--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/examples/calendar/vix.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,65 @@
+var m = [19, 20, 20, 19], // top right bottom left margin
+    w = 960 - m[1] - m[3], // width
+    h = 136 - m[0] - m[2], // height
+    z = 17; // cell size
+
+var day = d3.time.format("%w"),
+    week = d3.time.format("%U"),
+    format = d3.time.format("%Y-%m-%d");
+
+var color = d3.scale.quantile()
+    .range(d3.range(9).reverse());
+
+var svg = d3.select("#chart").selectAll("svg")
+    .data(d3.range(1993, 2011))
+  .enter().append("svg:svg")
+    .attr("width", w + m[1] + m[3])
+    .attr("height", h + m[0] + m[2])
+    .attr("class", "RdYlGn")
+  .append("svg:g")
+    .attr("transform", "translate(" + (m[3] + (w - z * 53) / 2) + "," + (m[0] + (h - z * 7) / 2) + ")");
+
+svg.append("svg:text")
+    .attr("transform", "translate(-6," + z * 3.5 + ")rotate(-90)")
+    .attr("text-anchor", "middle")
+    .text(String);
+
+var rect = svg.selectAll("rect.day")
+    .data(function(d) { return d3.time.days(new Date(d, 0, 1), new Date(d + 1, 0, 1)); })
+  .enter().append("svg:rect")
+    .attr("class", "day")
+    .attr("width", z)
+    .attr("height", z)
+    .attr("x", function(d) { return week(d) * z; })
+    .attr("y", function(d) { return day(d) * z; });
+
+svg.selectAll("path.month")
+    .data(function(d) { return d3.time.months(new Date(d, 0, 1), new Date(d + 1, 0, 1)); })
+  .enter().append("svg:path")
+    .attr("class", "month")
+    .attr("d", monthPath);
+
+d3.csv("vix.csv", function(csv) {
+  var data = d3.nest()
+      .key(function(d) { return d.Date; })
+      .rollup(function(d) { return d[0].Open; })
+      .map(csv);
+
+  color.domain(d3.values(data));
+
+  rect
+      .attr("class", function(d) { return "day q" + color(data[format(d)]) + "-9"; })
+    .append("svg:title")
+      .text(function(d) { return (d = format(d)) + (d in data ? ": " + data[d] : ""); });
+});
+
+function monthPath(t0) {
+  var t1 = new Date(t0.getUTCFullYear(), t0.getUTCMonth() + 1, 0),
+      d0 = +day(t0), w0 = +week(t0),
+      d1 = +day(t1), w1 = +week(t1);
+  return "M" + (w0 + 1) * z + "," + d0 * z
+      + "H" + w0 * z + "V" + 7 * z
+      + "H" + w1 * z + "V" + (d1 + 1) * z
+      + "H" + (w1 + 1) * z + "V" + 0
+      + "H" + (w0 + 1) * z + "Z";
+}