D3.js interpolateRdYlGn() Function

Last Updated : 14 Aug, 2020

The d3.interpolateRdYlGn() function in D3.js is used to returns the corresponding color from the diverging color scheme of RdYlGn, where Rd is red, Yl is yellow and Gn is green.

Syntax:

d3.interpolateRdYlGn(t)

Parameters: This function accepts a single parameter as mentioned above and described below:

t: It is any number in the range 0 to 1.

Return Values: This function returns an RGB string of color.

Below examples illustrate the D3.js interpolateRdYlGn() function in JavaScript:

Example1:

HTML

<!DOCTYPE html> 
<html lang="en"> 
    <head> 
        <meta charset="UTF-8" /> 
        <meta
            name="viewport"
            content="width=device-width,  
                     initial-scale=1.0"/> 
        <title>D3.js interpolateRdYlGn() Function</title> 
    </head> 
    <style></style> 
    <body> 
        <!--Fetching from CDN of D3.js -->
        <script src= 
"https://d3js.org/d3.v4.min.js"> 
        </script> 
        <script src= 
"https://d3js.org/d3-color.v1.min.js"> 
        </script> 
        <script src= 
"https://d3js.org/d3-interpolate.v1.min.js"> 
        </script> 
        <script src= 
"https://d3js.org/d3-scale-chromatic.v1.min.js"> 
        </script> 
        <script> 
            console.log(d3.interpolateRdYlGn(0)); 
            console.log(d3.interpolateRdYlGn(0.12)); 
            console.log(d3.interpolateRdYlGn(0.24)); 
            console.log(d3.interpolateRdYlGn(0.354)); 
            console.log(d3.interpolateRdYlGn(0.45)); 
            console.log(d3.interpolateRdYlGn(0.52)); 
            console.log(d3.interpolateRdYlGn(0.61)); 
            console.log(d3.interpolateRdYlGn(0.74)); 
            console.log(d3.interpolateRdYlGn(0.8)); 
            console.log(d3.interpolateRdYlGn(0.92)); 
            console.log(d3.interpolateRdYlGn(1.0)); 
        </script> 
    </body> 
</html>

Output:

Example 2:

HTML

<!DOCTYPE html> 
<html lang="en"> 
    <head> 
        <meta charset="UTF-8" /> 
        <meta
            name="viewport"
            content="width=device-width,  
                     initial-scale=1.0"/> 
        <title>D3.js interpolateRdYlGn() Function</title> 
    </head> 
    <style> 
        div { 
            padding: 5px; 
            text-align: center; 
            vertical-align: middle; 
            display: flex; 
            justify-content: center; 
            width: fit-content; 
            height: 50px; 
            float: left; 
        } 
    </style> 
    <body> 
        <h2>D3.interpolateRdYlGn()</h2> 
        <div class="box1"> 
            <span> 
                (0.1) 
            </span> 
        </div> 
        <div class="box2"> 
            <span> 
                (0.2) 
            </span> 
        </div> 
        <div class="box3"> 
            <span> 
                (0.3) 
            </span> 
        </div> 
        <div class="box4"> 
            <span> 
                (0.4) 
            </span> 
        </div> 
        <div class="box5"> 
            <span> 
                (0.5) 
            </span> 
        </div> 
        <div class="b6"> 
            <span> 
                (0.6) 
            </span> 
        </div> 
        <div class="b7"> 
            <span> 
                (0.7) 
            </span> 
        </div> 
        <div class="b8"> 
            <span> 
                (0.8) 
            </span> 
        </div> 
        <div class="b9"> 
            <span> 
                (0.9) 
            </span> 
        </div> 
        <div class="b10"> 
            <span style="color: honeydew;"> 
                (1.0) 
            </span> 
        </div> 
        <!--Fetching from CDN of D3.js -->
        <script src= 
"https://d3js.org/d3.v4.min.js"> 
        </script> 
        <script src= 
"https://d3js.org/d3-color.v1.min.js"> 
        </script> 
        <script src= 
"https://d3js.org/d3-interpolate.v1.min.js"> 
        </script> 
        <script src= 
"https://d3js.org/d3-scale-chromatic.v1.min.js"> 
        </script> 
        <script> 
            // Creating different colors for different 
            // Values of t as 0.1,0.2... 1.0 
            let color1 = d3.interpolateRdYlGn(0.1); 
            let color2 = d3.interpolateRdYlGn(0.2); 
            let color3 = d3.interpolateRdYlGn(0.3); 
            let color4 = d3.interpolateRdYlGn(0.4); 
            let color5 = d3.interpolateRdYlGn(0.5); 
            let color6 = d3.interpolateRdYlGn(0.6); 
            let color7 = d3.interpolateRdYlGn(0.7); 
            let color8 = d3.interpolateRdYlGn(0.8); 
            let color9 = d3.interpolateRdYlGn(0.9); 
            let color10 = d3.interpolateRdYlGn(1.0); 
  
            // Selecting Div using query selector 
            let box1 = document.querySelector(".box1"); 
            let box2 = document.querySelector(".box2"); 
            let box3 = document.querySelector(".box3"); 
            let box4 = document.querySelector(".box4"); 
            let box5 = document.querySelector(".box5"); 
            let b6 = document.querySelector(".b6"); 
            let b7 = document.querySelector(".b7"); 
            let b8 = document.querySelector(".b8"); 
            let b9 = document.querySelector(".b9"); 
            let b10 = document.querySelector(".b10"); 
  
            // Setting style and BG color of the particular DIVs 
            box1.style.backgroundColor = color1; 
            box2.style.backgroundColor = color2; 
            box3.style.backgroundColor = color3; 
            box4.style.backgroundColor = color4; 
            box5.style.backgroundColor = color5; 
            b6.style.backgroundColor = color6; 
            b7.style.backgroundColor = color7; 
            b8.style.backgroundColor = color8; 
            b9.style.backgroundColor = color9; 
            b10.style.backgroundColor = color10; 
        </script> 
    </body> 
</html>