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How to disable unified scaling in canvas using FabricJS?

WBOYforward: 2023-09-03 20:57:08872browse

如何使用 FabricJS 禁用画布中的统一缩放？

In this article, we will learn how to disable unified scaling in canvas using FabricJS. In FabricJS, when an object is dragged from a corner, the object transforms proportionally. However, we can disable this behavior using the uniformScaling attribute.

Syntax

new fabric.Canvas(element: HTMLElement|String, { uniformScaling: Boolean }: Object)

Parameters

##Element - This parameter is the element itself, Can be derived using
Options (optional) - This parameter is an object that provides additional customization of our canvas. Using this parameter, you can change canvas-related properties such as color, cursor, border width, and many other properties, of which uniformScaling is a property. It accepts a Boolean value that determines whether the object should be scaled proportionally. Its default value is True.

Example: Passing uniformScaling as key with value False

Let's look at a code example to see how an object behaves when

uniformScaling is set to False , the scaling is uneven. Starting with FabricJS version 4, the property uniScaleTransform has been removed and replaced by uniformScaling.

<!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>
   <div style="padding: 10px; font-weight: bold; margin-left: 32px">
      How to disable uniform scaling in canvas using FabricJS?
   </div>
   <canvas
      id="canvas"
      width="500"
      height="300"
      style="border: 2px solid #000000">
   </canvas>

   <script>
      // Initiate a canvas instance
      var canvas = new fabric.Canvas("canvas", {
      // UniformScaling is disabled
         uniformScaling: false
      });
      // Creating an instance of the fabric.Rect class
      var circle = new fabric.Circle({
         left: 70,
         top: 90,
         radius: 40,
         fill: "#006400",
      });

      // Adding it to the canvas
      canvas.add(circle);
   </script>
</body>
</html>

Output

How to disable unified scaling in canvas using FabricJS?

#Example: Pass uniformScaling key to class with value True

Now we have understood how to scale non-uniformly When uniformScaling is False, we can enable uniformScaling to avoid this situation. Let’s see what the code looks like -

<!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>
   <div style="padding: 10px; font-weight: bold; margin-left: 32px">
      How to disable uniform scaling in canvas using FabricJS?
   </div>
   <canvas
      id="canvas"
      width="500"
      height="300"
      style="border: 2px solid #000000">
   </canvas>

   <script>
      // Initiate a canvas instance
      var canvas = new fabric.Canvas("canvas", {
         // UniformScaling is enabled
      uniformScaling: true
      });
      // Creating an instance of the fabric.Rect class
      var circle = new fabric.Circle({
         left: 70,
         top: 90,
         radius: 40,
         fill: "#006400",
      });

      // Adding it to the canvas
      canvas.add(circle);
   </script>
</body>
</html>

output

How to disable unified scaling in canvas using FabricJS?

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