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669 lines
20 KiB
669 lines
20 KiB
/**
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* @module ol/interaction/Snap
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*/
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import CollectionEventType from '../CollectionEventType.js';
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import EventType from '../events/EventType.js';
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import PointerInteraction from './Pointer.js';
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import RBush from '../structs/RBush.js';
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import VectorEventType from '../source/VectorEventType.js';
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import {FALSE, TRUE} from '../functions.js';
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import {boundingExtent, createEmpty} from '../extent.js';
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import {
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closestOnCircle,
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closestOnSegment,
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squaredDistance,
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} from '../coordinate.js';
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import {fromCircle} from '../geom/Polygon.js';
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import {
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fromUserCoordinate,
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getUserProjection,
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toUserCoordinate,
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} from '../proj.js';
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import {getUid} from '../util.js';
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import {listen, unlistenByKey} from '../events.js';
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/**
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* @typedef {Object} Result
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* @property {import("../coordinate.js").Coordinate|null} vertex Vertex.
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* @property {import("../pixel.js").Pixel|null} vertexPixel 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 Feature.
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* @property {Array<import("../coordinate.js").Coordinate>} segment 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<import("../Feature.js").default>} 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 (
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/** @type {import("../source/Vector.js").VectorSourceEvent} */ (evt).feature
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) {
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return /** @type {import("../source/Vector.js").VectorSourceEvent} */ (evt)
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.feature;
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} else if (
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/** @type {import("../Collection.js").CollectionEvent<import("../Feature.js").default>} */ (
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evt
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).element
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) {
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return /** @type {import("../Collection.js").CollectionEvent<import("../Feature.js").default>} */ (
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evt
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).element;
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}
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}
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const tempSegment = [];
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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~VectorSource} 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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* const snap = new Snap({
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* source: source
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* });
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*
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* map.addInteraction(snap);
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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} [options] Options.
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*/
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constructor(options) {
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options = options ? options : {};
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const pointerOptions = /** @type {import("./Pointer.js").Options} */ (
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options
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);
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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|null}
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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>|null}
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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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* @type {number}
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* @private
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*/
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this.pixelTolerance_ =
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options.pixelTolerance !== undefined ? options.pixelTolerance : 10;
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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(Array<Array<import('../coordinate.js').Coordinate>>, import("../geom/Geometry.js").default): void>}
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*/
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this.GEOMETRY_SEGMENTERS_ = {
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'Point': this.segmentPointGeometry_.bind(this),
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'LineString': this.segmentLineStringGeometry_.bind(this),
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'LinearRing': this.segmentLineStringGeometry_.bind(this),
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'Polygon': this.segmentPolygonGeometry_.bind(this),
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'MultiPoint': this.segmentMultiPointGeometry_.bind(this),
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'MultiLineString': this.segmentMultiLineStringGeometry_.bind(this),
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'MultiPolygon': this.segmentMultiPolygonGeometry_.bind(this),
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'GeometryCollection': this.segmentGeometryCollectionGeometry_.bind(this),
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'Circle': this.segmentCircleGeometry_.bind(this),
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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} [register] 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, register) {
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register = register !== undefined ? register : 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 segmenter = this.GEOMETRY_SEGMENTERS_[geometry.getType()];
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if (segmenter) {
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this.indexedFeaturesExtents_[feature_uid] = geometry.getExtent(
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createEmpty()
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);
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const segments =
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/** @type {Array<Array<import('../coordinate.js').Coordinate>>} */ ([]);
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segmenter(segments, geometry);
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if (segments.length === 1) {
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this.rBush_.insert(boundingExtent(segments[0]), {
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feature: feature,
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segment: segments[0],
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});
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} else if (segments.length > 1) {
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const extents = segments.map((s) => boundingExtent(s));
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const segmentsData = segments.map((segment) => ({
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feature: feature,
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segment: segment,
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}));
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this.rBush_.load(extents, segmentsData);
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}
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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_,
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this
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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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* @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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/** @type {import("../Collection.js").default<import("../Feature.js").default>|Array<import("../Feature.js").default>} */
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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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* @param {import("../MapBrowserEvent.js").default} evt Map browser event.
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* @return {boolean} `false` to stop event propagation.
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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) {
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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<import("../Feature.js").default>} 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<import("../Feature.js").default>} 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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* Handle pointer up events.
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* @param {import("../MapBrowserEvent.js").default} evt Event.
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* @return {boolean} If the event was consumed.
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*/
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handleUpEvent(evt) {
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const featuresToUpdate = Object.values(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} [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, unlisten) {
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const unregister = unlisten !== undefined ? 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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* Remove the interaction from its current map and attach it to the new map.
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* Subclasses may set up event handlers to get notified about changes to
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* the map here.
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* @param {import("../Map.js").default} map Map.
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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>} */ (
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this.getFeatures_()
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);
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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(
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this.features_,
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CollectionEventType.ADD,
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this.handleFeatureAdd_,
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this
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),
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listen(
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this.features_,
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CollectionEventType.REMOVE,
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this.handleFeatureRemove_,
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this
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)
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);
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} else if (this.source_) {
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keys.push(
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listen(
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this.source_,
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VectorEventType.ADDFEATURE,
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this.handleFeatureAdd_,
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this
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),
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listen(
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this.source_,
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VectorEventType.REMOVEFEATURE,
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this.handleFeatureRemove_,
|
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this
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)
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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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* @param {import("../pixel.js").Pixel} pixel Pixel
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* @param {import("../coordinate.js").Coordinate} pixelCoordinate Coordinate
|
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* @param {import("../Map.js").default} map Map.
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* @return {Result|null} 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_,
|
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pixel[1] + this.pixelTolerance_,
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]);
|
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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]);
|
|
|
|
const segments = this.rBush_.getInExtent(box);
|
|
|
|
const segmentsLength = segments.length;
|
|
if (segmentsLength === 0) {
|
|
return null;
|
|
}
|
|
|
|
const projection = map.getView().getProjection();
|
|
const projectedCoordinate = fromUserCoordinate(pixelCoordinate, projection);
|
|
|
|
let closestVertex;
|
|
let minSquaredDistance = Infinity;
|
|
|
|
const squaredPixelTolerance = this.pixelTolerance_ * this.pixelTolerance_;
|
|
const getResult = () => {
|
|
if (closestVertex) {
|
|
const vertexPixel = map.getPixelFromCoordinate(closestVertex);
|
|
const squaredPixelDistance = squaredDistance(pixel, vertexPixel);
|
|
if (squaredPixelDistance <= squaredPixelTolerance) {
|
|
return {
|
|
vertex: closestVertex,
|
|
vertexPixel: [
|
|
Math.round(vertexPixel[0]),
|
|
Math.round(vertexPixel[1]),
|
|
],
|
|
};
|
|
}
|
|
}
|
|
return null;
|
|
};
|
|
|
|
if (this.vertex_) {
|
|
for (let i = 0; i < segmentsLength; ++i) {
|
|
const segmentData = segments[i];
|
|
if (segmentData.feature.getGeometry().getType() !== 'Circle') {
|
|
segmentData.segment.forEach((vertex) => {
|
|
const tempVertexCoord = fromUserCoordinate(vertex, projection);
|
|
const delta = squaredDistance(projectedCoordinate, tempVertexCoord);
|
|
if (delta < minSquaredDistance) {
|
|
closestVertex = vertex;
|
|
minSquaredDistance = delta;
|
|
}
|
|
});
|
|
}
|
|
}
|
|
const result = getResult();
|
|
if (result) {
|
|
return result;
|
|
}
|
|
}
|
|
|
|
if (this.edge_) {
|
|
for (let i = 0; i < segmentsLength; ++i) {
|
|
let vertex = null;
|
|
const segmentData = segments[i];
|
|
if (segmentData.feature.getGeometry().getType() === 'Circle') {
|
|
let circleGeometry = segmentData.feature.getGeometry();
|
|
const userProjection = getUserProjection();
|
|
if (userProjection) {
|
|
circleGeometry = circleGeometry
|
|
.clone()
|
|
.transform(userProjection, projection);
|
|
}
|
|
vertex = toUserCoordinate(
|
|
closestOnCircle(
|
|
projectedCoordinate,
|
|
/** @type {import("../geom/Circle.js").default} */ (
|
|
circleGeometry
|
|
)
|
|
),
|
|
projection
|
|
);
|
|
} else {
|
|
const [segmentStart, segmentEnd] = segmentData.segment;
|
|
// points have only one coordinate
|
|
if (segmentEnd) {
|
|
tempSegment[0] = fromUserCoordinate(segmentStart, projection);
|
|
tempSegment[1] = fromUserCoordinate(segmentEnd, projection);
|
|
vertex = closestOnSegment(projectedCoordinate, tempSegment);
|
|
}
|
|
}
|
|
if (vertex) {
|
|
const delta = squaredDistance(projectedCoordinate, vertex);
|
|
if (delta < minSquaredDistance) {
|
|
closestVertex = vertex;
|
|
minSquaredDistance = delta;
|
|
}
|
|
}
|
|
}
|
|
|
|
const result = getResult();
|
|
if (result) {
|
|
return result;
|
|
}
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* @param {import("../Feature.js").default} feature Feature
|
|
* @private
|
|
*/
|
|
updateFeature_(feature) {
|
|
this.removeFeature(feature, false);
|
|
this.addFeature(feature, false);
|
|
}
|
|
|
|
/**
|
|
* @param {Array<Array<import('../coordinate.js').Coordinate>>} segments Segments
|
|
* @param {import("../geom/Circle.js").default} geometry Geometry.
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* @private
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|
*/
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segmentCircleGeometry_(segments, geometry) {
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|
const projection = this.getMap().getView().getProjection();
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|
let circleGeometry = geometry;
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|
const userProjection = getUserProjection();
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|
if (userProjection) {
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|
circleGeometry = /** @type {import("../geom/Circle.js").default} */ (
|
|
circleGeometry.clone().transform(userProjection, projection)
|
|
);
|
|
}
|
|
const polygon = fromCircle(circleGeometry);
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|
if (userProjection) {
|
|
polygon.transform(projection, userProjection);
|
|
}
|
|
const coordinates = polygon.getCoordinates()[0];
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|
for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {
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|
segments.push(coordinates.slice(i, i + 2));
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|
}
|
|
}
|
|
|
|
/**
|
|
* @param {Array<Array<import('../coordinate.js').Coordinate>>} segments Segments
|
|
* @param {import("../geom/GeometryCollection.js").default} geometry Geometry.
|
|
* @private
|
|
*/
|
|
segmentGeometryCollectionGeometry_(segments, geometry) {
|
|
const geometries = geometry.getGeometriesArray();
|
|
for (let i = 0; i < geometries.length; ++i) {
|
|
const segmenter = this.GEOMETRY_SEGMENTERS_[geometries[i].getType()];
|
|
if (segmenter) {
|
|
segmenter(segments, geometries[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {Array<Array<import('../coordinate.js').Coordinate>>} segments Segments
|
|
* @param {import("../geom/LineString.js").default} geometry Geometry.
|
|
* @private
|
|
*/
|
|
segmentLineStringGeometry_(segments, geometry) {
|
|
const coordinates = geometry.getCoordinates();
|
|
for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {
|
|
segments.push(coordinates.slice(i, i + 2));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {Array<Array<import('../coordinate.js').Coordinate>>} segments Segments
|
|
* @param {import("../geom/MultiLineString.js").default} geometry Geometry.
|
|
* @private
|
|
*/
|
|
segmentMultiLineStringGeometry_(segments, geometry) {
|
|
const lines = geometry.getCoordinates();
|
|
for (let j = 0, jj = lines.length; j < jj; ++j) {
|
|
const coordinates = lines[j];
|
|
for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {
|
|
segments.push(coordinates.slice(i, i + 2));
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {Array<Array<import('../coordinate.js').Coordinate>>} segments Segments
|
|
* @param {import("../geom/MultiPoint.js").default} geometry Geometry.
|
|
* @private
|
|
*/
|
|
segmentMultiPointGeometry_(segments, geometry) {
|
|
geometry.getCoordinates().forEach((point) => {
|
|
segments.push([point]);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* @param {Array<Array<import('../coordinate.js').Coordinate>>} segments Segments
|
|
* @param {import("../geom/MultiPolygon.js").default} geometry Geometry.
|
|
* @private
|
|
*/
|
|
segmentMultiPolygonGeometry_(segments, 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) {
|
|
segments.push(coordinates.slice(i, i + 2));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @param {Array<Array<import('../coordinate.js').Coordinate>>} segments Segments
|
|
* @param {import("../geom/Point.js").default} geometry Geometry.
|
|
* @private
|
|
*/
|
|
segmentPointGeometry_(segments, geometry) {
|
|
segments.push([geometry.getCoordinates()]);
|
|
}
|
|
|
|
/**
|
|
* @param {Array<Array<import('../coordinate.js').Coordinate>>} segments Segments
|
|
* @param {import("../geom/Polygon.js").default} geometry Geometry.
|
|
* @private
|
|
*/
|
|
segmentPolygonGeometry_(segments, 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) {
|
|
segments.push(coordinates.slice(i, i + 2));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
export default Snap;
|