D3.js areaRadial.innerRadius() method

Last Updated : 09 Sep, 2020

The areaRadial.innerRadius() method is used to set or return the innerRadius accessor of the areaRadial. It can be a number or a function that returns a number representing the innerRadius of our areaRadial.

Syntax:

areaRadial.innerRadius(inner_Rad);

Parameters: This method accepts single parameter as mentioned above and described below:

inner_Rad: This parameter holds the innerRadius that can be a number or a function returning the innerRadius.

Return Value: This method returns the innerRadius accessor function of the area radial.

Example 1:

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;"> 
        GeeksforGeeks 
    </h1> 
  
    <h3 style="text-align: center;"> 
        D3.js | areaRadial.innerRadius() 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: 1}, 
                {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() 
             .angle(d => xScale(d.x/2)) 
  
             // Setting innerRadius function 
             .innerRadius(d => yScale(d.x/4)) 
             .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:

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;"> 
        GeeksforGeeks 
    </h1> 
  
    <h3 style="text-align: center;"> 
        D3.js | areaRadial.innerRadius() Method 
    </h3> 
  
    <center> 
        <svg id="gfg" width="500" height="500"> 
            <g transform="translate(180, 180)"></g> 
        </svg> 
    </center> 
  
    <script> 
        var data = [ 
          {x: 10, y: 1}, 
          {x: 15, y: 3}, 
          {x: 20, y: 5}, 
          {x: 25, y: 7}, 
          {x: 30, y: 9}, 
          {x: 35, y: 11}, 
          {x: 40, y: 13}]; 
  
        var xScale = d3.scaleLinear() 
          .domain([0, 8]).range([25, 200]); 
  
        var yScale = d3.scaleLinear() 
          .domain([0, 20]).range([200, 25]); 
  
        var Gen = d3.areaRadial() 
             .angle(d => xScale(d.x)) 
  
             // Setting innerRadius function 
             .innerRadius(d => yScale(d.y / 3)) 
             .outerRadius(d => yScale(d.y)); 
  
        d3.select("#gfg") 
          .select("g") 
          .append("path") 
          .attr("d", Gen(data)) 
          .attr("fill", "green") 
          .attr("stroke", "black"); 
    </script> 
</body> 
  
</html>