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Add Shadow to a Triangle Using Fabric.js
In this tutorial, we are going to learn how to add a shadow to a Triangle using FabricJS. Triangle is one of the various shapes provided by FabricJS. In order to create a triangle, we will have to create an instance of fabric.Triangle class and add it to the canvas.
Our triangle 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 triangle by using the shadow property.
Syntax
new fabric.Triangle({ shadow : fabric.Shadow }: Object)
Parameters
Options (optional) This parameter is an Object which provides additional customizations to our triangle. 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 shadow is a property.
Options Keys
Shadow This property accepts a fabric.Shadow object which allows us to add a shadow to our triangle object.
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 triangle 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 an orange shadow has been added to the triangle</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: "orange",
blur: 20,
});
// Initiate a triangle object
var triangle = new fabric.Triangle({
left: 120,
top: 70,
width: 90,
height: 80,
fill: "#228b22",
stroke: "#d8e4bc",
strokeWidth: 7,
shadow: shadow,
});
// Add it to the canvas
canvas.add(triangle);
</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(139,0,139,0.8)",
blur: 20,
});
// Initiate a triangle object
var triangle = new fabric.Triangle({
left: 120,
top: 70,
width: 90,
height: 80,
fill: "#228b22",
stroke: "#d8e4bc",
strokeWidth: 7,
shadow: shadow,
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html>
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