99ba5a0da8
KML and WKT don't specify a winding order, so we write those out in CW/CCW order (for exterior/interior). GML references ISO 19107 that specifies CCW/CW, so we serialize in that winding order. Having hand generated all this GML data the first time around, I reserve the right to modify it for the tests.
129 lines
3.4 KiB
JavaScript
129 lines
3.4 KiB
JavaScript
goog.provide('ol.geom.Polygon');
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goog.require('goog.asserts');
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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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* Create a polygon from an array of vertex arrays. Coordinates for the
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* exterior ring will be forced to clockwise order. Coordinates for any
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* interior rings will be forced to counter-clockwise order. In cases where
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* the opposite winding order occurs in the passed vertex arrays, they will
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* be modified in place.
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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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var ringCoords;
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for (var i = 0; i < numRings; ++i) {
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ringCoords = coordinates[i];
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if (i === 0) {
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// force exterior ring to be clockwise
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if (!ol.geom.LinearRing.isClockwise(ringCoords)) {
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ringCoords.reverse();
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}
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} else {
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// force interior rings to be counter-clockwise
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if (ol.geom.LinearRing.isClockwise(ringCoords)) {
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ringCoords.reverse();
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}
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}
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this.rings[i] = new ol.geom.LinearRing(ringCoords, 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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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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/**
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* Check whether a given coordinate is inside this polygon. Note that this is a
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* fast and simple check - points on an edge or vertex of the polygon or one of
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* its inner rings are either classified inside or outside.
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*
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* @param {ol.Coordinate} coordinate Coordinate.
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* @return {boolean} Whether the coordinate is inside the polygon.
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*/
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ol.geom.Polygon.prototype.containsCoordinate = function(coordinate) {
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var rings = this.rings;
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/** @type {boolean} */
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var containsCoordinate;
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for (var i = 0, ii = rings.length; i < ii; ++i) {
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containsCoordinate = rings[i].containsCoordinate(coordinate);
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// if inner ring (i > 0) contains coordinate, polygon does not contain it
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if (i > 0) {
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containsCoordinate = !containsCoordinate;
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}
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if (!containsCoordinate) {
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break;
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}
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}
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return containsCoordinate;
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};
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