Click to zoom in a pie chart using D3 library

548 views
Skip to first unread message

Gao Han

unread,
Jul 16, 2013, 11:45:53 AM7/16/13
to d3...@googlegroups.com

I'm working on a pie chart that has the following functionality:

  • Section will be highlighted when "mouseover" occurred.
  • Section will be zoomed in when "click" is performed.
I have written the following code that is able to do the first job (highlighting). Currently, I'm having a hard time to make the second functionality to work. I tried to select arcs/paths, and to transform its coordinate to zoom in. I also tried to adopt the idea from the following link: http://bl.ocks.org/mbostock/2206590 But I didn't make it to work, Any ideas to solve the problem? Your suggestion is greatly appreciated!
 
 
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
  font: 10px sans-serif;
}
 
.arc path {
  stroke: #fff;
}
 
#code_hierarchy_legend
{
    height:100px;
    font-size:1.4em;
    text-align:center;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var width = 1200,
    height = 700,
    radius = Math.min(width, height) / 3;
 
var color = d3.scale.category20();
var arc = d3.svg.arc()
    .outerRadius(radius - 10)
    .innerRadius(0);
 
var pie = d3.layout.pie()
    .sort(null)
    .value(function(d) { return d.count; });
 
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height)
    .append("g")
    .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
 
d3.csv("data.csv", function(error, data) {
  data.forEach(function(d) {
    d.count = +d.count;
});
 
var g = svg.selectAll(".arc")
      .data(pie(data))
      .enter().append("g")
      .attr("class", "arc")
      .on("mouseover", function(g, i){
             svg.selectAll(".arc").filter(function(d, ii){return ii != i && ii != i;})
             .transition(0)
             .style("opacity", 0.05);           
      })
      .on("mouseout", function(g, i){
             svg.selectAll(".arc").filter(function(d, ii){return ii != i && ii != i;})
             .transition(0)
             .style("opacity", 1);           
      })
      .on("click", clicked);
  
// append paths to 'g'
   var path = g.append("path");
        
         path.attr("d", arc)
                .style("fill", function(d) { return color(d.data.category); });
      
  g.append("text")
      .attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; })
      .attr("dy", ".35em")
      .style("text-anchor", "middle")
      .text(function(d) { return d.data.category +", "+ d.data.count; });
  
   
 // somehow the clicked() function does not work as I expected
  function clicked(){
  console.log("called");
 
     var x, y, k;
     x = 200;
     y = 200;
     k = 4;
    
     g.selectAll("path").classed("active", true);
     g.transition().duration(750)
     .attr("transform", "translate("+width/2+", "+height/2+")scale("+k+")translate")
     .style("stroke", 1.5 / k + "px")
  }
 
</script>
Reply all
Reply to author
Forward
0 new messages