D3.js color.darker() Function

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The color.darker() function of D3.js is used to make a copy of the color with some extra darkness or brightness in the original color.

Syntax:

color.darker(k)

Parameter: It takes the following parameters:

k: Here “k” is the amount of darkness required in the original color. It is the Integer value.

Return values: It returns the object.

Example 1:

When the value of k is not given

<!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> 
  .originalColor{ 
    height: 100px; 
    width: 100px; 
  } 
  .darkerColor{ 
    height: 100px; 
    width: 100px; 
  } 
</style> 
<body> 
  Color without color.darker() property 
  <div class="originalColor"> 
  
  </div> 
  Color with color.darker() property 
  <div class="darkerColor"> 
  
  </div> 
  <!--fetching from CDN of D3.js -->
  <script type = "text/javascript" 
          src = "https://d3js.org/d3.v4.min.js"> 
  </script> 
  <script> 
    let originalColor= 
           document.querySelector(".originalColor"); 
    let darkerColor= 
           document.querySelector(".darkerColor"); 
  
    var color= d3.color("green"); 
    originalColor.style.backgroundColor= 
           `rgb(${color.r}, ${color.g}, ${color.b})`; 
    var color=color.darker() 
    darkerColor.style.backgroundColor= 
          `rgb(${color.r}, ${color.g}, ${color.b})`; 
  </script> 
</body> 
</html> 

Output:

Example 2:

When the value of k > 0

<!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> 
  .originalColor{ 
    height: 100px; 
    width: 100px; 
  } 
  .darkerColor{ 
    height: 100px; 
    width: 100px; 
  } 
</style> 
<body> 
  Color without color.darker() property 
  <div class="originalColor"> 
  
  </div> 
  Color with color.darker(2) property 
  <div class="darkerColor"> 
  
  </div> 
  <!--fetching from CDN of D3.js -->
  <script type = "text/javascript" 
          src = "https://d3js.org/d3.v4.min.js"> 
  </script> 
  <script> 
    let originalColor= 
document.querySelector(".originalColor"); 
    let darkerColor= 
document.querySelector(".darkerColor"); 
    var color= d3.color("green"); 
    originalColor.style.backgroundColor= 
`rgb(${color.r}, ${color.g}, ${color.b})`; 
    var color=color.darker(2) 
    darkerColor.style.backgroundColor= 
`rgb(${color.r}, ${color.g}, ${color.b})`; 
  </script> 
</body> 
</html> 

Output:

Example 3:

When value of k<0

<!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> 
  .originalColor{ 
    height: 100px; 
    width: 100px; 
  } 
  .darkerColor{ 
    height: 100px; 
    width: 100px; 
  } 
</style> 
<body> 
  Color without color.darker() property 
  <div class="originalColor"> 
  
  </div> 
  Color with color.darker(-2) property 
  <div class="darkerColor"> 
  
  </div> 
  <!--fetching from CDN of D3.js -->
  <script type = "text/javascript" 
          src = "https://d3js.org/d3.v4.min.js"> 
  </script> 
  <script> 
    let originalColor= 
document.querySelector(".originalColor"); 
    let darkerColor= 
document.querySelector(".darkerColor"); 
    var color= d3.color("green"); 
    originalColor.style.backgroundColor= 
`rgb(${color.r}, ${color.g}, ${color.b})`; 
    var color=color.darker(-2) 
    darkerColor.style.backgroundColor= 
`rgb(${color.r}, ${color.g}, ${color.b})`; 
  </script> 
</body> 
</html> 

Output:

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