Fabric.js setAlpha() Method

0 1 1 minute read

The setAlpha() method is used to set the value of alpha channel for the specified color.

Syntax:

setAlpha(alpha)

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

alpha: This parameter holds the specified alpha channel value.

Return Value: This method returns specified color value in the format of RGBA along with the given alpha channel value.

Example 1:

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
  <!-- Adding the FabricJS library -->
  <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js"> 
  </script> 
</head> 
  
<body> 
<script type="text/javascript"> 
  
 // Calling the setAlpha() function over 
 // the specified color values 
 console.log(new fabric.Color("hsl(0, 100%, 50%)").setAlpha(0.4)); 
</script> 
  
</body> 
  
</html>

Output:

{"_source":[255,0,0,0.4]}

Example 2:

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
  <!-- Adding the FabricJS library -->
  <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js"> 
  </script> 
</head> 
  
<body> 
<script type="text/javascript"> 
  
 // Initializing some color values in different color format 
 var A = "hex(fff00f)"; 
 var B = "hsl(12, 13%, 25%)"; 
 var C = "hsla(10, 40%, 13%, 0.6)"; 
 var D = "rgb(10, 40, 13)"; 
 var E = "rgba(10, 40, 13, 0.9)"; 
  
 // Calling the setAlpha() function over 
 // the above specified color values 
 console.log(new fabric.Color(A).setAlpha(0)); 
 console.log(new fabric.Color(B).setAlpha(0.4)); 
 console.log(new fabric.Color(C).setAlpha(0.2)); 
 console.log(new fabric.Color(D).setAlpha(0.7)); 
 console.log(new fabric.Color(E).setAlpha(0.9)); 
</script> 
  
</body> 
  
</html>

Output:

{"_source":[0,0,0,0]}
{"_source":[72,59,55,0.4]}
{"_source":[46,24,20,0.2]}
{"_source":[10,40,13,0.7]}
{"_source":[10,40,13,0.9]}

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