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How to set the minimum allowed scale value of a Triangle using FabricJS?
<p>In this tutorial, we are going to learn how to set the minimum allowed scale of Triangle using FabricJS. Triangle is one of the various shapes provided by FabricJS. In order to create a triangle, we will have to create an instance of <em>fabric.Triangle</em> class and add it to the canvas.</p><p>We can customize a triangle object by adding a fill colour to it, eliminate its borders or even make changes in its dimensions. Similarly, we can also set its minimum allowed scale by using the <em>minScaleLimit</em> property.</p><h2>Syntax</h2><pre class="just-code notranslate language-javascript" data-lang="javascript">new fabric.Triangle({ minScaleLimit : Number }: Object)</pre><h2>Parameters</h2><ul class="list"><li><p><strong>Options</strong><strong> (optional)</strong> − This parameter is an <em>Object</em> which provides additional customizations to our triangle. Using this parameter colour, cursor, border width and a lot of other properties can be changed related to the object of which <em>minScaleLimit</em> is a property.</p></li></ul><h2>Options Keys</h2><ul class="list"><li><p><strong>minScaleLimit</strong> − This property accepts a <strong>Number</strong> as a value which allows us to control the minimum allowed scale value of a triangle.</p></li></ul><h2>Example 1</h2><p><strong>Default appearance of the Triangle object</strong></p><p>Let's see a code example to see how our triangle object looks like when the <em>minScaleLimit</em> property is not used. In this case, we will be able to freely scale our object since there is no minimum limit set.</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 appearance of the Triangle object</h2> <p>You can scale the triangle object to see that there is no minimum limit set</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 triangle object var triangle = new fabric.Triangle({ left: 105, top: 70, width: 90, height: 80, fill: "#746cc0", stroke: "#967bb6", strokeWidth: 5, }); // Add it to the canvas canvas.add(triangle); </script> </body> </html></pre><h2>Example 2</h2><p><strong>Passing the <em>minScaleLimit</em> property as key with a custom value</strong></p><p>In this example, we will see how assigning a value to the <em>minScaleLimit</em> property changes the minimum allowed scale value of the triangle object in our canvas. Here we have used 0.8 as value which means we will not be able to scale down our object lesser than a width of 72px and a height of 64px which is calculated by <strong>radius * limit</strong> (0.8 *90 = 72px, 0.8 * 80 = 64px).</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 the minScaleLimit property as key with a custom value</h2> <p>You can scale the triangle object to see that there is a minimum limit set</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 triangle object var triangle = new fabric.Triangle({ left: 105, top: 70, width: 90, height: 80, fill: "#746cc0", stroke: "#967bb6", strokeWidth: 5, minScaleLimit: 0.8, }); // Add it to the canvas canvas.add(triangle); </script> </body> </html></pre>
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