D3.js line.y() Method

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

Syntax:

d3.line.y();

Parameters:

y-point: This method takes a y-point that can be set from the points array.

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

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

HTML

<!DOCTYPE html> 
<html> 
<meta charset="utf-8"> 
  
<head> 
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"> 
    </script> 
</head> 
  
<body> 
    <h1 style="text-align:center; color:green;"> 
        zambiatek 
    </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) 
            // Setting the y-point 
            .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 y points.

HTML

<!DOCTYPE html> 
<html> 
<meta charset="utf-8"> 
  
<head> 
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"> 
    </script> 
</head> 
  
<body> 
    <h1 style="text-align:center; color:green;"> 
        zambiatek 
    </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.y()); 
        console.log(Gen.y) 
    </script> 
</body> 
  
</html> 

Output:

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