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How to find the complexity of a Line instance using FabricJS?

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2023-08-31 17:45:07565browse

如何使用 FabricJS 查找 Line 实例的复杂度？

In this tutorial, we will learn how to find the complexity of a line 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 an instance of fabric.Line, specifying the x and y coordinates of the line and adding it to the canvas. To get the complexity of a Line object, we use the complexity method. If the current object inherits directly from the base class rather than a subclass, this method will return 1.

Syntax

 complexity(): Number

Using complexity methods

Example

Let’s look at a code example to see the complexity of getting a Line instance using complexity methods The recorded output. Complexity is 1 unless subcategorizing. 

<!DOCTYPE html>
<html>
<head>
   <!-- Adding the Fabric JS Library-->
   <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
   <h2>Using the complexity method</h2>
   <p>You can open console from dev tools and see the logged output</p>
   <canvas id="canvas"></canvas>
   <script>
      
      // Initiate a canvas instance
      var canvas = new fabric.Canvas("canvas");
      canvas.setWidth(document.body.scrollWidth);
      canvas.setHeight(250);
      
      // Initiate a Line object
      var line = new fabric.Line([70, 100, 150, 200], {
         stroke: "blue",
      });
      
      // Add it to the canvas
      canvas.add(line);
      
      // Using the complexity method
      console.log("The complexity of Line instance is: ", line.complexity());
   </script>
</body>
</html>

Using complexity methods to compare different objects

Example

In this example, we use the complexity method to compare the complexity of a line instance and a polygon instance. You can open the console from the development tools to see the difference in complexity. 

<!DOCTYPE html>
<html>
<head>
   <!-- Adding the Fabric JS Library-->
   <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
   <h2>Using the complexity method to compare different objects</h2>
   <p>You can open console from dev tools and see that the complexities are different
   </p>
   <canvas id="canvas"></canvas>
   <script>
      
      // Initiate a canvas instance
      var canvas = new fabric.Canvas("canvas");
      canvas.setWidth(document.body.scrollWidth);
      canvas.setHeight(250);
      
      // Initiate a Line object
      var line = new fabric.Line([70, 100, 150, 200], {
         stroke: "blue",
      });
      
      // Initiate a Polygon object
      var polygon = new fabric.Polyline(
         [
            { x: 50, y: 30 },
            { x: 105, y: 10 },
            { x: 160, y: 30 },
            { x: 100, y: 150 },
         ],
            {
               fill: "red",
               left: 300,
               top: 70,
            }
      );
      
      // Add both to the canvas
      canvas.add(line);
      canvas.add(polygon);
      
      // Using the complexity method
      console.log("The complexity of Line instance is: ", line.complexity());
      console.log(
         "The complexity of Polygon instance is: ",
         polygon.complexity()
      );
   </script>
</body>
</html>

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