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Fabric.js Polygon lockSkewingY Property

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In this article, we are going to see how to lock vertically skewing of a canvas polygon using FabricJS. The canvas polygon means the polygon is movable and can be stretched according to requirement. Further, the polygon 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 polygon. After this, we will initialize instances of Canvas and polygon provided by FabricJS and set the lockSkewingY of canvas polygon using lockSkewingY property and render the polygon on the Canvas as given in the below example.


    { x: pixel, y: pixel }, 
    { x: pixel, y: pixel }, 
    { x: pixel, y: pixel}, 
    { x: pixel, y: pixel}, 
    { x: pixel, y: pixel }],
        lockSkewingY: Boolean

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

  • lockSkewingY: It specifies whether to lock vertical skewing of a polygon canvas or not.

Note: Dimension pixels is must to create a polygon.

Below examples illustrate the Fabric.JS Polygon lockSkewingY property in JavaScript:



<!DOCTYPE html> 
    <!-- Loading the FabricJS library -->
    <script src
    <div style="text-align: center;width: 600px;"
        <h1 style="color: green;"
            Fabric.js | Polygon lockSkewingY Property 
    <canvas id="canvas"
            style="border:1px solid #000000;"
        // Initiate a Canvas instance 
        var canvas = new fabric.Canvas("canvas"); 
        // Initiate a polygon instance 
        var polygon = new fabric.Polygon([ 
        { x: 295, y: 10 }, 
        { x: 235, y: 198 }, 
        { x: 385, y: 78}, 
        { x: 205, y: 78}, 
        { x: 355, y: 198 }], { 
            lockSkewingY: true 
        // Render the polygon in canvas 


Last Updated : 01 Sep, 2020
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