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How to add shadow to a Textbox using FabricJS?
In this tutorial, we are going to learn how to add a shadow to a Textbox using FabricJS. We can customize, stretch or move around the text written in a textbox. In order to create a textbox, we will have to create an instance of fabric.Textbox class and add it to the canvas. Our textbox object can be customized in various ways like changing its dimensions, adding a background color, or even adding a shadow to it. We can add a shadow to the textbox by using the shadow property.
Syntax
new fabric.Textbox(text: String, { shadow : fabric.Shadow }: 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 colour, cursor, stroke width and a lot of other properties can be changed related to the object of which shadow is a property.
Options Keys
shadow This property accepts a fabric.Shadow object which allows us to add a shadow to our Textbox object. For example, in order to add a shadow to our Textbox object we need to create a new instance of fabric.Shadow and then assign that instance to shadow property.
Example 1
Passing the shadow object to the shadow property
Let’s see a code example to understand how we can assign the shadow property a value such that a shadow is added to our textbox object. Firstly, we need to make a new instance of fabric.Shadow and then assign that instance to our shadow property.
<!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 the shadow object to the shadow property</h2>
<p>You can see that a blue shadow has been added to the textbox</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 shadow instance
var shadow = new fabric.Shadow({
color: "blue",
blur: 20,
});
// Initiate a textbox object
var textbox = new fabric.Textbox("Try Again. Fail again. Fail better.", {
backgroundColor: "#fffff0",
width: 400,
left: 110,
top: 70,
fill: "violet",
strokeWidth: 2,
stroke: "blue",
textAlign: "center",
shadow: shadow,
});
// Add it to the canvas
canvas.add(textbox);
</script>
</body>
</html>
Example 2
Passing an RGBA value to the shadow object
We can also adjust the shadow and give it a blurred out appearance by assigning it an RGBA value which stands for red, green, blue and alpha. Alpha determines the opacity of the colour.
<!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 an RGBA value to the shadow object</h2>
<p>You can see the shadow created using RGBA colour value</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 shadow instance
var shadow = new fabric.Shadow({
color: "rgba(0,0,205, 0.7)",
blur: 20,
});
// Initiate a textbox object
var textbox = new fabric.Textbox("Try Again. Fail again. Fail better.", {
backgroundColor: "#fffff0",
width: 400,
left: 110,
top: 70,
fill: "violet",
strokeWidth: 2,
stroke: "blue",
textAlign: "center",
shadow: shadow,
});
// Add it to the canvas
canvas.add(textbox);
</script>
</body>
</html>
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