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Fabric.js Polyline flipY Property

  • Last Updated : 28 Aug, 2020
Geek Week

In this article, we are going to see how to set the vertically flip of a canvas polyline in FabricJS. The canvas polyline means the polyline is movable and can be stretched according to requirement. 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 use the flipY property to vertically flip the polyline and render the Canvas on the polyline as given in the example below.

Syntax :

var polyline = new fabric.Polyline(Points, { 
            flipY : boolean

Parameters: This function accepts two parameters as mentioned above and described below –

  • points: It holds the starting and ending coordinates for all the points of the polyline.
  • flipY: It specifies the vertically flip of a canvas object.

Example :


<!DOCTYPE html> 
        Fabric.js | Polyline flipY Property 
    <!-- Loading the FabricJS library -->
    <script src
        <div style="text-align: center;width: 600px;"
        <h1 style="color: green;"
            Fabric.js | Polyline flipY Property 
    <canvas id="canvas"
            style="border:1px solid #000000;"
        // 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  }], { 
            flipY : true,
        // Render the Polyline in canvas 

Output :

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