D3.js interpolateRgb() Function

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d3.InterpolateRgb() Function is used to interpolate the two colors and return the interpolator between them with a gamma value that is adjustable.

Syntax:

d3.interpolateRgb(a, b)

Parameters: It takes the two parameters.

a: It is a color.
b: It is a color.

Returns: It returns the Interpolator function.

Below given are a few Examples of d3.interpolateRgb() function.

Example 1: Printing color in the console.

<!DOCTYPE html> 
<html lang="en"> 
<head> 
  <meta charset="UTF-8"> 
  <meta name="viewport" 
        content="width=device-width,  
                 initial-scale=1.0"> 
  <title>Document</title> 
</head> 
<style> 
</style> 
<body> 
  <!--fetching from CDN of D3.js -->
  <script type = "text/javascript" 
          src = 
 "https://d3js.org/d3.v4.min.js"> 
   </script> 
  <script> 
    console.log("Type of the function is: ", 
 typeof(d3.interpolateRgb("Red", "blue"))); 
    console.log(d3.interpolateRgb("Red", "blue")(0.2)); 
    console.log(d3.interpolateRgb("Red", "green")(0.2)) 
  </script> 
</body> 
</html> 

Output:

Example 2: Displaying color in HTML

<!DOCTYPE html> 
<html lang="en"> 
<head> 
  <meta charset="UTF-8"> 
  <meta name="viewport" 
        content="width=device-width, 
                 initial-scale=1.0"> 
  <title>Document</title> 
</head> 
<style> 
  .b1, .b2{ 
    width: 100px; 
    height: 100px; 
  } 
</style> 
<body> 
  <div class="b1"> 
  
  </div> 
  <div class="b2"> 
  
  </div> 
  <!--fetching from CDN of D3.js -->
  <script type = "text/javascript"
          src = "https://d3js.org/d3.v4.min.js"> 
  </script> 
  <script> 
    let color=d3.interpolateRgb( 
"white", "green")(0.2); 
    let color2=d3.interpolateRgb( 
"blue", "green")(0.8); 
    let b1=document.querySelector(".b1"); 
    let b2=document.querySelector(".b2"); 
    b1.style.backgroundColor=color; 
    b2.style.backgroundColor=color2; 
  </script> 
</body> 
</html> 

Output:

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