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Set Background Colour of Rectangle Selection using Fabric.js
In this tutorial, we are going to learn how to set the background colour of selection of 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.
We can change an object's dimensions, rotate it or manipulate it when it is actively selected. We can change the background colour of selection of Rectangle by using the selectionBackgroundColor property.
Syntax
new fabric.Rect({ selectionBackgroundColor : String }: 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 selectionBackgroundColor is a property.
Options keys
selectionBackgroundColor This property accepts a String value. The value that is assigned will determine the background colour of the selection.
Example 1
Default colour when selectionBackgroundColor property is not used
Let’s see a code example to understand how the selection appears when the selectionBackgroundColor property is not used. As we can see from this example, the selection area or the area behind the object has no 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>Default colour when selectionBackgroundColor property is not used</h2>
<p>You can click on the rectangle to see that the selection area has no colour</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: 155,
top: 70,
width: 170,
height: 70,
fill: "#00b7eb",
stroke: "#ffa089",
strokeWidth: 5,
padding: 50,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
Example 2
Passing selectionBackgroundColor property as key
In this example, we are assigning a value to the selectionBackgroundColor property. In this case, we have passed it the hexadecimal value “#e0ffff” which is a light cyan colour and hence the selection area appears to be of that 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 selectionBackgroundColor property as key</h2>
<p>You can click on the rectangle to see that the selection area now has a light cyan colour</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: 155,
top: 70,
width: 170,
height: 70,
fill: "#00b7eb",
stroke: "#ffa089",
strokeWidth: 5,
padding: 50,
selectionBackgroundColor: "#e0ffff",
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
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