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How to set the border scale factor of Rectangle using FabricJS?
In this tutorial, we are going to set the border scale factor of 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.
We can use the borderScaleFactor property which specifies the scale factor of the object's controlling borders.
Syntax
new fabric.Rect({ borderScaleFactor: Number }: Object)Parameters
Options (optional) − This parameter is an Object which provides additional customizations to our rectangle. 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 borderScaleFactor is a property.
Options keys
borderScaleFactor − This property accepts a Number which specifies the border thickness. The default value is 1.
Example 1
Default behaviour of borderScaleFactor property
Let’s see a code example that depicts the default behaviour of the borderScaleFactor property. Although we have specified it in this example, by default the value that borderScaleFactor uses even when unspecified is 1.
<!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 behaviour of borderScaleFactor property</h2>
<p>Select the rectangle to see the default value of <b>borderScaleFactor</b></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: 125,
top: 90,
width: 170,
height: 70,
fill: "#cf1020",
padding: 9,
borderColor: "black",
borderScaleFactor: 1,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>Example 2
Passing borderScaleFactor as key
Let’s see a code example to increase the border thickness of the rectangle object when it is actively selected. In this example we have assigned the borderScaleFactor a value of 5 which specifies the thickness of our border.
<!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 borderScaleFactor as key</h2>
<p>Select the rectangle to see the changed value of <b>borderScaleFactor</b></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: 125,
top: 90,
width: 170,
height: 70,
fill: "#cf1020",
padding: 9,
borderColor: "black",
borderScaleFactor: 5,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
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