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Fabric.js | Ellipse borderOpacityWhenMoving Property

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In this article, we are going to see how to set the opacity of the border of moving canvas ellipse using FabricJS. The canvas means ellipse is movable and can be stretched according to requirement. Further, the ellipse can be customized when it comes to initial stroke color, fill color, stroke width, or radius. Approach: To make it possible, we are going to use a JavaScript library called FabricJS. After importing the library using CDN, we will create a canvas block in the body tag that will contain our ellipse. After this, we will initialize instances of Canvas and Ellipse provided by FabricJS and set the opacity of the border of moving canvas ellipse using borderOpacityWhenMoving property and render the Ellipse on the Canvas as given below. Syntax:
    rx: number,
    ry: number,
    borderOpacityWhenMoving: number
Parameters: This function accepts three parameters as mentioned above and described below:
  • rx: It specifies the horizontal radius.
  • ry: It specifies the vertical radius.
  • borderOpacityWhenMoving: It specifies the opacity of border.
Example: This example uses FabricJS to set the opacity of the border of moving canvas-like ellipse as given below.
<!DOCTYPE html>
        Fabric.js | Ellipse borderOpacityWhenMoving Property
    <!-- Loading the FabricJS library -->
    <script src=
    <canvas id="canvas" width="600" height="200" 
        style="border:1px solid #000000">
        // Initiate a Canvas instance
        var canvas = new fabric.Canvas("canvas");
        // Initiate a Ellipse instance
        var ellipse = new fabric.Ellipse({
            rx: 80,
            ry: 40,
            borderOpacityWhenMoving: 0
        // Render the Ellipse in canvas


Last Updated : 13 May, 2020
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