D3.js areaRadial.angle() Method

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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.

HTML

<!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;"> 
        zambiatek 
    </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>

Output:

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

HTML

<!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;"> 
        zambiatek 
    </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>

Output:

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