How to disable center scaling of triangles using FabricJS?-JS Tutorial-php.cn

How to disable center scaling of triangles using FabricJS?

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Release： 2023-09-15 15:33:08

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如何使用 FabricJS 禁用三角形的中心缩放？

In this tutorial, we will learn how to disable centered scaling of a triangle using FabricJS. Triangle is one of the various shapes provided by FabricJS. In order to create a triangle, we must create an instance of the Fabric.Triangle class and add it to the canvas.

When an object is scaled by a control, a true value of the centeredScaling property is assigned, and the origin of the transformation is its center.

Syntax

new fabric.Triangle({ centeredScaling: Boolean }: Object)

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Parameters

Options (optional) - This parameter is a Object< /em> Provides additional customization to our triangle. Using this parameter, you can change the color, cursor, stroke width and other properties of the object related to the centeredScaling property.

< /ul>
Option Key
centeredScaling - This property accepts a boolean value and allows us to control Whether the object should use its center as the transformation origin.
Example 1
Pass centeredScaling as key and assign it a "true" value
Let's look at a code Example of how a triangle object behaves when the centeredScaling property is enabled. When we zoom in on an object, the origin of the transformation is the center of the triangle.
<!DOCTYPE html> <html> <head>  <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script> </head> <body> <h2>Passing centeredScaling as key and assigning it a "true" value</h2> <p>Try scaling the triangle to see that it is using its center as the center of transformation.</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: 60, width: 100, height: 70, fill: "#5f9ea0", centeredScaling: true, }); // Add it to the canvas canvas.add(triangle); </script> </body> </html>
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Example 2
Disabling the centeredScaling property
We can disable the centeredScaling property by specifying a False value for it. This will no longer use the center of the triangle as the center of the transformation. Here is a code sample to demonstrate
<!DOCTYPE html> <html> <head>  <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script> </head> <body> <h2>Disabling the centeredScaling property</h2> <p>Try scaling the triangle to see that it is using one of its corners as the center of transformation.</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: 60, width: 100, height: 70, fill: "#5f9ea0", centeredScaling: false, }); // Add it to the canvas canvas.add(triangle); </script> </body> </html>
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