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D3.js color.darker() Function

  • Last Updated : 19 Jul, 2020

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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