D3.js linkRadial() Method

Last Updated : 30 Mar, 2023

The d3.linkRadial() method returns a new link generator with radial tangents. It is typically used when the root is centered with the children spreading outwards from the root.

Syntax:

var link = d3.linkRadial()
    .angle(function(d) { return d.x; })
    .radius(function(d) { return d.y; });

Parameters: This function does not take any parameter.

Return Value: This method returns a new link generator.

Example:

HTML

<!DOCTYPE html> 
<html> 
<head> 
    <meta charset="utf-8"> 
  
    <script src= 
        "https://d3js.org/d3.v5.min.js"> 
    </script> 
</head> 
  
<body> 
  
    <h1 style="text-align: center; color: green;"> 
        GeeksforGeeks 
    </h1> 
  
    <h3 style="text-align: center;"> 
        D3.js | linkRadial() Method 
    </h3> 
  
    <center> 
    <svg id="gfg" width="200" height="200"></svg> 
    </center> 
  
    <script> 
  
        var data = [ 
            {source: [100,25], target: [175,175]},  
            {source: [100,25], target: [25,175]}, 
            {source: [100,25], target: [125,175]}, 
            {source: [100,25], target: [75,175]}, 
            {source: [100,25], target: [225,175]}, 
            {source: [100,25], target: [275,175]}, 
            {source: [100,25], target: [125,175]}];  
        
        // Radial link generator 
        var link = d3.linkRadial() 
                    .angle(d => xAngleScale(d[0])) 
                    .radius(d => yRadiusScale(d[1])); 
  
        var xAngleScale =  
        d3.scaleLinear().domain([25,175]).range([(Math.PI, Math.PI *2)]); 
        var yRadiusScale =  
        d3.scaleLinear().domain([25,175]).range([0, 80]); 
        
        //Adding the link paths 
        d3.select("#gfg") 
        .selectAll("path") 
        .data(data) 
        .join("path") 
        .attr("d", link) 
        .classed("link", true) 
        .attr("transform", "translate(100,100)"); 
  
    </script> 
</body> 
  
</html>