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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<title>OpenLayers Styles Unique Value Styles Example</title>
<link rel="stylesheet" href="openlayers/theme/default/style.css" type="text/css">
<link rel="stylesheet" href="style.css" type="text/css">
<script src="openlayers/OpenLayers.js"></script>
<script type="text/javascript">
var map, layer;
function init(){
map = new OpenLayers.Map('map', {maxResolution:'auto'});
var wms = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"http://vmap0.tiles.osgeo.org/wms/vmap0", {layers: 'basic'} );
map.addLayer(wms);
map.setCenter(new OpenLayers.LonLat(0, 0), 0);
// create 20 random features with a random type attribute. The
// type attribute is a value between 0 and 2.
var features = new Array(20);
for (var i=0; i<20; i++) {
features[i] = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point(Math.random()*360-180, Math.random()*180-90),
{type: parseInt(Math.random()*3)}
);
}
// create a styleMap with a custom default symbolizer
var styleMap = new OpenLayers.StyleMap({
fillOpacity: 1,
pointRadius: 10
});
// create a lookup table with different symbolizers for 0, 1 and 2
var lookup = {
0: {externalGraphic: "openlayers/img/marker-blue.png"},
1: {externalGraphic: "openlayers/img/marker-green.png"},
2: {externalGraphic: "openlayers/img/marker-gold.png"}
};
// add rules from the above lookup table, with the keyes mapped to
// the "type" property of the features, for the "default" intent
styleMap.addUniqueValueRules("default", "type", lookup);
layer = new OpenLayers.Layer.Vector('Points', {
styleMap: styleMap
});
layer.addFeatures(features);
map.addLayer(layer);
// create 20 random features with a random state property.
var features = new Array(20);
var states = [
OpenLayers.State.UNKNOWN,
OpenLayers.State.UPDATE,
OpenLayers.State.DELETE,
OpenLayers.State.INSERT
];
for (var i=0; i<20; i++) {
features[i] = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Point(Math.random()*360-180, Math.random()*180-90)
);
features[i].state = states[parseInt(Math.random()*4)];
}
var context = function(feature) {
return feature;
};
var styleMap = new OpenLayers.StyleMap();
// create a lookup table with different symbolizers for the different
// state values
var lookup = {};
lookup[OpenLayers.State.UNKNOWN] = {fillColor: "green"};
lookup[OpenLayers.State.UPDATE] = {fillColor: "green"};
lookup[OpenLayers.State.DELETE] = {fillColor: "red"};
lookup[OpenLayers.State.INSERT] = {fillColor: "orange"};
styleMap.addUniqueValueRules("default", "state", lookup, context);
layer = new OpenLayers.Layer.Vector('Points', {
styleMap: styleMap
});
layer.addFeatures(features);
map.addLayer(layer);
}
</script>
</head>
<body onload="init()">
<h1 id="title">Unique Value Styles Example</h1>
<div id="tags">
vector, feature, stylemap, uniquevalue, cleanup, light
</div>
<p id="shortdesc">
Shows how to create a style based on unique feature attribute values (markers)
and feature state values (circles).
</p>
<div id="map" class="smallmap"></div>
<div id="docs"></div>
</body>
</html>
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