D3.js line.x() method

Last Updated : 17 Aug, 2020

The d3.line.x() method sets or gets the x accessor point of the line. If x is provided, it must be a number or a function that returns a number.

Syntax:

d3.line.x(x-point);

Parameters:

x-point: This method takes an x-point that can be set from the points array.

Return Value: This method returns the x accessor point of the line.

Example 1: Setting the x-point using this method. For y-points here we have used line.y() function.

<!DOCTYPE html> 
<html> 
<meta charset="utf-8"> 
<head> 
  <title>Line in D3.js</title> 
</head> 
<script src= 
"https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"> 
</script> 
  
<body> 
    <h1 style="text-align: center; 
               color: green;"> 
         GeeksforGeeks 
   </h1> 
  <center> 
    <svg id="gfg" width="200" height="200"> 
  </svg> 
</center> 
  <script> 
var points = [ 
  {xpoint: 25,  ypoint: 150}, 
  {xpoint: 75,  ypoint: 85}, 
  {xpoint: 100, ypoint: 115}, 
  {xpoint: 175, ypoint: 25}]; 
  
var Gen = d3.line() 
  // Setting the x-point 
  .x((p) => p.xpoint) 
  .y((p) => p.ypoint); 
  
d3.select("#gfg") 
  .append("path") 
  .attr("d", Gen(points)) 
  .attr("fill", "none") 
  .attr("stroke", "green"); 
</script> 
</body> 
</html>

Output:

Example 2: getting the function for x points.

<!DOCTYPE html> 
<html> 
<meta charset="utf-8"> 
<head> 
  <title>Line in D3.js</title> 
</head> 
<script src= 
"https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"> 
</script> 
  
<body> 
    <h1 style="text-align: center; color: green;"> 
       GeeksforGeeks 
    </h1> 
  <center> 
    <svg id="gfg" width="200" height="200"></svg> 
</center> 
  <script> 
var points = [ 
  {xpoint: 25,  ypoint: 150}, 
  {xpoint: 75,  ypoint: 85}, 
  {xpoint: 100, ypoint: 115}, 
  {xpoint: 175, ypoint: 25}]; 
  
var Gen = d3.line() 
  .x((p) => p.xpoint) 
  .y((p) => p.ypoint); 
  
d3.select("#gfg") 
  .append("path") 
  .attr("d", Gen(points)) 
  .attr("fill", "none") 
  .attr("stroke", "green"); 
console.log(Gen.x()); 
console.log(Gen.x) 
</script> 
</body> 
</html>