D3.js interpolatePRGn() Function

Last Updated : 17 Aug, 2020

The d3.interpolatePRGn() function in D3.js is a part of the diverging color scheme which returns the color from the PRGn diverging color scheme in D3.js. Here Pr can be interpreted as purple and Gn can be interpreted as green. Please go through the examples for better understanding.

Syntax:

d3.interpolatePRGn(t);

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

t: This is a number which is in the range [0,1]

Return Values: This function returns an RGB string.

Below given are a few examples of the function given above.

Example1:

HTML

<!DOCTYPE html> 
<html lang="en"> 
    <head> 
        <meta charset="UTF-8" /> 
        <meta
            name="viewport"
            path1tent="width=device-width,  
                       initial-scale=1.0"/> 
        <title>D3.js interpolatePRGn() Function</title> 
    </head> 
    <style></style> 
    <body> 
        <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> 
            // When t is in range [0,1] 
            // Value of t varies as 0.1, 0.2 ....1.0 
            // Output is RGB string 
            console.log(d3.interpolatePRGn(0)); 
            console.log(d3.interpolatePRGn(0.1)); 
            console.log(d3.interpolatePRGn(0.2)); 
            console.log(d3.interpolatePRGn(0.3)); 
            console.log(d3.interpolatePRGn(0.4)); 
            console.log(d3.interpolatePRGn(0.5)); 
            console.log(d3.interpolatePRGn(0.6)); 
            console.log(d3.interpolatePRGn(0.7)); 
            console.log(d3.interpolatePRGn(0.8)); 
            console.log(d3.interpolatePRGn(0.9)); 
            console.log(d3.interpolatePRGn(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 interpolatePRGn() Function</title> 
    </head> 
    <style> 
        div { 
            padding: 10px; 
            width: fit-content; 
            height: 100px; 
            float: left; 
        } 
    </style> 
    <body> 
        <h5> 
            D3.interpolatePRGn() 
        </h5> 
        <br /> 
        <br /> 
        <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> 
                (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.interpolatePRGn(0.1); 
            let color2 = d3.interpolatePRGn(0.2); 
            let color3 = d3.interpolatePRGn(0.3); 
            let color4 = d3.interpolatePRGn(0.4); 
            let color5 = d3.interpolatePRGn(0.5); 
            let color6 = d3.interpolatePRGn(0.6); 
            let color7 = d3.interpolatePRGn(0.7); 
            let color8 = d3.interpolatePRGn(0.8); 
            let color9 = d3.interpolatePRGn(0.9); 
            let color10 = d3.interpolatePRGn(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> 

Output:

Suggest improvement

D3.js bisect() Function

Underscore.js _.fnull() Method

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