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D3.js interpolateWarm() Function
  • Last Updated : 19 Aug, 2020

The d3.interpolateWarm() function in D3.js is used to return a particular color from the 180° rotation of Niccoli’s perceptual rainbow which is returned as an RGB string.

Syntax:

d3.interpolateWarm(t)

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

  • t: “t” is a number in a range [0, 1]

Return Values It returns an RGB string.

Example 1:



HTML

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<!DOCTYPE html> 
<html lang="en"
<head
    <meta charset="UTF-8" /> 
    <meta name="viewport"
        path1tent="width=device-width,  
        initial-scale=1.0"/> 
          
    <title>D3.js interpolateWarm() Function</title
    <script src="https://d3js.org/d3.v4.min.js">
    </script>
    <script src="https://d3js.org/d3-color.v1.min.js">
    </script>
    <script src=
    </script>
    <script src=
    </script
</head
<body
    <center>
    <h1 style="color:green;">GeeksForGeeks</h1>
      
    <h3>D3.js interpolateWarm() Function</h3>
      
    <script
        document.write(d3.interpolateWarm(0)+"<br>"); 
        document.write(d3.interpolateWarm(0.1)+"<br>");
        document.write(d3.interpolateWarm(0.2)+"<br>");
        document.write(d3.interpolateWarm(0.3)+"<br>");
        document.write(d3.interpolateWarm(0.4)+"<br>");
        document.write(d3.interpolateWarm(0.5)+"<br>");
        document.write(d3.interpolateWarm(0.6)+"<br>");
        document.write(d3.interpolateWarm(0.7)+"<br>");
        document.write(d3.interpolateWarm(0.8)+"<br>");
        document.write(d3.interpolateWarm(0.9)+"<br>");
        document.write(d3.interpolateWarm(1));
    </script
    </center>
</body
</html>

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Output:

Example 2:

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<!DOCTYPE html> 
<html lang="en"
<head
    <meta charset="UTF-8" /> 
    <meta name="viewport"
        path1tent="width=device-width,  
        initial-scale=1.0"/> 
          
    <title>D3.js interpolateWarm() Function</title
    <script src="https://d3js.org/d3.v4.min.js">
    </script>
    <script src="https://d3js.org/d3-color.v1.min.js">
    </script>
    <script src=
    </script>
    <script src=
    </script>
  
    <style
        div { 
            padding: 3px; 
            width: fit-content; 
            height: 20px;
            width: 200px;
        
    </style>
</head
   
<body
    <center>
    <h1 style="color:green;">GeeksForGeeks</h1>
      
    <h3>D3.js interpolateWarm() Function</h3>
      
    <div class="b1"
        <span
            D3.interpolateWarm(0) 
        </span
    </div
    <div class="b2"
        <span
            D3.interpolateWarm(0.1)  
        </span
    </div
    <div class="b3"
        <span
            D3.interpolateWarm(0.2)
        </span
    </div
    <div class="b4"
        <span
            D3.interpolateWarm(0.3)  
        </span
    </div
    <div class="b5"
        <span
            D3.interpolateWarm(0.4) 
        </span
    </div
    <div class="b6"
        <span
            D3.interpolateWarm(0.5)  
        </span
    </div
    <div class="b7"
        <span
            D3.interpolateWarm(0.6)  
        </span
    </div
    <div class="b8"
        <span
            D3.interpolateWarm(0.7) 
        </span
    </div
    <div class="b9"
        <span
            D3.interpolateWarm(0.8)  
        </span
    </div
    <div class="b10"
        <span
            D3.interpolateWarm(0.9)  
        </span
    </div
    <div class="b11"
        <span
            D3.interpolateWarm(1)  
        </span
    </div
    <script
        // Array of colors is given 
        let color1 = d3.interpolateWarm(0.0); 
        let color2 = d3.interpolateWarm(0.1); 
        let color3 = d3.interpolateWarm(0.2); 
        let color4 = d3.interpolateWarm(0.3); 
        let color5 = d3.interpolateWarm(0.4); 
        let color6 = d3.interpolateWarm(0.5);
        let color7 = d3.interpolateWarm(0.6); 
        let color8 = d3.interpolateWarm(0.7); 
        let color9 = d3.interpolateWarm(0.8); 
        let color10 = d3.interpolateWarm(0.9); 
        let color11 = d3.interpolateWarm(1.0); 
  
        let b1 = document.querySelector(".b1"); 
        let b2 = document.querySelector(".b2"); 
        let b3 = document.querySelector(".b3"); 
        let b4 = document.querySelector(".b4"); 
        let b5 = document.querySelector(".b5"); 
        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"); 
        let b11 = document.querySelector(".b11"); 
          
        b1.style.backgroundColor = color1; 
        b2.style.backgroundColor = color2;
        b3.style.backgroundColor = color3; 
        b4.style.backgroundColor = color4;
        b5.style.backgroundColor = color5; 
        b6.style.backgroundColor = color6;
        b7.style.backgroundColor = color7;
        b8.style.backgroundColor = color8; 
        b9.style.backgroundColor = color9;
        b10.style.backgroundColor = color10; 
        b11.style.backgroundColor = color11;
    </script
    </center>
</body
</html>

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Output:

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