db17be34f6
git-svn-id: http://svn.openlayers.org/tags/openlayers/release-2.4-rc1@3001 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
57 lines
1.8 KiB
JavaScript
57 lines
1.8 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under a modified BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/release-license.txt
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* for the full text of the license. */
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/**
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* @class
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*
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* Polygon is a collection of Geometry.LinearRings.
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*
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* The first ring (this.component[0])is the outer bounds of the polygon and
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* all subsequent rings (this.component[1-n]) are internal holes.
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*
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* @requires OpenLayers/Geometry/Collection.js
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*/
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OpenLayers.Geometry.Polygon = OpenLayers.Class.create();
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OpenLayers.Geometry.Polygon.prototype =
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OpenLayers.Class.inherit(OpenLayers.Geometry.Collection, {
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/**
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* An array of class names representing the types of components that
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* the collection can include. A null value means the component types
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* are not restricted.
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* @type Array(String)
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*/
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componentTypes: ["OpenLayers.Geometry.LinearRing"],
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/**
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* @constructor
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*
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* @param {Array(OpenLayers.Geometry.LinearRing)}
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*/
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initialize: function(components) {
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OpenLayers.Geometry.Collection.prototype.initialize.apply(this,
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arguments);
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},
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/** Calculated by subtracting the areas of the internal holes from the
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* area of the outer hole.
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*
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* @returns The area of the geometry
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* @type float
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*/
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getArea: function() {
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var area = 0.0;
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if ( this.components && (this.components.length > 0)) {
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area += Math.abs(this.components[0].getArea());
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for (var i = 1; i < this.components.length; i++) {
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area -= Math.abs(this.components[i].getArea());
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}
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}
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return area;
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},
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/** @final @type String */
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CLASS_NAME: "OpenLayers.Geometry.Polygon"
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});
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