Fabric.js 5 is a powerful JavaScript library for working with HTML5 canvas, offering an extensive range of features for creating and manipulating graphical objects. One common requirement in canvas applications is the ability to delete selected objects. In this blog, we will dive into the implementation of programmatically deleting selected objects in Fabric.js 5. By following this tutorial, you will gain a comprehensive understanding of how to leverage the remove method and apply it to various object types such as polygons and circles.

Understanding the Fabric.js 5 Polygon Object and Delete Operation

Overview of the fabric.Polygon object in Fabric.js 5

The fabric.Polygon object in Fabric.js 5 is a fundamental element that allows the creation of closed shapes consisting of connected straight line segments. Let's take a look at an example of creating a fabric.Polygon object:

// Initialize a canvas instance

     var canvas = new fabric.Canvas("canvas");

     canvas.setWidth(document.body.scrollWidth);

     canvas.setHeight(250);

  // Define the points for the first polygon

  var points1 = [

     { x: 30, y: 50 },

     { x: 70, y: 50 },

     { x: 0, y: 0 },

     { x: 70, y: 0 }

  ];

  // Create the first fabric.Polygon object

  var polygon1 = new fabric.Polygon(points1, {

     left: 100,

     top: 40,

     fill: "#1e90ff",

     strokeWidth: 4,

     stroke: "black",

     scaleX: 1.2,

     scaleY: 1.2

  });

  // Define the points for the second polygon

  var points2 = [

     { x: 60, y: 90 },

     { x: 45, y: 30 },

     { x: 20, y: 48 }

  ];

  // Create the second fabric.Polygon object

  var polygon2 = new fabric.Polygon(points2, {

     left: 30,

     top: 30,

     fill: "#080808",

     strokeWidth: 4,

     stroke: "red",

     scaleX: 2,

     scaleY: 2

  });

  // Add both polygon objects to the canvas

  canvas.add(polygon1, polygon2);

In this example, we define an array of points that represent the vertices of the polygon. We then create a fabric.Polygon object using these points and customize its appearance by specifying properties like fill color, stroke color, stroke width, and scaling.

Introduction to the remove method for deleting objects

The remove method is a crucial feature in Fabric.js 5 that allows the deletion of objects from the canvas. Let's see how the remove method works with an example:

// Removing an object from the canvas using the remove method

canvas.remove(polygon);

In this example, the remove method is called on the canvas, specifying the object (in this case, the polygon) to be removed. This will instantly remove the polygon object from the canvas, effectively deleting it from the graphical representation.

By understanding the fabric.Polygon object and the remove method, you gain the necessary knowledge to implement the delete operation selectively for objects in your Fabric.js 5 applications. In the following sections, we will delve deeper into the practical implementation of this functionality, providing code examples and step-by-step instructions for achieving the desired outcome.

Implementing Delete Operation for Selected Polygon Objects Programmatically

Implementing the deletePolygonHandler function for removing selected polygons:

In order to enable the delete operation for selected polygon objects in Fabric.js 5, we can implement a deletePolygonHandler function that will be triggered when a mouse:down event occurs. This function will identify the selected object and remove it from the canvas using the remove method. Let's take a look at the code example:

This function will identify the selected object and remove it from the canvas using the remove method. Let's take a look at the code example:

// Initiating the deleteHandler function

var deletePolygonHandler = function(obj) {

   var selectedObject = obj.target;

   canvas.remove(selectedObject);

   canvas.renderAll();

};

// Binding the deleteHandler function to the mouse:down event

canvas.on

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