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Fabric.js easeOutCubic() Method

Last Updated : 05 Feb, 2021
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In animation and games, it can be seen that many objects are moving from one point to another linearly. But after using the Easing function, the object’s way of progressing can take a different natural and interesting shape.

Easing functions is the rate of change of a parameter over time. It is that kind of equations that moves slowly at the start and speed up and slow down at the end. These sets of equations are taken from Robert Penner’s book and webpage.

The easeOutCubic() method is used for cubic easing out.

Syntax:

easeOutCubic(t, b, c, d)

Parameters: This method accepts four parameter as mentioned above and described below:

  • t: This parameter holds the specified time when animation will start. For example, if value of t is 0, it means animation is just started.
  • b: This parameter holds the specified starting position of the object on x-axis. For example, if value of b is 10, it means the starting position of the objects on x-coordinate is 10.
  • c: This parameter holds the specified change in value for the object. For example, if value of c is 30, it means, the object has to move 30 to the right, ending at 40.
  • d: This parameter holds the specified duration of the whole process. For example, if the value of d is 2, it means, the object has 2 second to perform this motion from 10 to 40.

Return Value: This method returns the eased position of the object i.e., the position of the object at a specific time.

Example 1:

HTML




<!DOCTYPE html>
<html>
  
<head>
  <!-- Adding the FabricJS library -->
  <script src=
  </script>
</head>
  
<body>
    <script type="text/javascript">
      // Initializing easeOutCubic() function
      function easeOutCubic (t, b, c, d) {
          return c * ((t = t / d - 1) * t * t + 1) + b;
      }
  
      // Calling the easeOutCubic() function over
      // the specified parameter values
      console.log(fabric.util.ease.easeOutCubic(1, 2, 3, 4)); 
    </script>
</body>
  
</html>


Output:

3.734375

Example 2:

HTML




<!DOCTYPE html>
<html>
  
<head>
  <!-- Adding the FabricJS library -->
  <script src=
  </script>
</head>
  
<body>
    <script type="text/javascript">
      // Initializing easeOutCubic() function
      function easeOutCubic (t, b, c, d) {
        return c * ((t = t / d - 1) * t * t + 1) + b;
      }
        
      // Initializing the parameters with its values
      var t = 5;
      var b = 10;
      var c = 40;
      var d = 12;
  
      // Calling the easeOutCubic() function over
      // the specified parameter values
      console.log(fabric.util.ease.easeOutCubic(t, b, c, d)); 
    </script>
</body>
  
</html>


Output:

42.06018518518519


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