Tips on incorporating variable tension feature into D3 hierarchical edge bundling

I found a d3 sample on hierarchical edge bundling that I am experimenting with -

My main focus is how to add tension functionality to the example provided at the following link (code can be found here):

While I have reviewed the code in the first link, I am struggling to identify which parts attribute to the desired interactivity. However, upon reviewing the second link, I believe that the following code snippet could be important. Could you please assist me?

var line = d3.svg.line.radial()
                .interpolate("bundle")
                .tension(.85)
                .radius(function (d) {
                     return d.y;
                })      
                .angle(function (d) {
                     return d.x / 180 * Math.PI;
                });

Answer №1

Looking at the code snippet provided in the first link:

One key requirement is to have an input element present on the webpage

<input style="position:relative;top:3px;" type="range" min="0" max="100" value="85">

Upon initializing the view, it is essential to listen for changes in the input and adjust the tension parameter accordingly:

d3.select("input[type=range]").on("change", function() {
  line.tension(this.value / 100);
  // additional adjustments required (refer below)
});

In addition to this, similar to how it is implemented in the initial example with different variable names, you will also need to update all the paths based on the new value within the input change event handler. Your implementation might resemble the following (though it may require some experimenting):

link.attr("d", line);

Answer №2

line.tension(this.value / 100) does not have the same functionality in d3.v4. When attempted, it will result in an error message:

line.tension is not a function

To resolve this issue:

Follow meetamit's suggestion by adding an input tag,

<input style="position:relative;top:3px;" type="range" min="0" max="100" value="85">

Then, within your

d3.json("flare.json", function (error, classes) {}
function

insert the following code:

d3.select("input[type=range]").on("change", function () {
   line.curve(d3.curveBundle.beta(this.value / 100));
   link.attr("d", line);
});

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