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symbolizers-fill-stroke-graphic.html
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symbolizers-fill-stroke-graphic.html
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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 Fill, Stroke, and Graphic Example</title>
<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
<link rel="stylesheet" href="style.css" type="text/css">
<script src="../lib/OpenLayers.js" type="text/javascript"></script>
<script type="text/javascript">
var map;
function init() {
map = new OpenLayers.Map('map');
var layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"http://vmap0.tiles.osgeo.org/wms/vmap0", {layers: 'basic'} );
map.addLayer(layer);
// allow testing of specific renderers via "?renderer=Canvas", etc
var renderer = OpenLayers.Util.getParameters(window.location.href).renderer;
renderer = (renderer) ? [renderer] : OpenLayers.Layer.Vector.prototype.renderers;
var vectorLayer = new OpenLayers.Layer.Vector("Simple Geometry", {
styleMap: new OpenLayers.StyleMap({
'default': new OpenLayers.Style(null, {
rules: [
new OpenLayers.Rule({
symbolizer: {
graphic: false,
label: "Label for invisible point",
labelSelect: true,
fontStyle: "italic"
},
filter: new OpenLayers.Filter.Comparison({
type: "==",
property: "topic",
value: "point_invisible"
})
}),
new OpenLayers.Rule({
symbolizer: {
stroke: true,
fill: true,
label: "Polygon with stroke and fill defaults"
},
filter: new OpenLayers.Filter.Comparison({
type: "==",
property: "topic",
value: "polygon_defaults"
})
}),
new OpenLayers.Rule({
symbolizer: {
stroke: true,
fill: false,
label: "Point without fill",
labelAlign: "rb",
fontColor: "#ff0000",
fontOpacity: 0.4
},
filter: new OpenLayers.Filter.Comparison({
type: "==",
property: "topic",
value: "point_nofill"
})
})
]
})
}),
renderers: renderer
});
// create a point feature
var point = new OpenLayers.Geometry.Point(-111.04, 45.68);
var pointFeature = new OpenLayers.Feature.Vector(point);
pointFeature.attributes = {
topic: "point_invisible"
};
// create a polygon feature from a linear ring of points
var pointList = [];
for(var p=0; p<6; ++p) {
var a = p * (2 * Math.PI) / 7;
var r = Math.random(1) + 1;
var newPoint = new OpenLayers.Geometry.Point(point.x + 5 + (r * Math.cos(a)),
point.y + 5 + (r * Math.sin(a)));
pointList.push(newPoint);
}
pointList.push(pointList[0]);
var linearRing = new OpenLayers.Geometry.LinearRing(pointList);
var polygonFeature = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Polygon([linearRing]));
polygonFeature.attributes = {
topic: "polygon_defaults"
};
multiFeature = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Collection([
new OpenLayers.Geometry.LineString([
new OpenLayers.Geometry.Point(-105,40),
new OpenLayers.Geometry.Point(-95,45)
]),
new OpenLayers.Geometry.Point(-105, 40)
]),
{
topic: "point_nofill"
});
map.addLayer(vectorLayer);
vectorLayer.drawFeature(multiFeature);
map.setCenter(new OpenLayers.LonLat(point.x, point.y), 4);
vectorLayer.addFeatures([pointFeature, polygonFeature, multiFeature]);
var select = new OpenLayers.Control.SelectFeature(vectorLayer, {
selectStyle: OpenLayers.Util.extend(
{fill: true, stroke: true},
OpenLayers.Feature.Vector.style["select"])
});
map.addControl(select);
select.activate();
}
</script>
</head>
<body onload="init()">
<h1 id="title">OpenLayers Example</h1>
<div id="tags">
vector, feature, symbolizer, filter, comparison, labeling
</div>
<p id="shortdesc">
Demonstrate fill, stroke, and graphic property of symbolizers.
</p>
<div id="map" class="smallmap"></div>
<div id="docs">
This example shows how to use symbolizers with defaults for stroke, fill, and graphic.
This also allows to create labels for a feature without the feature rendered. Click on
the label in the middle to see selection of features with labelSelect set to true.
</div>
</body>
</html>