Fabric.js Textbox minScaleLimit Property

Last Updated : 20 Jan, 2021

In this article, we are going to see how to set the minimum allowed scale limit of a canvas Textbox using FabricJS so that the aspect ratio of the object is maintained. The canvas means Textbox is movable and can be stretched according to requirement. Further, the Textbox can be customized when it comes to initial stroke color, fill color, stroke width, or radius.

Approach:

To make it possible, we are going to use a JavaScript library called FabricJS.
After importing the library using CDN, we will create a canvas block in the body tag that will contain our Textbox .
After this, we will initialize instances of Canvas and Textbox provided by FabricJS and set the minimum allowed scale limit of the canvas Textbox using minScaleLimit property, and render the Textbox on the Canvas as given in the below example.

Syntax:

fabric.Textbox('text', {
   minScaleLimit: number
});

Parameters: This function accepts one parameter as mentioned above and described below:

minScaleLimit: It specifies the minimum scale limit.

Example: This example uses FabricJS to set the minimum allowed scale limit of a canvas textbox.

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        Fabric.js | Textbox minScaleLimit Property 
    </title> 
  
    <!-- Adding the FabricJS library -->
    <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js"> 
    </script> 
</head> 
  
<body> 
    <h1 style="color: green;"> 
        GeeksforGeeks 
    </h1> 
  
    <h3> 
        Fabric.js | Textbox minScaleLimit Property 
    </h3> 
  
    <canvas id="canvas" width="600" height="300" 
        style="border:1px solid #000000"> 
    </canvas> 
  
    <script> 
  
        // Initiate a Canvas instance  
        var canvas = new fabric.Canvas("canvas"); 
  
        // Create a new Textbox instance  
        var text = new fabric.Textbox( 
            'A Computer Science Portal', { 
            width: 500, 
            minScaleLimit: 2 
        }); 
  
        // Render the Textbox in canvas  
        canvas.add(text); 
        canvas.centerObject(text); 
    </script> 
</body> 
  
</html>