630 lines
20 KiB
JavaScript
630 lines
20 KiB
JavaScript
/**
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* @module ol/interaction/Snap
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*/
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import {getUid} from '../util.js';
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import CollectionEventType from '../CollectionEventType.js';
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import {distance as coordinateDistance, squaredDistance as squaredCoordinateDistance, closestOnCircle, closestOnSegment, squaredDistanceToSegment} from '../coordinate.js';
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import {listen, unlistenByKey} from '../events.js';
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import EventType from '../events/EventType.js';
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import {boundingExtent, createEmpty} from '../extent.js';
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import {TRUE, FALSE} from '../functions.js';
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import GeometryType from '../geom/GeometryType.js';
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import {fromCircle} from '../geom/Polygon.js';
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import PointerInteraction from './Pointer.js';
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import {getValues} from '../obj.js';
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import VectorEventType from '../source/VectorEventType.js';
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import RBush from '../structs/RBush.js';
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/**
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* @typedef {Object} Result
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* @property {boolean} snapped
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* @property {import("../coordinate.js").Coordinate|null} vertex
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* @property {import("../pixel.js").Pixel|null} vertexPixel
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*/
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/**
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* @typedef {Object} SegmentData
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* @property {import("../Feature.js").default} feature
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* @property {Array<import("../coordinate.js").Coordinate>} segment
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*/
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/**
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* @typedef {Object} Options
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* @property {import("../Collection.js").default<import("../Feature.js").default>} [features] Snap to these features. Either this option or source should be provided.
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* @property {boolean} [edge=true] Snap to edges.
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* @property {boolean} [vertex=true] Snap to vertices.
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* @property {number} [pixelTolerance=10] Pixel tolerance for considering the pointer close enough to a segment or
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* vertex for snapping.
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* @property {import("../source/Vector.js").default} [source] Snap to features from this source. Either this option or features should be provided
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*/
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/**
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* @param {import("../source/Vector.js").VectorSourceEvent|import("../Collection.js").CollectionEvent} evt Event.
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* @return {import("../Feature.js").default} Feature.
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*/
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function getFeatureFromEvent(evt) {
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if (/** @type {import("../source/Vector.js").VectorSourceEvent} */ (evt).feature) {
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return /** @type {import("../source/Vector.js").VectorSourceEvent} */ (evt).feature;
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} else if (/** @type {import("../Collection.js").CollectionEvent} */ (evt).element) {
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return /** @type {import("../Feature.js").default} */ (/** @type {import("../Collection.js").CollectionEvent} */ (evt).element);
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}
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}
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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 module:ol/source/Vector} or {@link module:ol/Collection~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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* import Snap from 'ol/interaction/Snap';
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*
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* var snap = new Snap({
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* source: source
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* });
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*
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* @api
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*/
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class Snap extends PointerInteraction {
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/**
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* @param {Options=} opt_options Options.
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*/
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constructor(opt_options) {
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const options = opt_options ? opt_options : {};
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const pointerOptions = /** @type {import("./Pointer.js").Options} */ (options);
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if (!pointerOptions.handleDownEvent) {
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pointerOptions.handleDownEvent = TRUE;
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}
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if (!pointerOptions.stopDown) {
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pointerOptions.stopDown = FALSE;
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}
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super(pointerOptions);
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/**
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* @type {import("../source/Vector.js").default}
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* @private
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*/
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this.source_ = options.source ? options.source : null;
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/**
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* @private
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* @type {boolean}
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*/
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this.vertex_ = options.vertex !== undefined ? options.vertex : true;
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/**
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* @private
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* @type {boolean}
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*/
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this.edge_ = options.edge !== undefined ? options.edge : true;
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/**
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* @type {import("../Collection.js").default<import("../Feature.js").default>}
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* @private
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*/
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this.features_ = options.features ? options.features : null;
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/**
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* @type {Array<import("../events.js").EventsKey>}
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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<string, import("../events.js").EventsKey>}
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* @private
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*/
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this.featureChangeListenerKeys_ = {};
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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<string, import("../extent.js").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<string, import("../Feature.js").default>}
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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 {import("../coordinate.js").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_ = options.pixelTolerance !== undefined ?
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options.pixelTolerance : 10;
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/**
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* @type {function(SegmentData, SegmentData): number}
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* @private
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*/
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this.sortByDistance_ = sortByDistance.bind(this);
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/**
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* Segment RTree for each layer
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* @type {import("../structs/RBush.js").default<SegmentData>}
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* @private
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*/
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this.rBush_ = new RBush();
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/**
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* @const
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* @private
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* @type {Object<string, function(import("../Feature.js").default, import("../geom/Geometry.js").default): void>}
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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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'Circle': this.writeCircleGeometry_
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};
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}
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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 {import("../Feature.js").default} feature Feature.
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* @param {boolean=} opt_listen Whether to listen to the feature change or not
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* Defaults to `true`.
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* @api
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*/
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addFeature(feature, opt_listen) {
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const register = opt_listen !== undefined ? opt_listen : true;
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const feature_uid = getUid(feature);
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const geometry = feature.getGeometry();
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if (geometry) {
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const segmentWriter = this.SEGMENT_WRITERS_[geometry.getType()];
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if (segmentWriter) {
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this.indexedFeaturesExtents_[feature_uid] = geometry.getExtent(createEmpty());
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segmentWriter.call(this, feature, geometry);
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}
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}
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if (register) {
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this.featureChangeListenerKeys_[feature_uid] = listen(
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feature,
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EventType.CHANGE,
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this.handleFeatureChange_, this);
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}
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}
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/**
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* @param {import("../Feature.js").default} feature Feature.
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* @private
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*/
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forEachFeatureAdd_(feature) {
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this.addFeature(feature);
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}
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/**
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* @param {import("../Feature.js").default} feature Feature.
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* @private
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*/
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forEachFeatureRemove_(feature) {
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this.removeFeature(feature);
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}
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/**
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* @return {import("../Collection.js").default<import("../Feature.js").default>|Array<import("../Feature.js").default>} Features.
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* @private
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*/
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getFeatures_() {
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let features;
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if (this.features_) {
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features = this.features_;
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} else if (this.source_) {
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features = this.source_.getFeatures();
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}
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return features;
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}
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/**
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* @inheritDoc
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*/
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handleEvent(evt) {
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const result = this.snapTo(evt.pixel, evt.coordinate, evt.map);
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if (result.snapped) {
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evt.coordinate = result.vertex.slice(0, 2);
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evt.pixel = result.vertexPixel;
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}
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return super.handleEvent(evt);
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}
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/**
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* @param {import("../source/Vector.js").VectorSourceEvent|import("../Collection.js").CollectionEvent} evt Event.
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* @private
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*/
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handleFeatureAdd_(evt) {
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const feature = getFeatureFromEvent(evt);
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this.addFeature(feature);
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}
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/**
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* @param {import("../source/Vector.js").VectorSourceEvent|import("../Collection.js").CollectionEvent} evt Event.
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* @private
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*/
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handleFeatureRemove_(evt) {
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const feature = getFeatureFromEvent(evt);
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this.removeFeature(feature);
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}
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/**
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* @param {import("../events/Event.js").default} evt Event.
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* @private
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*/
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handleFeatureChange_(evt) {
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const feature = /** @type {import("../Feature.js").default} */ (evt.target);
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if (this.handlingDownUpSequence) {
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const uid = 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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* @inheritDoc
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*/
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handleUpEvent(evt) {
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const featuresToUpdate = getValues(this.pendingFeatures_);
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if (featuresToUpdate.length) {
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featuresToUpdate.forEach(this.updateFeature_.bind(this));
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this.pendingFeatures_ = {};
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}
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return false;
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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 {import("../Feature.js").default} feature Feature
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* @param {boolean=} opt_unlisten Whether to unlisten to the feature change
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* or not. Defaults to `true`.
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* @api
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*/
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removeFeature(feature, opt_unlisten) {
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const unregister = opt_unlisten !== undefined ? opt_unlisten : true;
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const feature_uid = getUid(feature);
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const extent = this.indexedFeaturesExtents_[feature_uid];
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if (extent) {
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const rBush = this.rBush_;
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const 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 (let i = nodesToRemove.length - 1; i >= 0; --i) {
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rBush.remove(nodesToRemove[i]);
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}
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}
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if (unregister) {
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unlistenByKey(this.featureChangeListenerKeys_[feature_uid]);
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delete this.featureChangeListenerKeys_[feature_uid];
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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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setMap(map) {
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const currentMap = this.getMap();
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const keys = this.featuresListenerKeys_;
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const features = /** @type {Array<import("../Feature.js").default>} */ (this.getFeatures_());
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if (currentMap) {
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keys.forEach(unlistenByKey);
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keys.length = 0;
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features.forEach(this.forEachFeatureRemove_.bind(this));
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}
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super.setMap(map);
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if (map) {
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if (this.features_) {
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keys.push(
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listen(this.features_, CollectionEventType.ADD,
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this.handleFeatureAdd_, this),
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listen(this.features_, CollectionEventType.REMOVE,
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this.handleFeatureRemove_, this)
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);
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} else if (this.source_) {
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keys.push(
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listen(this.source_, VectorEventType.ADDFEATURE,
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this.handleFeatureAdd_, this),
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listen(this.source_, VectorEventType.REMOVEFEATURE,
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this.handleFeatureRemove_, this)
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);
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}
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features.forEach(this.forEachFeatureAdd_.bind(this));
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}
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}
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/**
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* @param {import("../pixel.js").Pixel} pixel Pixel
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* @param {import("../coordinate.js").Coordinate} pixelCoordinate Coordinate
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* @param {import("../PluggableMap.js").default} map Map.
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* @return {Result} Snap result
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*/
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snapTo(pixel, pixelCoordinate, map) {
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const lowerLeft = map.getCoordinateFromPixel(
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[pixel[0] - this.pixelTolerance_, pixel[1] + this.pixelTolerance_]);
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const upperRight = map.getCoordinateFromPixel(
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[pixel[0] + this.pixelTolerance_, pixel[1] - this.pixelTolerance_]);
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const box = boundingExtent([lowerLeft, upperRight]);
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let segments = this.rBush_.getInExtent(box);
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// If snapping on vertices only, don't consider circles
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if (this.vertex_ && !this.edge_) {
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segments = segments.filter(function(segment) {
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return segment.feature.getGeometry().getType() !==
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GeometryType.CIRCLE;
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});
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}
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let snappedToVertex = false;
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let snapped = false;
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let vertex = null;
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let vertexPixel = null;
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let dist, pixel1, pixel2, squaredDist1, squaredDist2;
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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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const closestSegment = segments[0].segment;
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const isCircle = segments[0].feature.getGeometry().getType() ===
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GeometryType.CIRCLE;
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if (this.vertex_ && !this.edge_) {
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pixel1 = map.getPixelFromCoordinate(closestSegment[0]);
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pixel2 = map.getPixelFromCoordinate(closestSegment[1]);
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squaredDist1 = squaredCoordinateDistance(pixel, pixel1);
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squaredDist2 = squaredCoordinateDistance(pixel, pixel2);
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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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snapped = true;
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vertex = squaredDist1 > squaredDist2 ? closestSegment[1] : closestSegment[0];
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vertexPixel = map.getPixelFromCoordinate(vertex);
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}
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} else if (this.edge_) {
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if (isCircle) {
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vertex = closestOnCircle(pixelCoordinate,
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/** @type {import("../geom/Circle.js").default} */ (segments[0].feature.getGeometry()));
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} else {
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vertex = closestOnSegment(pixelCoordinate, closestSegment);
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}
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vertexPixel = map.getPixelFromCoordinate(vertex);
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if (coordinateDistance(pixel, vertexPixel) <= this.pixelTolerance_) {
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snapped = true;
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if (this.vertex_ && !isCircle) {
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pixel1 = map.getPixelFromCoordinate(closestSegment[0]);
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pixel2 = map.getPixelFromCoordinate(closestSegment[1]);
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squaredDist1 = squaredCoordinateDistance(vertexPixel, pixel1);
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squaredDist2 = squaredCoordinateDistance(vertexPixel, pixel2);
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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 ? closestSegment[1] : closestSegment[0];
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vertexPixel = map.getPixelFromCoordinate(vertex);
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}
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}
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}
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}
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if (snapped) {
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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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return {
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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 {import("../Feature.js").default} feature Feature
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* @private
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*/
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updateFeature_(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 {import("../Feature.js").default} feature Feature
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* @param {import("../geom/Circle.js").default} geometry Geometry.
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* @private
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*/
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writeCircleGeometry_(feature, geometry) {
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const polygon = fromCircle(geometry);
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const coordinates = polygon.getCoordinates()[0];
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for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {
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const segment = coordinates.slice(i, i + 2);
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const segmentData = {
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feature: feature,
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segment: segment
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};
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this.rBush_.insert(boundingExtent(segment), segmentData);
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}
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}
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/**
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* @param {import("../Feature.js").default} feature Feature
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* @param {import("../geom/GeometryCollection.js").default} geometry Geometry.
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* @private
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*/
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writeGeometryCollectionGeometry_(feature, geometry) {
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const geometries = geometry.getGeometriesArray();
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for (let i = 0; i < geometries.length; ++i) {
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const segmentWriter = this.SEGMENT_WRITERS_[geometries[i].getType()];
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if (segmentWriter) {
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segmentWriter.call(this, feature, geometries[i]);
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}
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}
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}
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/**
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* @param {import("../Feature.js").default} feature Feature
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* @param {import("../geom/LineString.js").default} geometry Geometry.
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* @private
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*/
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writeLineStringGeometry_(feature, geometry) {
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const coordinates = geometry.getCoordinates();
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for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {
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const segment = coordinates.slice(i, i + 2);
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const segmentData = {
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feature: feature,
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segment: segment
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};
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this.rBush_.insert(boundingExtent(segment), segmentData);
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}
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}
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/**
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* @param {import("../Feature.js").default} feature Feature
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* @param {import("../geom/MultiLineString.js").default} geometry Geometry.
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* @private
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*/
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writeMultiLineStringGeometry_(feature, geometry) {
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const lines = geometry.getCoordinates();
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for (let j = 0, jj = lines.length; j < jj; ++j) {
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const coordinates = lines[j];
|
|
for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {
|
|
const segment = coordinates.slice(i, i + 2);
|
|
const segmentData = {
|
|
feature: feature,
|
|
segment: segment
|
|
};
|
|
this.rBush_.insert(boundingExtent(segment), segmentData);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {import("../Feature.js").default} feature Feature
|
|
* @param {import("../geom/MultiPoint.js").default} geometry Geometry.
|
|
* @private
|
|
*/
|
|
writeMultiPointGeometry_(feature, geometry) {
|
|
const points = geometry.getCoordinates();
|
|
for (let i = 0, ii = points.length; i < ii; ++i) {
|
|
const coordinates = points[i];
|
|
const segmentData = {
|
|
feature: feature,
|
|
segment: [coordinates, coordinates]
|
|
};
|
|
this.rBush_.insert(geometry.getExtent(), segmentData);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {import("../Feature.js").default} feature Feature
|
|
* @param {import("../geom/MultiPolygon.js").default} geometry Geometry.
|
|
* @private
|
|
*/
|
|
writeMultiPolygonGeometry_(feature, geometry) {
|
|
const polygons = geometry.getCoordinates();
|
|
for (let k = 0, kk = polygons.length; k < kk; ++k) {
|
|
const rings = polygons[k];
|
|
for (let j = 0, jj = rings.length; j < jj; ++j) {
|
|
const coordinates = rings[j];
|
|
for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {
|
|
const segment = coordinates.slice(i, i + 2);
|
|
const segmentData = {
|
|
feature: feature,
|
|
segment: segment
|
|
};
|
|
this.rBush_.insert(boundingExtent(segment), segmentData);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {import("../Feature.js").default} feature Feature
|
|
* @param {import("../geom/Point.js").default} geometry Geometry.
|
|
* @private
|
|
*/
|
|
writePointGeometry_(feature, geometry) {
|
|
const coordinates = geometry.getCoordinates();
|
|
const segmentData = {
|
|
feature: feature,
|
|
segment: [coordinates, coordinates]
|
|
};
|
|
this.rBush_.insert(geometry.getExtent(), segmentData);
|
|
}
|
|
|
|
/**
|
|
* @param {import("../Feature.js").default} feature Feature
|
|
* @param {import("../geom/Polygon.js").default} geometry Geometry.
|
|
* @private
|
|
*/
|
|
writePolygonGeometry_(feature, geometry) {
|
|
const rings = geometry.getCoordinates();
|
|
for (let j = 0, jj = rings.length; j < jj; ++j) {
|
|
const coordinates = rings[j];
|
|
for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {
|
|
const segment = coordinates.slice(i, i + 2);
|
|
const segmentData = {
|
|
feature: feature,
|
|
segment: segment
|
|
};
|
|
this.rBush_.insert(boundingExtent(segment), segmentData);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Sort segments by distance, helper function
|
|
* @param {SegmentData} a The first segment data.
|
|
* @param {SegmentData} b The second segment data.
|
|
* @return {number} The difference in distance.
|
|
* @this {Snap}
|
|
*/
|
|
function sortByDistance(a, b) {
|
|
const deltaA = squaredDistanceToSegment(this.pixelCoordinate_, a.segment);
|
|
const deltaB = squaredDistanceToSegment(this.pixelCoordinate_, b.segment);
|
|
return deltaA - deltaB;
|
|
}
|
|
|
|
export default Snap;
|