D3.js lineRadial.angle() Method

Last Updated : 26 Aug, 2020

The d3.lineRadial.angle() method is a radial line accessor method. It sets or returns the angle accessor. If the angle is provided, it must be a number or a function that returns a number representing an angle in radians.

Syntax:

d3.lineRadial.angle( angle );

Parameters:

angle: This method takes an angle that can be a number or a function returning the angle.

Return Value: This method returns the angle accessor of the Radial line.

Example 1: Setting the angle using this method. For setting radius, we have used lineRadial.radius() method.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <meta charset="utf-8"> 
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"> 
    </script> 
    <script src= 
        "https://d3js.org/d3.v4.min.js"> 
    </script> 
</head> 
  
<body> 
    <h1 style="text-align:center; color:green;"> 
        GeeksforGeeks 
    </h1> 
      
    <center> 
        <svg id="gfg" width="200" height="200"> 
            <g transform="translate(100,100)"></g> 
        </svg> 
    </center> 
  
    <script> 
        var lineRadialGenerator = d3.lineRadial(); 
        var data = [ 
            { angle: 0, radius: 10 }, 
            { angle: 3.14 * .5, radius: 35 }, 
            { angle: 3.14 * .75, radius: 55 }, 
            { angle: 3.14, radius: 60 }, 
            { angle: 3.14 * 1.25, radius: 65 }, 
            { angle: 3.14 * 1.5, radius: 70 }, 
            { angle: 3.14 * 1.75, radius: 75 }, 
            { angle: 3.14 * 2, radius: 80 }, 
            { angle: 3.14 * 2.25, radius: 85 }, 
            { angle: 3.14 * 2.5, radius: 90 }, 
            { angle: 3.14 * 2.75, radius: 95 }, 
            { angle: 3.14 * 3, radius: 100 }, 
            { angle: 3.14 * 3.25, radius: 105 }, 
            { angle: 3.14 * 3.5, radius: 110 } 
        ]; 
  
        var lineRadialGenerator = d3.lineRadial() 
            .angle((d) => d.angle) 
            .radius((d) => d.radius); 
  
        d3.select("#gfg") 
            .select("g") 
            .append("path") 
            .attr("d", lineRadialGenerator(data)) 
            .attr("fill", "none") 
            .attr("stroke", "green"); 
    </script> 
</body> 
  
</html> 

Output:

Example 2: Getting the function for the angle.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <meta charset="utf-8"> 
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"> 
    </script> 
    <script src= 
        "https://d3js.org/d3.v4.min.js"> 
    </script> 
</head> 
  
<body> 
    <h1 style="text-align:center; color:green;"> 
        GeeksforGeeks 
    </h1> 
      
    <center> 
        <svg id="gfg" width="200" height="200"> 
            <g transform="translate(100,100)"></g> 
        </svg> 
    </center> 
  
    <script> 
        var lineRadialGenerator = d3.lineRadial(); 
        var data = [ 
            { angle: 0, radius: 10 }, 
            { angle: 3.14 * .5, radius: 35 }, 
            { angle: 3.14 * .75, radius: 55 }, 
            { angle: 3.14, radius: 60 }, 
            { angle: 3.14 * 1.25, radius: 65 }, 
            { angle: 3.14 * 1.5, radius: 70 }, 
            { angle: 3.14 * 1.75, radius: 75 }, 
            { angle: 3.14 * 2, radius: 80 }, 
            { angle: 3.14 * 2.25, radius: 85 }, 
            { angle: 3.14 * 2.5, radius: 90 }, 
            { angle: 3.14 * 2.75, radius: 95 }, 
            { angle: 3.14 * 3, radius: 100 }, 
            { angle: 3.14 * 3.25, radius: 105 }, 
            { angle: 3.14 * 3.5, radius: 110 } 
        ]; 
  
        var lineRadialGenerator = d3.lineRadial() 
            .angle((d) => d.angle) 
            .radius((d) => d.radius); 
  
        d3.select("#gfg") 
            .select("g") 
            .append("path") 
            .attr("d", lineRadialGenerator(data)) 
            .attr("fill", "none") 
            .attr("stroke", "green"); 
  
        console.log(lineRadialGenerator.angle()); 
        console.log(lineRadialGenerator.angle); 
    </script> 
</body> 
  
</html> 