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Allow geometries to use a shared vertex array

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The ol.geom.SharedVertices structure represents a flattened array of vertex coordinates.  This is intended to support optimal WebGL rendering.
This commit is contained in:
Tim Schaub
2013-03-02 18:39:24 +01:00
parent bdfa2cc88c
commit b52d283641
23 changed files with 1086 additions and 217 deletions
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src/ol/geom/multilinestring.js
+37 -15
View File
@@ -1,45 +1,50 @@
goog.provide('ol.geom.MultiLineString');
goog.require('goog.asserts');
goog.require('ol.geom.CoordinateArray');
goog.require('ol.geom.GeometryCollection');
goog.require('ol.geom.AbstractCollection');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.LineString');
goog.require('ol.geom.SharedVertices');
goog.require('ol.geom.VertexArray');
/**
* @constructor
* @extends {ol.geom.GeometryCollection}
* @param {Array.<ol.geom.CoordinateArray>} coordinates Coordinates array.
* @extends {ol.geom.AbstractCollection}
* @param {Array.<ol.geom.VertexArray>} coordinates Coordinates array.
* @param {ol.geom.SharedVertices=} opt_shared Shared vertices.
*/
ol.geom.MultiLineString = function(coordinates) {
ol.geom.MultiLineString = function(coordinates, opt_shared) {
goog.base(this);
goog.asserts.assert(goog.isArray(coordinates[0][0]));
var numParts = coordinates.length,
var vertices = opt_shared,
dimension;
if (!goog.isDef(vertices)) {
// try to get dimension from first vertex in first line
dimension = coordinates[0][0].length;
vertices = new ol.geom.SharedVertices({dimension: dimension});
}
var numParts = coordinates.length;
/**
* @type {Array.<ol.geom.LineString>}
*/
this.components = new Array(numParts);
for (var i = 0; i < numParts; ++i) {
this.components[i] = new ol.geom.LineString(coordinates[i]);
if (!goog.isDef(dimension)) {
dimension = this.components[i].dimension;
} else {
goog.asserts.assert(this.components[i].dimension === dimension);
}
this.components[i] = new ol.geom.LineString(coordinates[i], vertices);
}
/**
* @type {number}
*/
this.dimension = dimension;
goog.asserts.assert(this.dimension >= 2);
this.dimension = vertices.getDimension();
};
goog.inherits(ol.geom.MultiLineString, ol.geom.GeometryCollection);
goog.inherits(ol.geom.MultiLineString, ol.geom.AbstractCollection);
/**
@@ -48,3 +53,20 @@ goog.inherits(ol.geom.MultiLineString, ol.geom.GeometryCollection);
ol.geom.MultiLineString.prototype.getType = function() {
return ol.geom.GeometryType.MULTILINESTRING;
};
/**
* Create a multi-linestring geometry from an array of linestring geometries.
*
* @param {Array.<ol.geom.LineString>} geometries Array of geometries.
* @param {ol.geom.SharedVertices=} opt_shared Shared vertices.
* @return {ol.geom.MultiLineString} A new geometry.
*/
ol.geom.MultiLineString.fromParts = function(geometries, opt_shared) {
var count = geometries.length;
var coordinates = new Array(count);
for (var i = 0; i < count; ++i) {
coordinates[i] = geometries[i].getCoordinates();
}
return new ol.geom.MultiLineString(coordinates, opt_shared);
};