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How to create a Triangle with background colour using FabricJS?
In this tutorial, we are going to create a Triangle with background colour 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.
The backgroundColor property allows us to assign a colour to our object's background. It is the colour of the container where the Triangle lives and is rectangular in shape for the triangle.
Syntax
new fabric.Triangle({ backgroundColor: String }: 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 of which backgroundColor is a property.
Options Keys
backgroundColor − This property accepts a value of type String which will determine the background colour.
Example 1
Passing backgroundColor property as key with a hexadecimal value
Let's see a code example to assign a background colour to our Triangle object using a hexadecimal value of colour. In this example, we have used the hex colour code #ff0000 which represents the colour red.
<!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 backgroundColor property as key with a hexadecimal value</h2>
<p>You can see the new background colour on 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 triangle object
var triangle = new fabric.Triangle({
left: 55,
top: 60,
width: 100,
height: 70,
fill: "blue",
stroke: "#2a52be",
backgroundColor: "#ff0000",
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html>Example 2
Passing backgroundColor property as key with a rgba value
We can use an RGBA value, instead of a hexadecimal colour code, which stands for: red, green, blue and alpha. The alpha parameter specifies the opacity of a colour. In this example, we have used the rgba value (255,20,147,0.8) which is the colour pink with 0.8 opacity.
<!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 backgroundColor property as key with a rgba value</h2>
<p>You can see the new background colour on 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 triangle object
var triangle = new fabric.Triangle({
left: 55,
top: 60,
width: 100,
height: 70,
fill: "#deb887",
backgroundColor: "rgba(255,20,147,0.8)",
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html>
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