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How to set the padding of a circle using FabricJS?

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如何使用 FabricJS 设置圆的填充？

In this tutorial, we will learn how to set the padding of a circle using FabricJS. Circles are one of the various shapes provided by FabricJS. In order to create a circle, we must create an instance of the Fabric.Circle class and add it to the canvas. Just as we can specify the position, color, opacity, and size of a circular object within the canvas, we can also set the fill of the circular object. This can be done using the padding attribute.

Syntax

new fabric.Circle({ padding : Number }: Object)

Parameters

Options (optional) - This parameter is a Object Provides additional customization for our circles. Using this parameter, you can change properties related to the object for which padding is an attribute, such as color, cursor, stroke width, and many other properties.

Option Key

Padding - This property accepts numbers value. The assigned value determines the distance between the circular object and its controlling bounding box.

Example 1

Default appearance when padding is not used

Let’s look at it when not usedpadding The code that displays the appearance of a circular object when using the property. As we can see, there is no space between the object and its surrounding control boundaries. This means there is zero padding between the circle and its controlling bounding box.

<!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>Setting the padding of circle using FabricJS</h2>
      <p>Select the object and observe that there is no space between the object and its surrounding controlling borders. This is the default behavior. We haven&#39;t used any <b>padding</b> here. </p>
      <canvas id="canvas"></canvas>

      <script>
         // Initiate a canvas instance
         var canvas = new fabric.Canvas("canvas");
         var circle = new fabric.Circle({
            left: 115,
            top: 50,
            radius: 50,
            fill: "#85bb65"
         });
         canvas.add(circle);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>

Example 2

Passing padding property as key

In this example, we are passing padding property as key with value 7. This means that the distance between the circular object and all of its control borders is 7px.

<!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>Setting the padding of circle using FabricJS</h2>
      <p>Select the object and notice the padding between the object and its controlling border. Here we have set the <b>padding</b> at 10px.</p>
      <canvas id="canvas"></canvas>

      <script>
         // Initiate a canvas instance
         var canvas = new fabric.Canvas("canvas");
         var circle = new fabric.Circle({
            left: 115,
            top: 50,
            padding: 10,
            radius: 50,
            fill: "#85bb65"
         });
         canvas.add(circle);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>

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对象内边距 padding fabric

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