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How to get an SVG representation of a line using FabricJS?

王林
王林forward
2023-08-31 17:57:111233browse

如何使用 FabricJS 获取线条的 SVG 表示？

In this article, we will learn how to get the SVG representation 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 SVG representation of a Line object, we use the _toSVG method.

Syntax

 _toSVG(): Array

Not using _toSVGMethod

Example

Let’s look at a code example to see how to use The output logged when using the _toSVG method is not used. The _toSVG method returns a string array containing the specific svg representation of the instance. However, since we are not using the _toSVG method, we will not be able to see the string array in the console. The default values ​​for Line objects are documented to illustrate this point. 

<!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>Without using _toSVG 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);
      
      // Console logging the Line object
      console.log("The Line object is as follows: ", line);
   </script>
</body>
</html>

Use _toSVGmethod

Example

In this example, we use the _toSVG method to get a string array containing the svg representation of the object. 

<!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 _toSVG method</h2>
   <p>
      You can open console from dev tools and see that the logged output contains an array of strings containing the svg representation of the Line object
   </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 _toSVG method
      console.log(
         "The svg representation of the Line object is as follows: ",
         line._toSVG()
      );
   </script>
</body>
</html>

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