D3.js scalePoint() Function

Last Updated : 18 Sep, 2020

The d3.scalepoint() function is used to create and return a new point scale with a particular domain and range, no rounding, no padding, and center alignment.

Syntax:

d3.scalePoint([[domain, ]range]);

Parameters: This function takes two parameters as given above and described below:

domain: It defines the minimum and maximum value for the scale. By default, the domain contain an empty array.
range: Every value in domain maps with value in the range. The default range is [0,1].

Return Values: This function does not return anything.

Example 1:

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta name="viewport" path1tent= 
        "width=device-width,  
        initial-scale = 1.0" /> 
  
    <script src= 
        "https://d3js.org/d3.v4.min.js"> 
    </script> 
</head> 
  
<body> 
    <script> 
        // Creating the point scale with 
        // specified domain and range. 
        var point = d3.scalePoint() 
  
            // Setting domain for the scale 
            .domain(["red", "green", "black", "blue"]) 
          
            // Setting the range for the scale. 
            .range([0.1, 0.2, 0.3, 0.4, 0.5]); 
  
        console.log("point(red)", point("red")); 
        console.log("point(black)", point("black")); 
        console.log("point(green)", point("green")); 
        console.log("point(blue)", point("blue")); 
    </script> 
</body> 
  
</html> 

Output:

Example 2:

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8" /> 
    <meta name="viewport" path1tent= 
        "width=device-width,  
        initial-scale = 1.0" /> 
  
    <script src= 
        "https://d3js.org/d3.v4.min.js"> 
    </script> 
</head> 
  
<body> 
    <script> 
        // Creating the point scale with 
        // specified domain and range. 
        var point = d3.scalePoint() 
  
            // Setting domain for the scale 
            .domain([0, 1, 2, 3, 4, 5, 6]) 
          
            // Setting the range for the scale. 
            .range([3, 4, 0.5]); 
  
        console.log("point(1)", point("1")); 
        console.log("point(3)", point("3")); 
        console.log("point(5)", point("5")); 
    </script> 
</body> 
  
</html> 