Plan d'étude interactif

<syntaxhighlight lang="javascript" line>

var margin = {top: 20, right: 120, bottom: 20, left: 120}; var width = 1000; var height = 700;

var i = 0,

   duration = 750,
   root;

var tree = d3.layout.tree()

   .size([height, width]);
   /*.size([360, width / 2 - 120]);*/

var diagonal = d3.svg.diagonal()

   .projection(function(d) { return [d.y, d.x]; });

var svg = d3.select("body").append("svg")

   .attr("width", width + margin.right + margin.left)
   .attr("height", height + margin.top + margin.bottom)
 .append("g")
   .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

// Import lightbox var lightbox;

d3.json("erg.json", function(error, flare) {

 if (error) throw error;

 root = flare;
 root.x0 = height / 2;
 root.y0 = 0;

 function collapse(d) {
   if (d.children) {
     d._children = d.children;
     d._children.forEach(collapse);
     d.children = null;
   }
 }

 root.children.forEach(collapse);
 update(root);

});

d3.select(self.frameElement).style("height", "800px");

function update(source) {

 // Compute the new tree layout.
 var nodes = tree.nodes(root).reverse(),
     links = tree.links(nodes);

 // Normalize for fixed-depth.
 nodes.forEach(function(d) { d.y = d.depth * 180; });

 // Update the nodes…
 var node = svg.selectAll("g.node")
     .data(nodes, function(d) { return d.id || (d.id = ++i); });

 // Enter any new nodes at the parent's previous position.
 var nodeEnter = node.enter().append("g")
     .attr("class", "node")
     .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
     /*.attr("transform", function(d) { return "translate(" + project(d.x, d.y) + ")"; })*/
     .on("click", click);

 nodeEnter.append("circle")
     .attr("r", 1e-6)
     //open lightbox when a node has link and is clicked
     .on("click", function (d) {
       console.log('click! / this =', this, '/ d =', d);
       //open lightbox
       if(d.link){
           d3.event.preventDefault();
           lightbox = lity(d.link);
         }
       // d3
         /*d3.selectAll("circle").filter(function (cd) {return cd == d.parent }).classed('active', true);*/
         activate(this, d);
       })

 nodeEnter.append("text")
     .attr("x", function(d) { return d.children || d._children ? -10 : 10; })
     .attr("dy", ".35em")
     .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
     .text(function(d) { return d.name; })
     .style("fill-opacity", 1e-6);

 // Transition nodes to their new position.
 node.classed("leaf", function(d) { return !d._children; });
 var nodeUpdate = node.transition()
     .duration(duration)
     .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

 nodeUpdate.select("circle")
     .attr("r", 4.5);
     

 nodeUpdate.select("text")
     .style("fill-opacity", 1);

 // Transition exiting nodes to the parent's new position.
 var nodeExit = node.exit().transition()
     .duration(duration)
     .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
     .remove();

 nodeExit.select("circle")
     .attr("r", 1e-6);

 nodeExit.select("text")
     .style("fill-opacity", 1e-6);

 // Update the links…
 var link = svg.selectAll("path.link")
     .data(links, function(d) { return d.target.id; });

 // Enter any new links at the parent's previous position.
 link.enter().insert("path", "g")
     .attr("class", "link")
     .attr("d", function(d) {
       var o = {x: source.x0, y: source.y0};
       return diagonal({source: o, target: o});
     });
     /*.attr("d", function(d) {
       return "M" + project(d.x, d.y)
           + "C" + project(d.x, (d.y + d.parent.y) / 2)
           + " " + project(d.parent.x, (d.y + d.parent.y) / 2)
           + " " + project(d.parent.x, d.parent.y);
     });*/

 // Transition links to their new position.
 link.transition()
     .duration(duration)
     .attr("d", diagonal);

 // Transition exiting nodes to the parent's new position.
 link.exit().transition()
     .duration(duration)
     .attr("d", function(d) {
       var o = {x: source.x, y: source.y};
       return diagonal({source: o, target: o});
     })
     .remove();

 // Stash the old positions for transition.
 nodes.forEach(function(d) {
   d.x0 = d.x;
   d.y0 = d.y;
 });

}

// Toggle children on click. function click(d) {

 if (d.children) {
   d._children = d.children;
   d.children = null;
 } else {
   d.children = d._children;
   d._children = null;
 }
 update(d);

}

function project(x, y) {

 var angle = (x - 90) / 180 * Math.PI, radius = y;
 return [radius * Math.cos(angle), radius * Math.sin(angle)];

}

function activate(elt, d, noclear) {

 // Clear all active classes
 if(noclear == undefined) {
   d3.selectAll("circle.active").classed("active", false);
   d3.selectAll("path.link").classed("active", false);
 }
 // Add active class to elements
   d3.select(elt).classed("active", true);
   console.log('need to activate', d.parent);
   
   d3.selectAll("circle").each(function (cd) {
     if(cd == d.parent){
       activate(this, cd, true);
       d3.select(this).classed('active', true);
     }
   // give "active" class to path between clicked node
   d3.selectAll("path.link").each(function (cd){
     if(cd.target == d){
       d3.select(this).classed('active', true);
     }
   })
 });

}

</syntaxhighlight>