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How to flip a rectangle horizontally using FabricJS?

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2023-08-24 18:05:08617browse

如何使用 FabricJS 水平翻转矩形？

In this tutorial, we will learn how to flip a Rectangle object horizontally using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a rectangle, we must create an instance of the Fabric.Rect class and add it to the canvas. We can flip the rectangular object horizontally using the flipX property.

Syntax

new fabric.Rect({ flipX: Boolean }: Object)

Parameters

  • Options (optional) - This parameter is a ## that provides additional customization #Object to our rectangle. Using this parameter, you can change the color, cursor, stroke width, and other properties related to the object with FlipX as the attribute.

Option Key

  • flipX - This property accepts a Boolean value that allows We flip the object horizontally.

Example 1

Passing flipX as a key with a value of "false"

Let's look at a code example that shows us the default orientation of a rectangle object in FabricJS. Since we passed a False value to the

flipX property, the rectangular object will not flip horizontally. 

<!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>Passing flipX as key with a False value</h2>
   <p>You can see that the object is not flipped horizontally</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 rectangle object
      var rect = new fabric.Rect({
         left: 125,
         top: 90,
         width: 170,
         height: 70,
         borderColor: "purple",
         borderScaleFactor: 3,
         flipX: false,
      });

      // Create gradient fill
         rect.set(
            "fill",
            new fabric.Gradient({
               type: "linear",
               coords: { x1: 0, y1: 0, x2: 50, y2: 0 },
               colorStops: [
                  { offset: 0, color: "pink" },
                  { offset: 1, color: "blue" },
               ],
            })
         );

      // Add it to the canvas
      canvas.add(rect);
   </script>
</body>
</html>

Example 2

Passing the flipX attribute as a key with a value of "true"

In this example, We have a rectangular object with a width of 170 and a height of 70 with a horizontal linear gradient fill. When we apply the FlipX property to the rectangular object, it flips horizontally, so we see the gradient flipped as well. 

<!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>Passing the flipX property as key with a True value</h2>
   <p>You can see now that the object has flipped horizontally</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 rectangle object
      var rect = new fabric.Rect({
         left: 125,
         top: 90,
         width: 170,
         height: 70,
         borderColor: "purple",
         borderScaleFactor: 3,
         flipX: true,
      });

      // Create gradient fill
      rect.set(
         "fill",
         new fabric.Gradient({
            type: "linear",
            coords: { x1: 0, y1: 0, x2: 50, y2: 0 },
            colorStops: [
               { offset: 0, color: "pink" },
               { offset: 1, color: "blue" },
            ],
         })
      );

      // Add it to the canvas
      canvas.add(rect);
   </script>
</body>
</html>

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