Fabric.js Polyline top Property

Last Updated : 22 Jan, 2021

In this article, we are going to see how to set the top of the canvas Polyline using FabricJS, it used to fill an object. The canvas Polyline means the Polyline is movable and can be stretched according to requirements. Further, the Polyline can be customized when it comes to initial stroke color, height, width, fill color, or stroke width.

To make it possible we are going to use a JavaScript library called FabricJS. After importing the library, we will create a canvas block in the body tag that will contain the Polyline. After this, we will initialize instances of Canvas and Polyline provided by FabricJS and set the top color of the canvas Polyline using top property, and render the Polyline on the Canvas as given in the below example.

Syntax:

var polyline = new fabric.Polyline(Points, {  
   strokeDashArray: array
 });

Parameters: This property accepts a single parameter as mentioned above and described below:

top: Top position of an object. Note that by default it’s relative to object top. You can change this by setting originY={top/center/bottom}

The below example illustrates the top property in Fabric.js:

Example:

HTML

<!DOCTYPE html>  
<html>  
<head>  
  
    <!-- Loading the FabricJS library -->
    <script src=  
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js">  
    </script>  
</head>  
  
<body>  
        <div style="text-align: center;width: 600px;">  
        <h1 style="color: green;">  
            GeeksforGeeks  
        </h1>  
        <b>  
            Fabric.js | Polyline top Property  
        </b>  
        </div>  
    <canvas id="canvas"
            width="600"
            height="200"
            style="border:1px solid #000000;">  
    </canvas>  
  
    <script>  
  
        // Initiate a Canvas instance  
        var canvas = new fabric.Canvas("canvas");  
  
        // Initiate a polyline instance  
        var polyline = new fabric.Polyline([  
        { x: 200,  
            y: 10 },  
        {x: 250,  
            y: 50  
        }, {  
            x: 250,  
            y: 180  
        }, {  
            x: 150,  
            y: 180  
        }, {  
            x: 150,  
            y: 50  
        }, {  
            x: 200,  
            y: 10 }], {  
            stroke: 'green',   
            strokeWidth: 3,   
            fill: 'yellow', 
            strokeWidth: 3, 
            top: 1 
  
  
        });  
  
        // Render the polyline in canvas  
        canvas.add(polyline);  
    </script>  
</body>  
  
</html>