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How to lock the vertical tilt of Ellipse using FabricJS?

王林
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2023-09-01 15:05:10801browse

如何使用 FabricJS 锁定 Ellipse 的垂直倾斜？

In this tutorial, we will learn how to lock the vertical tilt of an ellipse using FabricJS. Just as we can specify the position, color, opacity, and size of the elliptical object in the canvas, we can also specify whether we want to stop tilting the object vertically. This can be done using the lockSkewingY property.

Syntax

new fabric.Ellipse({ lockSkewingY : Boolean }: Object)

Parameters

  • Options (optional) - This parameter is a Object Provides additional customization for our ellipse. Using this parameter, you can change the color, cursor, stroke width, and many other properties associated with the object for which lockSkewingY is the property.

Option Key

  • ##lockSkewingY - This property accepts a Boolean Value强>value. If we give it a "true" value, the object's vertical tilt will be locked.

Example 1

Default Behavior Ellipse Object in Canvas

Let's look at an example to understand the unused

lockSkewingY property is the default behavior of the Ellipse object. You can tilt an object horizontally and vertically by pressing the shift key and then dragging horizontally or vertically. 

<!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>How to lock the vertical skewing of Ellipse using FabricJS?</h2>
      <p>Select the object and stretch it horizontally or vertically by pressing the <b>shift</b> key. The object will get skewed. This is the default behavior. Here we have not applied the <b>lockSkewing</b> property. </p>
      <canvas id="canvas"></canvas>

      <script>
         // Initiate a canvas instance
         var canvas = new fabric.Canvas("canvas");

         // Initiate an ellipse instance
         var ellipse = new fabric.Ellipse({
            left: 115,
            top: 50,
            fill: "white",
            rx: 80,
            ry: 50,
            stroke: "black",
            strokeWidth: 5,
         });

         // Adding it to the canvas
         canvas.add(ellipse);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
</body>
</html>

Example 2

Passing lockSkewingY as a key with a value of "true"

In this example we We'll see how we can use the lockSkewingY property to stop the ability of an ellipse object to tilt vertically. While we can tilt an ellipse object horizontally, we are not allowed to do the same operation vertically. 

<!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>How to lock the vertical skewing of Ellipse using FabricJS?</h2>
      <p>Select the object and stretch it horizontally by pressing the <b>shift</b> key. The object will get skewed. But we have locked its vertical skewing by applying the <b>lockSkewingY</b> property. </p>
      <canvas id="canvas"></canvas>

      <script>
         // Initiate a canvas instance
         var canvas = new fabric.Canvas("canvas");

         // Initiate an ellipse instance
         var ellipse = new fabric.Ellipse({
            left: 115,
            top: 50,
            fill: "white",
            rx: 80,
            ry: 50,
            stroke: "black",
            strokeWidth: 5,
            lockSkewingY: true,
         });

         // Adding it to the canvas
         canvas.add(ellipse);
         canvas.setWidth(document.body.scrollWidth);
         canvas.setHeight(250);
      </script>
   </body>
</html>

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