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Set Size of Controlling Corners of Textbox in Fabric.js
In this tutorial, we are going to learn how to set the size of the controlling corners of a Textbox using FabricJS. The controlling corners of an object allow us to scale, stretch or change its position. We can customize our controlling corners in many ways such as adding a specific colour to it, changing its size etc. We can change the size by using the cornerSize property.
Syntax
new fabric.Textbox(text: String, { cornerSize: Number }: Object)
Parameters
text ? This parameter accepts a String which is the text string that we want to display inside our textbox.
options (optional) ? This parameter is an Object which provides additional customizations to our textbox. Using this parameter, properties such as colour, cursor, stroke width and a lot of other properties can be changed related to the object of which cornerSize is a property.
Options Keys
cornerSize ? This property accepts a Number which allows us to manipulate the size of the controlling corners of a selected object. Its default value is 13.
Example 1
Default size of the controlling corners
Let's see a code example that depicts the default size of the controlling corners of a textbox object when it is actively selected.
<!DOCTYPE html> <html> <head> <!-- Adding the Fabric JS Library--> <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script> </head> <body> <h2>Default size of the controlling corners</h2> <p>You can select the textbox to see the default size of the controlling corners</p> <canvas id="canvas"></canvas> <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas"); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); // Initiate a textbox object var textbox = new fabric.Textbox("The best way to teach your kids about taxes is by eating 30 percent of their ice cream.", { backgroundColor: "rgba(204,255,0,0.2)", width: 400, top: 20, left: 110, cornerColor: "#87a96b", }); // Add it to the canvas canvas.add(textbox); </script> </body> </html>
Example 2
Passing cornerSize as key with a custom value
In this example, we are passing the cornerSize property as key with a value of 17. We can see how that changes the size of our controlling corners when the textbox object is selected.
<!DOCTYPE html> <html> <head> <!-- Adding the Fabric JS Library--> <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script> </head> <body> <h2>Passing cornerSize as key with a custom value</h2> <p>You can select the textbox to see the size of the controlling corners</p> <canvas id="canvas"></canvas> <script> // Initiate a canvas instance var canvas = new fabric.Canvas("canvas"); canvas.setWidth(document.body.scrollWidth); canvas.setHeight(250); // Initiate a textbox object var textbox = new fabric.Textbox("The best way to teach your kids about taxes is by eating 30 percent of their ice cream.", { backgroundColor: "rgba(204,255,0,0.2)", width: 400, top: 70, left: 110, cornerColor: "#87a96b", cornerSize: 17, }); // Add it to the canvas canvas.add(textbox); </script> </body> </html>
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