b52d283641
The ol.geom.SharedVertices structure represents a flattened array of vertex coordinates. This is intended to support optimal WebGL rendering.
91 lines
2.0 KiB
JavaScript
91 lines
2.0 KiB
JavaScript
goog.provide('ol.geom.Polygon');
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goog.require('goog.asserts');
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goog.require('ol.Extent');
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goog.require('ol.geom.Geometry');
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goog.require('ol.geom.GeometryType');
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goog.require('ol.geom.LinearRing');
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goog.require('ol.geom.SharedVertices');
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goog.require('ol.geom.VertexArray');
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/**
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* @constructor
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* @extends {ol.geom.Geometry}
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* @param {Array.<ol.geom.VertexArray>} coordinates Array of rings. First
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* is outer, any remaining are inner.
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* @param {ol.geom.SharedVertices=} opt_shared Shared vertices.
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*/
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ol.geom.Polygon = function(coordinates, opt_shared) {
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goog.base(this);
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goog.asserts.assert(goog.isArray(coordinates[0][0]));
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var vertices = opt_shared,
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dimension;
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if (!goog.isDef(vertices)) {
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// try to get dimension from first vertex in first ring
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dimension = coordinates[0][0].length;
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vertices = new ol.geom.SharedVertices({dimension: dimension});
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}
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/**
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* @type {ol.geom.SharedVertices}
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*/
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this.vertices = vertices;
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var numRings = coordinates.length;
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/**
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* @type {Array.<ol.geom.LinearRing>}
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*/
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this.rings = new Array(numRings);
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for (var i = 0; i < numRings; ++i) {
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this.rings[i] = new ol.geom.LinearRing(coordinates[i], vertices);
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}
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/**
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* @type {number}
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*/
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this.dimension = vertices.getDimension();
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goog.asserts.assert(this.dimension >= 2);
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/**
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* @type {ol.Extent}
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* @private
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*/
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this.bounds_ = null;
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};
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goog.inherits(ol.geom.Polygon, ol.geom.Geometry);
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/**
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* @inheritDoc
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*/
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ol.geom.Polygon.prototype.getBounds = function() {
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return this.rings[0].getBounds();
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};
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/**
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* @return {Array.<ol.geom.VertexArray>} Coordinates array.
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*/
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ol.geom.Polygon.prototype.getCoordinates = function() {
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var count = this.rings.length;
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var coordinates = new Array(count);
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for (var i = 0; i < count; ++i) {
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coordinates[i] = this.rings[i].getCoordinates();
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}
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return coordinates;
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};
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/**
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* @inheritDoc
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*/
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ol.geom.Polygon.prototype.getType = function() {
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return ol.geom.GeometryType.POLYGON;
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};
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