Fabric.js Group visible属性

在本文章中，我们将会看到如何使用Fabric.js来设置画布的Group的visible属性。Fabric.js中的Group可移动并且可根据需要进行拉伸。此外，当涉及到初始描边颜色、高度、宽度、填充颜色或者描边宽度时，Group是可定制的。

为了实现这一功能，我们将使用一个名为Fabric.js的JavaScript库。在导入库后，我们将在body标签中创建一个包含Group的画布块。之后，我们将使用Fabric.js提供的Canvas和Group的实例，并使用visible属性来设置画布Group的可见性。

语法：

fabric.Group([canvas1, canvas2], {
   visible: Boolean
});

参数：此属性接受上述提及并在下面描述的单个参数：

visible： 它指定对象的可见性。

下面的示例展示了在JavaScript中使用Fabric.js Group visible 属性：

<!DOCTYPE html> 
<html> 
  
<head> 
  <!-- FabricJS CDN -->
  <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js"> 
  </script> 
  
</head> 
  
<body> 
    <div style="text-align: center;width: 400px;"> 
      <h1 style="color: green;"> 
          GeeksforGeeks 
      </h1> 
      <b> 
          Fabric.js | Group visible Property 
      </b> 
    </div> 
    
    <div style="text-align: center;"> 
      <canvas id="canvas" width="500" height="300"
      style="border:1px solid green;"> 
      </canvas> 
    </div> 
    
    <script> 
      // Initiate a Canvas instance 
      var canvas = new fabric.Canvas("canvas"); 
        
      // Initiate a circle instance 
      var circle = new fabric.Circle({ 
        radius: 100, 
        fill: 'lightgreen', 
        scaleY: 0.6, 
        originX: 'center', 
        originY: 'center' 
      }); 
  
      // Initiate a text instance 
      var text = new fabric.Text('GeeksforGeeks', { 
        fontSize: 25, 
        originX: 'center', 
        originY: 'center' 
      }); 
  
      // Initiate a Group instance 
      var group = new fabric.Group([ circle, text ], { 
          visible: true 
      }); 
  
      // Render the Group in canvas 
      canvas.add(group); 
  
      // Center the Group in canvas 
      canvas.centerObject(group); 
  </script> 
</body> 
  
</html>

输出：

Fabric.js Group visible属性

示例2：

<!DOCTYPE html> 
<html> 
  
<head> 
  <!-- FabricJS CDN -->
  <script src= 
"https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.6.2/fabric.min.js"> 
  </script> 
  
</head> 
  
<body> 
    <div style="text-align: center;width: 400px;"> 
      <h1 style="color: green;"> 
          GeeksforGeeks 
      </h1> 
      <b> 
          Fabric.js | Group visible Property 
      </b> 
    </div> 
    
    <div style="text-align: center;"> 
      <canvas id="canvas" width="500" height="300"
      style="border:1px solid green;"> 
      </canvas> 
    </div> 
    
    <script> 
      // Initiate a Canvas instance 
      var canvas = new fabric.Canvas("canvas"); 
        
      // Initiate a circle instance 
      var circle = new fabric.Circle({ 
        radius: 100, 
        fill: 'lightgreen', 
        scaleY: 0.6, 
        originX: 'center', 
        originY: 'center' 
      }); 
  
      // Initiate a text instance 
      var text = new fabric.Text('GeeksforGeeks', { 
        fontSize: 25, 
        originX: 'center', 
        originY: 'center' 
      }); 
  
      // Initiate a Group instance 
      var group = new fabric.Group([ circle, text ], { 
          visible: false 
      }); 
  
      // Render the Group in canvas 
      canvas.add(group); 
  
      // Center the Group in canvas 
      canvas.centerObject(group); 
  </script> 
</body> 
  
</html>

输出:

Fabric.js Group visible属性