476 lines
14 KiB
JavaScript
476 lines
14 KiB
JavaScript
goog.provide('ol.layer.Vector');
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goog.require('goog.array');
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goog.require('goog.asserts');
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goog.require('goog.events.EventType');
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goog.require('goog.object');
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goog.require('ol.Feature');
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goog.require('ol.expr');
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goog.require('ol.expr.Literal');
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goog.require('ol.expr.Logical');
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goog.require('ol.expr.LogicalOp');
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goog.require('ol.expr.functions');
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goog.require('ol.geom.GeometryType');
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goog.require('ol.geom.SharedVertices');
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goog.require('ol.layer.Layer');
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goog.require('ol.proj');
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goog.require('ol.source.Vector');
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goog.require('ol.structs.RTree');
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goog.require('ol.style.Style');
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goog.require('ol.style.TextLiteral');
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/**
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* @constructor
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*/
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ol.layer.FeatureCache = function() {
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/**
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* @type {Object.<string, ol.Feature>}
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* @private
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*/
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this.idLookup_;
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/**
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* @type {Object.<string, ol.Feature>}
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* @private
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*/
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this.geometryTypeIndex_;
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/**
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* @type {ol.structs.RTree}
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* @private
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*/
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this.rTree_;
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this.clear();
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};
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/**
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* Clear the cache.
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*/
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ol.layer.FeatureCache.prototype.clear = function() {
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this.idLookup_ = {};
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var geometryTypeIndex = {};
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for (var key in ol.geom.GeometryType) {
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geometryTypeIndex[ol.geom.GeometryType[key]] = {};
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}
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this.geometryTypeIndex_ = geometryTypeIndex;
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this.rTree_ = new ol.structs.RTree();
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};
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/**
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* Add a feature to the cache.
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* @param {ol.Feature} feature Feature to be cached.
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*/
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ol.layer.FeatureCache.prototype.add = function(feature) {
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var id = goog.getUid(feature).toString(),
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geometry = feature.getGeometry();
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this.idLookup_[id] = feature;
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// index by geometry type and bounding box
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if (!goog.isNull(geometry)) {
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var geometryType = geometry.getType();
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this.geometryTypeIndex_[geometryType][id] = feature;
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this.rTree_.insert(geometry.getBounds(),
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feature, geometryType);
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}
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};
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/**
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* @param {ol.expr.Expression=} opt_expr Expression for filtering.
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* @return {Object.<string, ol.Feature>} Object of features, keyed by id.
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*/
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ol.layer.FeatureCache.prototype.getFeaturesObject = function(opt_expr) {
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var features;
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if (!goog.isDef(opt_expr)) {
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features = this.idLookup_;
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} else {
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// check for geometryType or extent expression
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var name = ol.expr.isLibCall(opt_expr);
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if (name === ol.expr.functions.GEOMETRY_TYPE) {
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var args = /** @type {ol.expr.Call} */ (opt_expr).getArgs();
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goog.asserts.assert(args.length === 1);
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goog.asserts.assert(args[0] instanceof ol.expr.Literal);
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var type = /** @type {ol.expr.Literal } */ (args[0]).evaluate();
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goog.asserts.assertString(type);
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features = this.geometryTypeIndex_[type];
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} else if (name === ol.expr.functions.EXTENT) {
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var args = /** @type {ol.expr.Call} */ (opt_expr).getArgs();
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goog.asserts.assert(args.length === 4);
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var extent = [];
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for (var i = 0; i < 4; ++i) {
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goog.asserts.assert(args[i] instanceof ol.expr.Literal);
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extent[i] = /** @type {ol.expr.Literal} */ (args[i]).evaluate();
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goog.asserts.assertNumber(extent[i]);
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}
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features = this.rTree_.searchReturningObject(extent);
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} else {
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// not a call expression, check logical
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if (opt_expr instanceof ol.expr.Logical) {
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var op = /** @type {ol.expr.Logical} */ (opt_expr).getOperator();
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if (op === ol.expr.LogicalOp.AND) {
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var expressions = [opt_expr.getLeft(), opt_expr.getRight()];
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var expr, args, type, extent;
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for (var i = 0; i <= 1; ++i) {
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expr = expressions[i];
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name = ol.expr.isLibCall(expr);
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if (name === ol.expr.functions.GEOMETRY_TYPE) {
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args = /** @type {ol.expr.Call} */ (expr).getArgs();
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goog.asserts.assert(args.length === 1);
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goog.asserts.assert(args[0] instanceof ol.expr.Literal);
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type = /** @type {ol.expr.Literal } */ (args[0]).evaluate();
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goog.asserts.assertString(type);
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} else if (name === ol.expr.functions.EXTENT) {
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args = /** @type {ol.expr.Call} */ (expr).getArgs();
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goog.asserts.assert(args.length === 4);
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extent = [];
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for (var j = 0; j < 4; ++j) {
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goog.asserts.assert(args[j] instanceof ol.expr.Literal);
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extent[j] =
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/** @type {ol.expr.Literal} */ (args[j]).evaluate();
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goog.asserts.assertNumber(extent[j]);
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}
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}
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}
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if (type && extent) {
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features = this.getFeaturesObjectForExtent(extent,
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/** @type {ol.geom.GeometryType} */ (type));
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}
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}
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}
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}
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if (!goog.isDef(features)) {
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// TODO: support fast lane for other filter types
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var candidates = this.idLookup_,
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feature;
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features = {};
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for (i in candidates) {
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feature = candidates[i];
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if (ol.expr.evaluateFeature(opt_expr, feature)) {
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features[i] = feature;
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}
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}
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}
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}
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return features;
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};
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/**
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* Get all features whose bounding box intersects the provided extent.
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*
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* @param {ol.Extent} extent Bounding extent.
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* @param {ol.geom.GeometryType=} opt_type Optional geometry type.
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* @return {Object.<string, ol.Feature>} Features.
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*/
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ol.layer.FeatureCache.prototype.getFeaturesObjectForExtent = function(extent,
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opt_type) {
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var features;
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if (goog.isDef(opt_type) &&
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goog.object.isEmpty(this.geometryTypeIndex_[opt_type])) {
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features = {};
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} else {
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features = this.rTree_.searchReturningObject(extent, opt_type);
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}
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return features;
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};
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/**
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* Get features by ids.
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* @param {Array.<string>} ids Array of (internal) identifiers.
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* @return {Array.<ol.Feature>} Array of features.
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* @private
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*/
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ol.layer.FeatureCache.prototype.getFeaturesByIds_ = function(ids) {
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var len = ids.length,
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features = new Array(len),
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i;
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for (i = 0; i < len; ++i) {
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features[i] = this.idLookup_[ids[i]];
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}
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return features;
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};
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/**
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* @constructor
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* @extends {ol.layer.Layer}
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* @param {ol.layer.VectorLayerOptions} options Vector layer options.
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*/
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ol.layer.Vector = function(options) {
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goog.base(this, {
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opacity: options.opacity,
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source: options.source,
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visible: options.visible
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});
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/**
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* @private
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* @type {ol.style.Style}
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*/
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this.style_ = goog.isDef(options.style) ? options.style : null;
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/**
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* @type {ol.layer.FeatureCache}
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* @private
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*/
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this.featureCache_ = new ol.layer.FeatureCache();
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/**
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* @type {function(Array.<ol.Feature>):string}
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* @private
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*/
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this.transformFeatureInfo_ = goog.isDef(options.transformFeatureInfo) ?
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options.transformFeatureInfo : ol.layer.Vector.uidTransformFeatureInfo;
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/**
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* TODO: this means we need to know dimension at construction
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* @type {ol.geom.SharedVertices}
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* @private
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*/
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this.pointVertices_ = new ol.geom.SharedVertices();
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/**
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* TODO: this means we need to know dimension at construction
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* @type {ol.geom.SharedVertices}
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* @private
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*/
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this.lineVertices_ = new ol.geom.SharedVertices();
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/**
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* TODO: this means we need to know dimension at construction
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* @type {ol.geom.SharedVertices}
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* @private
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*/
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this.polygonVertices_ = new ol.geom.SharedVertices();
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};
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goog.inherits(ol.layer.Vector, ol.layer.Layer);
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/**
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* @param {Array.<ol.Feature>} features Array of features.
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*/
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ol.layer.Vector.prototype.addFeatures = function(features) {
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for (var i = 0, ii = features.length; i < ii; ++i) {
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this.featureCache_.add(features[i]);
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}
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// TODO: events for real - listeners want features and extent here
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this.dispatchEvent(goog.events.EventType.CHANGE);
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};
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/**
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* @return {ol.source.Vector} Source.
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*/
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ol.layer.Vector.prototype.getVectorSource = function() {
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return /** @type {ol.source.Vector} */ (this.getSource());
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};
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/**
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* @param {ol.expr.Expression=} opt_expr Expression for filtering.
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* @return {Array.<ol.Feature>} Array of features.
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*/
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ol.layer.Vector.prototype.getFeatures = function(opt_expr) {
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return goog.object.getValues(
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this.featureCache_.getFeaturesObject(opt_expr));
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};
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/**
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* @param {ol.expr.Expression=} opt_expr Expression for filtering.
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* @return {Object.<string, ol.Feature>} Features.
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*/
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ol.layer.Vector.prototype.getFeaturesObject = function(opt_expr) {
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return this.featureCache_.getFeaturesObject(opt_expr);
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};
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/**
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* Get all features whose bounding box intersects the provided extent.
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*
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* @param {ol.Extent} extent Bounding extent.
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* @param {ol.geom.GeometryType=} opt_type Optional geometry type.
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* @return {Object.<string, ol.Feature>} Features.
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*/
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ol.layer.Vector.prototype.getFeaturesObjectForExtent = function(extent,
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opt_type) {
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return this.featureCache_.getFeaturesObjectForExtent(extent, opt_type);
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};
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/**
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* @return {ol.geom.SharedVertices} Shared line vertices.
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*/
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ol.layer.Vector.prototype.getLineVertices = function() {
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return this.lineVertices_;
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};
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/**
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* @return {ol.geom.SharedVertices} Shared point vertices.
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*/
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ol.layer.Vector.prototype.getPointVertices = function() {
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return this.pointVertices_;
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};
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/**
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* @return {ol.geom.SharedVertices} Shared polygon vertices.
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*/
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ol.layer.Vector.prototype.getPolygonVertices = function() {
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return this.polygonVertices_;
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};
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/**
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* @param {Object.<string, ol.Feature>} features Features.
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* @return {Array.<Array>} symbolizers for features. Each array in this array
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* contains 3 items: an array of features, the symbolizer literal, and
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* an array with optional additional data for each feature.
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*/
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ol.layer.Vector.prototype.groupFeaturesBySymbolizerLiteral =
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function(features) {
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var uniqueLiterals = {},
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featuresBySymbolizer = [],
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style = this.style_,
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i, j, l, feature, literals, numLiterals, literal, uniqueLiteral, key,
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item;
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for (i in features) {
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feature = features[i];
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literals = feature.getSymbolizerLiterals();
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if (goog.isNull(literals)) {
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literals = goog.isNull(style) ?
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ol.style.Style.applyDefaultStyle(feature) :
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style.apply(feature);
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}
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numLiterals = literals.length;
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for (j = 0; j < numLiterals; ++j) {
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literal = literals[j];
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for (l in uniqueLiterals) {
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uniqueLiteral = featuresBySymbolizer[uniqueLiterals[l]][1];
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if (literal.equals(uniqueLiteral)) {
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literal = uniqueLiteral;
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break;
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}
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}
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key = goog.getUid(literal);
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if (!goog.object.containsKey(uniqueLiterals, key)) {
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uniqueLiterals[key] = featuresBySymbolizer.length;
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featuresBySymbolizer.push([
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/** @type {Array.<ol.Feature>} */ ([]),
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/** @type {ol.style.SymbolizerLiteral} */ (literal),
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/** @type {Array} */ ([])
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]);
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}
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item = featuresBySymbolizer[uniqueLiterals[key]];
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item[0].push(feature);
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if (literal instanceof ol.style.TextLiteral) {
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item[2].push(literals[j].text);
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}
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}
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}
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return featuresBySymbolizer;
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};
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/**
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* @param {Object|Element|Document|string} data Feature data.
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* @param {ol.parser.Parser} parser Feature parser.
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* @param {ol.Projection} projection This sucks. The layer should be a view in
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* one projection.
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*/
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ol.layer.Vector.prototype.parseFeatures = function(data, parser, projection) {
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var features;
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var lookup = {};
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lookup[ol.geom.GeometryType.POINT] = this.pointVertices_;
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lookup[ol.geom.GeometryType.LINESTRING] = this.lineVertices_;
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lookup[ol.geom.GeometryType.POLYGON] = this.polygonVertices_;
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lookup[ol.geom.GeometryType.MULTIPOINT] = this.pointVertices_;
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lookup[ol.geom.GeometryType.MULTILINESTRING] = this.lineVertices_;
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lookup[ol.geom.GeometryType.MULTIPOLYGON] = this.polygonVertices_;
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var callback = function(feature, type) {
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return lookup[type];
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};
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var addFeatures = function(features) {
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var sourceProjection = this.getSource().getProjection();
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var transform = ol.proj.getTransform(sourceProjection, projection);
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transform(
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this.pointVertices_.coordinates,
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this.pointVertices_.coordinates,
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this.pointVertices_.getDimension());
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transform(
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this.lineVertices_.coordinates,
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this.lineVertices_.coordinates,
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this.lineVertices_.getDimension());
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transform(
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this.polygonVertices_.coordinates,
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this.polygonVertices_.coordinates,
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this.polygonVertices_.getDimension());
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this.addFeatures(features);
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};
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var options = {callback: callback};
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if (goog.isString(data)) {
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if (goog.isFunction(parser.readFeaturesFromStringAsync)) {
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parser.readFeaturesFromStringAsync(data, goog.bind(addFeatures, this),
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options);
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} else {
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goog.asserts.assert(goog.isFunction(parser.readFeaturesFromString),
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'Expected a parser with readFeaturesFromString method.');
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features = parser.readFeaturesFromString(data, options);
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addFeatures.call(this, features);
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}
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} else if (goog.isObject(data)) {
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if (goog.isFunction(parser.readFeaturesFromObjectAsync)) {
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parser.readFeaturesFromObjectAsync(data, goog.bind(addFeatures, this),
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options);
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} else {
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goog.asserts.assert(goog.isFunction(parser.readFeaturesFromObject),
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'Expected a parser with a readFeaturesFromObject method.');
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features = parser.readFeaturesFromObject(data, options);
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addFeatures.call(this, features);
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}
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} else {
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// TODO: parse more data types
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throw new Error('Data type not supported: ' + data);
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}
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};
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/**
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* @return {function(Array.<ol.Feature>):string} Feature info function.
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*/
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ol.layer.Vector.prototype.getTransformFeatureInfo = function() {
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return this.transformFeatureInfo_;
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};
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/**
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* @param {Array.<ol.Feature>} features Features.
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* @return {string} Feature info.
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*/
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ol.layer.Vector.uidTransformFeatureInfo = function(features) {
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var featureIds = goog.array.map(features,
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function(feature) { return goog.getUid(feature); });
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return featureIds.join(', ');
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};
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