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How to create a canvas with Triangle using FabricJS?
In this tutorial, we are going to learn about how to create a canvas with a Triangle object 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.
Syntax
new fabric.Triangle({ width: Number, height: Number }: 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 triangle object of which width and height are properties.
Options Keys
Width This property accepts a Number which specifies the object's width. Its default value is 100.
Height This property accepts a Number which specifies the object's height. Its default value is 100.
Example 1
Creating an instance of fabric.Triangle() and adding it to our canvas
Let's see a code example of how we can add a triangle to our canvas. Here we have created an object with a width of 100px and height of 70 px. Also, we have used the colour "orange" as a fill 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>Creating an instance of fabric.Triangle() and adding it to our canvas</h2>
<p>You can move around the triangle and interact with it</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 triangle object
var triangle = new fabric.Triangle({
left: 55,
top: 60,
width: 100,
height: 70,
fill: "orange",
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html>
Example 2
Manipulating the Triangle object by using the set method
In this example, we have assigned the properties to the triangle by using the set method which is a setter for values. Any property related to stroke, strokeWidth, angle, scaling, rotation etc, can be mutated by using this method.
<!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>Manipulating the Triangle object by using the set method</h2>
<p>You can move around the triangle and interact with it</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 triangle object
var triangle = new fabric.Triangle();
// Set the properties
triangle.set("height", 70);
triangle.set("width", 100);
triangle.set("stroke", "#2a52be");
triangle.set("strokeWidth", 5);
triangle.set("fill", "#d9603b");
triangle.set("top", 60);
triangle.set("left", 55);
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html> 
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