D3.js chord.sortChords() Function

Last Updated : 26 Aug, 2020

The chord.sortChords() function in D3.js is used to set the chord comparator to the specified function or null and returns this chord layout.

Syntax:

chord.sortChords(compare);

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

compare: This parameter is the function to set the chord comparator.

Return Value: This function returns the chord layout.

Below programs illustrate the chord.sortChords() 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 | chord.sortChords() Function</h3> 
    <div id="GFG"></div> 
    <script> 
      // Create the svg area 
      var svg = d3.select("#GFG") 
          .append("svg") 
          .attr("width", 440) 
          .attr("height", 220) 
          .append("g") 
          .attr("transform", "translate(220,220)"); 
  
      // 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], 
                  [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.ascending) 
  
          // Use of chord.sortChords() Function 
          .sortChords(d3.ascending)(data) 
  
      svg.datum(chords) 
          .append("g") 
          .selectAll("g") 
          .data(function (d) { return d.groups; }) 
          .enter() 
          .append("g") 
          .append("path") 
          .style("fill", "purple") 
          .style("stroke", "black") 
          .attr("d", d3.arc() 
              .innerRadius(170) 
              .outerRadius(200) 
              ); 
  
      svg.datum(chords) 
          .append("g") 
          .selectAll("path") 
          .data(function (d) { return d; }) 
          .enter() 
          .append("path") 
          .attr("d", d3.ribbon() 
              .radius(180) 
              ) 
          .style("fill", "blue") 
          .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 | chord.sortChords() Function</h3> 
    <div id="GFG"></div> 
  
    <script> 
      // Create the svg area 
      var svg = d3.select("#GFG") 
          .append("svg") 
          .attr("width", 400) 
          .attr("height", 200) 
          .append("g") 
          .attr("transform", "translate(200,200)"); 
  
      // Create input data 
      var data = [[0, 71, 89, 68, 71, 89, 68], 
                  [ 11, 0, 60, 71, 9,  9, 0], 
                  [ 10, 145, 0, 85, 145, 0, 85], 
                  [ 13, 9,  9, 0, 0, 60, 71], 
                  [ 13, 9,  9, 0, 0, 60, 71], 
                  [ 10, 145, 0, 85, 145, 0, 85], 
                  [0, 71, 89, 68, 71, 89, 68]]; 
  
      // 4 groups, so create a vector of 4 colors 
      var colors_1 = [d3.schemeSet1[0], d3.schemeCategory10[1], 
          d3.schemeCategory10[2], d3.schemeCategory10[3], 
          d3.schemeCategory10[4], d3.schemeCategory10[5], 
          d3.schemeCategory10[6]]; 
  
      var colors = [d3.schemeSet1[0], d3.schemeSet1[1], 
          d3.schemeSet1[2], d3.schemeSet1[3], 
          d3.schemeSet1[4], d3.schemeSet1[5], 
          d3.schemeSet1[6]]; 
  
      // Give this matrix to d3.chord() 
      var chords = d3.chord() 
          .padAngle(0.2) 
          .sortSubgroups(d3.ascending) 
  
          // Use of chord.sortChords() Function 
          .sortChords(d3.descending)(data) 
  
      svg.datum(chords) 
          .append("g") 
          .selectAll("g") 
          .data(function (d) { return d.groups; }) 
          .enter() 
          .append("g") 
          .append("path") 
          .style("fill", function (d, i) { 
              return colors[i]  
          }) 
          .style("stroke", "black") 
          .attr("d", d3.arc() 
              .innerRadius(150) 
              .outerRadius(180) 
          ); 
  
      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, i) { 
              return colors_1[i]  
          }) 
          .style("stroke", "black"); 
    </script>  
  </center> 
</body>  
</html>