Zooming bar-graph with d3.js - d3.js

Question

I am trying to create a bar graph with a time scale where its possible to zoom into any time period. I was able to create the zooming functionality for my x-axis(time scale) however my data (in this case rects) doesn't zoom along with my axis.
Here is a simplified version of my graph: http://jsfiddle.net/gorkem/Mf457/5/embedded/result/
As you can see I can zoom in to my x-axis but the bars do not zoom along.
and here is the jfiddle link: http://jsfiddle.net/gorkem/Mf457/6/
var y = d3.scale.linear().domain([0, max_val]).range([graph_height, 0]);
var x = d3.time.scale().domain([minDate, maxDate]).range([0, graph_width]);
var chart = d3.select(location).append("svg")
.attr("class", "chart")
.attr("width", graph_width+20)
.attr("height", graph_height+20)
.call(d3.behavior.zoom().x(x).scaleExtent([1, 8]).on("zoom", zoom));
var lines = chart.selectAll("line");
var lines_y = lines
.data(x.ticks(5))
.enter().append("line")
.attr("x1", x)
.attr("x2", x)
.attr("y1", function (d) {return graph_height - 20 - d;})
.attr("y2", graph_height)
.style("stroke", "#ccc");
var lines_x = lines
.data(y.ticks(10))
.enter().append("line")
.attr("x1", 0)
.attr("x2", graph_width)
.attr("y1", y)
.attr("y2", y)
.style("stroke", "#ccc");
xAxis = d3.svg.axis().scale(x);
yAxis = d3.svg.axis().scale(y).orient("left");
chart.append("svg:g")
.attr("class", "xaxis")
.attr("transform","translate(0,300)")
.call(xAxis);
chart.append("svg:g")
.attr("class", "yaxis")
.attr("transform", "translate(25,0)")
.call(yAxis);
var rect = chart.selectAll("rect")
.data(data)
.enter().append("rect")
.attr("x", function (d,i) {return x(new Date(d["date"]))+20; })
.attr("y", function (d,i) { return graph_height - (d["num"] *v_scale);})
.attr("width", x(new Date(data[1]["date"])))
.attr("height", function (d,i) {return d["num"]*v_scale;});
rect.call(d3.behavior.zoom().x(x).scaleExtent([1, 8]).on("zoom", zoom));
function zoom() {
chart.select(".xaxis").call(xAxis);
chart.select(".yaxis").call(yAxis);
}
}
I feel like I should be adding more functionality to my zoom function for the function to be effective on bars(rects). I would really appreciate any help.

Answer 1

Using 'selectAll', I've applied the scaling and translation to each bar respectively, restricting both scale and translation to the x-axis only.
function zoom() {
chart.select(".xaxis").call(xAxis);
chart.select(".yaxis").call(yAxis);
chart.selectAll(".chart rect").attr("transform", "translate(" + d3.event.translate[0] + ",0)scale(" + d3.event.scale + ", 1)");
}
This works equally well with a single path element, which is what I was trying to figure out when I stumbled upon your question.

Answer 2

I'm wondering the same thing, so at least know you're in good company. Here's my current approach. First of all, I can't generate a plot from your code and the links don't send me to anything useful -- no chart renders. So I can't help with your specific problem. However, there is an example that has zoomable rectangles here: http://bl.ocks.org/1962173. I'm currently going through it and deleting unnecessary elements and seeing if I can make it work. Hopefully this helps!