D3.js areaRadial.angle() Method

The areaRadial.angle() method is used to set or gets the angle accessor. The angle must be a number or a function that returns a number representing an angle in radians.

Syntax:

areaRadial.angle(angle);

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

  • angle: This parameter holds an angle that can be a number or a function returning the angle ranging (0 to 2π) radians.

Return Value: This method returns the angle accessor of the area radial.

Example 1: The following example sets the angle using this method.



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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
  
    <script src=
        "https://d3js.org/d3.v5.min.js">
    </script>
</head>
  
<body>
    <h1 style="text-align: center; color: green;">
        GeeksforGeeks
    </h1>
  
    <h3 style="text-align: center;">
        D3.js | areaRadial.angle() Method
    </h3>
  
    <center>
        <svg id="gfg" width="200" height="200">
            <g transform="translate(100, 100)"></g>
        </svg>
    </center>
  
    <script>
        var points = [
                {x: 0, y: 0},
                {x: 2, y: 3},
                {x: 4, y: 12},
                {x: 6, y: 8},
                {x: 8, y: 17},
                {x: 10, y: 15},
                {x: 12, y: 20}];
  
        var xScale = d3.scaleLinear()
            .domain([0, 6]).range([0, 2 * Math.PI]);
        var yScale = d3.scaleLinear()
            .domain([0, 20]).range([90, 30]);
  
        var Gen = d3.areaRadial()
             // Setting the angle function
             .angle(d => xScale(d.x*4))
             .innerRadius(d => yScale(d.y/6))
             .outerRadius(d => yScale(d.y));
  
        d3.select("#gfg")
          .select("g")
          .append("path")
          .attr("d", Gen(points))
          .attr("fill", "green")
          .attr("stroke", "black");
    </script>
</body>
  
</html>

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Output:

Example 2: The following example demonstrates getting the function for the angle.

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<!DOCTYPE html>
<html>
  
<head>
    <meta charset="utf-8">
    <script src=
        "https://d3js.org/d3.v5.min.js">
    </script>
</head>
  
<body>
    <h1 style="text-align: center; color: green;">
        GeeksforGeeks
    </h1>
  
    <h3 style="text-align: center;">
        D3.js | areaRadial.angle() Method
    </h3>
  
    <center>
        <svg id="gfg" width="200" height="200">
            <g transform="translate(100, 100)"></g>
        </svg>
    </center>
  
    <script>
        var points = [
                {x: 0, y: 0},
                {x: 2, y: 3},
                {x: 4, y: 12},
                {x: 6, y: 8},
                {x: 8, y: 17},
                {x: 10, y: 15},
                {x: 12, y: 20}];
  
        var xScale = d3.scaleLinear()
            .domain([0, 6]).range([0, 2 * Math.PI]);
        var yScale = d3.scaleLinear()
            .domain([0, 20]).range([90, 30]);
  
        var Gen = d3.areaRadial()
             // Setting the angle function
             .angle(d => xScale(d.x*4))
             .innerRadius(d => yScale(d.y/6))
             .outerRadius(d => yScale(d.y));
  
        d3.select("#gfg")
          .select("g")
          .append("path")
          .attr("d", Gen(points))
          .attr("fill", "green")
          .attr("stroke", "black");
  
        console.log(Gen.angle);
        console.log(Gen.angle());
    </script>
</body>
</html>

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Output:

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