D3 Examples - Resizable Markers

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<!DOCTYPE html>
<html>
  <head>
    <script type="text/javascript" src="https://github.com/simplegeo/polymaps/raw/v2.3.0/polymaps.min.js"></script>
    <script type="text/javascript" src="https://github.com/simplegeo/polymaps/raw/v2.3.0/lib/crimespotting/crimespotting.js"></script>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/protovis/3.3.1/protovis.min.js"></script>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/protovis/3.3.1/protovis.min.js"></script>
    <style type="text/css">
​
@import url("example.css");
@import url("jquery-ui-1.8rc3.custom.css");
​
html, body {
  height: 100%;
  background: #E6E6E6;
}
​
svg {
  display: block;
}
​
.layer circle {
  fill: lightcoral;
  fill-opacity: .5;
  stroke: brown;
}
​
#slider {
  position: absolute;
  top: 10px;
  left: 10px;
  width: 300px;
  display: block;
  background: #ccc;
}
​
.ui-slider {
  font-size: 10px;
  margin-top: 5px;
}
​
.ui-state-focus {
  outline: none;
}
​
    </style>
  </head>
  <body>
    <script type="text/javascript">
​
var po = org.polymaps;
​
var r = 4.5;
​
var map = po.map()
    .container(document.body.appendChild(po.svg("svg")))
    .center({lat: 37.787, lon: -122.228})
    .zoomRange([10, 16])
    .add(po.interact());
​
map.add(po.image()
    .url(po.url("https://{S}tile.cloudmade.com"
    + "/1a1b06b230af4efdbb989ea99e9841af" // https://cloudmade.com/register
    + "/998/256/{Z}/{X}/{Y}.png")
    .hosts(["a.", "b.", "c.", ""])));
​
map.add(geoJson = po.geoJson()
    .url(crimespotting("https://oakland.crimespotting.org"
        + "/crime-data"
        + "?count=100"
        + "&format=json"
        + "&bbox={B}"
        + "&dstart=2010-04-01"
        + "&dend=2010-04-01"))
    .on("show", show)
    .clip(false)
    .scale("fixed")
    .zoom(12));
​
/* Resize the GeoJSON points! */
function show(e) {
  for (var i = 0; i < e.features.length; i++) {
    e.features[i].element.setAttribute("r", r);
  }
}
​
    </script>
    <div id="slider"></div>
    <script type="text/javascript">
​
$("#slider").slider({
  min: 0, max: 1000, value: r * r, slide: function(e, ui) {
    r = Math.sqrt(ui.value);
    geoJson.reshow();
  }
});
​
    </script>
    <span id="copy">
      &copy; 2010
      <a href="https://www.cloudmade.com/">CloudMade</a>,
      <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors,
      <a href="https://creativecommons.org/licenses/by-sa/2.0/">CCBYSA</a>.
    </span>
  </body>
</html>
​
    