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Add tilePixelRatio option to ol.source.XYZ

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This commit is contained in:
Petr Pridal
2014-07-06 01:30:05 +02:00
committed by Éric Lemoine
parent aafa578805
commit 1a933febcd
4 changed files with 105 additions and 0 deletions
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52
examples/xyz-retina.html Normal file
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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="chrome=1">
<meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
<link rel="stylesheet" href="../css/ol.css" type="text/css">
<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap.min.css" type="text/css">
<link rel="stylesheet" href="../resources/layout.css" type="text/css">
<link rel="stylesheet" href="../resources/bootstrap/css/bootstrap-responsive.min.css" type="text/css">
<title>XYZ Retina tiles example</title>
</head>
<body>
<div class="navbar navbar-inverse navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<a class="brand" href="./"><img src="../resources/logo.png"> OpenLayers 3 Examples</a>
</div>
</div>
</div>
<div class="container-fluid">
<div class="row-fluid">
<div class="span12">
<div id="map" class="map"></div>
</div>
</div>
<div class="row-fluid">
<div class="span12">
<h4 id="title">XYZ with Retina tiles example</h4>
<p id="shortdesc">Example of Retina / HiDPI mercator tiles (512x512px) available as XYZ.</p>
<div id="docs">
<p>The ol.source.XYZ must contain <code>tilePixelRatio</code> parameter. The tiles were prepared from a GeoTIFF file with <a href="http://www.maptiler.com/">MapTiler</a>.</p>
<p>See the <a href="xyz-retina.js" target="_blank">xyz-retina.js source</a> for details on how this is done.</p>
</div>
<div id="tags">retina, hidpi, xyz, maptiler, @2x, devicePixelRatio</div>
</div>
</div>
</div>
<script src="jquery.min.js" type="text/javascript"></script>
<script src="../resources/example-behaviour.js" type="text/javascript"></script>
<script src="loader.js?id=xyz-retina" type="text/javascript"></script>
</body>
</html>

41
examples/xyz-retina.js Normal file
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goog.require('ol.Attribution');
goog.require('ol.Map');
goog.require('ol.View');
goog.require('ol.layer.Tile');
goog.require('ol.proj');
goog.require('ol.source.OSM');
goog.require('ol.source.XYZ');
var attribution = new ol.Attribution({
html: 'Tiles rendered with <a href="http://www.maptiler.com/"> &copy; USGS'
});
var mapMinZoom = 1;
var mapMaxZoom = 15;
var mapExtent = [-112.261791, 35.983744, -112.113981, 36.132062];
var map = new ol.Map({
target: 'map',
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}),
new ol.layer.Tile({
source: new ol.source.XYZ({
url: 'http://tileserver.maptiler.com/grandcanyon@2x/{z}/{x}/{y}.png',
tilePixelRatio: 2, // THIS IS IMPORTANT
maxExtent: ol.proj.transformExtent(
mapExtent, 'EPSG:4326', 'EPSG:3857'),
minZoom: mapMinZoom,
maxZoom: mapMaxZoom
})
})
],
view: new ol.View({
projection: 'EPSG:3857',
center: ol.proj.transform([-112.18688965, 36.057944835],
'EPSG:4326', 'EPSG:3857'),
zoom: 12
})
});

11
externs/olx.js
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@@ -4357,6 +4357,7 @@ olx.source.WMTSOptions.prototype.urls;
* maxZoom: (number|undefined),
* minZoom: (number|undefined),
* tileLoadFunction: (ol.TileLoadFunctionType|undefined),
* tilePixelRatio: (number|undefined),
* tileUrlFunction: (ol.TileUrlFunctionType|undefined),
* url: (string|undefined),
* urls: (Array.<string>|undefined),
@@ -4422,6 +4423,16 @@ olx.source.XYZOptions.prototype.minZoom;
olx.source.XYZOptions.prototype.tileLoadFunction;
/**
* The pixel ratio used by the tile service. For example, if the tile
* service advertizes 256px by 256px tiles but actually sends 512px
* by 512px images (for retina/hidpi devices) then `tilePixelRatio`
* should be set to `2`. Default is `1`.
* @type {number|undefined}
*/
olx.source.XYZOptions.prototype.tilePixelRatio;
/**
* Optional function to get tile URL given a tile coordinate and the projection.
* Required if url or urls are not provided.

1
src/ol/source/xyzsource.js
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@@ -35,6 +35,7 @@ ol.source.XYZ = function(options) {
projection: projection,
tileGrid: tileGrid,
tileLoadFunction: options.tileLoadFunction,
tilePixelRatio: options.tilePixelRatio,
tileUrlFunction: ol.TileUrlFunction.nullTileUrlFunction
});