Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to add dashed stroke to a Rectangle using FabricJS?
In this tutorial, we are going to learn how to add a dashed stroke to a Rectangle using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a rectangle, we will have to create an instance of fabric.Rect class and add it to the canvas. The strokeDashArray property allows us to specify a dash pattern for the object's stroke.
Syntax
new fabric.Rect( { strokeDashArray: Array }: Object)Parameters
Options (optional) − This parameter is an Object which provides additional customizations to our rectangle. Using this parameter colour, cursor, stroke width and a lot of other properties can be changed related to the object of which strokeDashArray is a property.
Options Keys
strokeDashArray − This property allows us to specify a dash pattern for the object’s stroke. We can achieve this by passing it an Array. For example, if we pass an array with values [2,3], it means a dash pattern of 2px dash and 3px gap and repeating this pattern infinitely.
Example 1
Default appearance of an object’s stroke
Let’s see a code example that depicts the default appearance of the stroke of a rectangle object. Since we have not used the strokeDashArray property, there is no dash pattern being displayed.
<!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 appearance of an object’s stroke</h2>
<p>You can see that there is no dashed stroke on the rectangle</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 rectangle object
var rect = new fabric.Rect({
left: 55,
top: 70,
width: 170,
height: 70,
fill: "#f4f0ec",
stroke: "#2a52be",
strokeWidth: 7,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>Example 2
Passing strokeDashArray property as key
In this example, we are passing the strokeDashArray property a value of [9,2]. This means that a dash pattern will be created such that there is a 9px long line followed by a 2px gap, then again a 9px long line will be drawn, and so on.
<!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 strokeDashArray property as key</h2>
<p>You can see now a dashed stroke has been added around the rectangle</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 rectangle object
var rect = new fabric.Rect({
left: 55,
top: 70,
width: 170,
height: 70,
fill: "#f4f0ec",
stroke: "#2a52be",
strokeWidth: 7,
strokeDashArray: [9, 2],
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
476 Views
