622 lines
17 KiB
JavaScript
622 lines
17 KiB
JavaScript
goog.provide('ol.interaction.Snap');
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goog.provide('ol.interaction.SnapProperty');
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goog.require('goog.array');
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goog.require('goog.asserts');
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goog.require('goog.events');
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goog.require('goog.events.EventType');
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goog.require('goog.object');
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goog.require('ol.Collection');
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goog.require('ol.CollectionEvent');
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goog.require('ol.CollectionEventType');
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goog.require('ol.Extent');
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goog.require('ol.Feature');
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goog.require('ol.Object');
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goog.require('ol.Observable');
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goog.require('ol.coordinate');
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goog.require('ol.extent');
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goog.require('ol.geom.Geometry');
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goog.require('ol.interaction.Pointer');
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goog.require('ol.source.Vector');
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goog.require('ol.source.VectorEvent');
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goog.require('ol.source.VectorEventType');
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goog.require('ol.structs.RBush');
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/**
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* @classdesc
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* Handles snapping of vector features while modifying or drawing them. The
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* features can come from a {@link ol.source.Vector} or {@link ol.Collection}
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* Any interaction object that allows the user to interact
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* with the features using the mouse can benefit from the snapping, as long
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* as it is added before.
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*
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* The snap interaction modifies map browser event `coordinate` and `pixel`
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* properties to force the snap to occur to any interaction that them.
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*
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* Example:
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*
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* var snap = new ol.interaction.Snap({
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* source: source
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* });
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*
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* @constructor
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* @extends {ol.interaction.Pointer}
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* @param {olx.interaction.SnapOptions=} opt_options Options.
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* @api
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*/
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ol.interaction.Snap = function(opt_options) {
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goog.base(this, {
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handleEvent: ol.interaction.Snap.handleEvent_,
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handleDownEvent: goog.functions.TRUE,
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handleUpEvent: ol.interaction.Snap.handleUpEvent_
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});
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var options = goog.isDef(opt_options) ? opt_options : {};
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/**
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* @type {ol.source.Vector}
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* @private
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*/
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this.source_ = goog.isDef(options.source) ? options.source : null;
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/**
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* @type {ol.Collection.<ol.Feature>}
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* @private
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*/
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this.features_ = goog.isDef(options.features) ? options.features : null;
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/**
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* @type {Array.<goog.events.Key>}
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* @private
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*/
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this.featuresListenerKeys_ = [];
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/**
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* @type {Object.<number, goog.events.Key>}
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* @private
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*/
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this.geometryChangeListenerKeys_ = {};
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/**
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* @type {Object.<number, goog.events.Key>}
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* @private
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*/
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this.geometryModifyListenerKeys_ = {};
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/**
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* Extents are preserved so indexed segment can be quickly removed
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* when its feature geometry changes
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* @type {Object.<number, ol.Extent>}
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* @private
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*/
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this.indexedFeaturesExtents_ = {};
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/**
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* If a feature geometry changes while a pointer drag|move event occurs, the
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* feature doesn't get updated right away. It will be at the next 'pointerup'
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* event fired.
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* @type {Object.<number, ol.Feature>}
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* @private
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*/
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this.pendingFeatures_ = {};
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/**
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* Used for distance sorting in sortByDistance_
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* @type {ol.Coordinate}
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* @private
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*/
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this.pixelCoordinate_ = null;
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/**
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* @type {number}
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* @private
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*/
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this.pixelTolerance_ = goog.isDef(options.pixelTolerance) ?
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options.pixelTolerance : 10;
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/**
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* @type {function(ol.interaction.Snap.SegmentDataType, ol.interaction.Snap.SegmentDataType): number}
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* @private
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*/
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this.sortByDistance_ = goog.bind(ol.interaction.Snap.sortByDistance, this);
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/**
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* Segment RTree for each layer
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* @type {ol.structs.RBush.<ol.interaction.Snap.SegmentDataType>}
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* @private
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*/
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this.rBush_ = new ol.structs.RBush();
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/**
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* @const
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* @private
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* @type {Object.<string, function(ol.Feature, ol.geom.Geometry)> }
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*/
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this.SEGMENT_WRITERS_ = {
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'Point': this.writePointGeometry_,
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'LineString': this.writeLineStringGeometry_,
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'LinearRing': this.writeLineStringGeometry_,
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'Polygon': this.writePolygonGeometry_,
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'MultiPoint': this.writeMultiPointGeometry_,
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'MultiLineString': this.writeMultiLineStringGeometry_,
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'MultiPolygon': this.writeMultiPolygonGeometry_,
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'GeometryCollection': this.writeGeometryCollectionGeometry_
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};
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};
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goog.inherits(ol.interaction.Snap, ol.interaction.Pointer);
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/**
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* Add a feature to the collection of features that we may snap to.
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* @param {ol.Feature} feature Feature.
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* @param {boolean=} opt_listen Whether to listen to the geometry change or not
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* Defaults to `true`.
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* @api
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*/
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ol.interaction.Snap.prototype.addFeature = function(feature, opt_listen) {
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var listen = goog.isDef(opt_listen) ? opt_listen : true;
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var geometry = feature.getGeometry();
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var segmentWriter = this.SEGMENT_WRITERS_[geometry.getType()];
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if (goog.isDef(segmentWriter)) {
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var feature_uid = goog.getUid(feature);
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this.indexedFeaturesExtents_[feature_uid] = geometry.getExtent(
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ol.extent.createEmpty());
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segmentWriter.call(this, feature, geometry);
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if (listen) {
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this.geometryModifyListenerKeys_[feature_uid] = geometry.on(
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goog.events.EventType.CHANGE,
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goog.bind(this.handleGeometryModify_, this, feature),
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this);
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this.geometryChangeListenerKeys_[feature_uid] = feature.on(
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ol.Object.getChangeEventType(feature.getGeometryName()),
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this.handleGeometryChange_, this);
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}
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}
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};
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/**
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* @param {ol.Feature} feature Feature.
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* @private
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*/
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ol.interaction.Snap.prototype.forEachFeatureAdd_ = function(feature) {
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this.addFeature(feature);
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};
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/**
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* @param {ol.Feature} feature Feature.
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* @private
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*/
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ol.interaction.Snap.prototype.forEachFeatureRemove_ = function(feature) {
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this.removeFeature(feature);
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};
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/**
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* @return {ol.Collection.<ol.Feature>|Array.<ol.Feature>}
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* @private
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*/
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ol.interaction.Snap.prototype.getFeatures_ = function() {
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var features;
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if (!goog.isNull(this.features_)) {
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features = this.features_;
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} else if (!goog.isNull(this.source_)) {
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features = this.source_.getFeatures();
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}
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goog.asserts.assert(goog.isDef(features), 'features should be defined');
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return features;
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};
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/**
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* @param {ol.source.VectorEvent|ol.CollectionEvent} evt Event.
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* @private
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*/
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ol.interaction.Snap.prototype.handleFeatureAdd_ = function(evt) {
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var feature;
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if (evt instanceof ol.source.VectorEvent) {
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feature = evt.feature;
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} else if (evt instanceof ol.CollectionEvent) {
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feature = evt.element;
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}
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goog.asserts.assertInstanceof(feature, ol.Feature,
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'feature should be an ol.Feature');
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this.addFeature(feature);
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};
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/**
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* @param {ol.source.VectorEvent|ol.CollectionEvent} evt Event.
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* @private
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*/
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ol.interaction.Snap.prototype.handleFeatureRemove_ = function(evt) {
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var feature;
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if (evt instanceof ol.source.VectorEvent) {
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feature = evt.feature;
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} else if (evt instanceof ol.CollectionEvent) {
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feature = evt.element;
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}
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goog.asserts.assertInstanceof(feature, ol.Feature,
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'feature should be an ol.Feature');
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this.removeFeature(feature);
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};
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/**
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* @param {goog.events.Event} evt Event.
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* @private
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*/
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ol.interaction.Snap.prototype.handleGeometryChange_ = function(evt) {
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var feature = evt.currentTarget;
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goog.asserts.assertInstanceof(feature, ol.Feature);
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this.removeFeature(feature, true);
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this.addFeature(feature, true);
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};
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/**
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* @param {ol.Feature} feature Feature which geometry was modified.
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* @param {goog.events.Event} evt Event.
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* @private
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*/
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ol.interaction.Snap.prototype.handleGeometryModify_ = function(feature, evt) {
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if (this.handlingDownUpSequence) {
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var uid = goog.getUid(feature);
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if (!(uid in this.pendingFeatures_)) {
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this.pendingFeatures_[uid] = feature;
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}
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} else {
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this.updateFeature_(feature);
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}
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};
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/**
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* Remove a feature from the collection of features that we may snap to.
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* @param {ol.Feature} feature Feature
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* @param {boolean=} opt_unlisten Whether to unlisten to the geometry change
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* or not. Defaults to `true`.
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* @api
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*/
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ol.interaction.Snap.prototype.removeFeature = function(feature, opt_unlisten) {
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var unlisten = goog.isDef(opt_unlisten) ? opt_unlisten : true;
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var feature_uid = goog.getUid(feature);
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var extent = this.indexedFeaturesExtents_[feature_uid];
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if (extent) {
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var rBush = this.rBush_;
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var i, nodesToRemove = [];
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rBush.forEachInExtent(extent, function(node) {
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if (feature === node.feature) {
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nodesToRemove.push(node);
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}
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});
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for (i = nodesToRemove.length - 1; i >= 0; --i) {
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rBush.remove(nodesToRemove[i]);
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}
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if (unlisten) {
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ol.Observable.unByKey(this.geometryModifyListenerKeys_[feature_uid]);
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delete this.geometryModifyListenerKeys_[feature_uid];
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ol.Observable.unByKey(this.geometryChangeListenerKeys_[feature_uid]);
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delete this.geometryChangeListenerKeys_[feature_uid];
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}
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}
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};
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/**
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* @inheritDoc
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*/
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ol.interaction.Snap.prototype.setMap = function(map) {
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var currentMap = this.getMap();
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var keys = this.featuresListenerKeys_;
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var features = this.getFeatures_();
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if (currentMap) {
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goog.array.forEach(keys, ol.Observable.unByKey);
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keys.length = 0;
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features.forEach(this.forEachFeatureRemove_, this);
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}
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goog.base(this, 'setMap', map);
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if (map) {
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if (!goog.isNull(this.features_)) {
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keys.push(this.features_.on(ol.CollectionEventType.ADD,
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this.handleFeatureAdd_, this));
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keys.push(this.features_.on(ol.CollectionEventType.REMOVE,
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this.handleFeatureRemove_, this));
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} else if (!goog.isNull(this.source_)) {
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keys.push(this.source_.on(ol.source.VectorEventType.ADDFEATURE,
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this.handleFeatureAdd_, this));
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keys.push(this.source_.on(ol.source.VectorEventType.REMOVEFEATURE,
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this.handleFeatureRemove_, this));
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}
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features.forEach(this.forEachFeatureAdd_, this);
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}
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};
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/**
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* @inheritDoc
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*/
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ol.interaction.Snap.prototype.shouldStopEvent = goog.functions.FALSE;
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/**
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* @param {ol.Pixel} pixel Pixel
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* @param {ol.Coordinate} pixelCoordinate Coordinate
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* @param {ol.Map} map Map.
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* @return {ol.interaction.Snap.ResultType} Snap result
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*/
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ol.interaction.Snap.prototype.snapTo = function(pixel, pixelCoordinate, map) {
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var lowerLeft = map.getCoordinateFromPixel(
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[pixel[0] - this.pixelTolerance_, pixel[1] + this.pixelTolerance_]);
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var upperRight = map.getCoordinateFromPixel(
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[pixel[0] + this.pixelTolerance_, pixel[1] - this.pixelTolerance_]);
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var box = ol.extent.boundingExtent([lowerLeft, upperRight]);
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var segments = this.rBush_.getInExtent(box);
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var snappedToVertex = false;
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var snapped = false;
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var vertex = null;
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var vertexPixel = null;
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if (segments.length > 0) {
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this.pixelCoordinate_ = pixelCoordinate;
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segments.sort(this.sortByDistance_);
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var closestSegment = segments[0].segment;
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vertex = (ol.coordinate.closestOnSegment(pixelCoordinate,
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closestSegment));
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vertexPixel = map.getPixelFromCoordinate(vertex);
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if (Math.sqrt(ol.coordinate.squaredDistance(pixel, vertexPixel)) <=
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this.pixelTolerance_) {
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snapped = true;
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var pixel1 = map.getPixelFromCoordinate(closestSegment[0]);
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var pixel2 = map.getPixelFromCoordinate(closestSegment[1]);
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var squaredDist1 = ol.coordinate.squaredDistance(vertexPixel, pixel1);
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var squaredDist2 = ol.coordinate.squaredDistance(vertexPixel, pixel2);
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var dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));
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snappedToVertex = dist <= this.pixelTolerance_;
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if (snappedToVertex) {
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vertex = squaredDist1 > squaredDist2 ?
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closestSegment[1] : closestSegment[0];
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vertexPixel = map.getPixelFromCoordinate(vertex);
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vertexPixel = [Math.round(vertexPixel[0]), Math.round(vertexPixel[1])];
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}
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}
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}
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return /** @type {ol.interaction.Snap.ResultType} */ ({
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snapped: snapped,
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vertex: vertex,
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vertexPixel: vertexPixel
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});
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};
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/**
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* @param {ol.Feature} feature Feature
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* @private
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*/
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ol.interaction.Snap.prototype.updateFeature_ = function(feature) {
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this.removeFeature(feature, false);
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this.addFeature(feature, false);
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};
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/**
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* @param {ol.Feature} feature Feature
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* @param {ol.geom.GeometryCollection} geometry Geometry.
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* @private
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*/
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ol.interaction.Snap.prototype.writeGeometryCollectionGeometry_ =
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function(feature, geometry) {
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var i, geometries = geometry.getGeometriesArray();
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for (i = 0; i < geometries.length; ++i) {
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this.SEGMENT_WRITERS_[geometries[i].getType()].call(
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this, feature, geometries[i]);
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}
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};
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/**
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* @param {ol.Feature} feature Feature
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* @param {ol.geom.LineString} geometry Geometry.
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* @private
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*/
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ol.interaction.Snap.prototype.writeLineStringGeometry_ =
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function(feature, geometry) {
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var coordinates = geometry.getCoordinates();
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var i, ii, segment, segmentData;
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for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
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segment = coordinates.slice(i, i + 2);
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segmentData = /** @type {ol.interaction.Snap.SegmentDataType} */ ({
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feature: feature,
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segment: segment
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});
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this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
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}
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};
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/**
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* @param {ol.Feature} feature Feature
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* @param {ol.geom.MultiLineString} geometry Geometry.
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* @private
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*/
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ol.interaction.Snap.prototype.writeMultiLineStringGeometry_ =
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function(feature, geometry) {
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var lines = geometry.getCoordinates();
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var coordinates, i, ii, j, jj, segment, segmentData;
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for (j = 0, jj = lines.length; j < jj; ++j) {
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coordinates = lines[j];
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for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
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segment = coordinates.slice(i, i + 2);
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segmentData = /** @type {ol.interaction.Snap.SegmentDataType} */ ({
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feature: feature,
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segment: segment
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});
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this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
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}
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}
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};
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/**
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* @param {ol.Feature} feature Feature
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* @param {ol.geom.MultiPoint} geometry Geometry.
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* @private
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*/
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ol.interaction.Snap.prototype.writeMultiPointGeometry_ =
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function(feature, geometry) {
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var points = geometry.getCoordinates();
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var coordinates, i, ii, segmentData;
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for (i = 0, ii = points.length; i < ii; ++i) {
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coordinates = points[i];
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segmentData = /** @type {ol.interaction.Snap.SegmentDataType} */ ({
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feature: feature,
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segment: [coordinates, coordinates]
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});
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this.rBush_.insert(geometry.getExtent(), segmentData);
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}
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};
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/**
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* @param {ol.Feature} feature Feature
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* @param {ol.geom.MultiPolygon} geometry Geometry.
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* @private
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*/
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ol.interaction.Snap.prototype.writeMultiPolygonGeometry_ =
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function(feature, geometry) {
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var polygons = geometry.getCoordinates();
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var coordinates, i, ii, j, jj, k, kk, rings, segment, segmentData;
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for (k = 0, kk = polygons.length; k < kk; ++k) {
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rings = polygons[k];
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for (j = 0, jj = rings.length; j < jj; ++j) {
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coordinates = rings[j];
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for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
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segment = coordinates.slice(i, i + 2);
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segmentData = /** @type {ol.interaction.Snap.SegmentDataType} */ ({
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feature: feature,
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segment: segment
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});
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this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
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}
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}
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}
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};
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/**
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* @param {ol.Feature} feature Feature
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* @param {ol.geom.Point} geometry Geometry.
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* @private
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*/
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ol.interaction.Snap.prototype.writePointGeometry_ =
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function(feature, geometry) {
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var coordinates = geometry.getCoordinates();
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var segmentData = /** @type {ol.interaction.Snap.SegmentDataType} */ ({
|
|
feature: feature,
|
|
segment: [coordinates, coordinates]
|
|
});
|
|
this.rBush_.insert(geometry.getExtent(), segmentData);
|
|
};
|
|
|
|
|
|
/**
|
|
* @param {ol.Feature} feature Feature
|
|
* @param {ol.geom.Polygon} geometry Geometry.
|
|
* @private
|
|
*/
|
|
ol.interaction.Snap.prototype.writePolygonGeometry_ =
|
|
function(feature, geometry) {
|
|
var rings = geometry.getCoordinates();
|
|
var coordinates, i, ii, j, jj, segment, segmentData;
|
|
for (j = 0, jj = rings.length; j < jj; ++j) {
|
|
coordinates = rings[j];
|
|
for (i = 0, ii = coordinates.length - 1; i < ii; ++i) {
|
|
segment = coordinates.slice(i, i + 2);
|
|
segmentData = /** @type {ol.interaction.Snap.SegmentDataType} */ ({
|
|
feature: feature,
|
|
segment: segment
|
|
});
|
|
this.rBush_.insert(ol.extent.boundingExtent(segment), segmentData);
|
|
}
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* @typedef {{
|
|
* snapped: {boolean},
|
|
* vertex: (ol.Coordinate|null),
|
|
* vertexPixel: (ol.Pixel|null)
|
|
* }}
|
|
*/
|
|
ol.interaction.Snap.ResultType;
|
|
|
|
|
|
/**
|
|
* @typedef {{
|
|
* feature: ol.Feature,
|
|
* segment: Array.<ol.Coordinate>
|
|
* }}
|
|
*/
|
|
ol.interaction.Snap.SegmentDataType;
|
|
|
|
|
|
/**
|
|
* Handle all pointer events events.
|
|
* @param {ol.MapBrowserEvent} evt A move event.
|
|
* @return {boolean} Pass the event to other interactions.
|
|
* @this {ol.interaction.Snap}
|
|
* @private
|
|
*/
|
|
ol.interaction.Snap.handleEvent_ = function(evt) {
|
|
var result = this.snapTo(evt.pixel, evt.coordinate, evt.map);
|
|
if (result.snapped) {
|
|
evt.coordinate = result.vertex.slice(0, 2);
|
|
evt.pixel = result.vertexPixel;
|
|
}
|
|
return ol.interaction.Pointer.handleEvent.call(this, evt);
|
|
};
|
|
|
|
|
|
/**
|
|
* @param {ol.MapBrowserPointerEvent} evt Event.
|
|
* @return {boolean} Stop drag sequence?
|
|
* @this {ol.interaction.Snap}
|
|
* @private
|
|
*/
|
|
ol.interaction.Snap.handleUpEvent_ = function(evt) {
|
|
var featuresToUpdate = goog.object.getValues(this.pendingFeatures_);
|
|
if (featuresToUpdate.length) {
|
|
goog.array.forEach(featuresToUpdate, this.updateFeature_, this);
|
|
this.pendingFeatures_ = {};
|
|
}
|
|
return false;
|
|
};
|
|
|
|
|
|
/**
|
|
* Sort segments by distance, helper function
|
|
* @param {ol.interaction.Snap.SegmentDataType} a
|
|
* @param {ol.interaction.Snap.SegmentDataType} b
|
|
* @return {number}
|
|
* @this {ol.interaction.Snap}
|
|
*/
|
|
ol.interaction.Snap.sortByDistance = function(a, b) {
|
|
return ol.coordinate.squaredDistanceToSegment(
|
|
this.pixelCoordinate_, a.segment) -
|
|
ol.coordinate.squaredDistanceToSegment(
|
|
this.pixelCoordinate_, b.segment);
|
|
};
|