)) {
if (!(featureKey in this.nullGeometryFeatures_)) {
this.rBush_.remove(feature);
this.nullGeometryFeatures_[featureKey] = feature;
}
} else {
var extent = geometry.getExtent();
if (featureKey in this.nullGeometryFeatures_) {
delete this.nullGeometryFeatures_[featureKey];
this.rBush_.insert(extent, feature);
} else {
this.rBush_.update(extent, feature);
}
}
var id = feature.getId();
var removed;
if (goog.isDef(id)) {
var sid = id.toString();
if (featureKey in this.undefIdIndex_) {
delete this.undefIdIndex_[featureKey];
this.idIndex_[sid] = feature;
} else {
if (this.idIndex_[sid] !== feature) {
removed = this.removeFromIdIndex_(feature);
goog.asserts.assert(removed,
'Expected feature to be removed from index');
this.idIndex_[sid] = feature;
}
}
} else {
if (!(featureKey in this.undefIdIndex_)) {
removed = this.removeFromIdIndex_(feature);
goog.asserts.assert(removed,
'Expected feature to be removed from index');
this.undefIdIndex_[featureKey] = feature;
} else {
goog.asserts.assert(this.undefIdIndex_[featureKey] === feature);
}
}
this.dispatchChangeEvent();
};
/**
* @return {boolean} Is empty.
*/
ol.source.Vector.prototype.isEmpty = function() {
return this.rBush_.isEmpty() &&
goog.object.isEmpty(this.nullGeometryFeatures_);
};
/**
* @param {ol.Extent} extent Extent.
* @param {number} resolution Resolution.
* @param {ol.proj.Projection} projection Projection.
*/
ol.source.Vector.prototype.loadFeatures = goog.nullFunction;
/**
* @param {ol.Feature} feature Feature.
* @api stable
*/
ol.source.Vector.prototype.removeFeature = function(feature) {
var featureKey = goog.getUid(feature).toString();
if (featureKey in this.nullGeometryFeatures_) {
delete this.nullGeometryFeatures_[featureKey];
} else {
this.rBush_.remove(feature);
}
this.removeFeatureInternal(feature);
this.dispatchChangeEvent();
};
/**
* Remove feature without firing a `change` event.
* @param {ol.Feature} feature Feature.
* @protected
*/
ol.source.Vector.prototype.removeFeatureInternal = function(feature) {
var featureKey = goog.getUid(feature).toString();
goog.asserts.assert(featureKey in this.featureChangeKeys_);
goog.array.forEach(this.featureChangeKeys_[featureKey],
goog.events.unlistenByKey);
delete this.featureChangeKeys_[featureKey];
var id = feature.getId();
if (goog.isDef(id)) {
delete this.idIndex_[id.toString()];
} else {
delete this.undefIdIndex_[featureKey];
}
this.dispatchEvent(new ol.source.VectorEvent(
ol.source.VectorEventType.REMOVEFEATURE, feature));
};
/**
* Remove a feature from the id index. Called internally when the feature id
* may have changed.
* @param {ol.Feature} feature The feature.
* @return {boolean} Removed the feature from the index.
* @private
*/
ol.source.Vector.prototype.removeFromIdIndex_ = function(feature) {
var removed = false;
for (var id in this.idIndex_) {
if (this.idIndex_[id] === feature) {
delete this.idIndex_[id];
removed = true;
break;
}
}
return removed;
};
/**
* @classdesc
* Events emitted by {@link ol.source.Vector} instances are instances of this
* type.
*
* @constructor
* @extends {goog.events.Event}
* @implements {oli.source.VectorEvent}
* @param {string} type Type.
* @param {ol.Feature=} opt_feature Feature.
*/
ol.source.VectorEvent = function(type, opt_feature) {
goog.base(this, type);
/**
* The feature being added or removed.
* @type {ol.Feature|undefined}
* @api stable
*/
this.feature = opt_feature;
};
goog.inherits(ol.source.VectorEvent, goog.events.Event);
OpenLayers 3