Merge pull request #2167 from elemoine/graticule
Add a Graticule component
This commit is contained in:
Marc Jansen
176
examples/data/geojson/countries-110m.geojson
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176
examples/data/geojson/countries-110m.geojson
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File diff suppressed because one or more lines are too long
51
examples/graticule.html
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51
examples/graticule.html
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="chrome=1">
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<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
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<link rel="stylesheet" href="../css/ol.css" type="text/css">
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<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="../resources/layout.css" type="text/css">
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<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap-responsive.min.css" type="text/css">
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<title>Graticule example</title>
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</head>
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<body>
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<div class="navbar navbar-inverse navbar-fixed-top">
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<div class="navbar-inner">
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<div class="container">
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<a class="brand" href="./"><img src="../resources/logo.png"> OpenLayers 3 Examples</a>
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</div>
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</div>
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</div>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12">
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<div id="map" class="map"></div>
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</div>
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</div>
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<div class="row-fluid">
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<div class="span12">
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<h4 id="title">Graticule example</h4>
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<p id="shortdesc">This example shows how to add a graticule overlay to a map.</p>
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<div id="docs">
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<p>See the <a href="graticule.js" target="_blank">graticule.js source</a> to see how this is done.</p>
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</div>
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<div id="tags">graticule</div>
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</div>
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</div>
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</div>
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<script src="jquery.min.js" type="text/javascript"></script>
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<script src="../resources/example-behaviour.js" type="text/javascript"></script>
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<script src="loader.js?id=graticule" type="text/javascript"></script>
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</body>
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</html>
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25
examples/graticule.js
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25
examples/graticule.js
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@@ -0,0 +1,25 @@
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goog.require('ol.Graticule');
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goog.require('ol.Map');
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goog.require('ol.View');
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goog.require('ol.layer.Tile');
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goog.require('ol.proj');
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goog.require('ol.source.OSM');
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var map = new ol.Map({
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layers: [
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new ol.layer.Tile({
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source: new ol.source.OSM()
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})
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],
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renderer: 'canvas',
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target: 'map',
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view: new ol.View({
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center: ol.proj.transform([4.8, 47.75], 'EPSG:4326', 'EPSG:3857'),
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zoom: 5
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})
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});
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// Create the graticule component
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var graticule = new ol.Graticule();
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graticule.setMap(map);
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52
examples/sphere-mollweide.html
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52
examples/sphere-mollweide.html
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@@ -0,0 +1,52 @@
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="chrome=1">
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<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
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<link rel="stylesheet" href="../css/ol.css" type="text/css">
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<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap.min.css" type="text/css">
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<link rel="stylesheet" href="../resources/layout.css" type="text/css">
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<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap-responsive.min.css" type="text/css">
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<title>Sphere Mollweide example</title>
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</head>
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<body>
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<div class="navbar navbar-inverse navbar-fixed-top">
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<div class="navbar-inner">
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<div class="container">
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<a class="brand" href="./"><img src="../resources/logo.png"> OpenLayers 3 Examples</a>
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</div>
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</div>
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</div>
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<div class="container-fluid">
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<div class="row-fluid">
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<div class="span12">
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<div id="map" class="map"></div>
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</div>
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</div>
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<div class="row-fluid">
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<div class="span12">
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<h4 id="title">Sphere Mollweide example</h4>
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<p id="shortdesc">Example of a Sphere Mollweide map with a Graticule component.</p>
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<div id="docs">
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<p>See the <a href="sphere-mollweide.js" target="_blank">sphere-mollweide.js source</a> to see how this is done.</p>
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</div>
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<div id="tags">graticule, Mollweide, projection, proj4js</div>
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</div>
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</div>
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</div>
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<script src="jquery.min.js" type="text/javascript"></script>
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<script src="../resources/example-behaviour.js" type="text/javascript"></script>
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<script src="http://cdnjs.cloudflare.com/ajax/libs/proj4js/2.2.1/proj4.js" type="text/javascript"></script>
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<script src="loader.js?id=sphere-mollweide" type="text/javascript"></script>
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</body>
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</html>
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42
examples/sphere-mollweide.js
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42
examples/sphere-mollweide.js
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goog.require('ol.Graticule');
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goog.require('ol.Map');
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goog.require('ol.View');
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goog.require('ol.layer.Vector');
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goog.require('ol.proj');
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goog.require('ol.source.GeoJSON');
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proj4.defs('ESRI:53009', '+proj=moll +lon_0=0 +x_0=0 +y_0=0 +a=6371000 ' +
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'+b=6371000 +units=m +no_defs');
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// Configure the Sphere Mollweide projection object with an extent,
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// and a world extent. These are required for the Graticule.
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var sphereMollweideProjection = ol.proj.get('ESRI:53009');
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sphereMollweideProjection.setExtent([
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-9009954.605703328, -9009954.605703328,
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9009954.605703328, 9009954.605703328]);
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sphereMollweideProjection.setWorldExtent([-179, -90, 179, 90]);
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var map = new ol.Map({
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keyboardEventTarget: document,
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layers: [
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new ol.layer.Vector({
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source: new ol.source.GeoJSON({
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projection: sphereMollweideProjection,
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url: 'data/geojson/countries-110m.geojson'
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})
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})
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],
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renderer: 'canvas',
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target: 'map',
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view: new ol.View({
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center: [0, 0],
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projection: sphereMollweideProjection,
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resolutions: [65536, 32768, 16384, 8192, 4096, 2048],
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zoom: 0
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})
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});
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var graticule = new ol.Graticule({
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map: map
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});
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@@ -106,6 +106,41 @@ olx.GeolocationOptions.prototype.projection;
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olx.LogoOptions;
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/**
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* @typedef {{map: (ol.Map|undefined),
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* maxLines: (number|undefined),
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* targetSize: (number|undefined)}}
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*/
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olx.GraticuleOptions;
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/**
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* Reference to an `ol.Map` object.
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* @type {ol.Map|undefined}
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*/
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olx.GraticuleOptions.prototype.map;
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/**
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* The maximum number of meridians and parallels from the center of the
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* map. The default value is 100, which means that at most 200 meridians
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* and 200 parallels will be displayed. The default value is appropriate
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* for conformal projections like Spherical Mercator. If you increase
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* the value more lines will be drawn and the drawing performance will
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* decrease.
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* @type {number|undefined}
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*/
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olx.GraticuleOptions.prototype.maxLines;
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/**
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* The target size of the graticule cells, in pixels. Default
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* value is 100 pixels.
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* @type {number|undefined}
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*/
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olx.GraticuleOptions.prototype.targetSize;
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/**
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* Object literal with config options for the map.
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* @typedef {{controls: (ol.Collection|Array.<ol.control.Control>|undefined),
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@@ -293,7 +328,8 @@ olx.OverlayOptions.prototype.insertFirst;
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* units: (ol.proj.Units|string),
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* extent: (ol.Extent|undefined),
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* axisOrientation: (string|undefined),
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* global: (boolean|undefined)}}
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* global: (boolean|undefined),
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* worldExtent: (ol.Extent|undefined)}}
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* @api
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*/
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olx.ProjectionOptions;
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@@ -334,6 +370,13 @@ olx.ProjectionOptions.prototype.axisOrientation;
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olx.ProjectionOptions.prototype.global;
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/**
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* The world extent for the SRS.
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* @type {ol.Extent|undefined}
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*/
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olx.ProjectionOptions.prototype.worldExtent;
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/**
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* Object literal with config options for the view.
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* @typedef {{center: (ol.Coordinate|undefined),
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180
src/ol/geom/flat/geodesicflatgeom.js
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180
src/ol/geom/flat/geodesicflatgeom.js
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goog.provide('ol.geom.flat.geodesic');
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goog.require('goog.asserts');
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goog.require('goog.math');
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goog.require('goog.object');
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goog.require('ol.TransformFunction');
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goog.require('ol.math');
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goog.require('ol.proj');
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/**
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* @private
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* @param {function(number): ol.Coordinate} interpolate Interpolate function.
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* @param {ol.TransformFunction} transform Transform from longitude/latitude to
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* projected coordinates.
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* @param {number} squaredTolerance Squared tolerance.
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* @return {Array.<number>} Flat coordinates.
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*/
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ol.geom.flat.geodesic.line_ =
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function(interpolate, transform, squaredTolerance) {
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// FIXME reduce garbage generation
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// FIXME optimize stack operations
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/** @type {Array.<number>} */
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var flatCoordinates = [];
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var geoA = interpolate(0);
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var geoB = interpolate(1);
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var a = transform(geoA);
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var b = transform(geoB);
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/** @type {Array.<ol.Coordinate>} */
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var geoStack = [geoB, geoA];
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/** @type {Array.<ol.Coordinate>} */
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var stack = [b, a];
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/** @type {Array.<number>} */
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var fractionStack = [1, 0];
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/** @type {Object.<number, boolean>} */
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var fractions = {};
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var maxIterations = 1e5;
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var geoM, m, fracA, fracB, fracM, key;
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while (--maxIterations > 0 && fractionStack.length > 0) {
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// Pop the a coordinate off the stack
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fracA = fractionStack.pop();
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geoA = geoStack.pop();
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a = stack.pop();
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// Add the a coordinate if it has not been added yet
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key = fracA.toString();
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if (!goog.object.containsKey(fractions, key)) {
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flatCoordinates.push(a[0], a[1]);
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goog.object.set(fractions, key, true);
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}
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// Pop the b coordinate off the stack
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fracB = fractionStack.pop();
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geoB = geoStack.pop();
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b = stack.pop();
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// Find the m point between the a and b coordinates
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fracM = (fracA + fracB) / 2;
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geoM = interpolate(fracM);
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m = transform(geoM);
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if (ol.math.squaredSegmentDistance(m[0], m[1], a[0], a[1],
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b[0], b[1]) < squaredTolerance) {
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// If the m point is sufficiently close to the straight line, then we
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// discard it. Just use the b coordinate and move on to the next line
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// segment.
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flatCoordinates.push(b[0], b[1]);
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key = fracB.toString();
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goog.asserts.assert(!goog.object.containsKey(fractions, key));
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goog.object.set(fractions, key, true);
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} else {
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// Otherwise, we need to subdivide the current line segment. Split it
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// into two and push the two line segments onto the stack.
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fractionStack.push(fracB, fracM, fracM, fracA);
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stack.push(b, m, m, a);
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geoStack.push(geoB, geoM, geoM, geoA);
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}
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}
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goog.asserts.assert(maxIterations > 0);
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return flatCoordinates;
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};
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/**
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* Generate a great-circle arcs between two lat/lon points.
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* @param {number} lon1 Longitude 1 in degrees.
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* @param {number} lat1 Latitude 1 in degrees.
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* @param {number} lon2 Longitude 2 in degrees.
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* @param {number} lat2 Latitude 2 in degrees.
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* @param {ol.proj.Projection} projection Projection.
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* @param {number} squaredTolerance Squared tolerance.
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* @return {Array.<number>} Flat coordinates.
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*/
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ol.geom.flat.geodesic.greatCircleArc = function(
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lon1, lat1, lon2, lat2, projection, squaredTolerance) {
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var geoProjection = ol.proj.get('EPSG:4326');
|
||||
|
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var cosLat1 = Math.cos(goog.math.toRadians(lat1));
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var sinLat1 = Math.sin(goog.math.toRadians(lat1));
|
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var cosLat2 = Math.cos(goog.math.toRadians(lat2));
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var sinLat2 = Math.sin(goog.math.toRadians(lat2));
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var cosDeltaLon = Math.cos(goog.math.toRadians(lon2 - lon1));
|
||||
var sinDeltaLon = Math.sin(goog.math.toRadians(lon2 - lon1));
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var d = sinLat1 * sinLat2 + cosLat1 * cosLat2 * cosDeltaLon;
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||||
return ol.geom.flat.geodesic.line_(
|
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/**
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* @param {number} frac Fraction.
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* @return {ol.Coordinate} Coordinate.
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*/
|
||||
function(frac) {
|
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if (1 <= d) {
|
||||
return [lon2, lat2];
|
||||
}
|
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var D = frac * Math.acos(d);
|
||||
var cosD = Math.cos(D);
|
||||
var sinD = Math.sin(D);
|
||||
var y = sinDeltaLon * cosLat2;
|
||||
var x = cosLat1 * sinLat2 - sinLat1 * cosLat2 * cosDeltaLon;
|
||||
var theta = Math.atan2(y, x);
|
||||
var lat = Math.asin(sinLat1 * cosD + cosLat1 * sinD * Math.cos(theta));
|
||||
var lon = goog.math.toRadians(lon1) +
|
||||
Math.atan2(Math.sin(theta) * sinD * cosLat1,
|
||||
cosD - sinLat1 * Math.sin(lat));
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||||
return [goog.math.toDegrees(lon), goog.math.toDegrees(lat)];
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||||
}, ol.proj.getTransform(geoProjection, projection), squaredTolerance);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Generate a meridian (line at constant longitude).
|
||||
* @param {number} lon Longitude.
|
||||
* @param {number} lat1 Latitude 1.
|
||||
* @param {number} lat2 Latitude 2.
|
||||
* @param {ol.proj.Projection} projection Projection.
|
||||
* @param {number} squaredTolerance Squared tolerance.
|
||||
* @return {Array.<number>} Flat coordinates.
|
||||
*/
|
||||
ol.geom.flat.geodesic.meridian =
|
||||
function(lon, lat1, lat2, projection, squaredTolerance) {
|
||||
var epsg4326Projection = ol.proj.get('EPSG:4326');
|
||||
return ol.geom.flat.geodesic.line_(
|
||||
/**
|
||||
* @param {number} frac Fraction.
|
||||
* @return {ol.Coordinate} Coordinate.
|
||||
*/
|
||||
function(frac) {
|
||||
return [lon, lat1 + ((lat2 - lat1) * frac)];
|
||||
},
|
||||
ol.proj.getTransform(epsg4326Projection, projection), squaredTolerance);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Generate a parallel (line at constant latitude).
|
||||
* @param {number} lat Latitude.
|
||||
* @param {number} lon1 Longitude 1.
|
||||
* @param {number} lon2 Longitude 2.
|
||||
* @param {ol.proj.Projection} projection Projection.
|
||||
* @param {number} squaredTolerance Squared tolerance.
|
||||
* @return {Array.<number>} Flat coordinates.
|
||||
*/
|
||||
ol.geom.flat.geodesic.parallel =
|
||||
function(lat, lon1, lon2, projection, squaredTolerance) {
|
||||
var epsg4326Projection = ol.proj.get('EPSG:4326');
|
||||
return ol.geom.flat.geodesic.line_(
|
||||
/**
|
||||
* @param {number} frac Fraction.
|
||||
* @return {ol.Coordinate} Coordinate.
|
||||
*/
|
||||
function(frac) {
|
||||
return [lon1 + ((lon2 - lon1) * frac), lat];
|
||||
},
|
||||
ol.proj.getTransform(epsg4326Projection, projection), squaredTolerance);
|
||||
};
|
||||
427
src/ol/graticule.js
Normal file
427
src/ol/graticule.js
Normal file
@@ -0,0 +1,427 @@
|
||||
goog.provide('ol.Graticule');
|
||||
|
||||
goog.require('goog.asserts');
|
||||
goog.require('goog.math');
|
||||
goog.require('ol.extent');
|
||||
goog.require('ol.geom.LineString');
|
||||
goog.require('ol.geom.flat.geodesic');
|
||||
goog.require('ol.proj');
|
||||
goog.require('ol.render.EventType');
|
||||
goog.require('ol.style.Stroke');
|
||||
|
||||
|
||||
|
||||
/**
|
||||
* @constructor
|
||||
* @param {olx.GraticuleOptions=} opt_options Options.
|
||||
* @api
|
||||
*/
|
||||
ol.Graticule = function(opt_options) {
|
||||
|
||||
var options = goog.isDef(opt_options) ? opt_options : {};
|
||||
|
||||
/**
|
||||
* @type {ol.Map}
|
||||
* @private
|
||||
*/
|
||||
this.map_ = null;
|
||||
|
||||
/**
|
||||
* @type {ol.proj.Projection}
|
||||
* @private
|
||||
*/
|
||||
this.projection_ = null;
|
||||
|
||||
/**
|
||||
* @type {number}
|
||||
* @private
|
||||
*/
|
||||
this.maxLat_ = Infinity;
|
||||
|
||||
/**
|
||||
* @type {number}
|
||||
* @private
|
||||
*/
|
||||
this.maxLon_ = Infinity;
|
||||
|
||||
/**
|
||||
* @type {number}
|
||||
* @private
|
||||
*/
|
||||
this.minLat_ = -Infinity;
|
||||
|
||||
/**
|
||||
* @type {number}
|
||||
* @private
|
||||
*/
|
||||
this.minLon_ = -Infinity;
|
||||
|
||||
/**
|
||||
* @type {number}
|
||||
* @private
|
||||
*/
|
||||
this.targetSize_ = goog.isDef(options.targetSize) ?
|
||||
options.targetSize : 100;
|
||||
|
||||
/**
|
||||
* @type {number}
|
||||
* @private
|
||||
*/
|
||||
this.maxLines_ = goog.isDef(options.maxLines) ? options.maxLines : 100;
|
||||
goog.asserts.assert(this.maxLines_ > 0);
|
||||
|
||||
/**
|
||||
* @type {Array.<ol.geom.LineString>}
|
||||
* @private
|
||||
*/
|
||||
this.meridians_ = [];
|
||||
|
||||
/**
|
||||
* @type {Array.<ol.geom.LineString>}
|
||||
* @private
|
||||
*/
|
||||
this.parallels_ = [];
|
||||
|
||||
/**
|
||||
* TODO can be configurable
|
||||
* @type {ol.style.Stroke}
|
||||
* @private
|
||||
*/
|
||||
this.strokeStyle_ = new ol.style.Stroke({
|
||||
color: 'rgba(0,0,0,0.2)'
|
||||
});
|
||||
|
||||
/**
|
||||
* @type {ol.TransformFunction|undefined}
|
||||
* @private
|
||||
*/
|
||||
this.fromLonLatTransform_ = undefined;
|
||||
|
||||
/**
|
||||
* @type {ol.TransformFunction|undefined}
|
||||
* @private
|
||||
*/
|
||||
this.toLonLatTransform_ = undefined;
|
||||
|
||||
/**
|
||||
* @type {ol.Coordinate}
|
||||
* @private
|
||||
*/
|
||||
this.projectionCenterLonLat_ = null;
|
||||
|
||||
this.setMap(goog.isDef(options.map) ? options.map : null);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* TODO can be configurable
|
||||
* @type {Array.<number>}
|
||||
* @private
|
||||
*/
|
||||
ol.Graticule.intervals_ = [90, 45, 30, 20, 10, 5, 2, 1, 0.5, 0.2, 0.1, 0.05,
|
||||
0.01, 0.005, 0.002, 0.001];
|
||||
|
||||
|
||||
/**
|
||||
* @param {number} lon Longitude.
|
||||
* @param {number} squaredTolerance Squared tolerance.
|
||||
* @param {ol.Extent} extent Extent.
|
||||
* @param {number} index Index.
|
||||
* @return {number} Index.
|
||||
* @private
|
||||
*/
|
||||
ol.Graticule.prototype.addMeridian_ =
|
||||
function(lon, squaredTolerance, extent, index) {
|
||||
var lineString = this.getMeridian_(lon, squaredTolerance, index);
|
||||
if (ol.extent.intersects(lineString.getExtent(), extent)) {
|
||||
this.meridians_[index++] = lineString;
|
||||
}
|
||||
return index;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {number} lat Latitude.
|
||||
* @param {number} squaredTolerance Squared tolerance.
|
||||
* @param {ol.Extent} extent Extent.
|
||||
* @param {number} index Index.
|
||||
* @return {number} Index.
|
||||
* @private
|
||||
*/
|
||||
ol.Graticule.prototype.addParallel_ =
|
||||
function(lat, squaredTolerance, extent, index) {
|
||||
var lineString = this.getParallel_(lat, squaredTolerance, index);
|
||||
if (ol.extent.intersects(lineString.getExtent(), extent)) {
|
||||
this.parallels_[index++] = lineString;
|
||||
}
|
||||
return index;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {ol.Extent} extent Extent.
|
||||
* @param {ol.Coordinate} center Center.
|
||||
* @param {number} resolution Resolution.
|
||||
* @param {number} squaredTolerance Squared tolerance.
|
||||
* @private
|
||||
*/
|
||||
ol.Graticule.prototype.createGraticule_ =
|
||||
function(extent, center, resolution, squaredTolerance) {
|
||||
|
||||
var interval = this.getInterval_(resolution);
|
||||
if (interval == -1) {
|
||||
this.meridians_.length = this.parallels_.length = 0;
|
||||
return;
|
||||
}
|
||||
|
||||
var centerLonLat = this.toLonLatTransform_(center);
|
||||
var centerLon = centerLonLat[0];
|
||||
var centerLat = centerLonLat[1];
|
||||
var maxLines = this.maxLines_;
|
||||
var cnt, idx, lat, lon;
|
||||
|
||||
// Create meridians
|
||||
|
||||
centerLon = Math.floor(centerLon / interval) * interval;
|
||||
lon = goog.math.clamp(centerLon, this.minLon_, this.maxLon_);
|
||||
|
||||
idx = this.addMeridian_(lon, squaredTolerance, extent, 0);
|
||||
|
||||
cnt = 0;
|
||||
while (lon != this.minLon_ && cnt++ < maxLines) {
|
||||
lon = Math.max(lon - interval, this.minLon_);
|
||||
idx = this.addMeridian_(lon, squaredTolerance, extent, idx);
|
||||
}
|
||||
|
||||
lon = goog.math.clamp(centerLon, this.minLon_, this.maxLon_);
|
||||
|
||||
cnt = 0;
|
||||
while (lon != this.maxLon_ && cnt++ < maxLines) {
|
||||
lon = Math.min(lon + interval, this.maxLon_);
|
||||
idx = this.addMeridian_(lon, squaredTolerance, extent, idx);
|
||||
}
|
||||
|
||||
this.meridians_.length = idx;
|
||||
|
||||
// Create parallels
|
||||
|
||||
centerLat = Math.floor(centerLat / interval) * interval;
|
||||
lat = goog.math.clamp(centerLat, this.minLat_, this.maxLat_);
|
||||
|
||||
idx = this.addParallel_(lat, squaredTolerance, extent, 0);
|
||||
|
||||
cnt = 0;
|
||||
while (lat != this.minLat_ && cnt++ < maxLines) {
|
||||
lat = Math.max(lat - interval, this.minLat_);
|
||||
idx = this.addParallel_(lat, squaredTolerance, extent, idx);
|
||||
}
|
||||
|
||||
lat = goog.math.clamp(centerLat, this.minLat_, this.maxLat_);
|
||||
|
||||
cnt = 0;
|
||||
while (lat != this.maxLat_ && cnt++ < maxLines) {
|
||||
lat = Math.min(lat + interval, this.maxLat_);
|
||||
idx = this.addParallel_(lat, squaredTolerance, extent, idx);
|
||||
}
|
||||
|
||||
this.parallels_.length = idx;
|
||||
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {number} resolution Resolution.
|
||||
* @return {number} The interval in degrees.
|
||||
* @private
|
||||
*/
|
||||
ol.Graticule.prototype.getInterval_ = function(resolution) {
|
||||
var centerLon = this.projectionCenterLonLat_[0];
|
||||
var centerLat = this.projectionCenterLonLat_[1];
|
||||
var interval = -1;
|
||||
var i, ii, delta, dist;
|
||||
var target = Math.pow(this.targetSize_ * resolution, 2);
|
||||
/** @type {Array.<number>} **/
|
||||
var p1 = [];
|
||||
/** @type {Array.<number>} **/
|
||||
var p2 = [];
|
||||
for (i = 0, ii = ol.Graticule.intervals_.length; i < ii; ++i) {
|
||||
delta = ol.Graticule.intervals_[i] / 2;
|
||||
p1[0] = centerLon - delta;
|
||||
p1[1] = centerLat - delta;
|
||||
p2[0] = centerLon + delta;
|
||||
p2[1] = centerLat + delta;
|
||||
this.fromLonLatTransform_(p1, p1);
|
||||
this.fromLonLatTransform_(p2, p2);
|
||||
dist = Math.pow(p2[0] - p1[0], 2) + Math.pow(p2[1] - p1[1], 2);
|
||||
if (dist <= target) {
|
||||
break;
|
||||
}
|
||||
interval = ol.Graticule.intervals_[i];
|
||||
}
|
||||
return interval;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @return {ol.Map} The map.
|
||||
* @api
|
||||
*/
|
||||
ol.Graticule.prototype.getMap = function() {
|
||||
return this.map_;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {number} lon Longitude.
|
||||
* @param {number} squaredTolerance Squared tolerance.
|
||||
* @return {ol.geom.LineString} The meridian line string.
|
||||
* @param {number} index Index.
|
||||
* @private
|
||||
*/
|
||||
ol.Graticule.prototype.getMeridian_ = function(lon, squaredTolerance, index) {
|
||||
goog.asserts.assert(lon >= this.minLon_);
|
||||
goog.asserts.assert(lon <= this.maxLon_);
|
||||
var flatCoordinates = ol.geom.flat.geodesic.meridian(lon,
|
||||
this.minLat_, this.maxLat_, this.projection_, squaredTolerance);
|
||||
goog.asserts.assert(flatCoordinates.length > 0);
|
||||
var lineString = goog.isDef(this.meridians_[index]) ?
|
||||
this.meridians_[index] : new ol.geom.LineString(null);
|
||||
lineString.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates);
|
||||
return lineString;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @return {Array.<ol.geom.LineString>} The meridians.
|
||||
* @api
|
||||
*/
|
||||
ol.Graticule.prototype.getMeridians = function() {
|
||||
return this.meridians_;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {number} lat Latitude.
|
||||
* @param {number} squaredTolerance Squared tolerance.
|
||||
* @return {ol.geom.LineString} The parallel line string.
|
||||
* @param {number} index Index.
|
||||
* @private
|
||||
*/
|
||||
ol.Graticule.prototype.getParallel_ = function(lat, squaredTolerance, index) {
|
||||
goog.asserts.assert(lat >= this.minLat_);
|
||||
goog.asserts.assert(lat <= this.maxLat_);
|
||||
var flatCoordinates = ol.geom.flat.geodesic.parallel(lat,
|
||||
this.minLon_, this.maxLon_, this.projection_, squaredTolerance);
|
||||
goog.asserts.assert(flatCoordinates.length > 0);
|
||||
var lineString = goog.isDef(this.parallels_[index]) ?
|
||||
this.parallels_[index] : new ol.geom.LineString(null);
|
||||
lineString.setFlatCoordinates(ol.geom.GeometryLayout.XY, flatCoordinates);
|
||||
return lineString;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @return {Array.<ol.geom.LineString>} The parallels.
|
||||
* @api
|
||||
*/
|
||||
ol.Graticule.prototype.getParallels = function() {
|
||||
return this.parallels_;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {ol.render.Event} e Event.
|
||||
* @private
|
||||
*/
|
||||
ol.Graticule.prototype.handlePostCompose_ = function(e) {
|
||||
var vectorContext = e.vectorContext;
|
||||
var frameState = e.frameState;
|
||||
var extent = frameState.extent;
|
||||
var viewState = frameState.viewState;
|
||||
var center = viewState.center;
|
||||
var projection = viewState.projection;
|
||||
var resolution = viewState.resolution;
|
||||
var pixelRatio = frameState.pixelRatio;
|
||||
var squaredTolerance =
|
||||
resolution * resolution / (4 * pixelRatio * pixelRatio);
|
||||
|
||||
var updateProjectionInfo = goog.isNull(this.projection_) ||
|
||||
!ol.proj.equivalent(this.projection_, projection);
|
||||
|
||||
if (updateProjectionInfo) {
|
||||
this.updateProjectionInfo_(projection);
|
||||
}
|
||||
|
||||
this.createGraticule_(extent, center, resolution, squaredTolerance);
|
||||
|
||||
// Draw the lines
|
||||
vectorContext.setFillStrokeStyle(null, this.strokeStyle_);
|
||||
var i, l, line;
|
||||
for (i = 0, l = this.meridians_.length; i < l; ++i) {
|
||||
line = this.meridians_[i];
|
||||
vectorContext.drawLineStringGeometry(line, null);
|
||||
}
|
||||
for (i = 0, l = this.parallels_.length; i < l; ++i) {
|
||||
line = this.parallels_[i];
|
||||
vectorContext.drawLineStringGeometry(line, null);
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {ol.proj.Projection} projection Projection.
|
||||
* @private
|
||||
*/
|
||||
ol.Graticule.prototype.updateProjectionInfo_ = function(projection) {
|
||||
goog.asserts.assert(!goog.isNull(projection));
|
||||
|
||||
var extent = projection.getExtent();
|
||||
var worldExtent = projection.getWorldExtent();
|
||||
var maxLat = worldExtent[3];
|
||||
var maxLon = worldExtent[2];
|
||||
var minLat = worldExtent[1];
|
||||
var minLon = worldExtent[0];
|
||||
|
||||
goog.asserts.assert(!goog.isNull(extent));
|
||||
goog.asserts.assert(goog.isDef(maxLat));
|
||||
goog.asserts.assert(goog.isDef(maxLon));
|
||||
goog.asserts.assert(goog.isDef(minLat));
|
||||
goog.asserts.assert(goog.isDef(minLon));
|
||||
|
||||
this.maxLat_ = maxLat;
|
||||
this.maxLon_ = maxLon;
|
||||
this.minLat_ = minLat;
|
||||
this.minLon_ = minLon;
|
||||
|
||||
var epsg4326Projection = ol.proj.get('EPSG:4326');
|
||||
|
||||
this.fromLonLatTransform_ = ol.proj.getTransform(
|
||||
epsg4326Projection, projection);
|
||||
|
||||
this.toLonLatTransform_ = ol.proj.getTransform(
|
||||
projection, epsg4326Projection);
|
||||
|
||||
this.projectionCenterLonLat_ = this.toLonLatTransform_(
|
||||
ol.extent.getCenter(extent));
|
||||
|
||||
this.projection_ = projection;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {ol.Map} map Map.
|
||||
* @api
|
||||
*/
|
||||
ol.Graticule.prototype.setMap = function(map) {
|
||||
if (!goog.isNull(this.map_)) {
|
||||
this.map_.un(ol.render.EventType.POSTCOMPOSE,
|
||||
this.handlePostCompose_, this);
|
||||
this.map_.render();
|
||||
}
|
||||
if (!goog.isNull(map)) {
|
||||
map.on(ol.render.EventType.POSTCOMPOSE,
|
||||
this.handlePostCompose_, this);
|
||||
map.render();
|
||||
}
|
||||
this.map_ = map;
|
||||
};
|
||||
@@ -23,7 +23,8 @@ ol.proj.EPSG3857_ = function(code) {
|
||||
code: code,
|
||||
units: ol.proj.Units.METERS,
|
||||
extent: ol.proj.EPSG3857.EXTENT,
|
||||
global: true
|
||||
global: true,
|
||||
worldExtent: ol.proj.EPSG3857.WORLD_EXTENT
|
||||
});
|
||||
};
|
||||
goog.inherits(ol.proj.EPSG3857_, ol.proj.Projection);
|
||||
@@ -61,6 +62,13 @@ ol.proj.EPSG3857.EXTENT = [
|
||||
];
|
||||
|
||||
|
||||
/**
|
||||
* @const
|
||||
* @type {ol.Extent}
|
||||
*/
|
||||
ol.proj.EPSG3857.WORLD_EXTENT = [-180, -85, 180, 85];
|
||||
|
||||
|
||||
/**
|
||||
* Lists several projection codes with the same meaning as EPSG:3857.
|
||||
*
|
||||
|
||||
@@ -26,7 +26,8 @@ ol.proj.EPSG4326_ = function(code, opt_axisOrientation) {
|
||||
units: ol.proj.Units.DEGREES,
|
||||
extent: ol.proj.EPSG4326.EXTENT,
|
||||
axisOrientation: opt_axisOrientation,
|
||||
global: true
|
||||
global: true,
|
||||
worldExtent: ol.proj.EPSG4326.EXTENT
|
||||
});
|
||||
};
|
||||
goog.inherits(ol.proj.EPSG4326_, ol.proj.Projection);
|
||||
|
||||
@@ -86,6 +86,13 @@ ol.proj.Projection = function(options) {
|
||||
*/
|
||||
this.extent_ = goog.isDef(options.extent) ? options.extent : null;
|
||||
|
||||
/**
|
||||
* @private
|
||||
* @type {ol.Extent}
|
||||
*/
|
||||
this.worldExtent_ = goog.isDef(options.worldExtent) ?
|
||||
options.worldExtent : null;
|
||||
|
||||
/**
|
||||
* @private
|
||||
* @type {string}
|
||||
@@ -148,6 +155,16 @@ ol.proj.Projection.prototype.getMetersPerUnit = function() {
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Get the world extent for this projection.
|
||||
* @return {ol.Extent} Extent.
|
||||
* @api
|
||||
*/
|
||||
ol.proj.Projection.prototype.getWorldExtent = function() {
|
||||
return this.worldExtent_;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Get the axis orientation of this projection.
|
||||
* Example values are:
|
||||
@@ -198,6 +215,17 @@ ol.proj.Projection.prototype.setExtent = function(extent) {
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Set the world extent for this projection.
|
||||
* @param {ol.Extent} worldExtent World extent
|
||||
* [minlon, minlat, maxlon, maxlat].
|
||||
* @api
|
||||
*/
|
||||
ol.proj.Projection.prototype.setWorldExtent = function(worldExtent) {
|
||||
this.worldExtent_ = worldExtent;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Get the resolution of the point in degrees. For projections with degrees as
|
||||
* the unit this will simply return the provided resolution. For other
|
||||
|
||||
30
test/spec/ol/graticule.test.js
Normal file
30
test/spec/ol/graticule.test.js
Normal file
@@ -0,0 +1,30 @@
|
||||
goog.provide('ol.test.Graticule');
|
||||
|
||||
describe('ol.Graticule', function() {
|
||||
var graticule;
|
||||
|
||||
beforeEach(function() {
|
||||
graticule = new ol.Graticule({
|
||||
map: new ol.Map({})
|
||||
});
|
||||
});
|
||||
|
||||
describe('#createGraticule', function() {
|
||||
it('creates the graticule', function() {
|
||||
var extent = [-25614353.926475704, -7827151.696402049,
|
||||
25614353.926475704, 7827151.696402049];
|
||||
var projection = ol.proj.get('EPSG:3857');
|
||||
var resolution = 39135.75848201024;
|
||||
var squaredTolerance = resolution * resolution / 4.0;
|
||||
graticule.updateProjectionInfo_(projection);
|
||||
graticule.createGraticule_(extent, [0, 0], resolution, squaredTolerance);
|
||||
expect(graticule.getMeridians().length).to.be(13);
|
||||
expect(graticule.getParallels().length).to.be(3);
|
||||
});
|
||||
});
|
||||
|
||||
});
|
||||
|
||||
goog.require('ol.Graticule');
|
||||
goog.require('ol.Map');
|
||||
goog.require('ol.proj');
|
||||
Reference in New Issue
Block a user