The d3.lineRadial.defined() method lets you specify whether there is data defined for a given data point, angle, or not. If this method returns false, this means that data point exists, else true.
Syntax:
d3.lineRadial.defined(data_point);
Parameters:
- data_point: data_point to be checked, it can be an angle, radius, etc.
Return Value: This method returns a boolean value.
Example 1: In this example, we will omit a certain angle using this method.
<!DOCTYPE html> <html> <meta charset="utf-8"> <script src= </script> <body>     <h1 style="text-align: center; color: green;">          neveropen     </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: 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)     // Excluding specific angle     .defined((d) => d.angle >= 3.14);          d3.select("#gfg")     .select("g")     .append("path")     .attr("d", lineRadialGenerator(data))     .attr("fill", "none")     .attr("stroke", "green");   </script>   </html> |
Output:
Example 2:
<!DOCTYPE html> <html> <meta charset="utf-8"> <script src= </script> <body>     <h1 style="text-align: center; color: green;">          neveropen     </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)     // Excluding null angles     .defined((d) => d.angle != null);          d3.select("#gfg")     .select("g")     .append("path")     .attr("d", lineRadialGenerator(data))     .attr("fill", "none")     .attr("stroke", "green");   </script>   </html> |
Output:
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