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D3.js arc.startAngle() Function

  • Last Updated : 23 Sep, 2020

The arc.endAngle() function in d3.js library is used to set the start angle of the arc. This function sets the start angle to a function or to an integer.

Syntax:

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arc.startAngle([angle]);

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

  • angle: This takes a number that corresponds to the start angle of the arc.

Return Values: This function does not return anything.



Below given are a few examples of the function given above.

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=
    </script>
</head>
  
<body>
    <div style="width:300px; height:300px;">
        <center>
            <h1 style="color:green">
                GeeksforGeeks
            </h1>
            <h2>
                arc.startAngle()
            </h2>
        </center>
        <svg width="300" height="300">
        </svg>
    </div>
      
    <script>
        var svg = d3.select("svg")
            .append("g")
            .attr("transform", "translate(150, 100)");
  
        // An arc will be produced
        var arc = d3.arc()
            .outerRadius(20)
            .innerRadius(90)
            // Use of arc.startAngle() Function 
            .startAngle(3)
            .endAngle(2 * 2.5);
  
        svg.append("path")
            .attr("class", "arc")
            .attr("d", arc);
  
        let p = document.querySelector(".arc");
        p.style.fill = "green";
    </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=
    </script>
</head>
  
<body>
    <div style="width:300px; height:300px;">
        <center>
            <h1 style="color:green">
                GeeksforGeeks
            </h1>
            <h2>
                arc.startAngle()
            </h2>
        </center>
        <svg width="300" height="300">
        </svg>
    </div>
      
    <script>
        var svg = d3.select("svg")
            .append("g")
            .attr("transform", "translate(150, 100)");
  
        // An arc will be produced
        var arc = d3.arc()
            .outerRadius(20)
            .innerRadius(90)
            // Use of arc.startAngle() Function 
            .startAngle(5)
            .endAngle(0.5);
  
        svg.append("path")
            .attr("class", "arc")
            .attr("d", arc);
  
        let p = document.querySelector(".arc");
        p.style.fill = "green";
    </script>
</body>
  
</html>

Output:




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