e8960054a9
git-svn-id: http://svn.openlayers.org/trunk/openlayers@12082 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
118 lines
4.9 KiB
HTML
118 lines
4.9 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<title>OpenLayers Vector Styles</title>
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<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
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<link rel="stylesheet" href="style.css" type="text/css">
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<script src="../lib/OpenLayers.js"></script>
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<script type="text/javascript">
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var map;
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function init(){
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map = new OpenLayers.Map('map', {maxResolution:'auto'});
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var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
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"http://vmap0.tiles.osgeo.org/wms/vmap0", {layers: 'basic'} );
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map.addLayer(wms);
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map.setCenter(new OpenLayers.LonLat(0, 0), 0);
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// Strategy 1: Style features based on some attribute.
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// create 50 random features in the northern hemisphere
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// give them a "type" attribute that will be used to style
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// them by size
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var features = new Array(50);
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for (var i=0; i<features.length; i++) {
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features[i] = new OpenLayers.Feature.Vector(
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new OpenLayers.Geometry.Point(
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(360 * Math.random()) - 180, 90 * Math.random()
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), {
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type: 5 + parseInt(5 * Math.random())
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}
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);
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}
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// allow testing of specific renderers via "?renderer=Canvas", etc
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var renderer = OpenLayers.Util.getParameters(window.location.href).renderer;
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renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers;
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// create the layer styleMap with a simple symbolizer template
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var layer1 = new OpenLayers.Layer.Vector('Points', {
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styleMap: new OpenLayers.StyleMap({
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pointRadius: "${type}", // based on feature.attributes.type
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fillColor: "#666666"
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}),
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renderers: renderer
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});
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layer1.addFeatures(features);
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// Strategy 2: Style features based on something besides attributes.
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// create 50 random features in the southern hemisphere
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var features = new Array(50);
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for (var i=0; i<features.length; i++) {
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features[i] = new OpenLayers.Feature.Vector(
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new OpenLayers.Geometry.Point(
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(360 * Math.random()) - 180, -90 * Math.random()
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), {
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type: 5 + parseInt(5 * Math.random())
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}
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);
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}
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// create the layer styleMap by giving the default style a context
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var colors = ["red", "green", "blue"];
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var context = {
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getColor: function(feature) {
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var region = parseInt((feature.geometry.x + 180) / 120);
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return colors[region];
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},
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getSize: function(feature) {
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return feature.attributes["type"] / map.getResolution() * .703125;
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}
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};
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var template = {
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pointRadius: "${getSize}", // using context.getSize(feature)
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fillColor: "${getColor}" // using context.getColor(feature)
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};
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var style = new OpenLayers.Style(template, {context: context});
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var layer2 = new OpenLayers.Layer.Vector('Points', {
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styleMap: new OpenLayers.StyleMap(style),
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renderers: renderer
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});
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layer2.addFeatures(features);
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map.addLayers([layer1, layer2]);
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}
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</script>
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</head>
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<body onload="init()">
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<h1 id="title">Feature Styles Example</h1>
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<div id="tags">
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vector, feature, stylemap
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</div>
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<p id="shortdesc">
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To style features with a custom function that evaluates each feature, use
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the context option of an OpenLayers.Style object. If the context object
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contains a function and this function is referenced in a symbolizer, the
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function will be called with the feature as an argument..
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</p>
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<div id="map" class="smallmap"></div>
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<div id="docs">
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<p>Features in the northern hemisphere are styled according to their
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"type" attribute. This is accomplished with a simple template that
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is evaluated with the feature attributes as context.</p>
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<p>Features in the sourthern hemisphere are styled according to a
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combination of their attributes and non-attribute properties. This
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is accomplished using an advanced template that calls functions
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on the context object passed to the Style constructor.</p>
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</div>
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</body>
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</html>
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