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Fabric.js | Triangle lockMovementY Property

  • Last Updated : 27 May, 2020

In this article, we are going to see how to lock the vertical movement of the canvas triangle using FabricJS. The canvas triangle means the triangle is movable and can be stretched according to requirement. Further, the triangle 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 triangle. After this, we will initialize instances of Canvas and Triangle provided by FabricJS and lock the vertical movement of the canvas triangle using lockMovementY property and render the Triangle on the Canvas as given in the below example.

Syntax:

fabric.Triangle({
    width: number,
    height: number,
    lockMovementY: boolean
});

Parameters: This function accepts three parameters as mentioned above and described below:

  • width: It specifies the width of triangle.
  • height: It specifies the height of triangle.
  • lockMovementY: It specifies whether to lock vertical movement of canvas.

Example: This example uses FabricJS to lock the vertical movement of the canvas triangle as given below.




<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        Fabric.js | Triangle lockMovementY Property
    </title> 
      
    <!-- Adding the FabricJS library -->
    <script src= 
    </script> 
</head> 
  
<body> 
    <center>
      <h1 style="color: green;">
        GeeksforGeeks
      </h1>
      <b>
        Fabric.js | Triangle lockMovementY Property
      </b>
    </center>
    <canvas id="canvas" width="600" height="300"
        style="border:1px solid #000000"
    </canvas> 
      
    <script> 
      
        // Initiate a Canvas instance 
        var canvas = new fabric.Canvas("canvas"); 
  
        // Initiate a triangle instance 
        var triangle = new fabric.Triangle({
            width: 300,
            height: 150,
            fill: '',
            stroke: 'green',
            strokeWidth: 3,
            lockMovementY: true
        });
  
        // Render the Triangle in canvas 
        canvas.add(triangle); 
        canvas.centerObject(triangle);
    </script> 
</body> 
  
</html>

Output:




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