146 lines
3.9 KiB
JavaScript
146 lines
3.9 KiB
JavaScript
/**
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* @module ol/geom/LinearRing
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*/
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import {inherits} from '../util.js';
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import {closestSquaredDistanceXY} from '../extent.js';
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import GeometryLayout from '../geom/GeometryLayout.js';
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import GeometryType from '../geom/GeometryType.js';
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import SimpleGeometry from '../geom/SimpleGeometry.js';
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import {linearRing as linearRingArea} from '../geom/flat/area.js';
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import {assignClosestPoint, maxSquaredDelta} from '../geom/flat/closest.js';
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import {deflateCoordinates} from '../geom/flat/deflate.js';
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import {inflateCoordinates} from '../geom/flat/inflate.js';
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import {douglasPeucker} from '../geom/flat/simplify.js';
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/**
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* @classdesc
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* Linear ring geometry. Only used as part of polygon; cannot be rendered
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* on its own.
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*
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* @constructor
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* @extends {module:ol/geom/SimpleGeometry}
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* @param {Array.<module:ol/coordinate~Coordinate>|Array.<number>} coordinates
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* Coordinates. (For internal use, flat coordinates in combination with
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* `opt_layout` are also accepted.)
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* @param {module:ol/geom/GeometryLayout=} opt_layout Layout.
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* @api
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*/
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class LinearRing {
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constructor(coordinates, opt_layout) {
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SimpleGeometry.call(this);
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/**
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* @private
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* @type {number}
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*/
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this.maxDelta_ = -1;
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/**
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* @private
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* @type {number}
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*/
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this.maxDeltaRevision_ = -1;
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if (opt_layout !== undefined && !Array.isArray(coordinates[0])) {
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this.setFlatCoordinates(opt_layout, coordinates);
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} else {
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this.setCoordinates(coordinates, opt_layout);
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}
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}
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/**
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* Make a complete copy of the geometry.
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* @return {!module:ol/geom/LinearRing} Clone.
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* @override
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* @api
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*/
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clone() {
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return new LinearRing(this.flatCoordinates.slice(), this.layout);
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}
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/**
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* @inheritDoc
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*/
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closestPointXY(x, y, closestPoint, minSquaredDistance) {
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if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {
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return minSquaredDistance;
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}
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if (this.maxDeltaRevision_ != this.getRevision()) {
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this.maxDelta_ = Math.sqrt(maxSquaredDelta(
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this.flatCoordinates, 0, this.flatCoordinates.length, this.stride, 0));
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this.maxDeltaRevision_ = this.getRevision();
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}
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return assignClosestPoint(
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this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
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this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);
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}
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/**
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* Return the area of the linear ring on projected plane.
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* @return {number} Area (on projected plane).
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* @api
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*/
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getArea() {
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return linearRingArea(this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
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}
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/**
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* Return the coordinates of the linear ring.
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* @return {Array.<module:ol/coordinate~Coordinate>} Coordinates.
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* @override
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* @api
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*/
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getCoordinates() {
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return inflateCoordinates(
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this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
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}
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/**
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* @inheritDoc
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*/
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getSimplifiedGeometryInternal(squaredTolerance) {
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const simplifiedFlatCoordinates = [];
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simplifiedFlatCoordinates.length = douglasPeucker(
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this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
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squaredTolerance, simplifiedFlatCoordinates, 0);
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return new LinearRing(simplifiedFlatCoordinates, GeometryLayout.XY);
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}
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/**
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* @inheritDoc
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* @api
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*/
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getType() {
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return GeometryType.LINEAR_RING;
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}
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/**
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* @inheritDoc
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*/
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intersectsExtent(extent) {}
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/**
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* Set the coordinates of the linear ring.
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* @param {!Array.<module:ol/coordinate~Coordinate>} coordinates Coordinates.
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* @param {module:ol/geom/GeometryLayout=} opt_layout Layout.
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* @override
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* @api
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*/
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setCoordinates(coordinates, opt_layout) {
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this.setLayout(opt_layout, coordinates, 1);
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if (!this.flatCoordinates) {
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this.flatCoordinates = [];
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}
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this.flatCoordinates.length = deflateCoordinates(
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this.flatCoordinates, 0, coordinates, this.stride);
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this.changed();
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}
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}
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inherits(LinearRing, SimpleGeometry);
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export default LinearRing;
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