diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/d3/src/chart/qq.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/chart/qq.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,245 @@
+// Based on http://vis.stanford.edu/protovis/ex/qqplot.html
+d3.chart.qq = function() {
+  var width = 1,
+      height = 1,
+      duration = 0,
+      domain = null,
+      tickFormat = null,
+      n = 100,
+      x = d3_chart_qqX,
+      y = d3_chart_qqY;
+
+  // For each small multiple…
+  function qq(g) {
+    g.each(function(d, i) {
+      var g = d3.select(this),
+          qx = d3_chart_qqQuantiles(n, x.call(this, d, i)),
+          qy = d3_chart_qqQuantiles(n, y.call(this, d, i)),
+          xd = domain && domain.call(this, d, i) || [d3.min(qx), d3.max(qx)], // new x-domain
+          yd = domain && domain.call(this, d, i) || [d3.min(qy), d3.max(qy)], // new y-domain
+          x0, // old x-scale
+          y0; // old y-scale
+
+      // Compute the new x-scale.
+      var x1 = d3.scale.linear()
+          .domain(xd)
+          .range([0, width]);
+
+      // Compute the new y-scale.
+      var y1 = d3.scale.linear()
+          .domain(yd)
+          .range([height, 0]);
+
+      // Retrieve the old scales, if this is an update.
+      if (this.__chart__) {
+        x0 = this.__chart__.x;
+        y0 = this.__chart__.y;
+      } else {
+        x0 = d3.scale.linear().domain([0, Infinity]).range(x1.range());
+        y0 = d3.scale.linear().domain([0, Infinity]).range(y1.range());
+      }
+
+      // Stash the new scales.
+      this.__chart__ = {x: x1, y: y1};
+
+      // Update diagonal line.
+      var diagonal = g.selectAll("line.diagonal")
+          .data([null]);
+
+      diagonal.enter().append("svg:line")
+          .attr("class", "diagonal")
+          .attr("x1", x1(yd[0]))
+          .attr("y1", y1(xd[0]))
+          .attr("x2", x1(yd[1]))
+          .attr("y2", y1(xd[1]));
+
+      diagonal.transition()
+          .duration(duration)
+          .attr("x1", x1(yd[0]))
+          .attr("y1", y1(xd[0]))
+          .attr("x2", x1(yd[1]))
+          .attr("y2", y1(xd[1]));
+
+      // Update quantile plots.
+      var circle = g.selectAll("circle")
+          .data(d3.range(n).map(function(i) {
+            return {x: qx[i], y: qy[i]};
+          }));
+
+      circle.enter().append("svg:circle")
+          .attr("class", "quantile")
+          .attr("r", 4.5)
+          .attr("cx", function(d) { return x0(d.x); })
+          .attr("cy", function(d) { return y0(d.y); })
+          .style("opacity", 1e-6)
+        .transition()
+          .duration(duration)
+          .attr("cx", function(d) { return x1(d.x); })
+          .attr("cy", function(d) { return y1(d.y); })
+          .style("opacity", 1);
+
+      circle.transition()
+          .duration(duration)
+          .attr("cx", function(d) { return x1(d.x); })
+          .attr("cy", function(d) { return y1(d.y); })
+          .style("opacity", 1);
+
+      circle.exit().transition()
+          .duration(duration)
+          .attr("cx", function(d) { return x1(d.x); })
+          .attr("cy", function(d) { return y1(d.y); })
+          .style("opacity", 1e-6)
+          .remove();
+
+      var xformat = tickFormat || x1.tickFormat(4),
+          yformat = tickFormat || y1.tickFormat(4),
+          tx = function(d) { return "translate(" + x1(d) + "," + height + ")"; },
+          ty = function(d) { return "translate(0," + y1(d) + ")"; };
+
+      // Update x-ticks.
+      var xtick = g.selectAll("g.x.tick")
+          .data(x1.ticks(4), function(d) {
+            return this.textContent || xformat(d);
+          });
+
+      var xtickEnter = xtick.enter().append("svg:g")
+          .attr("class", "x tick")
+          .attr("transform", function(d) { return "translate(" + x0(d) + "," + height + ")"; })
+          .style("opacity", 1e-6);
+
+      xtickEnter.append("svg:line")
+          .attr("y1", 0)
+          .attr("y2", -6);
+
+      xtickEnter.append("svg:text")
+          .attr("text-anchor", "middle")
+          .attr("dy", "1em")
+          .text(xformat);
+
+      // Transition the entering ticks to the new scale, x1.
+      xtickEnter.transition()
+          .duration(duration)
+          .attr("transform", tx)
+          .style("opacity", 1);
+
+      // Transition the updating ticks to the new scale, x1.
+      xtick.transition()
+          .duration(duration)
+          .attr("transform", tx)
+          .style("opacity", 1);
+
+      // Transition the exiting ticks to the new scale, x1.
+      xtick.exit().transition()
+          .duration(duration)
+          .attr("transform", tx)
+          .style("opacity", 1e-6)
+          .remove();
+
+      // Update ticks.
+      var ytick = g.selectAll("g.y.tick")
+          .data(y1.ticks(4), function(d) {
+            return this.textContent || yformat(d);
+          });
+
+      var ytickEnter = ytick.enter().append("svg:g")
+          .attr("class", "y tick")
+          .attr("transform", function(d) { return "translate(0," + y0(d) + ")"; })
+          .style("opacity", 1e-6);
+
+      ytickEnter.append("svg:line")
+          .attr("x1", 0)
+          .attr("x2", 6);
+
+      ytickEnter.append("svg:text")
+          .attr("text-anchor", "end")
+          .attr("dx", "-.5em")
+          .attr("dy", ".3em")
+          .text(yformat);
+
+      // Transition the entering ticks to the new scale, y1.
+      ytickEnter.transition()
+          .duration(duration)
+          .attr("transform", ty)
+          .style("opacity", 1);
+
+      // Transition the updating ticks to the new scale, y1.
+      ytick.transition()
+          .duration(duration)
+          .attr("transform", ty)
+          .style("opacity", 1);
+
+      // Transition the exiting ticks to the new scale, y1.
+      ytick.exit().transition()
+          .duration(duration)
+          .attr("transform", ty)
+          .style("opacity", 1e-6)
+          .remove();
+    });
+  }
+
+  qq.width = function(x) {
+    if (!arguments.length) return width;
+    width = x;
+    return qq;
+  };
+
+  qq.height = function(x) {
+    if (!arguments.length) return height;
+    height = x;
+    return qq;
+  };
+
+  qq.duration = function(x) {
+    if (!arguments.length) return duration;
+    duration = x;
+    return qq;
+  };
+
+  qq.domain = function(x) {
+    if (!arguments.length) return domain;
+    domain = x == null ? x : d3.functor(x);
+    return qq;
+  };
+
+  qq.count = function(z) {
+    if (!arguments.length) return n;
+    n = z;
+    return qq;
+  };
+
+  qq.x = function(z) {
+    if (!arguments.length) return x;
+    x = z;
+    return qq;
+  };
+
+  qq.y = function(z) {
+    if (!arguments.length) return y;
+    y = z;
+    return qq;
+  };
+
+  qq.tickFormat = function(x) {
+    if (!arguments.length) return tickFormat;
+    tickFormat = x;
+    return qq;
+  };
+
+  return qq;
+};
+
+function d3_chart_qqQuantiles(n, values) {
+  var m = values.length - 1;
+  values = values.slice().sort(d3.ascending);
+  return d3.range(n).map(function(i) {
+    return values[~~(i * m / n)];
+  });
+}
+
+function d3_chart_qqX(d) {
+  return d.x;
+}
+
+function d3_chart_qqY(d) {
+  return d.y;
+}