The d3.interpolateRainbow() function is used to return a string of RGB color that corresponds to the d3.interpolateWarm in range 0 to 0.5 and d3.interpolateCool in range 0.5 to 1.0 both inclusive thus it forms the cyclic less-angry rainbow color scheme in d3.js.
Syntax:
d3.interpolateRainbow(t);
Parameters: This function accepts single parameter as mentioned above and described below:
- t: It is a numeric value that ranges in [0, 1].
Return Values: This function returns a string of RGB colors.
Below given are a few examples of the function given above.
Example 1:
HTML
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content= "width=device-width, initial-scale=1.0"> <!--Fetching from CDN of D3.js --> </script> <script src= </script> <script src= </script> <script src= </script> </head> <body> <script> console.log(d3.interpolateRainbow(0.4)); console.log(d3.interpolateRainbow(0.3)); console.log(d3.interpolateRainbow(0.2)); console.log(d3.interpolateRainbow(0.5)); console.log(d3.interpolateRainbow(0.4)); console.log(d3.interpolateRainbow(0.9)); console.log(d3.interpolateRainbow(0.2)); console.log(d3.interpolateRainbow(0)); </script> </body> </html> |
Output:
rgb(226, 183, 47) rgb(255, 120, 71) rgb(254, 75, 131) rgb(175, 240, 91) rgb(226, 183, 47) rgb(76, 110, 219) rgb(254, 75, 131) rgb(110, 64, 170)
Example 2:
HTML
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content= "width=device-width, initial-scale=1.0"> <style> div { padding: 6px; text-align: center; vertical-align: middle; display: flex; justify-content: center; width: 90px; height: 50px; float: left; } </style> <!--Fetching from CDN of D3.js --> </script> </script> <script src= </script> <script src= </script> </head> <body> <h2>D3.interpolateRainbow() </h2> <div class="box1"> <span></span> </div> <div class="box2"> <span></span> </div> <div class="box3"> <span></span> </div> <div class="box4"> <span></span> </div> <div class="box5"> <span></span> </div> <script> // Creating different colors for // different Values of t is 0 let color1 = d3.interpolateRainbow(0); // Values of t is 0.1 let color2 = d3.interpolateRainbow(0.1); // Values of t is 0.3 let color3 = d3.interpolateRainbow(0.3); // Values of t is 0.5 let color4 = d3.interpolateRainbow(0.5); // Values of t is 0.8 let color5 = d3.interpolateRainbow(0.8); // 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"); // 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; </script> </body> </html> |
Output:
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