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<!DOCTYPE html>
<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 Resize Features Example</title>
<link rel="stylesheet" href="../theme/default/style.css" type="text/css">
<link rel="stylesheet" href="style.css" type="text/css">
<style type="text/css">
p {
width: 500px;
<script src="../lib/OpenLayers.js"></script>
<script type="text/javascript">
var map, vectorLayer, pointFeature, lineFeature, polygonFeature;
function init(){
map = new OpenLayers.Map('map');
var layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
"", {layers: 'basic'} );
var style_blue = OpenLayers.Util.extend({},['default']);
style_blue.strokeColor = "blue";
style_blue.fillColor = "blue";
var style_green = {
strokeColor: "#339933",
strokeOpacity: 1,
strokeWidth: 3,
pointRadius: 6,
pointerEvents: "visiblePainted"
vectorLayer = new OpenLayers.Layer.Vector("Simple Geometry");
// create a point feature
var point = new OpenLayers.Geometry.Point(-110, 45);
pointFeature = new OpenLayers.Feature.Vector(point, null, style_blue);
// create a line feature from a list of points
var pointList = [];
var newPoint = point;
for(var p=0; p<5; ++p) {
newPoint = new OpenLayers.Geometry.Point(newPoint.x + Math.random(1),
newPoint.y + Math.random(1));
lineFeature = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.LineString(pointList),null,style_green);
// 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 + (r * Math.cos(a)),
point.y + (r * Math.sin(a)));
var linearRing = new OpenLayers.Geometry.LinearRing(pointList);
polygonFeature = new OpenLayers.Feature.Vector(
new OpenLayers.Geometry.Polygon([linearRing]));
map.setCenter(new OpenLayers.LonLat(point.x, point.y), 5);
vectorLayer.addFeatures([pointFeature, lineFeature, polygonFeature]);
var origin = new OpenLayers.Geometry.Point(-111.04, 45.68);
function resizeFeatures(scale) {
pointFeature.geometry.resize(scale, origin);
lineFeature.geometry.resize(scale, origin);
polygonFeature.geometry.resize(scale, origin);
<body onload="init()">
<h1 id="title">Resize Features Programatically</h1>
<div id="tags">
vector, feature, resizing, resize, light
<p id="shortdesc">
Demonstration of how to use the geometry resize methods to
change feature sizes programatically.
<div id="map" class="smallmap"></div>
<p>This example demonstrates how features can be resized. There is not yet
a control built that provides a tool for resizing, but the geometry.resize
method can be accessed to resize programmatically.</p>
<p>Make the features <a href="javascript: resizeFeatures(1.5);">bigger</a>
or <a href="javascript: resizeFeatures(1 / 1.5);">smaller</a>.
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