zoom points

app.js

@@ -128,3 +128,9 @@ d3.select('svg').on('click', function(){
     createTable();
     render();
 });
+
+var zoomCallback = function(){
+	d3.select('#points').attr("transform", d3.event.transform);
+}
+var zoom = d3.zoom().on('zoom', zoomCallback);
+d3.select('svg').call(zoom);