diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/examples/cartogram/cartogram.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/examples/cartogram/cartogram.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,51 @@
+// Ratio of Obese (BMI >= 30) in U.S. Adults, CDC 2008
+var data = [
+  , .187, .198, , .133, .175, .151, , .1, .125, .171, , .172, .133, , .108,
+  .142, .167, .201, .175, .159, .169, .177, .141, .163, .117, .182, .153, .195,
+  .189, .134, .163, .133, .151, .145, .13, .139, .169, .164, .175, .135, .152,
+  .169, , .132, .167, .139, .184, .159, .14, .146, .157, , .139, .183, .16, .143
+];
+
+var svg = d3.select("#chart").append("svg:svg")
+    .attr("width", 960)
+    .attr("height", 500);
+
+d3.json("../data/us-states.json", function(json) {
+  var path = d3.geo.path();
+
+  // A thick black stroke for the exterior.
+  svg.append("svg:g")
+      .attr("class", "black")
+    .selectAll("path")
+      .data(json.features)
+    .enter().append("svg:path")
+      .attr("d", path);
+
+  // A white overlay to hide interior black strokes.
+  svg.append("svg:g")
+      .attr("class", "white")
+    .selectAll("path")
+      .data(json.features)
+    .enter().append("svg:path")
+      .attr("d", path);
+
+  // The polygons, scaled!
+  svg.append("svg:g")
+      .attr("class", "grey")
+    .selectAll("path")
+      .data(json.features)
+    .enter().append("svg:path")
+      .attr("d", path)
+      .attr("transform", function(d) {
+        var centroid = path.centroid(d),
+            x = centroid[0],
+            y = centroid[1];
+        return "translate(" + x + "," + y + ")"
+            + "scale(" + Math.sqrt(data[+d.id] * 5 || 0) + ")"
+            + "translate(" + -x + "," + -y + ")";
+      })
+      .style("stroke-width", function(d) {
+        return 1 / Math.sqrt(data[+d.id] * 5 || 1);
+      });
+
+});