FabricJS - How to move a Line object one step down in the draw object stack?

In this tutorial, we will learn how to move a Line object one step down the draw object stack using FabricJS. Line element is one of the basic elements provided in FabricJS. It is used to create straight lines. Since line elements are geometrically one-dimensional and contain no interiors, they are never filled. We can create a line object by creating a fabric.Line instance, specifying the x and y coordinates of the line and adding it to the canvas. To move the Line object one step down the draw object stack, we use the sendBackwards method.

Syntax

 sendBackwards(intersecting: Boolean): fabric.Object 

Parameters

• Intersect - This parameter accepts Boolean valuesWhen specified as a "true" value, the object will be sent behind the next lower intersecting object. If the value is "false", it normally sends the object after the next object on the stack. This parameter is optional.

Using the sendBackwards method

Example

Let’s look at a code example to see how to use the sendBackwards method time output. sendBackwards method moves the object one step down in the draw object stack. In this example, line2 is sent after line1 using the sendBackwards method.

   
   



   
Using sendBackwards method
   

      You can see that line2 (red) has been moved down in the stack of drawn objects
   
   
   

Use the sendBackwards method and enable three objects and enable the intersection key

Example

In this example, we use three line objects, line1, line2 and line3. Although they have been added to the canvas in numerical order, line3 is clearly behind line1. This is because we are using the sendBackwards method with intersection key enabled, which sends line3 to its next lower intersection object (i.e. line1) later. p>

   
   



   
Using sendBackwards method with three objects and intersection key enabled
   

      You can see that the green line now lies behind the blue line which is line number 1
   
   
   

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