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Fabric.js | Polygon lockUniScaling Property

  • Last Updated : 27 Aug, 2020

In this article, we are going to see how to lock non-uniform scaling of a canvas polygon using FabricJS so that the aspect ratio of the object is maintained. 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 lock the non-uniform scaling of the canvas polygon using lockUniScaling property and render the polygon on the Canvas as given in the example below.

Syntax:

fabric.Polygon([ 
    { x: pixel, y: pixel }, 
    { x: pixel, y: pixel }, 
    { x: pixel, y: pixel }, 
    { x: pixel, y: pixel }, 
    { x: pixel, y: pixel }],
    {
                lockUniScaling: Boolean
    }
)

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

  • lockUniScaling: It is a boolean value that specifies whether to lock non-uniform scaling or not.

Note: The dimension pixels are a must for creating a polygon.



Below example illustrates the Polygon lockUniScaling Property in JavaScript:

Example:

HTML




 

Output:

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