Add R-Tree visualisation example
This demonstrates how awful ol.structs.RTree is.
This commit is contained in:
Tom Payne
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examples/rtree.html
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examples/rtree.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>R-Tree 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">R-Tree example</h4>
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<p id="shortdesc">R-Tree example.</p>
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<div id="docs">
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<p>See the <a href="rtree.js" target="_blank">rtree.js source</a> to see how this is done.</p>
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</div>
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<div id="tags">vector, rtree</div>
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</div>
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</div>
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</div>
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<script src="loader.js?id=rtree" type="text/javascript"></script>
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<script src="../resources/example-behaviour.js" type="text/javascript"></script>
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</body>
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</html>
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121
examples/rtree.js
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examples/rtree.js
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// NOCOMPILE
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// FIXME this example dives into private members and will never compile :)
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goog.require('ol.Feature');
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goog.require('ol.Map');
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goog.require('ol.RendererHint');
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goog.require('ol.View2D');
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goog.require('ol.extent');
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goog.require('ol.geom.Point');
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goog.require('ol.geom.Polygon');
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goog.require('ol.layer.Vector');
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goog.require('ol.source.Vector');
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goog.require('ol.structs.RTree');
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goog.require('ol.symbol');
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/**
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* @return {Array.<Array.<ol.Extent>>} Extents at depths.
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*/
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ol.structs.RTree.prototype.getExtentsByDepth = function() {
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var depthFirstSearch =
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/**
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* @param {ol.structs.RTreeNode} node Node.
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* @param {number} depth Depth.
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* @param {Array.<Array.<ol.Extent>>} result Result.
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* @return {Array.<Array.<ol.Extent>>} Result.
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*/
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function(node, depth, result) {
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if (goog.isDef(result[depth])) {
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result[depth].push(node.extent);
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} else {
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result[depth] = [node.extent];
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}
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var nodes = node.nodes;
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if (goog.isDef(nodes)) {
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var i, ii;
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for (i = 0, ii = nodes.length; i < ii; ++i) {
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depthFirstSearch(nodes[i], depth + 1, result);
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}
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}
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return result;
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};
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return depthFirstSearch(this.rootTree_, 0, []);
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};
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var i, ii, j, jj;
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var count = 2000;
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var features = new Array(count);
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var e = 18000000;
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for (i = 0; i < count; ++i) {
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features[i] = new ol.Feature({
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'geometry': new ol.geom.Point(
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[2 * e * Math.random() - e, 2 * e * Math.random() - e])
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});
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}
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var vectorSource = new ol.source.Vector({
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features: features
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});
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var style = {
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image: ol.symbol.renderCircle(3, null, {color: 'red', width: 1})
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};
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var colors = ['red', 'orange', 'yellow', 'blue', 'green', 'indigo', 'violet'];
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var depthStyle = [];
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for (i = 0, ii = colors.length; i < ii; ++i) {
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depthStyle[i] = {
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fill: null,
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image: null,
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stroke: {
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color: colors[i],
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width: (7 - i) / 2
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},
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zIndex: i
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};
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}
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var extentsByDepth = vectorSource.rTree_.getExtentsByDepth();
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var rtreeExtentFeatures = [];
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for (i = 0, ii = extentsByDepth.length; i < ii; ++i) {
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var extents = extentsByDepth[i];
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for (j = 0, jj = extents.length; j < jj; ++j) {
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var extent = extents[j];
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var geometry = new ol.geom.Polygon([[
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ol.extent.getBottomLeft(extent),
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ol.extent.getTopLeft(extent),
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ol.extent.getTopRight(extent),
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ol.extent.getBottomRight(extent)
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]]);
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var feature = new ol.Feature({
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'geometry': geometry,
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'style': depthStyle[i]
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});
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rtreeExtentFeatures.push(feature);
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}
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}
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var vector = new ol.layer.Vector({
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source: vectorSource,
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styleFunction: function(feature) {
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return style;
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}
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});
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var rtree = new ol.layer.Vector({
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source: new ol.source.Vector({
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features: rtreeExtentFeatures
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}),
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styleFunction: function(feature) {
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return feature.get('style');
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}
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});
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var map = new ol.Map({
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layers: [vector, rtree],
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renderer: ol.RendererHint.CANVAS,
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target: 'map',
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view: new ol.View2D({
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center: [0, 0],
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zoom: 2
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})
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});
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