How to create a string representation of a Line object using FabricJS?-JS Tutorial-php.cn

Table of Contents

Syntax

Using toString Method

Example

Use the toString method to compare two different elements

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How to create a string representation of a Line object using FabricJS?

Aug 28, 2023 pm 05:21 PM

如何使用 FabricJS 创建 Line 对象的字符串表示形式？

In this tutorial, we will learn how to create a string representation of a Line object 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 create a string representation of a Line object, we use the toString method.

Syntax

1	`toString(): String`

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Using toString Method

Example

Let’s look at a code example to see how to use toString Method is used to record the output. In this case, a string representation of the line instance is returned.

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
   &lt;!-- Adding the Fabric JS Library--&gt;
   &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
   &lt;h2&gt;Using the toString method&lt;/h2&gt;
   &lt;p&gt;
      You can open console from dev tools and see that the logged output contains the String representation of the line instance
   &lt;/p&gt;
   &lt;canvas id="canvas"&gt;&lt;/canvas&gt;
   &lt;script&gt;
       
      // 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([200, 100, 100, 40], {
         stroke: "blue",
         strokeWidth: 20,
      });
       
      // Add it to the canvas
      canvas.add(line);
       
      // Using the toString method
      console.log(
         "String representation of the Line instance is: ",
         line.toString()
      );
   &lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;

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Use the toString method to compare two different elements

Example

Let's look at a code example to see how to compare two objects by looking at their respective string representations. Here we initialize a line instance and a rectangle instance. As we apply the toString method to each object, we can see their respective string representations in the console.

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
   &lt;!-- Adding the Fabric JS Library--&gt;
   &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
   &lt;h2&gt;Using toString method to compare two different elements&lt;/h2&gt;
   &lt;p&gt;
      You can open console from dev tools and see that the logged output contains the String representation of the line instance and the rectangle instance
   &lt;/p&gt;
   &lt;canvas id="canvas"&gt;&lt;/canvas&gt;
   &lt;script&gt;
      // 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([200, 100, 100, 40], {
         stroke: "blue",
         strokeWidth: 20,
      });
      // Initiate a Rectangle object
      var rect = new fabric.Rect( {
         stroke: "red",
         strokeWidth: 20,
         width:20,
         height: 50,
         left: 400,
         top: 55
      });
      // Add them to the canvas
      canvas.add(line);
      canvas.add(rect)
      // Using the toString method
      console.log(
         "String representation of the Line instance is: ", line.toString()
      );
      console.log(
         "String representation of the Rectangle instance is: ",
         rect.toString()
      );
   &lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;

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