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D3.js pie() Function
  • Last Updated : 01 Sep, 2020

The d3.pie() is used to construct a pie generator that has its default settings. This pie generator takes an array of data and then returns an array of objects that contains details about each arc angle.

Syntax:

d3.pie();

Parameters: This function does not accept any parameters.

Return Values: This function returns a pie generator.

Below given are a few examples of the function given above.



Example 1:

HTML




<!DOCTYPE html> 
<html lang="en"
  
<head
    <meta charset="UTF-8" /> 
    <meta name="viewport"
          content="width=device-width, 
                  initial-scale=1.0"/> 
      
    <!--Fetching from CDN of D3.js -->
    <script src
        "https://d3js.org/d3.v6.min.js"
    </script>
</head>
  
<body
    <div style="width:300px; height:300px;">
        <center>
            <h1 style="color:green">
                GeeksforGeeks
            </h1
  
            <h2>
                d3.pie()
            </h2
        </center>
  
        <svg width="300" height="300">
        </svg>
  
    </div>
    <script
        var data = [1.1,2.2,4.46,2.12,1.36,5.002445,4.1242];
  
        // Selecting SVG using d3.select()
        var svg = d3.select("svg");
  
        let g = svg.append("g")
               .attr("transform", "translate(150,120)");
          
        // Creating Pie generator
        var pie = d3.pie();
  
        // Creating arc
        var arc = d3.arc()
                    .innerRadius(0)
                    .outerRadius(100);
  
        // Grouping different arcs
        var arcs = g.selectAll("arc")
                    .data(pie(data))
                    .enter()
                    .append("g");
  
        // Appending path 
        arcs.append("path")
            .attr("fill", (data, i)=>{
                let value=data.data;
                return d3.schemeSet3[i];
            })
            .attr("d", arc);
    </script
</body
  
</html>

Output:

Example 2:

HTML




<!DOCTYPE html> 
<html lang="en"
  
<head
    <meta charset="UTF-8" /> 
    <meta name="viewport"
          content="width=device-width, 
                  initial-scale=1.0"/> 
  
    <!--Fetching from CDN of D3.js -->
    <script src
        "https://d3js.org/d3.v6.min.js"
    </script>
</head>
  
<body
    <div style="width:300px; height:300px;">
        <center>
            <h1 style="color:green">
                GeeksforGeeks
            </h1
  
            <h2>
                d3.pie()
            </h2
  
        </center>
  
        <svg width="300" height="300">
        </svg>
  
    </div>
      
    <script
        var data = [1,2,4.4,2,1,5,4];
  
        // Selecting SVG using d3.select()
        var svg = d3.select("svg");
          
        // Creating Pie generator
        var pie = d3.pie();
  
        // Creating arc
        var arc = d3.arc()
                    .innerRadius(0)
                    .outerRadius(100);
  
        let g = svg.append("g")
                   .attr("transform", "translate(150,120)");
  
        // Grouping different arcs
        var arcs = g.selectAll("arc")
                    .data(pie(data))
                    .enter()
                    .append("g");
  
        // Appending path 
        arcs.append("path")
            .attr("fill", (data, i)=>{
                let value=data.data;
                return d3.schemeSet3[i+1];
            })
            .attr("d", arc);
          
        // Adding data to each arc
        arcs.append("text")
            .attr("transform",(d)=>{ 
                    return "translate("+ 
                    arc.centroid(d) + ")"; 
            })
            .text(function(d){
               return d.data; 
               });
    </script
</body>
  
</html>

Output:




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