stoqs/static/OpenLayers-2.11/examples/resize-features.html

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    <title>OpenLayers Resize Features Example</title>
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    <style type="text/css">
        p {
            width: 500px;
        }
    </style>
    <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", 
                    "http://vmap0.tiles.osgeo.org/wms/vmap0", {layers: 'basic'} );
            map.addLayer(layer);
            
            var style_blue = OpenLayers.Util.extend({}, OpenLayers.Feature.Vector.style['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));
                pointList.push(newPoint);
            }
            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)));
                pointList.push(newPoint);
            }
            pointList.push(pointList[0]);
            
            var linearRing = new OpenLayers.Geometry.LinearRing(pointList);
            polygonFeature = new OpenLayers.Feature.Vector(
                new OpenLayers.Geometry.Polygon([linearRing]));
                
            
            map.addLayer(vectorLayer);
            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);
            vectorLayer.redraw();
        }

    </script>
  </head>
  <body onload="init()">
    <h1 id="title">Resize Features Programatically</h1>
    <div id="tags">
        vector, feature, resizing, resize
    </div>    
    <p id="shortdesc">
      Demonstration of how to use the geometry resize methods to
      change feature sizes programatically.
    </p>  
    <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>.
  </body>
</html>