154 lines
4.0 KiB
JavaScript
154 lines
4.0 KiB
JavaScript
goog.provide('ol.geom.LinearRing');
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goog.require('ol.extent');
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goog.require('ol.geom.GeometryType');
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goog.require('ol.geom.SimpleGeometry');
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goog.require('ol.geom.flat.area');
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goog.require('ol.geom.flat.closest');
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goog.require('ol.geom.flat.deflate');
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goog.require('ol.geom.flat.inflate');
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goog.require('ol.geom.flat.simplify');
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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 {ol.geom.SimpleGeometry}
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* @param {Array.<ol.Coordinate>} coordinates Coordinates.
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* @param {ol.geom.GeometryLayout=} opt_layout Layout.
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* @api stable
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*/
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ol.geom.LinearRing = function(coordinates, opt_layout) {
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goog.base(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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this.setCoordinates(coordinates,
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/** @type {ol.geom.GeometryLayout|undefined} */ (opt_layout));
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};
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goog.inherits(ol.geom.LinearRing, ol.geom.SimpleGeometry);
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/**
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* @inheritDoc
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* @api stable
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*/
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ol.geom.LinearRing.prototype.clone = function() {
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var linearRing = new ol.geom.LinearRing(null);
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linearRing.setFlatCoordinates(this.layout, this.flatCoordinates.slice());
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return linearRing;
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};
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/**
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* @inheritDoc
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*/
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ol.geom.LinearRing.prototype.closestPointXY =
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function(x, y, closestPoint, minSquaredDistance) {
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if (minSquaredDistance <
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ol.extent.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(ol.geom.flat.closest.getMaxSquaredDelta(
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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 ol.geom.flat.closest.getClosestPoint(
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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 {number} Area (on projected plane).
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* @api stable
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*/
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ol.geom.LinearRing.prototype.getArea = function() {
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return ol.geom.flat.area.linearRing(
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this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
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};
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/**
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* @return {Array.<ol.Coordinate>} Coordinates.
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* @api stable
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*/
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ol.geom.LinearRing.prototype.getCoordinates = function() {
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return ol.geom.flat.inflate.coordinates(
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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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ol.geom.LinearRing.prototype.getSimplifiedGeometryInternal =
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function(squaredTolerance) {
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var simplifiedFlatCoordinates = [];
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simplifiedFlatCoordinates.length = ol.geom.flat.simplify.douglasPeucker(
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this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,
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squaredTolerance, simplifiedFlatCoordinates, 0);
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var simplifiedLinearRing = new ol.geom.LinearRing(null);
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simplifiedLinearRing.setFlatCoordinates(
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ol.geom.GeometryLayout.XY, simplifiedFlatCoordinates);
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return simplifiedLinearRing;
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};
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/**
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* @inheritDoc
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* @api stable
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*/
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ol.geom.LinearRing.prototype.getType = function() {
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return ol.geom.GeometryType.LINEAR_RING;
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};
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/**
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* @param {Array.<ol.Coordinate>} coordinates Coordinates.
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* @param {ol.geom.GeometryLayout=} opt_layout Layout.
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* @api stable
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*/
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ol.geom.LinearRing.prototype.setCoordinates =
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function(coordinates, opt_layout) {
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if (goog.isNull(coordinates)) {
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this.setFlatCoordinates(ol.geom.GeometryLayout.XY, null);
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} else {
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this.setLayout(opt_layout, coordinates, 1);
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if (goog.isNull(this.flatCoordinates)) {
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this.flatCoordinates = [];
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}
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this.flatCoordinates.length = ol.geom.flat.deflate.coordinates(
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this.flatCoordinates, 0, coordinates, this.stride);
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this.dispatchChangeEvent();
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}
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};
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/**
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* @param {ol.geom.GeometryLayout} layout Layout.
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* @param {Array.<number>} flatCoordinates Flat coordinates.
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*/
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ol.geom.LinearRing.prototype.setFlatCoordinates =
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function(layout, flatCoordinates) {
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this.setFlatCoordinatesInternal(layout, flatCoordinates);
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this.dispatchChangeEvent();
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};
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