D3.js lineRadial.curve() method

Last Updated : 24 Aug, 2020

The d3.lineRadial.curve() method is used to give a curve to our lineRadial. D3.js provides several curve factories that can be used to give different curves.

Syntax:

d3.lineRadial.curve(curve_factory);

Parameters:

curve_factory: type of curve to be given to the line.

Return Value: This method has no return value.

Example 1: In this example, we will use the curveBasis curve factory.

<!DOCTYPE html> 
<html> 
<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>  
<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> 
    
</body> 
<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: null, 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) 
    .curve(d3.curveBasis) 
        
 d3.select("#gfg") 
    .select("g") 
    .append("path") 
    .attr("d", lineRadialGenerator(data)) 
    .attr("fill", "none") 
    .attr("stroke", "green"); 
  
</script>    
</html>

Output:

Example 2: In this example, we will use the curveCardinal curve factory.

<!DOCTYPE html> 
<html> 
<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>  
<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> 
    
</body> 
<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: null, 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) 
    .curve(d3.curveCardinal) 
        
 d3.select("#gfg") 
    .select("g") 
    .append("path") 
    .attr("d", lineRadialGenerator(data)) 
    .attr("fill", "none") 
    .attr("stroke", "green"); 
  
</script>    
</html>