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D3.js pie.value() Function
  • Last Updated : 31 Aug, 2020

The pie.value() function is used to set the value property of the data returned by the pie generator function. If the value is specified then it sets the value to the given dynamic or static function or the number.

Syntax:

pie.value([value]);

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

  • value: This parameter takes a function or a number.

Return Values: This function does not return anything.

Example 1:



HTML




<!DOCTYPE html>
<html lang="en">
  
<head>
    <meta charset="UTF-8" />
    <meta property="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>
                pie.value()
            </h2>
            <h3>
                When given data array 
                consists objects
            </h3>
        </center>
        <svg width="300" height="300">
        </svg>
    </div>
      
    <script>
        // Data to be added in the pie chart
        var data = [
            { "value": 1, "property": "p1" },
            { "value": 2, "property": "p2" },
            { "value": 3, "property": "p3" },
            { "value": 4, "property": "p4" },
            { "value": 5, "property": "p5" },
            { "value": 6, "property": "p6" }
        ]
  
        // Selecting SVG using d3.select()
        var svg = d3.select("svg");
  
        // Creating Pie generator
        var pie = d3.pie()
            // Use of pie.value() Function
            .value((d) => { return d.value });
  
        // 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) => {
                return d3.schemeSet2[i];
            })
            .attr("d", arc);
    </script>
</body>
  
</html>

Output:

Example 2:

HTML




<!DOCTYPE html>
<html lang="en">
  
<head>
    <meta charset="UTF-8" />
    <meta property="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>
                pie.value()
            </h2>
            <h3>
                When given data array 
                consists objects
            </h3>
        </center>
        <svg width="300" height="300">
        </svg>
    </div>
    <script>
        // Data to be added in the pie chart
        var data = [
            { "value": 1, "property": "p1" },
            { "value": 2, "property": "p2" },
            { "value": 3, "property": "p3" },
            { "value": 4, "property": "p4" },
            { "value": 5, "property": "p5" },
            { "value": 6, "property": "p6" }
        ]
  
        // Selecting SVG using d3.select()
        var svg = d3.select("svg");
  
        // Creating Pie generator
        var pie = d3.pie()
            // Use of pie.value() Function
            .value((d) => { return d.value })
            (data);
  
        // Creating arc
        var arc = d3.arc()
            .innerRadius(50)
            .outerRadius(100);
  
        let g = svg.append("g")
            .attr("transform", "translate(150, 120)");
  
        // Grouping different arcs
        var arcs = g.selectAll("arc")
            .data(pie)
            .enter()
            .append("g");
  
        // Appending path 
        arcs.append("path")
            .attr("fill", (data, i) => {
                return d3.schemeSet2[i];
            })
            .attr("d", arc);
  
        arcs.append("text")
            .attr("transform", (d) => {
                return "translate(" +
                    arc.centroid(d) + ")";
            })
            .text(function (d) {
                return d.value;
            });
    </script>
</body>
  
</html>

Output:




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