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How a Polygon is different from a Polyline in FabricJS?
We can create a Polyline object by creating an instance of fabric.Polyline while fabric.Polygon can be used to create a Polygon instance. A polyline object can be characterised by a set of connected straight-line segments. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity etc.
A polygon always connects the first point to the last to make a closed area while a polyline doesn’t. This can be proved by the examples given below.
Syntax
new fabric.Polyline(points: Array, options: Object)
Parameters
points − This parameter accepts an Array which denotes the array of points that make up the polyline object.
options (optional) − This parameter is an Object which provides additional customizations to our object. Using this parameter origin, stroke width and a lot of other properties can be changed related to the Polyline object.
Example 1
Creating an Instance of fabric.Polyline() and Adding it to the Canvas
Let’s see a code example of how we can add a polyline object to our canvas. The only required parameter is the points Array whereas the second argument is the optional options object. Further, we will use the same points Array in Polygon too to prove the difference.
<!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.Polyline() and adding it to our canvas</h2>
<p>You can see that the polyline object doesn’t connects start to end</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiating a points array
var points = [
{ x: 200, y: 150 },
{ x: 0, y: 100 },
{ x: 100, y: 0 },
{ x: 200, y: 100 },
];
// Initiating a polyline object
var polyline = new fabric.Polyline(points, {
left: 100,
top: 40,
fill: "white",
strokeWidth: 4,
stroke: "green",
});
// Adding it to the canvas
canvas.add(polyline);
</script>
</body>
</html>
Example 2
Creating an Instance of fabric.Polygon() and Adding it to our Canvas
Let’s see a code example of how we can add a polygon object to our canvas. The only required parameter is the points Array whereas the second argument is the optional options object both of which we will provide the same as in the polyline example.
<!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.Polygon() and adding it to our canva</h2>
<p>You can see that the polygon object connects start to end to make a closed area</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiating a points array
var points = [
{ x: 200, y: 150 },
{ x: 0, y: 100 },
{ x: 100, y: 0 },
{ x: 200, y: 100 },
];
// Initiating a polyline object
var polygon = new fabric.Polygon(points, {
left: 100,
top: 40,
fill: "white",
strokeWidth: 4,
stroke: "green",
});
// Adding it to the canvas
canvas.add(polygon);
</script>
</body>
</html>
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