D3.js arc.centroid() Function

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The arc.centroid() function is used to compute the midpoint of the centerline of the arc. The midpoint that is generated is calculated using (startAngle+endAngle)/2 and (innerRadius+outerRadius)/2.

Syntax:

arc.centroid(arguments);

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

arguments: These are the arbitrary arguments.

Return Values: This function return an array containing the points.

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> 
    <script>  
  
        // Creating an arc 
        var arc = d3.arc() 
            .innerRadius(40) 
            .outerRadius(45) 
            .startAngle(10) 
            .endAngle(8); 
  
        // arc.centroid function  
        console.log(arc.centroid()); 
    </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> 
    <script>  
  
        // Creating an arc 
        var arc = d3.arc() 
            .innerRadius(40) 
            .outerRadius(45) 
            .startAngle(0) 
            .endAngle(8); 
        // arc.centroid function  
        console.log("Change in start and end angle"); 
        console.log("will change the centroid"); 
        console.log(arc.centroid()); 
    </script>  
</body> 
   
</html>