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How to lock the vertical skewing of Rectangle using FabricJS?
<p>In this tutorial, we are going to learn how to lock the vertical skewing of a Rectangle using FabricJS. Just as we can specify the position, colour, opacity and dimension of a rectangle object in the canvas, we can also specify whether we want to stop skewing an object vertically. This can be done by using the <em>lockSkewingY</em> property.</p><h2>Syntax</h2><pre class="result notranslate">new fabric.Rect({ lockSkewingY : Boolean }: Object)</pre><h2>Parameters</h2><ul class="list"><li><p><strong>Options (optional)</strong> − This parameter is an Object which provides additional customizations to our rectangle. Using this parameter, properties such as colour, cursor, stroke width, and a lot of other properties can be changed related to the object of which lockSkewingY is a property.</p></li></ul><h2>Options keys</h2><ul class="list"><li><p><strong>lockSkewingY</strong> − This property accepts a <strong>Boolean</strong> value. If we assign it a "True" value, then the object's vertical skewing will be locked.</p></li></ul><h2>Example 1</h2><p><strong>Default behaviour of a Rectangle object in the canvas</strong></p><p>Let’s see a code example to understand the default behaviour of a Rectangle object when lockSkewingY property is not used. Skewing the object in both horizontal and vertical directions is feasible by pressing the <strong>shift key</strong> and then dragging along the horizontal or vertical direction.</p><pre class="demo-code notranslate language-javascript" data-lang="javascript"><!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>Default behaviour of a Rectangle object in the canvas</h2> <p>Press the shift-key and drag the object along the X-axis or Y-axis to see that skewing is possible in both directions.</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: 155, top: 90, width: 170, height: 70, fill: "#6f2da8", padding: 9, stroke: "#b666d2", strokeWidth: 5, }); // Add it to the canvas canvas.add(rect); </script> </body> </html></pre><h2>Example</h2><p><strong>Passing lockSkewingY as key with ‘true’ value</strong></p><p>In this example, we will see how we can cease the ability of a rectangle object to skew vertically using the <em>lockSkewingY</em> property. As we can see, although we can skew the rectangle object horizontally, we are not allowed to perform the same action vertically.</p><pre class="demo-code notranslate language-javascript" data-lang="javascript"><!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 lockSkewingY as key with a "True" value</h2> <p>You can see that skewing along the Y-axis is no longer feasible.</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: 155, top: 90, width: 170, height: 70, fill: "#6f2da8", padding: 9, stroke: "#b666d2", strokeWidth: 5, lockSkewingY: true, }); // Add it to the canvas canvas.add(rect); </script> </body> </html></pre>
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