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Fabric.js Polyline lockMovementY Property

  • Last Updated : 22 Jan, 2021

In this article, we are going to see how to lock the vertical movement of the canvas Polyline using 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 lock the horizontal movement of the canvas Polyline using lockMovementY property and render the Polyline on the Canvas as given in the below example.

Syntax:

var polyline = new fabric.Polyline(Points, {  
    lockMovementY : Boolean
});  

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

  • lockMovementY: It is a boolean value that specifies whether to lock Verticallly movement of canvas or not.

The below example illustrates the lockMovementY property in Fabric.js:



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 | Polyline lockMovementY 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 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 }], { 
            stroke: 'green',  
            strokeWidth: 3,  
            cornerStyle: 'circle', 
   
            // Disable movement 
            // along the x-axis 
            lockMovementY: true 
        }); 
  
        // Render the polyline in canvas 
        canvas.add(polyline); 
    </script
</body
  
</html>

Output:




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