Merge pull request #329 from nestalk/master

Update d3 definition

d3/d3-tests.ts

@@ -613,3 +613,33 @@ function bivariateAreaChart {
             .text("Temperature (ºF)");
     });
 }
+
+//Example from http://bl.ocks.org/mbostock/1557377
+function dragMultiples {
+    var width = 238,
+    height = 123,
+    radius = 20;
+
+    var drag = d3.behavior.drag()
+        .origin(Object)
+        .on("drag", dragmove);
+
+    var svg = d3.select("body").selectAll("svg")
+        .data(d3.range(16).map(function () { return { x: width / 2, y: height / 2 }; }))
+      .enter().append("svg")
+        .attr("width", width)
+        .attr("height", height);
+
+    svg.append("circle")
+        .attr("r", radius)
+        .attr("cx", function (d) { return d.x; })
+        .attr("cy", function (d) { return d.y; })
+        .call(drag);
+
+    function dragmove(d) {
+        d3.select(this)
+            .attr("cx", d.x = Math.max(radius, Math.min(width - radius, d3.event.x)))
+            .attr("cy", d.y = Math.max(radius, Math.min(height - radius, d3.event.y)));
+    }
+}
+