D3.js ribbon.radius() Function

Last Updated : 24 Aug, 2020

The ribbon.radius() function in D3.js is used to set the radius accessor to the specified function and returns this ribbon generator.

Syntax:

ribbon.radius([radius]);

Parameters: This function accepts a single parameter as mentioned above and described below

radius: This parameter is the function to set the radius accessor.

Return Value: This function returns the ribbon generator.

Below programs illustrate the ribbon.radius() function in D3.js

Example 1:

<!DOCTYPE html>  
<html>  
   
<head>  
    <meta charset="utf-8"> 
    <script src="https://d3js.org/d3.v4.js"></script> 
</head>  
   
<body> 
    <center>  
        <h1 style="color:green;">GeeksForGeeks</h1> 
             
        <h3>D3.js | ribbon.radius() Function</h3> 
        <div id="GFG"></div> 
           
        <script> 
            // Create the svg area 
            var svg = d3.select("#GFG") 
                .append("svg") 
                .attr("width", 340) 
                .attr("height", 340) 
                .append("g") 
                .attr("transform", "translate(170, 170)") 
                           
            // Create input data 
            var data = [[148, 60, 71, 34, 5, 1], 
                [ 10, 80, 80, 12, 34, 53], 
                [175, 16, 68, 0, 0, 3], 
                [13, 9, 69, 76, 35, 4], 
                [51, 60, 71, 34, 5, 1]]; 
                            
            // Give this matrix to d3.chord() 
            var chords = d3.chord()(data) 
                   
            var ribboon = d3.ribbon() 
                // Use of ribbon.radius() function 
                .radius(170); 
               
            svg.datum(chords) 
                .append("g") 
                .selectAll("path") 
                .data(function (d) { return d; }) 
                .enter() 
                .append("path") 
                .attr("d", ribboon) 
                .style("fill", "#ffb357") 
                .style("stroke", "black"); 
        </script>  
    </center> 
</body>  
   
</html> 

Output:

Example 2:

<!DOCTYPE html>  
<html> 
         
<head>  
    <meta charset="utf-8"> 
      
    <script src= "https://d3js.org/d3-color.v1.min.js"> 
    </script>   
    <script src=  
        "https://d3js.org/d3-interpolate.v1.min.js"> 
    </script>   
    <script src=  
        "https://d3js.org/d3-scale-chromatic.v1.min.js"> 
    </script> 
</head>  
    
<body>  
    <center>  
        <h1 style="color:green;">GeeksForGeeks</h1> 
              
        <h3>D3.js | ribbon.radius() Function</h3> 
        <div id="GFG"></div> 
            
        <script> 
            // Create the svg area 
            var svg = d3.select("#GFG") 
                .append("svg") 
                .attr("width", 320) 
                .attr("height", 320) 
                .append("g") 
                .attr("transform", "translate(160, 160)") 
                    
            // Create input data 
            var data = [[0,  58, 71, 89, 16, 28, 68, 0], 
                [0, 19, 51, 0, 20, 60, 61, 71], 
                [80, 10, 16, 145, 0, 80, 45, 0], 
                [0, 10, 13, 9, 90,  94, 0, 0], 
                [0, 0, 0, 0, 0, 0, 0, 0]]; 
                
            // 4 groups, so create a vector of 4 colors 
            var colors = [d3.schemeSet1[7], d3.schemeSet1[6], 
                d3.schemeSet1[5], d3.schemeSet1[4], 
                d3.schemeSet1[3], d3.schemeSet1[2], 
                d3.schemeSet1[1], d3.schemeSet1[0]]; 
    
            // Give this matrix to d3.chord() 
            var chords = d3.chord()(data) 
              
            var rib = d3.ribbon() 
                // Use of ribbon.radius() function 
                .radius(150); 
                  
            svg.datum(chords) 
                .append("g") 
                .selectAll("path") 
                .data(function (d) { return d; }) 
                .enter() 
                .append("path") 
                .attr("d", rib) 
                .style("fill", function (d) {  
                    return (colors[d.source.index]) 
                }) 
                .style("stroke", "black"); 
        </script>  
    </center> 
</body> 
    
</html> 