D3.js ribbon() Function

Last Updated : 26 Aug, 2020

The d3.ribbon() function in D3.js is used to return a constructed new ribbon generator with the default settings.

Syntax:

d3.ribbon();

Parameters: This function does not accept any parameters.

Return Value: This function returns the newly constructed ribbon generator.

Below programs illustrate the d3.ribbon() function in D3.js

Example 1:

HTML

<!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 | d3.ribbon() Function</h3> 
    <div id="GFG"></div> 
    <script> 
      // Create the svg area 
      var svg = d3.select("#GFG") 
          .append("svg") 
          .attr("width", 300) 
          .attr("height", 300) 
          .append("g") 
          .attr("transform", "translate(150,150)"); 
  
      // Create input data 
      var data = [[ 51, 148, 60, 71, 34, 5, 1], 
                  [ 10, 161, 80, 80, 12, 34, 53], 
                  [175,  71, 16, 68, 0, 0, 3], 
                  [ 13, 990,  9, 69, 76, 35, 4], 
                  [ 51, 148, 60, 71, 34, 5, 1]]; 
  
      // Give this matrix to d3.chord() 
      var chords = d3.chord() 
          .padAngle(0.2)  
          .sortSubgroups(d3.descending) 
          .sortChords(d3.descending) 
          (data); 
  
      // Use of d3.ribbon() function 
      var ribboon = d3.ribbon().radius(140);   
  
      svg.datum(chords) 
          .append("g") 
          .selectAll("path") 
          .data(function (d) { return d; }) 
          .enter() 
          .append("path") 
          .attr("d", ribboon) 
          .style("fill", "#449db8") 
          .style("stroke", "black"); 
    </script>  
  </center> 
</body>  
</html>

Output:

Example 2:

HTML

<!DOCTYPE html>  
<html>       
<head>  
  <meta charset="utf-8"> 
  <script src=  
      "https://d3js.org/d3.v4.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 | d3.ribbon() 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], 
                  [ 19, 51, 0, 20, 60, 61, 71], 
                  [ 80, 10, 16, 145, 0, 80, 45], 
                  [ 10, 13,   9, 90,  94, 0, 0], 
                  [ 80, 10, 16, 145, 0, 80, 45], 
                  [ 10, 13,   9, 90,  94, 0, 0]]; 
  
      // 4 groups, so create a vector of 4 colors 
      var colors = [d3.schemeCategory10[0],  
          d3.schemeCategory10[1], 
          d3.schemeCategory10[2], d3.schemeCategory10[3], 
          d3.schemeCategory10[4], d3.schemeCategory10[5], 
          d3.schemeCategory10[6], d3.schemeCategory10[7]]; 
  
      // Give this matrix to d3.chord() 
      var chords = d3.chord() 
          .padAngle(0.175) 
          .sortSubgroups(d3.ascending) 
          (data); 
  
      svg.datum(chords) 
          .append("g") 
          .selectAll("path") 
          .data(function (d) { return d; }) 
          .enter() 
          .append("path") 
          .attr("d", d3.ribbon() 
              .radius(150) 
          ) 
          .style("fill", function (d) {  
              return (colors[d.source.index]) 
          }) 
          .style("stroke", "black"); 
    </script>  
  </center> 
</body> 
</html>