b52d283641
The ol.geom.SharedVertices structure represents a flattened array of vertex coordinates. This is intended to support optimal WebGL rendering.
73 lines
1.9 KiB
JavaScript
73 lines
1.9 KiB
JavaScript
goog.provide('ol.geom.MultiLineString');
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goog.require('goog.asserts');
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goog.require('ol.geom.AbstractCollection');
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goog.require('ol.geom.GeometryType');
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goog.require('ol.geom.LineString');
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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.AbstractCollection}
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* @param {Array.<ol.geom.VertexArray>} coordinates Coordinates array.
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* @param {ol.geom.SharedVertices=} opt_shared Shared vertices.
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*/
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ol.geom.MultiLineString = 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 line
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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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var numParts = coordinates.length;
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/**
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* @type {Array.<ol.geom.LineString>}
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*/
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this.components = new Array(numParts);
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for (var i = 0; i < numParts; ++i) {
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this.components[i] = new ol.geom.LineString(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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};
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goog.inherits(ol.geom.MultiLineString, ol.geom.AbstractCollection);
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/**
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* @inheritDoc
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*/
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ol.geom.MultiLineString.prototype.getType = function() {
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return ol.geom.GeometryType.MULTILINESTRING;
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};
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/**
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* Create a multi-linestring geometry from an array of linestring geometries.
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*
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* @param {Array.<ol.geom.LineString>} geometries Array of geometries.
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* @param {ol.geom.SharedVertices=} opt_shared Shared vertices.
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* @return {ol.geom.MultiLineString} A new geometry.
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*/
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ol.geom.MultiLineString.fromParts = function(geometries, opt_shared) {
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var count = geometries.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] = geometries[i].getCoordinates();
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}
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return new ol.geom.MultiLineString(coordinates, opt_shared);
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};
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