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Fabric.js Polygon objectCaching Property

  • Last Updated : 20 Jan, 2021

In this article, we are going to see the objectCaching property of a polygon canvas using FabricJS. The canvas polygon means the polygon is movable and can be stretched according to requirements. 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 objectCaching of canvas polygon using objectCaching property, and render the polygon on the Canvas as given in the below example.

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Syntax:

fabric.Polygon([
    { x: pixel, y: pixel },
    { x: pixel, y: pixel },
    { x: pixel, y: pixel},
    { x: pixel, y: pixel},
    { x: pixel, y: pixel }
],
{
    objectCaching : boolean
});

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



  • objectCaching: When `true`, the object is cached on an additional canvas. When `false`, the object is not cached unless necessary ( clipPath ) default to true

Below examples illustrate the Fabric.JS Polygon objectCaching in JavaScript:

Example:

HTML




<!DOCTYPE html> 
<html
  
<head
  
    <!-- Loading the FabricJS library -->
    <script src
    </script
</head
  
<body
    <div style="text-align: center;width: 600px;"
        <h1 style="color: green;"
            GeeksforGeeks 
        </h1
        <b
            Fabric.js | Polygon objectCaching 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 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 }], { 
             objectCaching: 'false' 
  
        }); 
  
        // Render the polygon in canvas 
        canvas.add(polygon); 
    </script
</body
  
</html>

Output:




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