Ch. 5, Fig. 16 - D3.js in Action

This is the code for Chapter 5, Figure 16 from D3.js in Action demonstrating d3.behavior.zoom(). Click and drag the canvas to see more of the dendrogram.

<html>
<head>
  <title>D3 in Action Chapter 5 - Example 7</title>
  <meta charset="utf-8" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
</head>
<style>
  svg {
    height: 500px;
    width: 500px;
    border: 1px solid gray;
  }
  
</style>
<body>

<div id="viz">
  <svg>
  </svg>
</div>
<div id="controls" />
</body>
  <footer>
    
<script>
    d3.json("tweets.json",function(error,data) {dataViz(data.tweets)});

function dataViz(incData) {

nestedTweets = d3.nest()
      .key(function (el) {return el.user})
      .entries(incData);

packableTweets = {id: "root", values: nestedTweets}

var depthScale = d3.scale.category10([0,1,2]);

treeChart = d3.layout.tree();
      treeChart.size([500,500])
      .children(function(d) {return d.values});
      
     var linkGenerator = d3.svg.diagonal();
     
     linkGenerator
     .projection(function (d) {return [d.y, d.x]})

d3.select("svg")
      .append("g")
      .attr("class", "treeG")
      .selectAll("g")
      .data(treeChart(packableTweets))
      .enter()
      .append("g")
      .attr("class", "node")
      .attr("transform", function(d) {return "translate(" +d.y+","+d.x+")"});
      
      d3.selectAll("g.node")
      .append("circle")
      .attr("r", 10)
      .style("fill", function(d) {return depthScale(d.depth)})
      .style("stroke", "white")
      .style("stroke-width", "2px");
      
      d3.selectAll("g.node")
      .append("text")
      .text(function(d) {return d.id || d.key || d.content})
      
      d3.select("g.treeG").selectAll("path")
      .data(treeChart.links(treeChart(packableTweets)))
      .enter().insert("path","g")
      .attr("d", linkGenerator)
      .style("fill", "none")
      .style("stroke", "black")
      .style("stroke-width", "2px");
      
      treeZoom = d3.behavior.zoom();
      treeZoom.on("zoom", zoomed);
      d3.select("svg").call(treeZoom)
      
      function zoomed() {
        var zoomTranslate = treeZoom.translate();
        d3.select("g.treeG").attr("transform", "translate("+zoomTranslate[0]+","+zoomTranslate[1]+")")
      }
    }
</script>
  </footer>

</html>

https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js